rust/configure

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#!/bin/sh
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msg() {
echo "configure: $1"
}
step_msg() {
msg
msg "$1"
msg
}
warn() {
echo "configure: WARNING: $1"
}
err() {
echo "configure: error: $1"
exit 1
}
need_ok() {
if [ $? -ne 0 ]
then
err "$1"
fi
}
need_cmd() {
if command -v $1 >/dev/null 2>&1
then msg "found program $1"
else err "need program $1"
fi
}
make_dir() {
if [ ! -d $1 ]
then
msg "mkdir -p $1"
mkdir -p $1
fi
}
copy_if_changed() {
if cmp -s $1 $2
then
msg "leaving $2 unchanged"
else
msg "cp $1 $2"
cp -f $1 $2
chmod u-w $2 # make copied artifact read-only
fi
}
move_if_changed() {
if cmp -s $1 $2
then
msg "leaving $2 unchanged"
else
msg "mv $1 $2"
mv -f $1 $2
chmod u-w $2 # make moved artifact read-only
fi
}
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putvar() {
local T
eval T=\$$1
eval TLEN=\${#$1}
if [ $TLEN -gt 35 ]
then
printf "configure: %-20s := %.35s ...\n" $1 "$T"
else
printf "configure: %-20s := %s %s\n" $1 "$T" "$2"
fi
printf "%-20s := %s\n" $1 "$T" >>config.tmp
}
putpathvar() {
local T
eval T=\$$1
eval TLEN=\${#$1}
if [ $TLEN -gt 35 ]
then
printf "configure: %-20s := %.35s ...\n" $1 "$T"
else
printf "configure: %-20s := %s %s\n" $1 "$T" "$2"
fi
if [ -z "$T" ]
then
printf "%-20s := \n" $1 >>config.tmp
else
printf "%-20s := \"%s\"\n" $1 "$T" >>config.tmp
fi
}
probe() {
local V=$1
shift
local P
local T
for P
do
T=$(command -v $P 2>&1)
if [ $? -eq 0 ]
then
VER0=$($P --version 2>/dev/null | head -1 \
| sed -e 's/[^0-9]*\([vV]\?[0-9.]\+[^ ]*\).*/\1/' )
if [ $? -eq 0 -a "x${VER0}" != "x" ]
then
VER="($VER0)"
else
VER=""
fi
break
else
VER=""
T=""
fi
done
eval $V=\$T
putpathvar $V "$VER"
}
probe_need() {
local V=$1
probe $*
eval VV=\$$V
if [ -z "$VV" ]
then
err "needed, but unable to find any of: $*"
fi
}
validate_opt () {
for arg in $CFG_CONFIGURE_ARGS
do
isArgValid=0
for option in $BOOL_OPTIONS
do
if test --disable-$option = $arg
then
isArgValid=1
fi
if test --enable-$option = $arg
then
isArgValid=1
fi
done
for option in $VAL_OPTIONS
do
if echo "$arg" | grep -q -- "--$option="
then
isArgValid=1
fi
done
if [ "$arg" = "--help" ]
then
echo
echo "No more help available for Configure options,"
echo "check the Wiki or join our IRC channel"
break
else
if test $isArgValid -eq 0
then
err "Option '$arg' is not recognized"
fi
fi
done
}
# `valopt OPTION_NAME DEFAULT DOC` extracts a string-valued option
# from command line, using provided default value for the option if
# not present, and saves it to the generated config.mk.
#
# `valopt_nosave` is much the same, except that it does not save the
# result to config.mk (instead the script should use `putvar` itself
# later on to save it). `valopt_core` is the core upon which the
# other two are built.
valopt_core() {
VAL_OPTIONS="$VAL_OPTIONS $2"
local SAVE=$1
local OP=$2
local DEFAULT=$3
shift
shift
shift
local DOC="$*"
if [ $HELP -eq 0 ]
then
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local UOP=$(echo $OP | tr '[:lower:]' '[:upper:]' | tr '\-' '\_')
local V="CFG_${UOP}"
local V_PROVIDED="${V}_PROVIDED"
eval $V="$DEFAULT"
for arg in $CFG_CONFIGURE_ARGS
do
if echo "$arg" | grep -q -- "--$OP="
then
val=$(echo "$arg" | cut -f2 -d=)
eval $V=$val
eval $V_PROVIDED=1
fi
done
if [ "$SAVE" = "save" ]
then
putvar $V
fi
else
if [ -z "$DEFAULT" ]
then
DEFAULT="<none>"
fi
OP="${OP}=[${DEFAULT}]"
printf " --%-30s %s\n" "$OP" "$DOC"
fi
}
valopt_nosave() {
valopt_core nosave "$@"
}
valopt() {
valopt_core save "$@"
}
# `opt OPTION_NAME DEFAULT DOC` extracts a boolean-valued option from
# command line, using the provided default value (0/1) for the option
# if not present, and saves it to the generated config.mk.
#
# `opt_nosave` is much the same, except that it does not save the
# result to config.mk (instead the script should use `putvar` itself
# later on to save it). `opt_core` is the core upon which the other
# two are built.
opt_core() {
BOOL_OPTIONS="$BOOL_OPTIONS $2"
local SAVE=$1
local OP=$2
local DEFAULT=$3
shift
shift
shift
local DOC="$*"
local FLAG=""
if [ $DEFAULT -eq 0 ]
then
FLAG="enable"
DEFAULT_FLAG="disable"
else
FLAG="disable"
DEFAULT_FLAG="enable"
DOC="don't $DOC"
fi
if [ $HELP -eq 0 ]
then
for arg in $CFG_CONFIGURE_ARGS
do
if [ "$arg" = "--${FLAG}-${OP}" ]
then
OP=$(echo $OP | tr 'a-z-' 'A-Z_')
FLAG=$(echo $FLAG | tr 'a-z' 'A-Z')
local V="CFG_${FLAG}_${OP}"
local V_PROVIDED="CFG_${FLAG}_${OP}_PROVIDED"
eval $V=1
eval $V_PROVIDED=1
if [ "$SAVE" = "save" ]
then
putvar $V
fi
elif [ "$arg" = "--${DEFAULT_FLAG}-${OP}" ]
then
OP=$(echo $OP | tr 'a-z-' 'A-Z_')
DEFAULT_FLAG=$(echo $DEFAULT_FLAG | tr 'a-z' 'A-Z')
local V_PROVIDED="CFG_${DEFAULT_FLAG}_${OP}_PROVIDED"
eval $V_PROVIDED=1
fi
done
else
if [ ! -z "$META" ]
then
OP="$OP=<$META>"
fi
printf " --%-30s %s\n" "$FLAG-$OP" "$DOC"
fi
}
opt_nosave() {
opt_core nosave "$@"
}
opt() {
opt_core save "$@"
}
Make configure respect (and save) values for `CC`, `CXX`, `CFLAGS`, etc. I mostly tried to remain backwards compatible with old invocations of the `configure` script; if you do not want to use `CC` et al., you should not have to; you can keep using `--enable-clang` and/or `--enable-ccache`. The overall intention is to capture the following precedences for guessing the C compiler: 1. Value of `CC` at make invocation time. 2. Value of `CC` at configure invocation time. 3. Compiler inferred at configure invocation time (`gcc` or `clang`). The strategy is to check (at `configure` time) if each of the environment variables is set, and if so, save its value in a corresponding `CFG_` variable (e.g. `CFG_CC`). Then, in the makefiles, if `CC` is not set but `CFG_CC` is, then we use the `CFG_CC` setting as `CC`. Also, I fold the potential user-provided `CFLAGS` and `CXXFLAGS` values into all of the per-platform `CFLAGS` and `CXXFLAGS` settings. (This was opposed to adding `$(CFLAGS)` in an ad-hoc manner to various parts of the mk files.) Fix #13805. ---- Note that if you try to set the compiler to clang via the `CC` and `CXX` environment variables, you will probably need to also set `CXXFLAGS` to `--enable-libcpp` so that LLVM will be configured properly. ---- Introduce CFG_USING_CLANG, which is distinguished from CFG_ENABLE_CLANG because the former represents "we think we're using clang, choose appropriate warning-control options" while the latter represents "we asked configure (or the host required) that we attempt to use clang, so check that we have an appropriate version of clang." The main reason I added this is that I wanted to allow the user to choose clang via setting the `CC` environment variable, but I did not want that method of selection to get confused with the user passing the `--enable-clang` option. ---- A digression: The `configure` script does not infer the compiler setting if `CC` is set; but if `--enable-clang` was passed, then it *does* still attempt to validate that the clang version is compatible. Supporting this required revising `CLANG_VERSION` check to be robust in face of user-provided `CC` value. In particular, on Travis, the `CC` is set to `gcc` and so the natural thing to do is to attempt to use `gcc` as the compiler, but Travis is also passing `--enable-clang` to configure. So, what is the right answer in the face of these contradictory requests? One approach would be to have `--enable-clang` supersede the setting for `CC` (and instead just call whatever we inferred for `CFG_CLANG`). That sounds maximally inflexible to me (pnkfelix): a developer requesting a `CC` value probably wants it respected, and should be able to set it to something else; it is harder for that developer to hack our configure script to change its inferred path to clang. A second approach would be to blindly use the `CC` value but keep going through the clang version check when `--enable-clang` is turned on. But on Travis (a Linux host), the `gcc` invocation won't print a clang version, so we would not get past the CLANG_VERSION check in that context. A third approach would be to never run the CLANG_VERSION check if `CC` is explicitly set. That is not a terrible idea; but if the user uses `CC` to pass in a path to some other version of clang that they want to test, probably should still send that through the `CLANG_VERSION` check. So in the end I (pnkfelix) took a fourth approach: do the CLANG_VERSION check if `CC` is unset *or* if `CC` is set to a string ending with `clang`. This way setting `CC` to things like `path/to/clang` or `ccache clang` will still go through the CLANG_VERSION check, while setting `CC` to `gcc` or some unknown compiler will skip the CLANG_VERSION check (regardless of whether the user passed --enable-clang to `configure`). ---- Drive-by fixes: * The call that sets `CFG_CLANG_VERSION` was quoting `"$CFG_CC"` in its invocation, but that does not play nicely with someone who sets `$CFG_CC` to e.g. `ccache clang`, since you do not want to intepret that whole string as a command. (On the other hand, a path with spaces might need the quoted invocation. Not sure which one of these corner use-cases is more important to support.) * Fix chk_cc error message to point user at `gcc` not `cc`.
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envopt() {
local NAME=$1
local V="CFG_${NAME}"
eval VV=\$$V
# If configure didn't set a value already, then check environment.
#
# (It is recommended that the configure script always check the
# environment before setting any values to envopt variables; see
# e.g. how CFG_CC is handled, where it first checks `-z "$CC"`,
# and issues msg if it ends up employing that provided value.)
if [ -z "$VV" ]
then
eval $V=\$$NAME
eval VV=\$$V
fi
# If script or environment provided a value, save it.
if [ ! -z "$VV" ]
then
putvar $V
fi
}
to_llvm_triple() {
case $1 in
i686-w64-mingw32) echo i686-pc-windows-gnu ;;
x86_64-w64-mingw32) echo x86_64-pc-windows-gnu ;;
*) echo $1 ;;
esac
}
to_gnu_triple() {
case $1 in
i686-pc-windows-gnu) echo i686-w64-mingw32 ;;
x86_64-pc-windows-gnu) echo x86_64-w64-mingw32 ;;
*) echo $1 ;;
esac
}
msg "looking for configure programs"
need_cmd cmp
need_cmd mkdir
need_cmd printf
need_cmd cut
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need_cmd head
need_cmd grep
need_cmd xargs
need_cmd cp
need_cmd find
need_cmd uname
need_cmd date
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need_cmd tr
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need_cmd sed
need_cmd file
need_cmd make
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msg "inspecting environment"
CFG_OSTYPE=$(uname -s)
CFG_CPUTYPE=$(uname -m)
if [ $CFG_OSTYPE = Darwin -a $CFG_CPUTYPE = i386 ]
then
# Darwin's `uname -s` lies and always returns i386. We have to use sysctl
# instead.
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if sysctl hw.optional.x86_64 | grep -q ': 1'
then
CFG_CPUTYPE=x86_64
fi
fi
# The goal here is to come up with the same triple as LLVM would,
# at least for the subset of platforms we're willing to target.
case $CFG_OSTYPE in
Linux)
CFG_OSTYPE=unknown-linux-gnu
;;
FreeBSD)
CFG_OSTYPE=unknown-freebsd
;;
DragonFly)
CFG_OSTYPE=unknown-dragonfly
;;
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Bitrig)
CFG_OSTYPE=unknown-bitrig
;;
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OpenBSD)
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CFG_OSTYPE=unknown-openbsd
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;;
Darwin)
CFG_OSTYPE=apple-darwin
;;
MINGW*)
# msys' `uname` does not print gcc configuration, but prints msys
# configuration. so we cannot believe `uname -m`:
# msys1 is always i686 and msys2 is always x86_64.
# instead, msys defines $MSYSTEM which is MINGW32 on i686 and
# MINGW64 on x86_64.
CFG_CPUTYPE=i686
CFG_OSTYPE=pc-windows-gnu
if [ "$MSYSTEM" = MINGW64 ]
then
CFG_CPUTYPE=x86_64
fi
;;
MSYS*)
CFG_OSTYPE=pc-windows-gnu
;;
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# Thad's Cygwin identifiers below
# Vista 32 bit
CYGWIN_NT-6.0)
CFG_OSTYPE=pc-windows-gnu
CFG_CPUTYPE=i686
;;
# Vista 64 bit
CYGWIN_NT-6.0-WOW64)
CFG_OSTYPE=pc-windows-gnu
CFG_CPUTYPE=x86_64
;;
# Win 7 32 bit
CYGWIN_NT-6.1)
CFG_OSTYPE=pc-windows-gnu
CFG_CPUTYPE=i686
;;
# Win 7 64 bit
CYGWIN_NT-6.1-WOW64)
CFG_OSTYPE=pc-windows-gnu
CFG_CPUTYPE=x86_64
;;
# Win 8 # uname -s on 64-bit cygwin does not contain WOW64, so simply use uname -m to detect arch (works in my install)
CYGWIN_NT-6.3)
CFG_OSTYPE=pc-windows-gnu
;;
# We do not detect other OS such as XP/2003 using 64 bit using uname.
# If we want to in the future, we will need to use Cygwin - Chuck's csih helper in /usr/lib/csih/winProductName.exe or alternative.
*)
err "unknown OS type: $CFG_OSTYPE"
;;
esac
case $CFG_CPUTYPE in
i386 | i486 | i686 | i786 | x86)
CFG_CPUTYPE=i686
;;
xscale | arm)
CFG_CPUTYPE=arm
;;
armv7l)
CFG_CPUTYPE=arm
CFG_OSTYPE="${CFG_OSTYPE}eabihf"
;;
aarch64)
CFG_CPUTYPE=aarch64
;;
# At some point, when ppc64[le] support happens, this will need to do
# something clever. For now it's safe to assume that we're only ever
# interested in building 32 bit.
powerpc | ppc | ppc64)
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CFG_CPUTYPE=powerpc
;;
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x86_64 | x86-64 | x64 | amd64)
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CFG_CPUTYPE=x86_64
;;
*)
err "unknown CPU type: $CFG_CPUTYPE"
esac
# Detect 64 bit linux systems with 32 bit userland and force 32 bit compilation
if [ $CFG_OSTYPE = unknown-linux-gnu -a $CFG_CPUTYPE = x86_64 ]
then
# $SHELL does not exist in standard 'sh', so probably only exists
# if configure is running in an interactive bash shell. /usr/bin/env
# exists *everywhere*.
BIN_TO_PROBE="$SHELL"
if [ -z "$BIN_TO_PROBE" -a -e "/usr/bin/env" ]; then
BIN_TO_PROBE="/usr/bin/env"
fi
if [ -n "$BIN_TO_PROBE" ]; then
file -L "$BIN_TO_PROBE" | grep -q "x86[_-]64"
if [ $? != 0 ]; then
CFG_CPUTYPE=i686
fi
fi
fi
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DEFAULT_BUILD="${CFG_CPUTYPE}-${CFG_OSTYPE}"
CFG_SRC_DIR="$(cd $(dirname $0) && pwd)/"
CFG_BUILD_DIR="$(pwd)/"
CFG_SELF="$0"
CFG_CONFIGURE_ARGS="$@"
OPTIONS=""
HELP=0
if [ "$1" = "--help" ]
then
HELP=1
shift
echo
echo "Usage: $CFG_SELF [options]"
echo
echo "Options:"
echo
else
msg "recreating config.tmp"
echo '' >config.tmp
step_msg "processing $CFG_SELF args"
fi
BOOL_OPTIONS=""
VAL_OPTIONS=""
opt debug 0 "debug mode"
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opt valgrind 0 "run tests with valgrind (memcheck by default)"
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opt helgrind 0 "run tests with helgrind instead of memcheck"
opt valgrind-rpass 1 "run rpass-valgrind tests with valgrind"
opt docs 1 "build standard library documentation"
opt compiler-docs 0 "build compiler documentation"
opt optimize-tests 1 "build tests with optimizations"
opt libcpp 1 "build with llvm with libc++ instead of libstdc++ when using clang"
opt llvm-assertions 0 "build LLVM with assertions"
opt debug-assertions 0 "build with debugging assertions"
opt fast-make 0 "use .gitmodules as timestamp for submodule deps"
opt ccache 0 "invoke gcc/clang via ccache to reuse object files between builds"
opt local-rust 0 "use an installed rustc rather than downloading a snapshot"
opt llvm-static-stdcpp 0 "statically link to libstdc++ for LLVM"
opt rpath 0 "build rpaths into rustc itself"
# This is used by the automation to produce single-target nightlies
opt dist-host-only 0 "only install bins for the host architecture"
opt inject-std-version 1 "inject the current compiler version of libstd into programs"
opt llvm-version-check 1 "don't check if the LLVM version is supported, build anyway"
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# Optimization and debugging options. These may be overridden by the release channel, etc.
opt_nosave optimize 1 "build optimized rust code"
opt_nosave optimize-cxx 1 "build optimized C++ code"
opt_nosave optimize-llvm 1 "build optimized LLVM"
opt_nosave llvm-assertions 0 "build LLVM with assertions"
opt_nosave debug-assertions 0 "build with debugging assertions"
opt_nosave debuginfo 0 "build with debugger metadata"
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opt_nosave debug-jemalloc 0 "build jemalloc with --enable-debug --enable-fill"
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valopt localstatedir "/var/lib" "local state directory"
valopt sysconfdir "/etc" "install system configuration files"
valopt datadir "${CFG_PREFIX}/share" "install data"
valopt infodir "${CFG_PREFIX}/share/info" "install additional info"
valopt llvm-root "" "set LLVM root"
valopt jemalloc-root "" "set directory where libjemalloc_pic.a is located"
valopt build "${DEFAULT_BUILD}" "GNUs ./configure syntax LLVM build triple"
valopt android-cross-path "/opt/ndk_standalone" "Android NDK standalone path"
valopt release-channel "dev" "the name of the release channel to build"
# Many of these are saved below during the "writing configuration" step
# (others are conditionally saved).
opt_nosave manage-submodules 1 "let the build manage the git submodules"
opt_nosave clang 0 "prefer clang to gcc for building the runtime"
opt_nosave jemalloc 1 "build liballoc with jemalloc"
valopt_nosave prefix "/usr/local" "set installation prefix"
valopt_nosave local-rust-root "/usr/local" "set prefix for local rust binary"
valopt_nosave host "${CFG_BUILD}" "GNUs ./configure syntax LLVM host triples"
valopt_nosave target "${CFG_HOST}" "GNUs ./configure syntax LLVM target triples"
valopt_nosave mandir "${CFG_PREFIX}/share/man" "install man pages in PATH"
# Temporarily support old triples until buildbots get updated
CFG_BUILD=$(to_llvm_triple $CFG_BUILD)
putvar CFG_BUILD # Yes, this creates a duplicate entry, but the last one wins.
CFG_HOST=$(to_llvm_triple $CFG_HOST)
CFG_TARGET=$(to_llvm_triple $CFG_TARGET)
# On windows we just store the libraries in the bin directory because
# there's no rpath. This is where the build system itself puts libraries;
# --libdir is used to configure the installation directory.
# FIXME: This needs to parameterized over target triples. Do it in platform.mk
if [ "$CFG_OSTYPE" = "pc-windows-gnu" ]
then
CFG_LIBDIR_RELATIVE=bin
else
CFG_LIBDIR_RELATIVE=lib
fi
valopt libdir "${CFG_PREFIX}/${CFG_LIBDIR_RELATIVE}" "install libraries (do not set it on windows platform)"
case "$CFG_LIBDIR" in
"$CFG_PREFIX"/*) CAT_INC=2;;
"$CFG_PREFIX"*) CAT_INC=1;;
*)
err "libdir must begin with the prefix. Use --prefix to set it accordingly.";;
esac
CFG_LIBDIR_RELATIVE=`echo ${CFG_LIBDIR} | cut -c$((${#CFG_PREFIX}+${CAT_INC}))-`
if [ "$CFG_OSTYPE" = "pc-windows-gnu" ] && [ "$CFG_LIBDIR_RELATIVE" != "bin" ]; then
err "libdir on windows should be set to 'bin'"
fi
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if [ $HELP -eq 1 ]
then
echo
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exit 0
fi
# Validate Options
step_msg "validating $CFG_SELF args"
validate_opt
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# Validate the release channel, and configure options
case "$CFG_RELEASE_CHANNEL" in
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nightly )
msg "overriding settings for $CFG_RELEASE_CHANNEL"
CFG_ENABLE_LLVM_ASSERTIONS=1
;;
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dev | beta | stable)
;;
*)
err "release channel must be 'dev', 'nightly', 'beta' or 'stable'"
;;
esac
# Adjust perf and debug options for debug mode
if [ -n "$CFG_ENABLE_DEBUG" ]; then
msg "debug mode enabled, setting performance options"
if [ -z "$CFG_ENABLE_OPTIMIZE_PROVIDED" ]; then
msg "optimization not explicitly enabled, disabling optimization"
CFG_DISABLE_OPTIMIZE=1
CFG_DISABLE_OPTIMIZE_CXX=1
fi
CFG_ENABLE_LLVM_ASSERTIONS=1
CFG_ENABLE_DEBUG_ASSERTIONS=1
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CFG_ENABLE_DEBUG_JEMALLOC=1
fi
# OK, now write the debugging options
if [ -n "$CFG_DISABLE_OPTIMIZE" ]; then putvar CFG_DISABLE_OPTIMIZE; fi
if [ -n "$CFG_DISABLE_OPTIMIZE_CXX" ]; then putvar CFG_DISABLE_OPTIMIZE_CXX; fi
if [ -n "$CFG_DISABLE_OPTIMIZE_LLVM" ]; then putvar CFG_DISABLE_OPTIMIZE_LLVM; fi
if [ -n "$CFG_ENABLE_LLVM_ASSERTIONS" ]; then putvar CFG_ENABLE_LLVM_ASSERTIONS; fi
if [ -n "$CFG_ENABLE_DEBUG_ASSERTIONS" ]; then putvar CFG_ENABLE_DEBUG_ASSERTIONS; fi
if [ -n "$CFG_ENABLE_DEBUGINFO" ]; then putvar CFG_ENABLE_DEBUGINFO; fi
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if [ -n "$CFG_ENABLE_DEBUG_JEMALLOC" ]; then putvar CFG_ENABLE_DEBUG_JEMALLOC; fi
Preliminary feature staging This partially implements the feature staging described in the [release channel RFC][rc]. It does not yet fully conform to the RFC as written, but does accomplish its goals sufficiently for the 1.0 alpha release. It has three primary user-visible effects: * On the nightly channel, use of unstable APIs generates a warning. * On the beta channel, use of unstable APIs generates a warning. * On the beta channel, use of feature gates generates a warning. Code that does not trigger these warnings is considered 'stable', modulo pre-1.0 bugs. Disabling the warnings for unstable APIs continues to be done in the existing (i.e. old) style, via `#[allow(...)]`, not that specified in the RFC. I deem this marginally acceptable since any code that must do this is not using the stable dialect of Rust. Use of feature gates is itself gated with the new 'unstable_features' lint, on nightly set to 'allow', and on beta 'warn'. The attribute scheme used here corresponds to an older version of the RFC, with the `#[staged_api]` crate attribute toggling the staging behavior of the stability attributes, but the user impact is only in-tree so I'm not concerned about having to make design changes later (and I may ultimately prefer the scheme here after all, with the `#[staged_api]` crate attribute). Since the Rust codebase itself makes use of unstable features the compiler and build system to a midly elaborate dance to allow it to bootstrap while disobeying these lints (which would otherwise be errors because Rust builds with `-D warnings`). This patch includes one significant hack that causes a regression. Because the `format_args!` macro emits calls to unstable APIs it would trigger the lint. I added a hack to the lint to make it not trigger, but this in turn causes arguments to `println!` not to be checked for feature gates. I don't presently understand macro expansion well enough to fix. This is bug #20661. Closes #16678 [rc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
2015-01-06 15:26:08 +01:00
# A magic value that allows the compiler to use unstable features
# during the bootstrap even when doing so would normally be an error
# because of feature staging or because the build turns on
# warnings-as-errors and unstable features default to warnings. The
# build has to match this key in an env var. Meant to be a mild
# deterrent from users just turning on unstable features on the stable
# channel.
# Basing CFG_BOOTSTRAP_KEY on CFG_BOOTSTRAP_KEY lets it get picked up
# during a Makefile reconfig.
CFG_BOOTSTRAP_KEY="${CFG_BOOTSTRAP_KEY-`date +%H:%M:%S`}"
Preliminary feature staging This partially implements the feature staging described in the [release channel RFC][rc]. It does not yet fully conform to the RFC as written, but does accomplish its goals sufficiently for the 1.0 alpha release. It has three primary user-visible effects: * On the nightly channel, use of unstable APIs generates a warning. * On the beta channel, use of unstable APIs generates a warning. * On the beta channel, use of feature gates generates a warning. Code that does not trigger these warnings is considered 'stable', modulo pre-1.0 bugs. Disabling the warnings for unstable APIs continues to be done in the existing (i.e. old) style, via `#[allow(...)]`, not that specified in the RFC. I deem this marginally acceptable since any code that must do this is not using the stable dialect of Rust. Use of feature gates is itself gated with the new 'unstable_features' lint, on nightly set to 'allow', and on beta 'warn'. The attribute scheme used here corresponds to an older version of the RFC, with the `#[staged_api]` crate attribute toggling the staging behavior of the stability attributes, but the user impact is only in-tree so I'm not concerned about having to make design changes later (and I may ultimately prefer the scheme here after all, with the `#[staged_api]` crate attribute). Since the Rust codebase itself makes use of unstable features the compiler and build system to a midly elaborate dance to allow it to bootstrap while disobeying these lints (which would otherwise be errors because Rust builds with `-D warnings`). This patch includes one significant hack that causes a regression. Because the `format_args!` macro emits calls to unstable APIs it would trigger the lint. I added a hack to the lint to make it not trigger, but this in turn causes arguments to `println!` not to be checked for feature gates. I don't presently understand macro expansion well enough to fix. This is bug #20661. Closes #16678 [rc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
2015-01-06 15:26:08 +01:00
putvar CFG_BOOTSTRAP_KEY
step_msg "looking for build programs"
2011-11-03 22:13:22 +01:00
probe_need CFG_CURLORWGET curl wget
probe_need CFG_PYTHON python2.7 python2.6 python2 python
python_version=$($CFG_PYTHON -V 2>&1)
if [ $(echo $python_version | grep -c '^Python 2\.[4567]') -ne 1 ]; then
err "Found $python_version, but LLVM requires Python 2.4-2.7"
fi
# If we have no git directory then we are probably a tarball distribution
# and shouldn't attempt to load submodules
if [ ! -e ${CFG_SRC_DIR}.git ]
then
2012-02-29 20:48:29 +01:00
probe CFG_GIT git
msg "git: no git directory. disabling submodules"
CFG_DISABLE_MANAGE_SUBMODULES=1
else
2012-02-29 20:48:29 +01:00
probe_need CFG_GIT git
fi
probe CFG_CLANG clang++
probe CFG_CCACHE ccache
probe CFG_GCC gcc
probe CFG_LD ld
probe CFG_VALGRIND valgrind
probe CFG_PERF perf
probe CFG_ISCC iscc
2014-07-15 09:18:17 +02:00
probe CFG_ANTLR4 antlr4
probe CFG_GRUN grun
probe CFG_FLEX flex
probe CFG_BISON bison
probe CFG_PANDOC pandoc
probe CFG_XELATEX xelatex
probe CFG_GDB gdb
probe CFG_LLDB lldb
# On MacOS X, invoking `javac` pops up a dialog if the JDK is not
# installed. Since `javac` is only used if `antlr4` is available,
# probe for it only in this case.
if [ ! -z "$CFG_ANTLR4" ]
then
probe CFG_JAVAC javac
fi
if [ ! -z "$CFG_GDB" ]
then
# Store GDB's version
CFG_GDB_VERSION=$($CFG_GDB --version 2>/dev/null | head -1)
putvar CFG_GDB_VERSION
fi
if [ ! -z "$CFG_LLDB" ]
then
# Store LLDB's version
CFG_LLDB_VERSION=$($CFG_LLDB --version 2>/dev/null | head -1)
putvar CFG_LLDB_VERSION
# If CFG_LLDB_PYTHON_DIR is not already set from the outside and valid, try to read it from
# LLDB via the -P commandline options.
if [ -z "$CFG_LLDB_PYTHON_DIR" ] || [ ! -d "$CFG_LLDB_PYTHON_DIR" ]
then
CFG_LLDB_PYTHON_DIR=$($CFG_LLDB -P)
# If CFG_LLDB_PYTHON_DIR is not a valid directory, set it to something more readable
if [ ! -d "$CFG_LLDB_PYTHON_DIR" ]
then
CFG_LLDB_PYTHON_DIR="LLDB_PYTHON_DIRECTORY_NOT_FOUND"
fi
putvar CFG_LLDB_PYTHON_DIR
fi
fi
2013-05-03 17:46:52 +02:00
step_msg "looking for target specific programs"
probe CFG_ADB adb
if [ ! -z "$CFG_PANDOC" ]
then
# Extract "MAJOR MINOR" from Pandoc's version number
PV_MAJOR_MINOR=$(pandoc --version | grep '^pandoc' |
sed -E 's/pandoc(.exe)? ([0-9]+)\.([0-9]+).*/\2 \3/')
MIN_PV_MAJOR="1"
MIN_PV_MINOR="9"
# these patterns are shell globs, *not* regexps
PV_MAJOR=${PV_MAJOR_MINOR% *}
PV_MINOR=${PV_MAJOR_MINOR#* }
if [ "$PV_MAJOR" -lt "$MIN_PV_MAJOR" ] || [ "$PV_MINOR" -lt "$MIN_PV_MINOR" ]
then
2013-12-13 17:33:50 +01:00
step_msg "pandoc $PV_MAJOR.$PV_MINOR is too old. Need at least $MIN_PV_MAJOR.$MIN_PV_MINOR. Disabling"
BAD_PANDOC=1
fi
fi
BIN_SUF=
if [ "$CFG_OSTYPE" = "pc-windows-gnu" ]
then
BIN_SUF=.exe
fi
if [ ! -z "$CFG_ENABLE_LOCAL_RUST" ]
then
system_rustc=$(which rustc)
if [ -f ${CFG_LOCAL_RUST_ROOT}/bin/rustc${BIN_SUF} ]
then
: # everything already configured
elif [ -n "$system_rustc" ]
then
# we assume that rustc is in a /bin directory
CFG_LOCAL_RUST_ROOT=${system_rustc%/bin/rustc}
else
err "no local rust to use"
fi
CMD="${CFG_LOCAL_RUST_ROOT}/bin/rustc${BIN_SUF}"
LRV=`$CMD --version`
if [ $? -ne 0 ]
then
step_msg "failure while running $CMD --version"
exit 1
fi
step_msg "using rustc at: ${CFG_LOCAL_RUST_ROOT} with version: $LRV"
putvar CFG_LOCAL_RUST_ROOT
fi
# Force freebsd to build with clang; gcc doesn't like us there
if [ $CFG_OSTYPE = unknown-freebsd ]
then
step_msg "on FreeBSD, forcing use of clang"
CFG_ENABLE_CLANG=1
fi
2015-01-17 08:51:04 +01:00
# Force bitrig to build with clang; gcc doesn't like us there
if [ $CFG_OSTYPE = unknown-bitrig ]
then
2015-03-10 18:20:05 +01:00
step_msg "on Bitrig, forcing use of clang, disabling jemalloc"
2015-01-17 08:51:04 +01:00
CFG_ENABLE_CLANG=1
CFG_DISABLE_JEMALLOC=1
2015-01-17 08:51:04 +01:00
fi
if [ -z "$CFG_ENABLE_CLANG" -a -z "$CFG_GCC" ]
then
err "either clang or gcc is required"
fi
# OS X 10.9, gcc is actually clang. This can cause some confusion in the build
# system, so if we find that gcc is clang, we should just use clang directly.
if [ $CFG_OSTYPE = apple-darwin -a -z "$CFG_ENABLE_CLANG" ]
then
CFG_OSX_GCC_VERSION=$("$CFG_GCC" --version 2>&1 | grep "Apple LLVM version")
if [ $? -eq 0 ]
then
step_msg "on OS X 10.9, forcing use of clang"
CFG_ENABLE_CLANG=1
2014-01-07 17:45:41 +01:00
else
if [ $("$CFG_GCC" --version 2>&1 | grep -c ' 4\.[0-6]') -ne 0 ]; then
step_msg "older GCC found, using clang instead"
CFG_ENABLE_CLANG=1
else
# on OS X, with xcode 5 and newer, certain developers may have
# cc, gcc and g++ point to a mixture of clang and gcc
# if so, this will create very strange build errors
# this last stanza is to detect some such problems and save the future rust
# contributor some time solving that issue.
# this detection could be generalized to other OSes aside from OS X
# but the issue seems most likely to happen on OS X
chk_cc () {
$1 --version 2> /dev/null | grep -q $2
}
# check that gcc, cc and g++ all point to the same compiler.
# note that for xcode 5, g++ points to clang, not clang++
if !((chk_cc gcc clang && chk_cc g++ clang) ||
(chk_cc gcc gcc &&( chk_cc g++ g++ || chk g++ gcc))); then
err "the gcc and g++ in your path point to different compilers.
Make configure respect (and save) values for `CC`, `CXX`, `CFLAGS`, etc. I mostly tried to remain backwards compatible with old invocations of the `configure` script; if you do not want to use `CC` et al., you should not have to; you can keep using `--enable-clang` and/or `--enable-ccache`. The overall intention is to capture the following precedences for guessing the C compiler: 1. Value of `CC` at make invocation time. 2. Value of `CC` at configure invocation time. 3. Compiler inferred at configure invocation time (`gcc` or `clang`). The strategy is to check (at `configure` time) if each of the environment variables is set, and if so, save its value in a corresponding `CFG_` variable (e.g. `CFG_CC`). Then, in the makefiles, if `CC` is not set but `CFG_CC` is, then we use the `CFG_CC` setting as `CC`. Also, I fold the potential user-provided `CFLAGS` and `CXXFLAGS` values into all of the per-platform `CFLAGS` and `CXXFLAGS` settings. (This was opposed to adding `$(CFLAGS)` in an ad-hoc manner to various parts of the mk files.) Fix #13805. ---- Note that if you try to set the compiler to clang via the `CC` and `CXX` environment variables, you will probably need to also set `CXXFLAGS` to `--enable-libcpp` so that LLVM will be configured properly. ---- Introduce CFG_USING_CLANG, which is distinguished from CFG_ENABLE_CLANG because the former represents "we think we're using clang, choose appropriate warning-control options" while the latter represents "we asked configure (or the host required) that we attempt to use clang, so check that we have an appropriate version of clang." The main reason I added this is that I wanted to allow the user to choose clang via setting the `CC` environment variable, but I did not want that method of selection to get confused with the user passing the `--enable-clang` option. ---- A digression: The `configure` script does not infer the compiler setting if `CC` is set; but if `--enable-clang` was passed, then it *does* still attempt to validate that the clang version is compatible. Supporting this required revising `CLANG_VERSION` check to be robust in face of user-provided `CC` value. In particular, on Travis, the `CC` is set to `gcc` and so the natural thing to do is to attempt to use `gcc` as the compiler, but Travis is also passing `--enable-clang` to configure. So, what is the right answer in the face of these contradictory requests? One approach would be to have `--enable-clang` supersede the setting for `CC` (and instead just call whatever we inferred for `CFG_CLANG`). That sounds maximally inflexible to me (pnkfelix): a developer requesting a `CC` value probably wants it respected, and should be able to set it to something else; it is harder for that developer to hack our configure script to change its inferred path to clang. A second approach would be to blindly use the `CC` value but keep going through the clang version check when `--enable-clang` is turned on. But on Travis (a Linux host), the `gcc` invocation won't print a clang version, so we would not get past the CLANG_VERSION check in that context. A third approach would be to never run the CLANG_VERSION check if `CC` is explicitly set. That is not a terrible idea; but if the user uses `CC` to pass in a path to some other version of clang that they want to test, probably should still send that through the `CLANG_VERSION` check. So in the end I (pnkfelix) took a fourth approach: do the CLANG_VERSION check if `CC` is unset *or* if `CC` is set to a string ending with `clang`. This way setting `CC` to things like `path/to/clang` or `ccache clang` will still go through the CLANG_VERSION check, while setting `CC` to `gcc` or some unknown compiler will skip the CLANG_VERSION check (regardless of whether the user passed --enable-clang to `configure`). ---- Drive-by fixes: * The call that sets `CFG_CLANG_VERSION` was quoting `"$CFG_CC"` in its invocation, but that does not play nicely with someone who sets `$CFG_CC` to e.g. `ccache clang`, since you do not want to intepret that whole string as a command. (On the other hand, a path with spaces might need the quoted invocation. Not sure which one of these corner use-cases is more important to support.) * Fix chk_cc error message to point user at `gcc` not `cc`.
2014-04-28 18:57:26 +02:00
Check which versions are in your path with gcc --version and g++ --version.
To resolve this problem, either fix your PATH or run configure with --enable-clang"
fi
fi
fi
fi
# Okay, at this point, we have made up our minds about whether we are
# going to force CFG_ENABLE_CLANG or not; save the setting if so.
if [ ! -z "$CFG_ENABLE_CLANG" ]
then
putvar CFG_ENABLE_CLANG
fi
# Same with jemalloc. save the setting here.
if [ ! -z "$CFG_DISABLE_JEMALLOC" ]
then
putvar CFG_DISABLE_JEMALLOC
fi
if [ ! -z "$CFG_LLVM_ROOT" -a -z "$CFG_DISABLE_LLVM_VERSION_CHECK" -a -e "$CFG_LLVM_ROOT/bin/llvm-config" ]
then
step_msg "using custom LLVM at $CFG_LLVM_ROOT"
LLVM_CONFIG="$CFG_LLVM_ROOT/bin/llvm-config"
LLVM_VERSION=$($LLVM_CONFIG --version)
case $LLVM_VERSION in
(3.[5-6]*)
2013-12-13 17:33:50 +01:00
msg "found ok version of LLVM: $LLVM_VERSION"
;;
(*)
err "bad LLVM version: $LLVM_VERSION, need >=3.5"
2013-12-13 17:33:50 +01:00
;;
esac
fi
Make configure respect (and save) values for `CC`, `CXX`, `CFLAGS`, etc. I mostly tried to remain backwards compatible with old invocations of the `configure` script; if you do not want to use `CC` et al., you should not have to; you can keep using `--enable-clang` and/or `--enable-ccache`. The overall intention is to capture the following precedences for guessing the C compiler: 1. Value of `CC` at make invocation time. 2. Value of `CC` at configure invocation time. 3. Compiler inferred at configure invocation time (`gcc` or `clang`). The strategy is to check (at `configure` time) if each of the environment variables is set, and if so, save its value in a corresponding `CFG_` variable (e.g. `CFG_CC`). Then, in the makefiles, if `CC` is not set but `CFG_CC` is, then we use the `CFG_CC` setting as `CC`. Also, I fold the potential user-provided `CFLAGS` and `CXXFLAGS` values into all of the per-platform `CFLAGS` and `CXXFLAGS` settings. (This was opposed to adding `$(CFLAGS)` in an ad-hoc manner to various parts of the mk files.) Fix #13805. ---- Note that if you try to set the compiler to clang via the `CC` and `CXX` environment variables, you will probably need to also set `CXXFLAGS` to `--enable-libcpp` so that LLVM will be configured properly. ---- Introduce CFG_USING_CLANG, which is distinguished from CFG_ENABLE_CLANG because the former represents "we think we're using clang, choose appropriate warning-control options" while the latter represents "we asked configure (or the host required) that we attempt to use clang, so check that we have an appropriate version of clang." The main reason I added this is that I wanted to allow the user to choose clang via setting the `CC` environment variable, but I did not want that method of selection to get confused with the user passing the `--enable-clang` option. ---- A digression: The `configure` script does not infer the compiler setting if `CC` is set; but if `--enable-clang` was passed, then it *does* still attempt to validate that the clang version is compatible. Supporting this required revising `CLANG_VERSION` check to be robust in face of user-provided `CC` value. In particular, on Travis, the `CC` is set to `gcc` and so the natural thing to do is to attempt to use `gcc` as the compiler, but Travis is also passing `--enable-clang` to configure. So, what is the right answer in the face of these contradictory requests? One approach would be to have `--enable-clang` supersede the setting for `CC` (and instead just call whatever we inferred for `CFG_CLANG`). That sounds maximally inflexible to me (pnkfelix): a developer requesting a `CC` value probably wants it respected, and should be able to set it to something else; it is harder for that developer to hack our configure script to change its inferred path to clang. A second approach would be to blindly use the `CC` value but keep going through the clang version check when `--enable-clang` is turned on. But on Travis (a Linux host), the `gcc` invocation won't print a clang version, so we would not get past the CLANG_VERSION check in that context. A third approach would be to never run the CLANG_VERSION check if `CC` is explicitly set. That is not a terrible idea; but if the user uses `CC` to pass in a path to some other version of clang that they want to test, probably should still send that through the `CLANG_VERSION` check. So in the end I (pnkfelix) took a fourth approach: do the CLANG_VERSION check if `CC` is unset *or* if `CC` is set to a string ending with `clang`. This way setting `CC` to things like `path/to/clang` or `ccache clang` will still go through the CLANG_VERSION check, while setting `CC` to `gcc` or some unknown compiler will skip the CLANG_VERSION check (regardless of whether the user passed --enable-clang to `configure`). ---- Drive-by fixes: * The call that sets `CFG_CLANG_VERSION` was quoting `"$CFG_CC"` in its invocation, but that does not play nicely with someone who sets `$CFG_CC` to e.g. `ccache clang`, since you do not want to intepret that whole string as a command. (On the other hand, a path with spaces might need the quoted invocation. Not sure which one of these corner use-cases is more important to support.) * Fix chk_cc error message to point user at `gcc` not `cc`.
2014-04-28 18:57:26 +02:00
# Even when the user overrides the choice of CC, still try to detect
# clang to disable some clang-specific warnings. We here draw a
# distinction between:
#
# CFG_ENABLE_CLANG : passed --enable-clang, or host "requires" clang,
# CFG_USING_CLANG : compiler (clang / gcc / $CC) looks like clang.
#
# This distinction is important because there are some safeguards we
# would prefer to skip when merely CFG_USING_CLANG is set; but when
# CFG_ENABLE_CLANG is set, that indicates that we are opting into
# running such safeguards.
if [ ! -z "$CC" ]
2011-05-19 06:41:40 +02:00
then
Make configure respect (and save) values for `CC`, `CXX`, `CFLAGS`, etc. I mostly tried to remain backwards compatible with old invocations of the `configure` script; if you do not want to use `CC` et al., you should not have to; you can keep using `--enable-clang` and/or `--enable-ccache`. The overall intention is to capture the following precedences for guessing the C compiler: 1. Value of `CC` at make invocation time. 2. Value of `CC` at configure invocation time. 3. Compiler inferred at configure invocation time (`gcc` or `clang`). The strategy is to check (at `configure` time) if each of the environment variables is set, and if so, save its value in a corresponding `CFG_` variable (e.g. `CFG_CC`). Then, in the makefiles, if `CC` is not set but `CFG_CC` is, then we use the `CFG_CC` setting as `CC`. Also, I fold the potential user-provided `CFLAGS` and `CXXFLAGS` values into all of the per-platform `CFLAGS` and `CXXFLAGS` settings. (This was opposed to adding `$(CFLAGS)` in an ad-hoc manner to various parts of the mk files.) Fix #13805. ---- Note that if you try to set the compiler to clang via the `CC` and `CXX` environment variables, you will probably need to also set `CXXFLAGS` to `--enable-libcpp` so that LLVM will be configured properly. ---- Introduce CFG_USING_CLANG, which is distinguished from CFG_ENABLE_CLANG because the former represents "we think we're using clang, choose appropriate warning-control options" while the latter represents "we asked configure (or the host required) that we attempt to use clang, so check that we have an appropriate version of clang." The main reason I added this is that I wanted to allow the user to choose clang via setting the `CC` environment variable, but I did not want that method of selection to get confused with the user passing the `--enable-clang` option. ---- A digression: The `configure` script does not infer the compiler setting if `CC` is set; but if `--enable-clang` was passed, then it *does* still attempt to validate that the clang version is compatible. Supporting this required revising `CLANG_VERSION` check to be robust in face of user-provided `CC` value. In particular, on Travis, the `CC` is set to `gcc` and so the natural thing to do is to attempt to use `gcc` as the compiler, but Travis is also passing `--enable-clang` to configure. So, what is the right answer in the face of these contradictory requests? One approach would be to have `--enable-clang` supersede the setting for `CC` (and instead just call whatever we inferred for `CFG_CLANG`). That sounds maximally inflexible to me (pnkfelix): a developer requesting a `CC` value probably wants it respected, and should be able to set it to something else; it is harder for that developer to hack our configure script to change its inferred path to clang. A second approach would be to blindly use the `CC` value but keep going through the clang version check when `--enable-clang` is turned on. But on Travis (a Linux host), the `gcc` invocation won't print a clang version, so we would not get past the CLANG_VERSION check in that context. A third approach would be to never run the CLANG_VERSION check if `CC` is explicitly set. That is not a terrible idea; but if the user uses `CC` to pass in a path to some other version of clang that they want to test, probably should still send that through the `CLANG_VERSION` check. So in the end I (pnkfelix) took a fourth approach: do the CLANG_VERSION check if `CC` is unset *or* if `CC` is set to a string ending with `clang`. This way setting `CC` to things like `path/to/clang` or `ccache clang` will still go through the CLANG_VERSION check, while setting `CC` to `gcc` or some unknown compiler will skip the CLANG_VERSION check (regardless of whether the user passed --enable-clang to `configure`). ---- Drive-by fixes: * The call that sets `CFG_CLANG_VERSION` was quoting `"$CFG_CC"` in its invocation, but that does not play nicely with someone who sets `$CFG_CC` to e.g. `ccache clang`, since you do not want to intepret that whole string as a command. (On the other hand, a path with spaces might need the quoted invocation. Not sure which one of these corner use-cases is more important to support.) * Fix chk_cc error message to point user at `gcc` not `cc`.
2014-04-28 18:57:26 +02:00
msg "skipping compiler inference steps; using provided CC=$CC"
CFG_CC="$CC"
CFG_OSX_CC_VERSION=$("$CFG_CC" --version 2>&1 | grep "clang")
if [ $? -eq 0 ]
then
Make configure respect (and save) values for `CC`, `CXX`, `CFLAGS`, etc. I mostly tried to remain backwards compatible with old invocations of the `configure` script; if you do not want to use `CC` et al., you should not have to; you can keep using `--enable-clang` and/or `--enable-ccache`. The overall intention is to capture the following precedences for guessing the C compiler: 1. Value of `CC` at make invocation time. 2. Value of `CC` at configure invocation time. 3. Compiler inferred at configure invocation time (`gcc` or `clang`). The strategy is to check (at `configure` time) if each of the environment variables is set, and if so, save its value in a corresponding `CFG_` variable (e.g. `CFG_CC`). Then, in the makefiles, if `CC` is not set but `CFG_CC` is, then we use the `CFG_CC` setting as `CC`. Also, I fold the potential user-provided `CFLAGS` and `CXXFLAGS` values into all of the per-platform `CFLAGS` and `CXXFLAGS` settings. (This was opposed to adding `$(CFLAGS)` in an ad-hoc manner to various parts of the mk files.) Fix #13805. ---- Note that if you try to set the compiler to clang via the `CC` and `CXX` environment variables, you will probably need to also set `CXXFLAGS` to `--enable-libcpp` so that LLVM will be configured properly. ---- Introduce CFG_USING_CLANG, which is distinguished from CFG_ENABLE_CLANG because the former represents "we think we're using clang, choose appropriate warning-control options" while the latter represents "we asked configure (or the host required) that we attempt to use clang, so check that we have an appropriate version of clang." The main reason I added this is that I wanted to allow the user to choose clang via setting the `CC` environment variable, but I did not want that method of selection to get confused with the user passing the `--enable-clang` option. ---- A digression: The `configure` script does not infer the compiler setting if `CC` is set; but if `--enable-clang` was passed, then it *does* still attempt to validate that the clang version is compatible. Supporting this required revising `CLANG_VERSION` check to be robust in face of user-provided `CC` value. In particular, on Travis, the `CC` is set to `gcc` and so the natural thing to do is to attempt to use `gcc` as the compiler, but Travis is also passing `--enable-clang` to configure. So, what is the right answer in the face of these contradictory requests? One approach would be to have `--enable-clang` supersede the setting for `CC` (and instead just call whatever we inferred for `CFG_CLANG`). That sounds maximally inflexible to me (pnkfelix): a developer requesting a `CC` value probably wants it respected, and should be able to set it to something else; it is harder for that developer to hack our configure script to change its inferred path to clang. A second approach would be to blindly use the `CC` value but keep going through the clang version check when `--enable-clang` is turned on. But on Travis (a Linux host), the `gcc` invocation won't print a clang version, so we would not get past the CLANG_VERSION check in that context. A third approach would be to never run the CLANG_VERSION check if `CC` is explicitly set. That is not a terrible idea; but if the user uses `CC` to pass in a path to some other version of clang that they want to test, probably should still send that through the `CLANG_VERSION` check. So in the end I (pnkfelix) took a fourth approach: do the CLANG_VERSION check if `CC` is unset *or* if `CC` is set to a string ending with `clang`. This way setting `CC` to things like `path/to/clang` or `ccache clang` will still go through the CLANG_VERSION check, while setting `CC` to `gcc` or some unknown compiler will skip the CLANG_VERSION check (regardless of whether the user passed --enable-clang to `configure`). ---- Drive-by fixes: * The call that sets `CFG_CLANG_VERSION` was quoting `"$CFG_CC"` in its invocation, but that does not play nicely with someone who sets `$CFG_CC` to e.g. `ccache clang`, since you do not want to intepret that whole string as a command. (On the other hand, a path with spaces might need the quoted invocation. Not sure which one of these corner use-cases is more important to support.) * Fix chk_cc error message to point user at `gcc` not `cc`.
2014-04-28 18:57:26 +02:00
step_msg "note, user-provided CC looks like clang; CC=$CC."
CFG_USING_CLANG=1
putvar CFG_USING_CLANG
fi
else
Make configure respect (and save) values for `CC`, `CXX`, `CFLAGS`, etc. I mostly tried to remain backwards compatible with old invocations of the `configure` script; if you do not want to use `CC` et al., you should not have to; you can keep using `--enable-clang` and/or `--enable-ccache`. The overall intention is to capture the following precedences for guessing the C compiler: 1. Value of `CC` at make invocation time. 2. Value of `CC` at configure invocation time. 3. Compiler inferred at configure invocation time (`gcc` or `clang`). The strategy is to check (at `configure` time) if each of the environment variables is set, and if so, save its value in a corresponding `CFG_` variable (e.g. `CFG_CC`). Then, in the makefiles, if `CC` is not set but `CFG_CC` is, then we use the `CFG_CC` setting as `CC`. Also, I fold the potential user-provided `CFLAGS` and `CXXFLAGS` values into all of the per-platform `CFLAGS` and `CXXFLAGS` settings. (This was opposed to adding `$(CFLAGS)` in an ad-hoc manner to various parts of the mk files.) Fix #13805. ---- Note that if you try to set the compiler to clang via the `CC` and `CXX` environment variables, you will probably need to also set `CXXFLAGS` to `--enable-libcpp` so that LLVM will be configured properly. ---- Introduce CFG_USING_CLANG, which is distinguished from CFG_ENABLE_CLANG because the former represents "we think we're using clang, choose appropriate warning-control options" while the latter represents "we asked configure (or the host required) that we attempt to use clang, so check that we have an appropriate version of clang." The main reason I added this is that I wanted to allow the user to choose clang via setting the `CC` environment variable, but I did not want that method of selection to get confused with the user passing the `--enable-clang` option. ---- A digression: The `configure` script does not infer the compiler setting if `CC` is set; but if `--enable-clang` was passed, then it *does* still attempt to validate that the clang version is compatible. Supporting this required revising `CLANG_VERSION` check to be robust in face of user-provided `CC` value. In particular, on Travis, the `CC` is set to `gcc` and so the natural thing to do is to attempt to use `gcc` as the compiler, but Travis is also passing `--enable-clang` to configure. So, what is the right answer in the face of these contradictory requests? One approach would be to have `--enable-clang` supersede the setting for `CC` (and instead just call whatever we inferred for `CFG_CLANG`). That sounds maximally inflexible to me (pnkfelix): a developer requesting a `CC` value probably wants it respected, and should be able to set it to something else; it is harder for that developer to hack our configure script to change its inferred path to clang. A second approach would be to blindly use the `CC` value but keep going through the clang version check when `--enable-clang` is turned on. But on Travis (a Linux host), the `gcc` invocation won't print a clang version, so we would not get past the CLANG_VERSION check in that context. A third approach would be to never run the CLANG_VERSION check if `CC` is explicitly set. That is not a terrible idea; but if the user uses `CC` to pass in a path to some other version of clang that they want to test, probably should still send that through the `CLANG_VERSION` check. So in the end I (pnkfelix) took a fourth approach: do the CLANG_VERSION check if `CC` is unset *or* if `CC` is set to a string ending with `clang`. This way setting `CC` to things like `path/to/clang` or `ccache clang` will still go through the CLANG_VERSION check, while setting `CC` to `gcc` or some unknown compiler will skip the CLANG_VERSION check (regardless of whether the user passed --enable-clang to `configure`). ---- Drive-by fixes: * The call that sets `CFG_CLANG_VERSION` was quoting `"$CFG_CC"` in its invocation, but that does not play nicely with someone who sets `$CFG_CC` to e.g. `ccache clang`, since you do not want to intepret that whole string as a command. (On the other hand, a path with spaces might need the quoted invocation. Not sure which one of these corner use-cases is more important to support.) * Fix chk_cc error message to point user at `gcc` not `cc`.
2014-04-28 18:57:26 +02:00
if [ ! -z "$CFG_ENABLE_CLANG" ]
then
if [ -z "$CFG_CLANG" ]
then
err "clang requested but not found"
fi
CFG_CC="$CFG_CLANG"
CFG_USING_CLANG=1
putvar CFG_USING_CLANG
else
CFG_CC="gcc"
fi
fi
if [ ! -z "$CFG_ENABLE_CLANG" ]
then
if [ -z "$CC" ] || [[ $CC == *clang ]]
then
CFG_CLANG_VERSION=$($CFG_CC \
--version \
| grep version \
| sed 's/.*\(version .*\)/\1/; s/.*based on \(LLVM .*\))/\1/' \
| cut -d ' ' -f 2)
case $CFG_CLANG_VERSION in
(3.2* | 3.3* | 3.4* | 3.5* | 3.6*)
Make configure respect (and save) values for `CC`, `CXX`, `CFLAGS`, etc. I mostly tried to remain backwards compatible with old invocations of the `configure` script; if you do not want to use `CC` et al., you should not have to; you can keep using `--enable-clang` and/or `--enable-ccache`. The overall intention is to capture the following precedences for guessing the C compiler: 1. Value of `CC` at make invocation time. 2. Value of `CC` at configure invocation time. 3. Compiler inferred at configure invocation time (`gcc` or `clang`). The strategy is to check (at `configure` time) if each of the environment variables is set, and if so, save its value in a corresponding `CFG_` variable (e.g. `CFG_CC`). Then, in the makefiles, if `CC` is not set but `CFG_CC` is, then we use the `CFG_CC` setting as `CC`. Also, I fold the potential user-provided `CFLAGS` and `CXXFLAGS` values into all of the per-platform `CFLAGS` and `CXXFLAGS` settings. (This was opposed to adding `$(CFLAGS)` in an ad-hoc manner to various parts of the mk files.) Fix #13805. ---- Note that if you try to set the compiler to clang via the `CC` and `CXX` environment variables, you will probably need to also set `CXXFLAGS` to `--enable-libcpp` so that LLVM will be configured properly. ---- Introduce CFG_USING_CLANG, which is distinguished from CFG_ENABLE_CLANG because the former represents "we think we're using clang, choose appropriate warning-control options" while the latter represents "we asked configure (or the host required) that we attempt to use clang, so check that we have an appropriate version of clang." The main reason I added this is that I wanted to allow the user to choose clang via setting the `CC` environment variable, but I did not want that method of selection to get confused with the user passing the `--enable-clang` option. ---- A digression: The `configure` script does not infer the compiler setting if `CC` is set; but if `--enable-clang` was passed, then it *does* still attempt to validate that the clang version is compatible. Supporting this required revising `CLANG_VERSION` check to be robust in face of user-provided `CC` value. In particular, on Travis, the `CC` is set to `gcc` and so the natural thing to do is to attempt to use `gcc` as the compiler, but Travis is also passing `--enable-clang` to configure. So, what is the right answer in the face of these contradictory requests? One approach would be to have `--enable-clang` supersede the setting for `CC` (and instead just call whatever we inferred for `CFG_CLANG`). That sounds maximally inflexible to me (pnkfelix): a developer requesting a `CC` value probably wants it respected, and should be able to set it to something else; it is harder for that developer to hack our configure script to change its inferred path to clang. A second approach would be to blindly use the `CC` value but keep going through the clang version check when `--enable-clang` is turned on. But on Travis (a Linux host), the `gcc` invocation won't print a clang version, so we would not get past the CLANG_VERSION check in that context. A third approach would be to never run the CLANG_VERSION check if `CC` is explicitly set. That is not a terrible idea; but if the user uses `CC` to pass in a path to some other version of clang that they want to test, probably should still send that through the `CLANG_VERSION` check. So in the end I (pnkfelix) took a fourth approach: do the CLANG_VERSION check if `CC` is unset *or* if `CC` is set to a string ending with `clang`. This way setting `CC` to things like `path/to/clang` or `ccache clang` will still go through the CLANG_VERSION check, while setting `CC` to `gcc` or some unknown compiler will skip the CLANG_VERSION check (regardless of whether the user passed --enable-clang to `configure`). ---- Drive-by fixes: * The call that sets `CFG_CLANG_VERSION` was quoting `"$CFG_CC"` in its invocation, but that does not play nicely with someone who sets `$CFG_CC` to e.g. `ccache clang`, since you do not want to intepret that whole string as a command. (On the other hand, a path with spaces might need the quoted invocation. Not sure which one of these corner use-cases is more important to support.) * Fix chk_cc error message to point user at `gcc` not `cc`.
2014-04-28 18:57:26 +02:00
step_msg "found ok version of CLANG: $CFG_CLANG_VERSION"
if [ -z "$CC" ]
then
CFG_CC="clang"
CFG_CXX="clang++"
Make configure respect (and save) values for `CC`, `CXX`, `CFLAGS`, etc. I mostly tried to remain backwards compatible with old invocations of the `configure` script; if you do not want to use `CC` et al., you should not have to; you can keep using `--enable-clang` and/or `--enable-ccache`. The overall intention is to capture the following precedences for guessing the C compiler: 1. Value of `CC` at make invocation time. 2. Value of `CC` at configure invocation time. 3. Compiler inferred at configure invocation time (`gcc` or `clang`). The strategy is to check (at `configure` time) if each of the environment variables is set, and if so, save its value in a corresponding `CFG_` variable (e.g. `CFG_CC`). Then, in the makefiles, if `CC` is not set but `CFG_CC` is, then we use the `CFG_CC` setting as `CC`. Also, I fold the potential user-provided `CFLAGS` and `CXXFLAGS` values into all of the per-platform `CFLAGS` and `CXXFLAGS` settings. (This was opposed to adding `$(CFLAGS)` in an ad-hoc manner to various parts of the mk files.) Fix #13805. ---- Note that if you try to set the compiler to clang via the `CC` and `CXX` environment variables, you will probably need to also set `CXXFLAGS` to `--enable-libcpp` so that LLVM will be configured properly. ---- Introduce CFG_USING_CLANG, which is distinguished from CFG_ENABLE_CLANG because the former represents "we think we're using clang, choose appropriate warning-control options" while the latter represents "we asked configure (or the host required) that we attempt to use clang, so check that we have an appropriate version of clang." The main reason I added this is that I wanted to allow the user to choose clang via setting the `CC` environment variable, but I did not want that method of selection to get confused with the user passing the `--enable-clang` option. ---- A digression: The `configure` script does not infer the compiler setting if `CC` is set; but if `--enable-clang` was passed, then it *does* still attempt to validate that the clang version is compatible. Supporting this required revising `CLANG_VERSION` check to be robust in face of user-provided `CC` value. In particular, on Travis, the `CC` is set to `gcc` and so the natural thing to do is to attempt to use `gcc` as the compiler, but Travis is also passing `--enable-clang` to configure. So, what is the right answer in the face of these contradictory requests? One approach would be to have `--enable-clang` supersede the setting for `CC` (and instead just call whatever we inferred for `CFG_CLANG`). That sounds maximally inflexible to me (pnkfelix): a developer requesting a `CC` value probably wants it respected, and should be able to set it to something else; it is harder for that developer to hack our configure script to change its inferred path to clang. A second approach would be to blindly use the `CC` value but keep going through the clang version check when `--enable-clang` is turned on. But on Travis (a Linux host), the `gcc` invocation won't print a clang version, so we would not get past the CLANG_VERSION check in that context. A third approach would be to never run the CLANG_VERSION check if `CC` is explicitly set. That is not a terrible idea; but if the user uses `CC` to pass in a path to some other version of clang that they want to test, probably should still send that through the `CLANG_VERSION` check. So in the end I (pnkfelix) took a fourth approach: do the CLANG_VERSION check if `CC` is unset *or* if `CC` is set to a string ending with `clang`. This way setting `CC` to things like `path/to/clang` or `ccache clang` will still go through the CLANG_VERSION check, while setting `CC` to `gcc` or some unknown compiler will skip the CLANG_VERSION check (regardless of whether the user passed --enable-clang to `configure`). ---- Drive-by fixes: * The call that sets `CFG_CLANG_VERSION` was quoting `"$CFG_CC"` in its invocation, but that does not play nicely with someone who sets `$CFG_CC` to e.g. `ccache clang`, since you do not want to intepret that whole string as a command. (On the other hand, a path with spaces might need the quoted invocation. Not sure which one of these corner use-cases is more important to support.) * Fix chk_cc error message to point user at `gcc` not `cc`.
2014-04-28 18:57:26 +02:00
fi
;;
(*)
err "bad CLANG version: $CFG_CLANG_VERSION, need >=3.0svn"
;;
esac
else
msg "skipping CFG_ENABLE_CLANG version check; provided CC=$CC"
fi
2011-05-19 06:41:40 +02:00
fi
if [ ! -z "$CFG_ENABLE_CCACHE" ]
then
Make configure respect (and save) values for `CC`, `CXX`, `CFLAGS`, etc. I mostly tried to remain backwards compatible with old invocations of the `configure` script; if you do not want to use `CC` et al., you should not have to; you can keep using `--enable-clang` and/or `--enable-ccache`. The overall intention is to capture the following precedences for guessing the C compiler: 1. Value of `CC` at make invocation time. 2. Value of `CC` at configure invocation time. 3. Compiler inferred at configure invocation time (`gcc` or `clang`). The strategy is to check (at `configure` time) if each of the environment variables is set, and if so, save its value in a corresponding `CFG_` variable (e.g. `CFG_CC`). Then, in the makefiles, if `CC` is not set but `CFG_CC` is, then we use the `CFG_CC` setting as `CC`. Also, I fold the potential user-provided `CFLAGS` and `CXXFLAGS` values into all of the per-platform `CFLAGS` and `CXXFLAGS` settings. (This was opposed to adding `$(CFLAGS)` in an ad-hoc manner to various parts of the mk files.) Fix #13805. ---- Note that if you try to set the compiler to clang via the `CC` and `CXX` environment variables, you will probably need to also set `CXXFLAGS` to `--enable-libcpp` so that LLVM will be configured properly. ---- Introduce CFG_USING_CLANG, which is distinguished from CFG_ENABLE_CLANG because the former represents "we think we're using clang, choose appropriate warning-control options" while the latter represents "we asked configure (or the host required) that we attempt to use clang, so check that we have an appropriate version of clang." The main reason I added this is that I wanted to allow the user to choose clang via setting the `CC` environment variable, but I did not want that method of selection to get confused with the user passing the `--enable-clang` option. ---- A digression: The `configure` script does not infer the compiler setting if `CC` is set; but if `--enable-clang` was passed, then it *does* still attempt to validate that the clang version is compatible. Supporting this required revising `CLANG_VERSION` check to be robust in face of user-provided `CC` value. In particular, on Travis, the `CC` is set to `gcc` and so the natural thing to do is to attempt to use `gcc` as the compiler, but Travis is also passing `--enable-clang` to configure. So, what is the right answer in the face of these contradictory requests? One approach would be to have `--enable-clang` supersede the setting for `CC` (and instead just call whatever we inferred for `CFG_CLANG`). That sounds maximally inflexible to me (pnkfelix): a developer requesting a `CC` value probably wants it respected, and should be able to set it to something else; it is harder for that developer to hack our configure script to change its inferred path to clang. A second approach would be to blindly use the `CC` value but keep going through the clang version check when `--enable-clang` is turned on. But on Travis (a Linux host), the `gcc` invocation won't print a clang version, so we would not get past the CLANG_VERSION check in that context. A third approach would be to never run the CLANG_VERSION check if `CC` is explicitly set. That is not a terrible idea; but if the user uses `CC` to pass in a path to some other version of clang that they want to test, probably should still send that through the `CLANG_VERSION` check. So in the end I (pnkfelix) took a fourth approach: do the CLANG_VERSION check if `CC` is unset *or* if `CC` is set to a string ending with `clang`. This way setting `CC` to things like `path/to/clang` or `ccache clang` will still go through the CLANG_VERSION check, while setting `CC` to `gcc` or some unknown compiler will skip the CLANG_VERSION check (regardless of whether the user passed --enable-clang to `configure`). ---- Drive-by fixes: * The call that sets `CFG_CLANG_VERSION` was quoting `"$CFG_CC"` in its invocation, but that does not play nicely with someone who sets `$CFG_CC` to e.g. `ccache clang`, since you do not want to intepret that whole string as a command. (On the other hand, a path with spaces might need the quoted invocation. Not sure which one of these corner use-cases is more important to support.) * Fix chk_cc error message to point user at `gcc` not `cc`.
2014-04-28 18:57:26 +02:00
if [ -z "$CC" ]
then
Make configure respect (and save) values for `CC`, `CXX`, `CFLAGS`, etc. I mostly tried to remain backwards compatible with old invocations of the `configure` script; if you do not want to use `CC` et al., you should not have to; you can keep using `--enable-clang` and/or `--enable-ccache`. The overall intention is to capture the following precedences for guessing the C compiler: 1. Value of `CC` at make invocation time. 2. Value of `CC` at configure invocation time. 3. Compiler inferred at configure invocation time (`gcc` or `clang`). The strategy is to check (at `configure` time) if each of the environment variables is set, and if so, save its value in a corresponding `CFG_` variable (e.g. `CFG_CC`). Then, in the makefiles, if `CC` is not set but `CFG_CC` is, then we use the `CFG_CC` setting as `CC`. Also, I fold the potential user-provided `CFLAGS` and `CXXFLAGS` values into all of the per-platform `CFLAGS` and `CXXFLAGS` settings. (This was opposed to adding `$(CFLAGS)` in an ad-hoc manner to various parts of the mk files.) Fix #13805. ---- Note that if you try to set the compiler to clang via the `CC` and `CXX` environment variables, you will probably need to also set `CXXFLAGS` to `--enable-libcpp` so that LLVM will be configured properly. ---- Introduce CFG_USING_CLANG, which is distinguished from CFG_ENABLE_CLANG because the former represents "we think we're using clang, choose appropriate warning-control options" while the latter represents "we asked configure (or the host required) that we attempt to use clang, so check that we have an appropriate version of clang." The main reason I added this is that I wanted to allow the user to choose clang via setting the `CC` environment variable, but I did not want that method of selection to get confused with the user passing the `--enable-clang` option. ---- A digression: The `configure` script does not infer the compiler setting if `CC` is set; but if `--enable-clang` was passed, then it *does* still attempt to validate that the clang version is compatible. Supporting this required revising `CLANG_VERSION` check to be robust in face of user-provided `CC` value. In particular, on Travis, the `CC` is set to `gcc` and so the natural thing to do is to attempt to use `gcc` as the compiler, but Travis is also passing `--enable-clang` to configure. So, what is the right answer in the face of these contradictory requests? One approach would be to have `--enable-clang` supersede the setting for `CC` (and instead just call whatever we inferred for `CFG_CLANG`). That sounds maximally inflexible to me (pnkfelix): a developer requesting a `CC` value probably wants it respected, and should be able to set it to something else; it is harder for that developer to hack our configure script to change its inferred path to clang. A second approach would be to blindly use the `CC` value but keep going through the clang version check when `--enable-clang` is turned on. But on Travis (a Linux host), the `gcc` invocation won't print a clang version, so we would not get past the CLANG_VERSION check in that context. A third approach would be to never run the CLANG_VERSION check if `CC` is explicitly set. That is not a terrible idea; but if the user uses `CC` to pass in a path to some other version of clang that they want to test, probably should still send that through the `CLANG_VERSION` check. So in the end I (pnkfelix) took a fourth approach: do the CLANG_VERSION check if `CC` is unset *or* if `CC` is set to a string ending with `clang`. This way setting `CC` to things like `path/to/clang` or `ccache clang` will still go through the CLANG_VERSION check, while setting `CC` to `gcc` or some unknown compiler will skip the CLANG_VERSION check (regardless of whether the user passed --enable-clang to `configure`). ---- Drive-by fixes: * The call that sets `CFG_CLANG_VERSION` was quoting `"$CFG_CC"` in its invocation, but that does not play nicely with someone who sets `$CFG_CC` to e.g. `ccache clang`, since you do not want to intepret that whole string as a command. (On the other hand, a path with spaces might need the quoted invocation. Not sure which one of these corner use-cases is more important to support.) * Fix chk_cc error message to point user at `gcc` not `cc`.
2014-04-28 18:57:26 +02:00
if [ -z "$CFG_CCACHE" ]
then
err "ccache requested but not found"
fi
CFG_CC="ccache $CFG_CC"
fi
Make configure respect (and save) values for `CC`, `CXX`, `CFLAGS`, etc. I mostly tried to remain backwards compatible with old invocations of the `configure` script; if you do not want to use `CC` et al., you should not have to; you can keep using `--enable-clang` and/or `--enable-ccache`. The overall intention is to capture the following precedences for guessing the C compiler: 1. Value of `CC` at make invocation time. 2. Value of `CC` at configure invocation time. 3. Compiler inferred at configure invocation time (`gcc` or `clang`). The strategy is to check (at `configure` time) if each of the environment variables is set, and if so, save its value in a corresponding `CFG_` variable (e.g. `CFG_CC`). Then, in the makefiles, if `CC` is not set but `CFG_CC` is, then we use the `CFG_CC` setting as `CC`. Also, I fold the potential user-provided `CFLAGS` and `CXXFLAGS` values into all of the per-platform `CFLAGS` and `CXXFLAGS` settings. (This was opposed to adding `$(CFLAGS)` in an ad-hoc manner to various parts of the mk files.) Fix #13805. ---- Note that if you try to set the compiler to clang via the `CC` and `CXX` environment variables, you will probably need to also set `CXXFLAGS` to `--enable-libcpp` so that LLVM will be configured properly. ---- Introduce CFG_USING_CLANG, which is distinguished from CFG_ENABLE_CLANG because the former represents "we think we're using clang, choose appropriate warning-control options" while the latter represents "we asked configure (or the host required) that we attempt to use clang, so check that we have an appropriate version of clang." The main reason I added this is that I wanted to allow the user to choose clang via setting the `CC` environment variable, but I did not want that method of selection to get confused with the user passing the `--enable-clang` option. ---- A digression: The `configure` script does not infer the compiler setting if `CC` is set; but if `--enable-clang` was passed, then it *does* still attempt to validate that the clang version is compatible. Supporting this required revising `CLANG_VERSION` check to be robust in face of user-provided `CC` value. In particular, on Travis, the `CC` is set to `gcc` and so the natural thing to do is to attempt to use `gcc` as the compiler, but Travis is also passing `--enable-clang` to configure. So, what is the right answer in the face of these contradictory requests? One approach would be to have `--enable-clang` supersede the setting for `CC` (and instead just call whatever we inferred for `CFG_CLANG`). That sounds maximally inflexible to me (pnkfelix): a developer requesting a `CC` value probably wants it respected, and should be able to set it to something else; it is harder for that developer to hack our configure script to change its inferred path to clang. A second approach would be to blindly use the `CC` value but keep going through the clang version check when `--enable-clang` is turned on. But on Travis (a Linux host), the `gcc` invocation won't print a clang version, so we would not get past the CLANG_VERSION check in that context. A third approach would be to never run the CLANG_VERSION check if `CC` is explicitly set. That is not a terrible idea; but if the user uses `CC` to pass in a path to some other version of clang that they want to test, probably should still send that through the `CLANG_VERSION` check. So in the end I (pnkfelix) took a fourth approach: do the CLANG_VERSION check if `CC` is unset *or* if `CC` is set to a string ending with `clang`. This way setting `CC` to things like `path/to/clang` or `ccache clang` will still go through the CLANG_VERSION check, while setting `CC` to `gcc` or some unknown compiler will skip the CLANG_VERSION check (regardless of whether the user passed --enable-clang to `configure`). ---- Drive-by fixes: * The call that sets `CFG_CLANG_VERSION` was quoting `"$CFG_CC"` in its invocation, but that does not play nicely with someone who sets `$CFG_CC` to e.g. `ccache clang`, since you do not want to intepret that whole string as a command. (On the other hand, a path with spaces might need the quoted invocation. Not sure which one of these corner use-cases is more important to support.) * Fix chk_cc error message to point user at `gcc` not `cc`.
2014-04-28 18:57:26 +02:00
fi
Make configure respect (and save) values for `CC`, `CXX`, `CFLAGS`, etc. I mostly tried to remain backwards compatible with old invocations of the `configure` script; if you do not want to use `CC` et al., you should not have to; you can keep using `--enable-clang` and/or `--enable-ccache`. The overall intention is to capture the following precedences for guessing the C compiler: 1. Value of `CC` at make invocation time. 2. Value of `CC` at configure invocation time. 3. Compiler inferred at configure invocation time (`gcc` or `clang`). The strategy is to check (at `configure` time) if each of the environment variables is set, and if so, save its value in a corresponding `CFG_` variable (e.g. `CFG_CC`). Then, in the makefiles, if `CC` is not set but `CFG_CC` is, then we use the `CFG_CC` setting as `CC`. Also, I fold the potential user-provided `CFLAGS` and `CXXFLAGS` values into all of the per-platform `CFLAGS` and `CXXFLAGS` settings. (This was opposed to adding `$(CFLAGS)` in an ad-hoc manner to various parts of the mk files.) Fix #13805. ---- Note that if you try to set the compiler to clang via the `CC` and `CXX` environment variables, you will probably need to also set `CXXFLAGS` to `--enable-libcpp` so that LLVM will be configured properly. ---- Introduce CFG_USING_CLANG, which is distinguished from CFG_ENABLE_CLANG because the former represents "we think we're using clang, choose appropriate warning-control options" while the latter represents "we asked configure (or the host required) that we attempt to use clang, so check that we have an appropriate version of clang." The main reason I added this is that I wanted to allow the user to choose clang via setting the `CC` environment variable, but I did not want that method of selection to get confused with the user passing the `--enable-clang` option. ---- A digression: The `configure` script does not infer the compiler setting if `CC` is set; but if `--enable-clang` was passed, then it *does* still attempt to validate that the clang version is compatible. Supporting this required revising `CLANG_VERSION` check to be robust in face of user-provided `CC` value. In particular, on Travis, the `CC` is set to `gcc` and so the natural thing to do is to attempt to use `gcc` as the compiler, but Travis is also passing `--enable-clang` to configure. So, what is the right answer in the face of these contradictory requests? One approach would be to have `--enable-clang` supersede the setting for `CC` (and instead just call whatever we inferred for `CFG_CLANG`). That sounds maximally inflexible to me (pnkfelix): a developer requesting a `CC` value probably wants it respected, and should be able to set it to something else; it is harder for that developer to hack our configure script to change its inferred path to clang. A second approach would be to blindly use the `CC` value but keep going through the clang version check when `--enable-clang` is turned on. But on Travis (a Linux host), the `gcc` invocation won't print a clang version, so we would not get past the CLANG_VERSION check in that context. A third approach would be to never run the CLANG_VERSION check if `CC` is explicitly set. That is not a terrible idea; but if the user uses `CC` to pass in a path to some other version of clang that they want to test, probably should still send that through the `CLANG_VERSION` check. So in the end I (pnkfelix) took a fourth approach: do the CLANG_VERSION check if `CC` is unset *or* if `CC` is set to a string ending with `clang`. This way setting `CC` to things like `path/to/clang` or `ccache clang` will still go through the CLANG_VERSION check, while setting `CC` to `gcc` or some unknown compiler will skip the CLANG_VERSION check (regardless of whether the user passed --enable-clang to `configure`). ---- Drive-by fixes: * The call that sets `CFG_CLANG_VERSION` was quoting `"$CFG_CC"` in its invocation, but that does not play nicely with someone who sets `$CFG_CC` to e.g. `ccache clang`, since you do not want to intepret that whole string as a command. (On the other hand, a path with spaces might need the quoted invocation. Not sure which one of these corner use-cases is more important to support.) * Fix chk_cc error message to point user at `gcc` not `cc`.
2014-04-28 18:57:26 +02:00
if [ -z "$CC" -a -z "$CFG_ENABLE_CLANG" -a -z "$CFG_GCC" ]
then
err "either clang or gcc is required"
fi
Make configure respect (and save) values for `CC`, `CXX`, `CFLAGS`, etc. I mostly tried to remain backwards compatible with old invocations of the `configure` script; if you do not want to use `CC` et al., you should not have to; you can keep using `--enable-clang` and/or `--enable-ccache`. The overall intention is to capture the following precedences for guessing the C compiler: 1. Value of `CC` at make invocation time. 2. Value of `CC` at configure invocation time. 3. Compiler inferred at configure invocation time (`gcc` or `clang`). The strategy is to check (at `configure` time) if each of the environment variables is set, and if so, save its value in a corresponding `CFG_` variable (e.g. `CFG_CC`). Then, in the makefiles, if `CC` is not set but `CFG_CC` is, then we use the `CFG_CC` setting as `CC`. Also, I fold the potential user-provided `CFLAGS` and `CXXFLAGS` values into all of the per-platform `CFLAGS` and `CXXFLAGS` settings. (This was opposed to adding `$(CFLAGS)` in an ad-hoc manner to various parts of the mk files.) Fix #13805. ---- Note that if you try to set the compiler to clang via the `CC` and `CXX` environment variables, you will probably need to also set `CXXFLAGS` to `--enable-libcpp` so that LLVM will be configured properly. ---- Introduce CFG_USING_CLANG, which is distinguished from CFG_ENABLE_CLANG because the former represents "we think we're using clang, choose appropriate warning-control options" while the latter represents "we asked configure (or the host required) that we attempt to use clang, so check that we have an appropriate version of clang." The main reason I added this is that I wanted to allow the user to choose clang via setting the `CC` environment variable, but I did not want that method of selection to get confused with the user passing the `--enable-clang` option. ---- A digression: The `configure` script does not infer the compiler setting if `CC` is set; but if `--enable-clang` was passed, then it *does* still attempt to validate that the clang version is compatible. Supporting this required revising `CLANG_VERSION` check to be robust in face of user-provided `CC` value. In particular, on Travis, the `CC` is set to `gcc` and so the natural thing to do is to attempt to use `gcc` as the compiler, but Travis is also passing `--enable-clang` to configure. So, what is the right answer in the face of these contradictory requests? One approach would be to have `--enable-clang` supersede the setting for `CC` (and instead just call whatever we inferred for `CFG_CLANG`). That sounds maximally inflexible to me (pnkfelix): a developer requesting a `CC` value probably wants it respected, and should be able to set it to something else; it is harder for that developer to hack our configure script to change its inferred path to clang. A second approach would be to blindly use the `CC` value but keep going through the clang version check when `--enable-clang` is turned on. But on Travis (a Linux host), the `gcc` invocation won't print a clang version, so we would not get past the CLANG_VERSION check in that context. A third approach would be to never run the CLANG_VERSION check if `CC` is explicitly set. That is not a terrible idea; but if the user uses `CC` to pass in a path to some other version of clang that they want to test, probably should still send that through the `CLANG_VERSION` check. So in the end I (pnkfelix) took a fourth approach: do the CLANG_VERSION check if `CC` is unset *or* if `CC` is set to a string ending with `clang`. This way setting `CC` to things like `path/to/clang` or `ccache clang` will still go through the CLANG_VERSION check, while setting `CC` to `gcc` or some unknown compiler will skip the CLANG_VERSION check (regardless of whether the user passed --enable-clang to `configure`). ---- Drive-by fixes: * The call that sets `CFG_CLANG_VERSION` was quoting `"$CFG_CC"` in its invocation, but that does not play nicely with someone who sets `$CFG_CC` to e.g. `ccache clang`, since you do not want to intepret that whole string as a command. (On the other hand, a path with spaces might need the quoted invocation. Not sure which one of these corner use-cases is more important to support.) * Fix chk_cc error message to point user at `gcc` not `cc`.
2014-04-28 18:57:26 +02:00
# All safeguards based on $CFG_ENABLE_CLANG should occur before this
# point in the script; after this point, script logic should inspect
# $CFG_USING_CLANG rather than $CFG_ENABLE_CLANG.
# Set CFG_{CC,CXX,CPP,CFLAGS,CXXFLAGS}
envopt CC
envopt CXX
envopt CPP
envopt CFLAGS
envopt CXXFLAGS
# a little post-processing of various config values
CFG_PREFIX=${CFG_PREFIX%/}
2013-10-21 11:18:21 +02:00
CFG_MANDIR=${CFG_MANDIR%/}
CFG_HOST="$(echo $CFG_HOST | tr ',' ' ')"
CFG_TARGET="$(echo $CFG_TARGET | tr ',' ' ')"
CFG_SUPPORTED_TARGET=""
for target_file in ${CFG_SRC_DIR}mk/cfg/*.mk; do
CFG_SUPPORTED_TARGET="${CFG_SUPPORTED_TARGET} $(basename "$target_file" .mk)"
done
2011-12-03 01:04:17 +01:00
# copy host-triples to target-triples so that hosts are a subset of targets
V_TEMP=""
2013-10-21 11:18:21 +02:00
for i in $CFG_HOST $CFG_TARGET;
do
echo "$V_TEMP" | grep -qF $i || V_TEMP="$V_TEMP${V_TEMP:+ }$i"
done
2013-10-21 11:18:21 +02:00
CFG_TARGET=$V_TEMP
# check target-specific tool-chains
2013-10-21 11:18:21 +02:00
for i in $CFG_TARGET
do
L_CHECK=false
2013-10-21 11:18:21 +02:00
for j in $CFG_SUPPORTED_TARGET
do
if [ $i = $j ]
then
L_CHECK=true
fi
done
if [ $L_CHECK = false ]
then
err "unsupported target triples \"$i\" found"
fi
case $i in
arm-linux-androideabi)
if [ ! -f $CFG_ANDROID_CROSS_PATH/bin/arm-linux-androideabi-gcc ]
then
err "NDK $CFG_ANDROID_CROSS_PATH/bin/arm-linux-androideabi-gcc not found"
fi
if [ ! -f $CFG_ANDROID_CROSS_PATH/bin/arm-linux-androideabi-g++ ]
then
err "NDK $CFG_ANDROID_CROSS_PATH/bin/arm-linux-androideabi-g++ not found"
fi
if [ ! -f $CFG_ANDROID_CROSS_PATH/bin/arm-linux-androideabi-ar ]
then
err "NDK $CFG_ANDROID_CROSS_PATH/bin/arm-linux-androideabi-ar not found"
fi
;;
2013-10-31 20:36:27 +01:00
arm-apple-darwin)
if [ $CFG_OSTYPE != apple-darwin ]
then
err "The iOS target is only supported on Mac OS X"
fi
;;
*)
;;
esac
done
2011-12-03 01:04:17 +01:00
if [ ! -z "$CFG_PERF" ]
then
2012-02-29 06:02:12 +01:00
HAVE_PERF_LOGFD=`$CFG_PERF stat --log-fd 2>&1 | grep 'unknown option'`
if [ -z "$HAVE_PERF_LOGFD" ];
then
CFG_PERF_WITH_LOGFD=1
putvar CFG_PERF_WITH_LOGFD
fi
fi
step_msg "making directories"
2011-11-01 23:22:07 +01:00
for i in \
doc doc/std doc/extra \
2014-03-09 22:10:42 +01:00
dl tmp dist
do
make_dir $i
done
2013-10-21 11:18:21 +02:00
for t in $CFG_HOST
do
make_dir $t/llvm
done
2013-10-21 11:18:21 +02:00
for t in $CFG_HOST
do
2013-09-04 08:48:45 +02:00
make_dir $t/rustllvm
done
2013-10-21 11:18:21 +02:00
for t in $CFG_TARGET
do
make_dir $t/rt
for s in 0 1 2 3
do
make_dir $t/rt/stage$s
make_dir $t/rt/jemalloc
for i in \
isaac sync test \
2015-01-10 04:49:54 +01:00
arch/i386 arch/x86_64 arch/arm arch/aarch64 arch/mips arch/powerpc
do
make_dir $t/rt/stage$s/$i
done
done
done
for h in $CFG_HOST
do
2013-10-21 11:18:21 +02:00
for t in $CFG_TARGET
do
# host lib dir stage0
make_dir $h/stage0/lib
# target bin dir stage0
make_dir $h/stage0/lib/rustlib/$t/bin
# target lib dir stage0
make_dir $h/stage0/lib/rustlib/$t/lib
2011-11-21 22:11:40 +01:00
for i in 0 1 2 3
do
# host bin dir
make_dir $h/stage$i/bin
2011-11-21 22:11:40 +01:00
# host lib dir
make_dir $h/stage$i/$CFG_LIBDIR_RELATIVE
# host test dir
make_dir $h/stage$i/test
2011-11-21 22:11:40 +01:00
# target bin dir
make_dir $h/stage$i/$CFG_LIBDIR_RELATIVE/rustlib/$t/bin
2011-11-21 22:11:40 +01:00
# target lib dir
make_dir $h/stage$i/$CFG_LIBDIR_RELATIVE/rustlib/$t/lib
2011-11-21 22:11:40 +01:00
done
done
2011-11-22 07:45:14 +01:00
make_dir $h/test/run-pass
make_dir $h/test/run-pass-valgrind
make_dir $h/test/run-pass-fulldeps
2011-11-22 07:45:14 +01:00
make_dir $h/test/run-fail
make_dir $h/test/compile-fail
2015-02-11 23:09:30 +01:00
make_dir $h/test/parse-fail
make_dir $h/test/compile-fail-fulldeps
2011-11-22 07:45:14 +01:00
make_dir $h/test/bench
make_dir $h/test/perf
make_dir $h/test/pretty
make_dir $h/test/debuginfo-gdb
make_dir $h/test/debuginfo-lldb
make_dir $h/test/codegen
make_dir $h/test/rustdoc
done
# Configure submodules
step_msg "configuring submodules"
# Have to be in the top of src directory for this
if [ -z $CFG_DISABLE_MANAGE_SUBMODULES ]
then
cd ${CFG_SRC_DIR}
msg "git: submodule sync"
"${CFG_GIT}" submodule sync
msg "git: submodule init"
"${CFG_GIT}" submodule init
# Disable submodules that we're not using
if [ ! -z "${CFG_LLVM_ROOT}" ]; then
msg "git: submodule deinit src/llvm"
"${CFG_GIT}" submodule deinit src/llvm
fi
if [ ! -z "${CFG_JEMALLOC_ROOT}" ]; then
msg "git: submodule deinit src/jemalloc"
"${CFG_GIT}" submodule deinit src/jemalloc
fi
msg "git: submodule update"
"${CFG_GIT}" submodule update
need_ok "git failed"
msg "git: submodule foreach sync"
"${CFG_GIT}" submodule foreach --recursive 'if test -e .gitmodules; then git submodule sync; fi'
need_ok "git failed"
2012-10-05 20:04:45 +02:00
msg "git: submodule foreach update"
"${CFG_GIT}" submodule update --recursive
2012-10-05 20:04:45 +02:00
need_ok "git failed"
# NB: this is just for the sake of getting the submodule SHA1 values
# and status written into the build log.
msg "git: submodule status"
"${CFG_GIT}" submodule status --recursive
msg "git: submodule clobber"
"${CFG_GIT}" submodule foreach --recursive git clean -dxf
need_ok "git failed"
"${CFG_GIT}" submodule foreach --recursive git checkout .
need_ok "git failed"
cd ${CFG_BUILD_DIR}
fi
# Configure llvm, only if necessary
step_msg "looking at LLVM"
CFG_LLVM_SRC_DIR=${CFG_SRC_DIR}src/llvm/
2013-10-21 11:18:21 +02:00
for t in $CFG_HOST
do
do_reconfigure=1
if [ -z $CFG_LLVM_ROOT ]
then
LLVM_BUILD_DIR=${CFG_BUILD_DIR}$t/llvm
if [ ! -z "$CFG_DISABLE_OPTIMIZE_LLVM" ]
then
2013-02-27 02:30:32 +01:00
LLVM_DBG_OPTS="--enable-debug-symbols --disable-optimized"
# Just use LLVM straight from its build directory to
# avoid 'make install' time
LLVM_INST_DIR=$LLVM_BUILD_DIR/Debug
else
LLVM_DBG_OPTS="--enable-optimized"
LLVM_INST_DIR=$LLVM_BUILD_DIR/Release
fi
if [ -z "$CFG_ENABLE_LLVM_ASSERTIONS" ]
then
LLVM_ASSERTION_OPTS="--disable-assertions"
else
LLVM_ASSERTION_OPTS="--enable-assertions"
LLVM_INST_DIR=${LLVM_INST_DIR}+Asserts
fi
else
msg "not reconfiguring LLVM, external LLVM root"
# The user is using their own LLVM
LLVM_BUILD_DIR=
LLVM_INST_DIR=$CFG_LLVM_ROOT
do_reconfigure=0
fi
2011-11-11 20:21:26 +01:00
if [ ${do_reconfigure} -ne 0 ]
2011-11-11 00:54:31 +01:00
then
# because git is hilarious, it might have put the module index
# in a couple places.
index1="${CFG_SRC_DIR}.git/modules/src/llvm/index"
index2="${CFG_SRC_DIR}src/llvm/.git/index"
for index in ${index1} ${index2}
do
config_status="${LLVM_BUILD_DIR}/config.status"
if test -e ${index} -a \
-e ${config_status} -a \
${config_status} -nt ${index}
then
msg "not reconfiguring LLVM, config.status is fresh"
do_reconfigure=0
fi
done
2011-11-11 00:54:31 +01:00
fi
if [ ${do_reconfigure} -ne 0 ]
then
# LLVM's configure doesn't recognize the new Windows triples yet
gnu_t=$(to_gnu_triple $t)
msg "configuring LLVM for $gnu_t"
2015-01-10 04:49:54 +01:00
LLVM_TARGETS="--enable-targets=x86,x86_64,arm,aarch64,mips,powerpc"
LLVM_BUILD="--build=$gnu_t"
LLVM_HOST="--host=$gnu_t"
LLVM_TARGET="--target=$gnu_t"
# Disable unused LLVM features
LLVM_OPTS="$LLVM_DBG_OPTS $LLVM_ASSERTION_OPTS --disable-docs --enable-bindings=none"
# Disable term-info, linkage of which comes in multiple forms,
# making our snapshots incompatible (#9334)
LLVM_OPTS="$LLVM_OPTS --disable-terminfo"
# Try to have LLVM pull in as few dependencies as possible (#9397)
LLVM_OPTS="$LLVM_OPTS --disable-zlib --disable-libffi"
# Use win32 native thread/lock apis instead of pthread wrapper.
# (llvm's configure tries to find pthread first, so we have to disable it explicitly.)
# Also note that pthreads works badly on mingw-w64 systems: #8996
case "$CFG_BUILD" in
(*-windows-*)
LLVM_OPTS="$LLVM_OPTS --disable-pthreads"
;;
esac
Make configure respect (and save) values for `CC`, `CXX`, `CFLAGS`, etc. I mostly tried to remain backwards compatible with old invocations of the `configure` script; if you do not want to use `CC` et al., you should not have to; you can keep using `--enable-clang` and/or `--enable-ccache`. The overall intention is to capture the following precedences for guessing the C compiler: 1. Value of `CC` at make invocation time. 2. Value of `CC` at configure invocation time. 3. Compiler inferred at configure invocation time (`gcc` or `clang`). The strategy is to check (at `configure` time) if each of the environment variables is set, and if so, save its value in a corresponding `CFG_` variable (e.g. `CFG_CC`). Then, in the makefiles, if `CC` is not set but `CFG_CC` is, then we use the `CFG_CC` setting as `CC`. Also, I fold the potential user-provided `CFLAGS` and `CXXFLAGS` values into all of the per-platform `CFLAGS` and `CXXFLAGS` settings. (This was opposed to adding `$(CFLAGS)` in an ad-hoc manner to various parts of the mk files.) Fix #13805. ---- Note that if you try to set the compiler to clang via the `CC` and `CXX` environment variables, you will probably need to also set `CXXFLAGS` to `--enable-libcpp` so that LLVM will be configured properly. ---- Introduce CFG_USING_CLANG, which is distinguished from CFG_ENABLE_CLANG because the former represents "we think we're using clang, choose appropriate warning-control options" while the latter represents "we asked configure (or the host required) that we attempt to use clang, so check that we have an appropriate version of clang." The main reason I added this is that I wanted to allow the user to choose clang via setting the `CC` environment variable, but I did not want that method of selection to get confused with the user passing the `--enable-clang` option. ---- A digression: The `configure` script does not infer the compiler setting if `CC` is set; but if `--enable-clang` was passed, then it *does* still attempt to validate that the clang version is compatible. Supporting this required revising `CLANG_VERSION` check to be robust in face of user-provided `CC` value. In particular, on Travis, the `CC` is set to `gcc` and so the natural thing to do is to attempt to use `gcc` as the compiler, but Travis is also passing `--enable-clang` to configure. So, what is the right answer in the face of these contradictory requests? One approach would be to have `--enable-clang` supersede the setting for `CC` (and instead just call whatever we inferred for `CFG_CLANG`). That sounds maximally inflexible to me (pnkfelix): a developer requesting a `CC` value probably wants it respected, and should be able to set it to something else; it is harder for that developer to hack our configure script to change its inferred path to clang. A second approach would be to blindly use the `CC` value but keep going through the clang version check when `--enable-clang` is turned on. But on Travis (a Linux host), the `gcc` invocation won't print a clang version, so we would not get past the CLANG_VERSION check in that context. A third approach would be to never run the CLANG_VERSION check if `CC` is explicitly set. That is not a terrible idea; but if the user uses `CC` to pass in a path to some other version of clang that they want to test, probably should still send that through the `CLANG_VERSION` check. So in the end I (pnkfelix) took a fourth approach: do the CLANG_VERSION check if `CC` is unset *or* if `CC` is set to a string ending with `clang`. This way setting `CC` to things like `path/to/clang` or `ccache clang` will still go through the CLANG_VERSION check, while setting `CC` to `gcc` or some unknown compiler will skip the CLANG_VERSION check (regardless of whether the user passed --enable-clang to `configure`). ---- Drive-by fixes: * The call that sets `CFG_CLANG_VERSION` was quoting `"$CFG_CC"` in its invocation, but that does not play nicely with someone who sets `$CFG_CC` to e.g. `ccache clang`, since you do not want to intepret that whole string as a command. (On the other hand, a path with spaces might need the quoted invocation. Not sure which one of these corner use-cases is more important to support.) * Fix chk_cc error message to point user at `gcc` not `cc`.
2014-04-28 18:57:26 +02:00
case "$CFG_CC" in
("ccache clang")
LLVM_CXX_32="ccache clang++ -Qunused-arguments"
LLVM_CC_32="ccache clang -Qunused-arguments"
LLVM_CXX_64="ccache clang++ -Qunused-arguments"
LLVM_CC_64="ccache clang -Qunused-arguments"
;;
("clang")
LLVM_CXX_32="clang++ -Qunused-arguments"
LLVM_CC_32="clang -Qunused-arguments"
LLVM_CXX_64="clang++ -Qunused-arguments"
LLVM_CC_64="clang -Qunused-arguments"
;;
("ccache gcc")
LLVM_CXX_32="ccache g++"
LLVM_CC_32="ccache gcc"
LLVM_CXX_64="ccache g++"
LLVM_CC_64="ccache gcc"
;;
("gcc")
LLVM_CXX_32="g++"
LLVM_CC_32="gcc"
LLVM_CXX_64="g++"
LLVM_CC_64="gcc"
Make configure respect (and save) values for `CC`, `CXX`, `CFLAGS`, etc. I mostly tried to remain backwards compatible with old invocations of the `configure` script; if you do not want to use `CC` et al., you should not have to; you can keep using `--enable-clang` and/or `--enable-ccache`. The overall intention is to capture the following precedences for guessing the C compiler: 1. Value of `CC` at make invocation time. 2. Value of `CC` at configure invocation time. 3. Compiler inferred at configure invocation time (`gcc` or `clang`). The strategy is to check (at `configure` time) if each of the environment variables is set, and if so, save its value in a corresponding `CFG_` variable (e.g. `CFG_CC`). Then, in the makefiles, if `CC` is not set but `CFG_CC` is, then we use the `CFG_CC` setting as `CC`. Also, I fold the potential user-provided `CFLAGS` and `CXXFLAGS` values into all of the per-platform `CFLAGS` and `CXXFLAGS` settings. (This was opposed to adding `$(CFLAGS)` in an ad-hoc manner to various parts of the mk files.) Fix #13805. ---- Note that if you try to set the compiler to clang via the `CC` and `CXX` environment variables, you will probably need to also set `CXXFLAGS` to `--enable-libcpp` so that LLVM will be configured properly. ---- Introduce CFG_USING_CLANG, which is distinguished from CFG_ENABLE_CLANG because the former represents "we think we're using clang, choose appropriate warning-control options" while the latter represents "we asked configure (or the host required) that we attempt to use clang, so check that we have an appropriate version of clang." The main reason I added this is that I wanted to allow the user to choose clang via setting the `CC` environment variable, but I did not want that method of selection to get confused with the user passing the `--enable-clang` option. ---- A digression: The `configure` script does not infer the compiler setting if `CC` is set; but if `--enable-clang` was passed, then it *does* still attempt to validate that the clang version is compatible. Supporting this required revising `CLANG_VERSION` check to be robust in face of user-provided `CC` value. In particular, on Travis, the `CC` is set to `gcc` and so the natural thing to do is to attempt to use `gcc` as the compiler, but Travis is also passing `--enable-clang` to configure. So, what is the right answer in the face of these contradictory requests? One approach would be to have `--enable-clang` supersede the setting for `CC` (and instead just call whatever we inferred for `CFG_CLANG`). That sounds maximally inflexible to me (pnkfelix): a developer requesting a `CC` value probably wants it respected, and should be able to set it to something else; it is harder for that developer to hack our configure script to change its inferred path to clang. A second approach would be to blindly use the `CC` value but keep going through the clang version check when `--enable-clang` is turned on. But on Travis (a Linux host), the `gcc` invocation won't print a clang version, so we would not get past the CLANG_VERSION check in that context. A third approach would be to never run the CLANG_VERSION check if `CC` is explicitly set. That is not a terrible idea; but if the user uses `CC` to pass in a path to some other version of clang that they want to test, probably should still send that through the `CLANG_VERSION` check. So in the end I (pnkfelix) took a fourth approach: do the CLANG_VERSION check if `CC` is unset *or* if `CC` is set to a string ending with `clang`. This way setting `CC` to things like `path/to/clang` or `ccache clang` will still go through the CLANG_VERSION check, while setting `CC` to `gcc` or some unknown compiler will skip the CLANG_VERSION check (regardless of whether the user passed --enable-clang to `configure`). ---- Drive-by fixes: * The call that sets `CFG_CLANG_VERSION` was quoting `"$CFG_CC"` in its invocation, but that does not play nicely with someone who sets `$CFG_CC` to e.g. `ccache clang`, since you do not want to intepret that whole string as a command. (On the other hand, a path with spaces might need the quoted invocation. Not sure which one of these corner use-cases is more important to support.) * Fix chk_cc error message to point user at `gcc` not `cc`.
2014-04-28 18:57:26 +02:00
;;
(*)
msg "inferring LLVM_CXX/CC from CXX/CC = $CXX/$CC"
LLVM_CXX_32="$CXX"
LLVM_CC_32="$CC"
Make configure respect (and save) values for `CC`, `CXX`, `CFLAGS`, etc. I mostly tried to remain backwards compatible with old invocations of the `configure` script; if you do not want to use `CC` et al., you should not have to; you can keep using `--enable-clang` and/or `--enable-ccache`. The overall intention is to capture the following precedences for guessing the C compiler: 1. Value of `CC` at make invocation time. 2. Value of `CC` at configure invocation time. 3. Compiler inferred at configure invocation time (`gcc` or `clang`). The strategy is to check (at `configure` time) if each of the environment variables is set, and if so, save its value in a corresponding `CFG_` variable (e.g. `CFG_CC`). Then, in the makefiles, if `CC` is not set but `CFG_CC` is, then we use the `CFG_CC` setting as `CC`. Also, I fold the potential user-provided `CFLAGS` and `CXXFLAGS` values into all of the per-platform `CFLAGS` and `CXXFLAGS` settings. (This was opposed to adding `$(CFLAGS)` in an ad-hoc manner to various parts of the mk files.) Fix #13805. ---- Note that if you try to set the compiler to clang via the `CC` and `CXX` environment variables, you will probably need to also set `CXXFLAGS` to `--enable-libcpp` so that LLVM will be configured properly. ---- Introduce CFG_USING_CLANG, which is distinguished from CFG_ENABLE_CLANG because the former represents "we think we're using clang, choose appropriate warning-control options" while the latter represents "we asked configure (or the host required) that we attempt to use clang, so check that we have an appropriate version of clang." The main reason I added this is that I wanted to allow the user to choose clang via setting the `CC` environment variable, but I did not want that method of selection to get confused with the user passing the `--enable-clang` option. ---- A digression: The `configure` script does not infer the compiler setting if `CC` is set; but if `--enable-clang` was passed, then it *does* still attempt to validate that the clang version is compatible. Supporting this required revising `CLANG_VERSION` check to be robust in face of user-provided `CC` value. In particular, on Travis, the `CC` is set to `gcc` and so the natural thing to do is to attempt to use `gcc` as the compiler, but Travis is also passing `--enable-clang` to configure. So, what is the right answer in the face of these contradictory requests? One approach would be to have `--enable-clang` supersede the setting for `CC` (and instead just call whatever we inferred for `CFG_CLANG`). That sounds maximally inflexible to me (pnkfelix): a developer requesting a `CC` value probably wants it respected, and should be able to set it to something else; it is harder for that developer to hack our configure script to change its inferred path to clang. A second approach would be to blindly use the `CC` value but keep going through the clang version check when `--enable-clang` is turned on. But on Travis (a Linux host), the `gcc` invocation won't print a clang version, so we would not get past the CLANG_VERSION check in that context. A third approach would be to never run the CLANG_VERSION check if `CC` is explicitly set. That is not a terrible idea; but if the user uses `CC` to pass in a path to some other version of clang that they want to test, probably should still send that through the `CLANG_VERSION` check. So in the end I (pnkfelix) took a fourth approach: do the CLANG_VERSION check if `CC` is unset *or* if `CC` is set to a string ending with `clang`. This way setting `CC` to things like `path/to/clang` or `ccache clang` will still go through the CLANG_VERSION check, while setting `CC` to `gcc` or some unknown compiler will skip the CLANG_VERSION check (regardless of whether the user passed --enable-clang to `configure`). ---- Drive-by fixes: * The call that sets `CFG_CLANG_VERSION` was quoting `"$CFG_CC"` in its invocation, but that does not play nicely with someone who sets `$CFG_CC` to e.g. `ccache clang`, since you do not want to intepret that whole string as a command. (On the other hand, a path with spaces might need the quoted invocation. Not sure which one of these corner use-cases is more important to support.) * Fix chk_cc error message to point user at `gcc` not `cc`.
2014-04-28 18:57:26 +02:00
LLVM_CXX_64="$CXX"
LLVM_CC_64="$CC"
;;
esac
case "$CFG_CPUTYPE" in
(x86*)
LLVM_CXX_32="$LLVM_CXX_32 -m32"
LLVM_CC_32="$LLVM_CC_32 -m32"
LLVM_CFLAGS_32="-m32"
LLVM_CXXFLAGS_32="-m32"
LLVM_LDFLAGS_32="-m32"
LLVM_CFLAGS_64=""
LLVM_CXXFLAGS_64=""
LLVM_LDFLAGS_64=""
LLVM_CXX_32="$LLVM_CXX_32 -m32"
LLVM_CC_32="$LLVM_CC_32 -m32"
;;
(*)
LLVM_CFLAGS_32=""
LLVM_CXXFLAGS_32=""
LLVM_LDFLAGS_32=""
LLVM_CFLAGS_64=""
LLVM_CXXFLAGS_64=""
LLVM_LDFLAGS_64=""
;;
esac
if echo $t | grep -q x86_64
then
LLVM_CXX=$LLVM_CXX_64
LLVM_CC=$LLVM_CC_64
LLVM_CFLAGS=$LLVM_CFLAGS_64
LLVM_CXXFLAGS=$LLVM_CXXFLAGS_64
LLVM_LDFLAGS=$LLVM_LDFLAGS_64
else
LLVM_CXX=$LLVM_CXX_32
LLVM_CC=$LLVM_CC_32
LLVM_CFLAGS=$LLVM_CFLAGS_32
LLVM_CXXFLAGS=$LLVM_CXXFLAGS_32
LLVM_LDFLAGS=$LLVM_LDFLAGS_32
fi
CXX=$LLVM_CXX
CC=$LLVM_CC
CFLAGS=$LLVM_CFLAGS
CXXFLAGS=$LLVM_CXXFLAGS
LDFLAGS=$LLVM_LDFLAGS
if [ -z "$CFG_DISABLE_LIBCPP" ] && [ -n "$CFG_USING_CLANG" ]; then
LLVM_OPTS="$LLVM_OPTS --enable-libcpp"
fi
LLVM_FLAGS="$LLVM_TARGETS $LLVM_OPTS $LLVM_BUILD \
$LLVM_HOST $LLVM_TARGET --with-python=$CFG_PYTHON"
msg "configuring LLVM with:"
msg "$LLVM_FLAGS"
export CXX
export CC
export CFLAGS
export CXXFLAGS
export LDFLAGS
cd $LLVM_BUILD_DIR
case $CFG_SRC_DIR in
/* | [a-z]:* | [A-Z]:*)
${CFG_LLVM_SRC_DIR}configure $LLVM_FLAGS
;;
*)
${CFG_BUILD_DIR}${CFG_LLVM_SRC_DIR}configure \
$LLVM_FLAGS
;;
esac
need_ok "LLVM configure failed"
cd $CFG_BUILD_DIR
fi
2011-11-01 23:22:07 +01:00
# Construct variables for LLVM build and install directories for
# each target. These will be named
# CFG_LLVM_BUILD_DIR_${target_triple} but all the hyphens in
# target_triple will be converted to underscore, because bash
# variables can't contain hyphens. The makefile will then have to
# convert back.
CFG_LLVM_BUILD_DIR=$(echo CFG_LLVM_BUILD_DIR_${t} | tr - _)
CFG_LLVM_INST_DIR=$(echo CFG_LLVM_INST_DIR_${t} | tr - _)
eval ${CFG_LLVM_BUILD_DIR}="'$LLVM_BUILD_DIR'"
eval ${CFG_LLVM_INST_DIR}="'$LLVM_INST_DIR'"
2011-11-03 22:13:22 +01:00
done
step_msg "writing configuration"
putvar CFG_SRC_DIR
putvar CFG_BUILD_DIR
putvar CFG_OSTYPE
putvar CFG_CPUTYPE
putvar CFG_CONFIGURE_ARGS
putvar CFG_PREFIX
2013-10-21 11:18:21 +02:00
putvar CFG_HOST
putvar CFG_TARGET
putvar CFG_LIBDIR_RELATIVE
2012-02-29 20:48:29 +01:00
putvar CFG_DISABLE_MANAGE_SUBMODULES
putvar CFG_ANDROID_CROSS_PATH
2013-10-21 11:18:21 +02:00
putvar CFG_MANDIR
# Avoid spurious warnings from clang by feeding it original source on
# ccache-miss rather than preprocessed input.
Make configure respect (and save) values for `CC`, `CXX`, `CFLAGS`, etc. I mostly tried to remain backwards compatible with old invocations of the `configure` script; if you do not want to use `CC` et al., you should not have to; you can keep using `--enable-clang` and/or `--enable-ccache`. The overall intention is to capture the following precedences for guessing the C compiler: 1. Value of `CC` at make invocation time. 2. Value of `CC` at configure invocation time. 3. Compiler inferred at configure invocation time (`gcc` or `clang`). The strategy is to check (at `configure` time) if each of the environment variables is set, and if so, save its value in a corresponding `CFG_` variable (e.g. `CFG_CC`). Then, in the makefiles, if `CC` is not set but `CFG_CC` is, then we use the `CFG_CC` setting as `CC`. Also, I fold the potential user-provided `CFLAGS` and `CXXFLAGS` values into all of the per-platform `CFLAGS` and `CXXFLAGS` settings. (This was opposed to adding `$(CFLAGS)` in an ad-hoc manner to various parts of the mk files.) Fix #13805. ---- Note that if you try to set the compiler to clang via the `CC` and `CXX` environment variables, you will probably need to also set `CXXFLAGS` to `--enable-libcpp` so that LLVM will be configured properly. ---- Introduce CFG_USING_CLANG, which is distinguished from CFG_ENABLE_CLANG because the former represents "we think we're using clang, choose appropriate warning-control options" while the latter represents "we asked configure (or the host required) that we attempt to use clang, so check that we have an appropriate version of clang." The main reason I added this is that I wanted to allow the user to choose clang via setting the `CC` environment variable, but I did not want that method of selection to get confused with the user passing the `--enable-clang` option. ---- A digression: The `configure` script does not infer the compiler setting if `CC` is set; but if `--enable-clang` was passed, then it *does* still attempt to validate that the clang version is compatible. Supporting this required revising `CLANG_VERSION` check to be robust in face of user-provided `CC` value. In particular, on Travis, the `CC` is set to `gcc` and so the natural thing to do is to attempt to use `gcc` as the compiler, but Travis is also passing `--enable-clang` to configure. So, what is the right answer in the face of these contradictory requests? One approach would be to have `--enable-clang` supersede the setting for `CC` (and instead just call whatever we inferred for `CFG_CLANG`). That sounds maximally inflexible to me (pnkfelix): a developer requesting a `CC` value probably wants it respected, and should be able to set it to something else; it is harder for that developer to hack our configure script to change its inferred path to clang. A second approach would be to blindly use the `CC` value but keep going through the clang version check when `--enable-clang` is turned on. But on Travis (a Linux host), the `gcc` invocation won't print a clang version, so we would not get past the CLANG_VERSION check in that context. A third approach would be to never run the CLANG_VERSION check if `CC` is explicitly set. That is not a terrible idea; but if the user uses `CC` to pass in a path to some other version of clang that they want to test, probably should still send that through the `CLANG_VERSION` check. So in the end I (pnkfelix) took a fourth approach: do the CLANG_VERSION check if `CC` is unset *or* if `CC` is set to a string ending with `clang`. This way setting `CC` to things like `path/to/clang` or `ccache clang` will still go through the CLANG_VERSION check, while setting `CC` to `gcc` or some unknown compiler will skip the CLANG_VERSION check (regardless of whether the user passed --enable-clang to `configure`). ---- Drive-by fixes: * The call that sets `CFG_CLANG_VERSION` was quoting `"$CFG_CC"` in its invocation, but that does not play nicely with someone who sets `$CFG_CC` to e.g. `ccache clang`, since you do not want to intepret that whole string as a command. (On the other hand, a path with spaces might need the quoted invocation. Not sure which one of these corner use-cases is more important to support.) * Fix chk_cc error message to point user at `gcc` not `cc`.
2014-04-28 18:57:26 +02:00
if [ ! -z "$CFG_ENABLE_CCACHE" ] && [ ! -z "$CFG_USING_CLANG" ]
then
CFG_CCACHE_CPP2=1
putvar CFG_CCACHE_CPP2
fi
if [ ! -z "$CFG_ENABLE_CCACHE" ]
then
CFG_CCACHE_BASEDIR=${CFG_SRC_DIR}
putvar CFG_CCACHE_BASEDIR
fi
if [ ! -z $BAD_PANDOC ]
then
CFG_PANDOC=
putvar CFG_PANDOC
fi
2011-11-03 22:13:22 +01:00
putvar CFG_LLVM_SRC_DIR
2013-10-21 11:18:21 +02:00
for t in $CFG_HOST
2011-11-03 22:13:22 +01:00
do
CFG_LLVM_BUILD_DIR=$(echo CFG_LLVM_BUILD_DIR_${t} | tr - _)
CFG_LLVM_INST_DIR=$(echo CFG_LLVM_INST_DIR_${t} | tr - _)
putvar $CFG_LLVM_BUILD_DIR
putvar $CFG_LLVM_INST_DIR
done
2011-11-01 23:22:07 +01:00
# Munge any paths that appear in config.mk back to posix-y
cp config.tmp config.tmp.bak
sed -e 's@ \([a-zA-Z]\):[/\\]@ /\1/@g;' <config.tmp.bak >config.tmp
rm -f config.tmp.bak
2011-11-03 22:13:22 +01:00
msg
copy_if_changed ${CFG_SRC_DIR}Makefile.in ./Makefile
move_if_changed config.tmp config.mk
rm -f config.tmp
touch config.stamp
if [ -z "$CFG_ENABLE_DEBUG" ]; then
step_msg "configured in release mode. for development consider --enable-debug"
else
step_msg "complete"
fi
2014-02-15 04:17:50 +01:00
msg "run \`make help\`"
2014-02-14 12:34:18 +01:00
msg