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rust/mk/rt.mk
Alex Crichton ee6011fc71 mk: Stop using cmake for compiler-rt 
The compiler-rt build system has been a never ending cause of pain for Rust
unfortunately:

* The build system is very difficult to invoke and configure to only build
  compiler-rt, especially across platforms.
* The standard build system doesn't actually do what we want, not working for
  some of our platforms and requiring a significant number of patches on our end
  which are difficult to apply when updating compiler-rt.
* Compiling compiler-rt requires LLVM to be compiled, which... is a big
  dependency! This also means that over time compiler-rt is not guaranteed to
  build against older versions of LLVM (or newer versions), and we often want to
  work with multiple versions of LLVM simultaneously.

The makefiles and rustbuild already know how to compile C code, the code here is
far from the *only* C code we're compiling. This patch jettisons all logic to
work with compiler-rt's build system and just goes straight to the source. We
just list all files manually (copied from compiler-rt's
lib/builtins/CMakeLists.txt) and compile them into an archive.

It's likely that this means we'll fail to pick up new files when we upgrade
compiler-rt, but that seems like a much less significant cost to pay than what
we're currently paying.

cc #34400, first steps towards that
2016-07-20 13:22:20 -07:00

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Makefile
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# Copyright 2014 The Rust Project Developers. See the COPYRIGHT
# file at the top-level directory of this distribution and at
# http://rust-lang.org/COPYRIGHT.
#
# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
# option. This file may not be copied, modified, or distributed
# except according to those terms.
################################################################################
# Native libraries built as part of the rust build process
#
# This portion of the rust build system is meant to keep track of native
# dependencies and how to build them. It is currently required that all native
# dependencies are built as static libraries, as slinging around dynamic
# libraries isn't exactly the most fun thing to do.
#
# This section should need minimal modification to add new libraries. The
# relevant variables are:
#
# NATIVE_LIBS
# This is a list of all native libraries which are built as part of the
# build process. It will build all libraries into RT_OUTPUT_DIR with the
# appropriate name of static library as dictated by the target platform
#
# NATIVE_DEPS_<lib>
# This is a list of files relative to the src/rt directory which are
# needed to build the native library. Each file will be compiled to an
# object file, and then all the object files will be assembled into an
# archive (static library). The list contains files of any extension
#
# If adding a new library, you should update the NATIVE_LIBS list, and then list
# the required files below it. The list of required files is a list of files
# that's per-target so you're allowed to conditionally add files based on the
# target.
################################################################################
NATIVE_LIBS := hoedown miniz rust_test_helpers
# $(1) is the target triple
define NATIVE_LIBRARIES
NATIVE_DEPS_hoedown_$(1) := hoedown/src/autolink.c \
hoedown/src/buffer.c \
hoedown/src/document.c \
hoedown/src/escape.c \
hoedown/src/html.c \
hoedown/src/html_blocks.c \
hoedown/src/html_smartypants.c \
hoedown/src/stack.c \
hoedown/src/version.c
NATIVE_DEPS_miniz_$(1) = miniz.c
NATIVE_DEPS_rust_test_helpers_$(1) := rust_test_helpers.c
################################################################################
# You shouldn't find it that necessary to edit anything below this line.
################################################################################
# While we're defining the native libraries for each target, we define some
# common rules used to build files for various targets.
RT_OUTPUT_DIR_$(1) := $(1)/rt
$$(RT_OUTPUT_DIR_$(1))/%.o: $(S)src/rt/%.c $$(MKFILE_DEPS)
@mkdir -p $$(@D)
@$$(call E, compile: $$@)
$$(Q)$$(call CFG_COMPILE_C_$(1), $$@, \
$$(call CFG_CC_INCLUDE_$(1),$$(S)src/rt/hoedown/src) \
$$(call CFG_CC_INCLUDE_$(1),$$(S)src/rt) \
$$(RUNTIME_CFLAGS_$(1))) $$<
$$(RT_OUTPUT_DIR_$(1))/%.o: $(S)src/rt/%.S $$(MKFILE_DEPS) \
$$(LLVM_CONFIG_$$(CFG_BUILD))
@mkdir -p $$(@D)
@$$(call E, compile: $$@)
$$(Q)$$(call CFG_ASSEMBLE_$(1),$$@,$$<)
# On MSVC targets the compiler's default include path (e.g. where to find system
# headers) is specified by the INCLUDE environment variable. This may not be set
# so the ./configure script scraped the relevant values and this is the location
# that we put them into cl.exe's environment.
ifeq ($$(findstring msvc,$(1)),msvc)
$$(RT_OUTPUT_DIR_$(1))/%.o: \
export INCLUDE := $$(CFG_MSVC_INCLUDE_PATH_$$(HOST_$(1)))
$(1)/rustllvm/%.o: \
export INCLUDE := $$(CFG_MSVC_INCLUDE_PATH_$$(HOST_$(1)))
endif
endef
$(foreach target,$(CFG_TARGET),$(eval $(call NATIVE_LIBRARIES,$(target))))
# A macro for devining how to build third party libraries listed above (based
# on their dependencies).
#
# $(1) is the target
# $(2) is the lib name
define THIRD_PARTY_LIB
OBJS_$(2)_$(1) := $$(NATIVE_DEPS_$(2)_$(1):%=$$(RT_OUTPUT_DIR_$(1))/%)
OBJS_$(2)_$(1) := $$(OBJS_$(2)_$(1):.c=.o)
OBJS_$(2)_$(1) := $$(OBJS_$(2)_$(1):.cpp=.o)
OBJS_$(2)_$(1) := $$(OBJS_$(2)_$(1):.S=.o)
NATIVE_$(2)_$(1) := $$(call CFG_STATIC_LIB_NAME_$(1),$(2))
$$(RT_OUTPUT_DIR_$(1))/$$(NATIVE_$(2)_$(1)): $$(OBJS_$(2)_$(1))
@$$(call E, link: $$@)
$$(Q)$$(call CFG_CREATE_ARCHIVE_$(1),$$@) $$^
endef
$(foreach target,$(CFG_TARGET), \
$(eval $(call RUNTIME_RULES,$(target))))
$(foreach lib,$(NATIVE_LIBS), \
$(foreach target,$(CFG_TARGET), \
$(eval $(call THIRD_PARTY_LIB,$(target),$(lib)))))
################################################################################
# Building third-party targets with external build systems
#
# This location is meant for dependencies which have external build systems. It
# is still assumed that the output of each of these steps is a static library
# in the correct location.
################################################################################
define DEF_THIRD_PARTY_TARGETS
# $(1) is the target triple
ifeq ($$(CFG_WINDOWSY_$(1)),1)
# A bit of history here, this used to be --enable-lazy-lock added in #14006
# which was filed with jemalloc in jemalloc/jemalloc#83 which was also
# reported to MinGW: http://sourceforge.net/p/mingw-w64/bugs/395/
#
# When updating jemalloc to 4.0, however, it was found that binaries would
# exit with the status code STATUS_RESOURCE_NOT_OWNED indicating that a thread
# was unlocking a mutex it never locked. Disabling this "lazy lock" option
# seems to fix the issue, but it was enabled by default for MinGW targets in
# 13473c7 for jemalloc.
#
# As a result of all that, force disabling lazy lock on Windows, and after
# reading some code it at least *appears* that the initialization of mutexes
# is otherwise ok in jemalloc, so shouldn't cause problems hopefully...
#
# tl;dr: make windows behave like other platforms by disabling lazy locking,
# but requires passing an option due to a historical default with
# jemalloc.
JEMALLOC_ARGS_$(1) := --disable-lazy-lock
else ifeq ($(OSTYPE_$(1)), apple-ios)
JEMALLOC_ARGS_$(1) := --disable-tls
else ifeq ($(findstring android, $(OSTYPE_$(1))), android)
# We force android to have prefixed symbols because apparently replacement of
# the libc allocator doesn't quite work. When this was tested (unprefixed
# symbols), it was found that the `realpath` function in libc would allocate
# with libc malloc (not jemalloc malloc), and then the standard library would
# free with jemalloc free, causing a segfault.
#
# If the test suite passes, however, without symbol prefixes then we should be
# good to go!
JEMALLOC_ARGS_$(1) := --disable-tls --with-jemalloc-prefix=je_
else ifeq ($(findstring dragonfly, $(OSTYPE_$(1))), dragonfly)
JEMALLOC_ARGS_$(1) := --with-jemalloc-prefix=je_
endif
ifdef CFG_ENABLE_DEBUG_JEMALLOC
JEMALLOC_ARGS_$(1) += --enable-debug --enable-fill
endif
################################################################################
# jemalloc
################################################################################
ifdef CFG_ENABLE_FAST_MAKE
JEMALLOC_DEPS := $(S)/.gitmodules
else
JEMALLOC_DEPS := $(wildcard \
$(S)src/jemalloc/* \
$(S)src/jemalloc/*/* \
$(S)src/jemalloc/*/*/* \
$(S)src/jemalloc/*/*/*/*)
endif
# See #17183 for details, this file is touched during the build process so we
# don't want to consider it as a dependency.
JEMALLOC_DEPS := $(filter-out $(S)src/jemalloc/VERSION,$(JEMALLOC_DEPS))
JEMALLOC_NAME_$(1) := $$(call CFG_STATIC_LIB_NAME_$(1),jemalloc)
ifeq ($$(CFG_WINDOWSY_$(1)),1)
JEMALLOC_REAL_NAME_$(1) := $$(call CFG_STATIC_LIB_NAME_$(1),jemalloc_s)
else
JEMALLOC_REAL_NAME_$(1) := $$(call CFG_STATIC_LIB_NAME_$(1),jemalloc_pic)
endif
JEMALLOC_LIB_$(1) := $$(RT_OUTPUT_DIR_$(1))/$$(JEMALLOC_NAME_$(1))
JEMALLOC_BUILD_DIR_$(1) := $$(RT_OUTPUT_DIR_$(1))/jemalloc
JEMALLOC_LOCAL_$(1) := $$(JEMALLOC_BUILD_DIR_$(1))/lib/$$(JEMALLOC_REAL_NAME_$(1))
$$(JEMALLOC_LOCAL_$(1)): $$(JEMALLOC_DEPS) $$(MKFILE_DEPS)
@$$(call E, make: jemalloc)
cd "$$(JEMALLOC_BUILD_DIR_$(1))"; "$(S)src/jemalloc/configure" \
$$(JEMALLOC_ARGS_$(1)) $(CFG_JEMALLOC_FLAGS) \
--build=$$(CFG_GNU_TRIPLE_$(CFG_BUILD)) --host=$$(CFG_GNU_TRIPLE_$(1)) \
CC="$$(CC_$(1)) $$(CFG_JEMALLOC_CFLAGS_$(1))" \
AR="$$(AR_$(1))" \
RANLIB="$$(AR_$(1)) s" \
CPPFLAGS="-I $(S)src/rt/" \
EXTRA_CFLAGS="-g1 -ffunction-sections -fdata-sections"
$$(Q)$$(MAKE) -C "$$(JEMALLOC_BUILD_DIR_$(1))" build_lib_static
ifeq ($(1),$$(CFG_BUILD))
ifneq ($$(CFG_JEMALLOC_ROOT),)
$$(JEMALLOC_LIB_$(1)): $$(CFG_JEMALLOC_ROOT)/libjemalloc_pic.a
@$$(call E, copy: jemalloc)
$$(Q)cp $$< $$@
else
$$(JEMALLOC_LIB_$(1)): $$(JEMALLOC_LOCAL_$(1))
$$(Q)cp $$< $$@
endif
else
$$(JEMALLOC_LIB_$(1)): $$(JEMALLOC_LOCAL_$(1))
$$(Q)cp $$< $$@
endif
################################################################################
# compiler-rt
################################################################################
# Everything below is a manual compilation of compiler-rt, disregarding its
# build system. See comments in `src/bootstrap/native.rs` for more information.
COMPRT_NAME_$(1) := $$(call CFG_STATIC_LIB_NAME_$(1),compiler-rt)
COMPRT_LIB_$(1) := $$(RT_OUTPUT_DIR_$(1))/$$(COMPRT_NAME_$(1))
COMPRT_BUILD_DIR_$(1) := $$(RT_OUTPUT_DIR_$(1))/compiler-rt
# GENERIC_SOURCES in CMakeLists.txt
COMPRT_OBJS_$(1) := \
absvdi2.o \
absvsi2.o \
adddf3.o \
addsf3.o \
addvdi3.o \
addvsi3.o \
apple_versioning.o \
ashldi3.o \
ashrdi3.o \
clear_cache.o \
clzdi2.o \
clzsi2.o \
cmpdi2.o \
comparedf2.o \
comparesf2.o \
ctzdi2.o \
ctzsi2.o \
divdc3.o \
divdf3.o \
divdi3.o \
divmoddi4.o \
divmodsi4.o \
divsc3.o \
divsf3.o \
divsi3.o \
divxc3.o \
extendsfdf2.o \
extendhfsf2.o \
ffsdi2.o \
fixdfdi.o \
fixdfsi.o \
fixsfdi.o \
fixsfsi.o \
fixunsdfdi.o \
fixunsdfsi.o \
fixunssfdi.o \
fixunssfsi.o \
fixunsxfdi.o \
fixunsxfsi.o \
fixxfdi.o \
floatdidf.o \
floatdisf.o \
floatdixf.o \
floatsidf.o \
floatsisf.o \
floatundidf.o \
floatundisf.o \
floatundixf.o \
floatunsidf.o \
floatunsisf.o \
int_util.o \
lshrdi3.o \
moddi3.o \
modsi3.o \
muldc3.o \
muldf3.o \
muldi3.o \
mulodi4.o \
mulosi4.o \
muloti4.o \
mulsc3.o \
mulsf3.o \
mulvdi3.o \
mulvsi3.o \
mulxc3.o \
negdf2.o \
negdi2.o \
negsf2.o \
negvdi2.o \
negvsi2.o \
paritydi2.o \
paritysi2.o \
popcountdi2.o \
popcountsi2.o \
powidf2.o \
powisf2.o \
powixf2.o \
subdf3.o \
subsf3.o \
subvdi3.o \
subvsi3.o \
truncdfhf2.o \
truncdfsf2.o \
truncsfhf2.o \
ucmpdi2.o \
udivdi3.o \
udivmoddi4.o \
udivmodsi4.o \
udivsi3.o \
umoddi3.o \
umodsi3.o
ifeq ($$(findstring ios,$(1)),)
COMPRT_OBJS_$(1) += \
absvti2.o \
addtf3.o \
addvti3.o \
ashlti3.o \
ashrti3.o \
clzti2.o \
cmpti2.o \
ctzti2.o \
divtf3.o \
divti3.o \
ffsti2.o \
fixdfti.o \
fixsfti.o \
fixunsdfti.o \
fixunssfti.o \
fixunsxfti.o \
fixxfti.o \
floattidf.o \
floattisf.o \
floattixf.o \
floatuntidf.o \
floatuntisf.o \
floatuntixf.o \
lshrti3.o \
modti3.o \
multf3.o \
multi3.o \
mulvti3.o \
negti2.o \
negvti2.o \
parityti2.o \
popcountti2.o \
powitf2.o \
subtf3.o \
subvti3.o \
trampoline_setup.o \
ucmpti2.o \
udivmodti4.o \
udivti3.o \
umodti3.o
endif
ifeq ($$(findstring apple,$(1)),apple)
COMPRT_OBJS_$(1) += \
atomic_flag_clear.o \
atomic_flag_clear_explicit.o \
atomic_flag_test_and_set.o \
atomic_flag_test_and_set_explicit.o \
atomic_signal_fence.o \
atomic_thread_fence.o
endif
ifeq ($$(findstring windows,$(1)),)
COMPRT_OBJS_$(1) += emutls.o
endif
ifeq ($$(findstring msvc,$(1)),)
COMPRT_OBJS_$(1) += gcc_personality_v0.o
COMPRT_OBJS_$(1) += emutls.o
ifeq ($$(findstring x86_64,$(1)),x86_64)
COMPRT_OBJS_$(1) += \
x86_64/chkstk.o \
x86_64/chkstk2.o \
x86_64/floatdidf.o \
x86_64/floatdisf.o \
x86_64/floatdixf.o \
x86_64/floatundidf.o \
x86_64/floatundisf.o \
x86_64/floatundixf.o
endif
ifeq ($$(findstring i686,$$(patsubts i%86,i686,$(1))),i686)
COMPRT_OBJS_$(1) += \
i386/ashldi3.o \
i386/ashrdi3.o \
i386/chkstk.o \
i386/chkstk2.o \
i386/divdi3.o \
i386/floatdidf.o \
i386/floatdisf.o \
i386/floatdixf.o \
i386/floatundidf.o \
i386/floatundisf.o \
i386/floatundixf.o \
i386/lshrdi3.o \
i386/moddi3.o \
i386/muldi3.o \
i386/udivdi3.o \
i386/umoddi3.o
endif
else
ifeq ($$(findstring x86_64,$(1)),x86_64)
COMPRT_OBJS_$(1) += \
x86_64/floatdidf.o \
x86_64/floatdisf.o \
x86_64/floatdixf.o
endif
endif
# Generic ARM sources, nothing compiles on iOS though
ifeq ($$(findstring arm,$(1)),arm)
ifeq ($$(findstring ios,$(1)),)
COMPRT_OBJS_$(1) += \
arm/aeabi_cdcmp.o \
arm/aeabi_cdcmpeq_check_nan.o \
arm/aeabi_cfcmp.o \
arm/aeabi_cfcmpeq_check_nan.o \
arm/aeabi_dcmp.o \
arm/aeabi_div0.o \
arm/aeabi_drsub.o \
arm/aeabi_fcmp.o \
arm/aeabi_frsub.o \
arm/aeabi_idivmod.o \
arm/aeabi_ldivmod.o \
arm/aeabi_memcmp.o \
arm/aeabi_memcpy.o \
arm/aeabi_memmove.o \
arm/aeabi_memset.o \
arm/aeabi_uidivmod.o \
arm/aeabi_uldivmod.o \
arm/bswapdi2.o \
arm/bswapsi2.o \
arm/clzdi2.o \
arm/clzsi2.o \
arm/comparesf2.o \
arm/divmodsi4.o \
arm/divsi3.o \
arm/modsi3.o \
arm/switch16.o \
arm/switch32.o \
arm/switch8.o \
arm/switchu8.o \
arm/sync_synchronize.o \
arm/udivmodsi4.o \
arm/udivsi3.o \
arm/umodsi3.o
endif
endif
# Thumb sources
ifeq ($$(findstring armv7,$(1)),armv7)
COMPRT_OBJS_$(1) += \
arm/sync_fetch_and_add_4.o \
arm/sync_fetch_and_add_8.o \
arm/sync_fetch_and_and_4.o \
arm/sync_fetch_and_and_8.o \
arm/sync_fetch_and_max_4.o \
arm/sync_fetch_and_max_8.o \
arm/sync_fetch_and_min_4.o \
arm/sync_fetch_and_min_8.o \
arm/sync_fetch_and_nand_4.o \
arm/sync_fetch_and_nand_8.o \
arm/sync_fetch_and_or_4.o \
arm/sync_fetch_and_or_8.o \
arm/sync_fetch_and_sub_4.o \
arm/sync_fetch_and_sub_8.o \
arm/sync_fetch_and_umax_4.o \
arm/sync_fetch_and_umax_8.o \
arm/sync_fetch_and_umin_4.o \
arm/sync_fetch_and_umin_8.o \
arm/sync_fetch_and_xor_4.o \
arm/sync_fetch_and_xor_8.o
endif
# VFP sources
ifeq ($$(findstring eabihf,$(1)),eabihf)
COMPRT_OBJS_$(1) += \
arm/adddf3vfp.o \
arm/addsf3vfp.o \
arm/divdf3vfp.o \
arm/divsf3vfp.o \
arm/eqdf2vfp.o \
arm/eqsf2vfp.o \
arm/extendsfdf2vfp.o \
arm/fixdfsivfp.o \
arm/fixsfsivfp.o \
arm/fixunsdfsivfp.o \
arm/fixunssfsivfp.o \
arm/floatsidfvfp.o \
arm/floatsisfvfp.o \
arm/floatunssidfvfp.o \
arm/floatunssisfvfp.o \
arm/gedf2vfp.o \
arm/gesf2vfp.o \
arm/gtdf2vfp.o \
arm/gtsf2vfp.o \
arm/ledf2vfp.o \
arm/lesf2vfp.o \
arm/ltdf2vfp.o \
arm/ltsf2vfp.o \
arm/muldf3vfp.o \
arm/mulsf3vfp.o \
arm/negdf2vfp.o \
arm/negsf2vfp.o \
arm/nedf2vfp.o \
arm/nesf2vfp.o \
arm/restore_vfp_d8_d15_regs.o \
arm/save_vfp_d8_d15_regs.o \
arm/subdf3vfp.o \
arm/subsf3vfp.o \
arm/truncdfsf2vfp.o \
arm/unorddf2vfp.o \
arm/unordsf2vfp.o
endif
ifeq ($$(findstring aarch64,$(1)),aarch64)
COMPRT_OBJS_$(1) += \
comparetf2.o \
extenddftf2.o \
extendsftf2.o \
fixtfdi.o \
fixtfsi.o \
fixtfti.o \
fixunstfdi.o \
fixunstfsi.o \
fixunstfti.o \
floatditf.o \
floatsitf.o \
floatunditf.o \
floatunsitf.o \
multc3.o \
trunctfdf2.o \
trunctfsf2.o
endif
ifeq ($$(findstring msvc,$(1)),msvc)
$$(COMPRT_BUILD_DIR_$(1))/%.o: CFLAGS += -Zl -D__func__=__FUNCTION__
else
$$(COMPRT_BUILD_DIR_$(1))/%.o: CFLAGS += -fno-builtin -fvisibility=hidden \
-fomit-frame-pointer -ffreestanding
endif
COMPRT_OBJS_$(1) := $$(COMPRT_OBJS_$(1):%=$$(COMPRT_BUILD_DIR_$(1))/%)
$$(COMPRT_BUILD_DIR_$(1))/%.o: $(S)src/compiler-rt/lib/builtins/%.c
@mkdir -p $$(@D)
@$$(call E, compile: $$@)
$$(Q)$$(call CFG_COMPILE_C_$(1),$$@,$$<)
$$(COMPRT_BUILD_DIR_$(1))/%.o: $(S)src/compiler-rt/lib/builtins/%.S \
$$(LLVM_CONFIG_$$(CFG_BUILD))
@mkdir -p $$(@D)
@$$(call E, compile: $$@)
$$(Q)$$(call CFG_ASSEMBLE_$(1),$$@,$$<)
ifeq ($$(findstring msvc,$(1)),msvc)
$$(COMPRT_BUILD_DIR_$(1))/%.o: \
export INCLUDE := $$(CFG_MSVC_INCLUDE_PATH_$$(HOST_$(1)))
endif
ifeq ($$(findstring emscripten,$(1)),emscripten)
# FIXME: emscripten doesn't use compiler-rt and can't build it without
# further hacks
COMPRT_OBJS_$(1) :=
endif
$$(COMPRT_LIB_$(1)): $$(COMPRT_OBJS_$(1))
@$$(call E, link: $$@)
$$(Q)$$(call CFG_CREATE_ARCHIVE_$(1),$$@) $$^
################################################################################
# libbacktrace
#
# We use libbacktrace on linux to get symbols in backtraces, but only on linux.
# Elsewhere we use other system utilities, so this library is only built on
# linux.
################################################################################
BACKTRACE_NAME_$(1) := $$(call CFG_STATIC_LIB_NAME_$(1),backtrace)
BACKTRACE_LIB_$(1) := $$(RT_OUTPUT_DIR_$(1))/$$(BACKTRACE_NAME_$(1))
BACKTRACE_BUILD_DIR_$(1) := $$(RT_OUTPUT_DIR_$(1))/libbacktrace
# We don't use this on platforms that aren't linux-based (with the exception of
# msys2/mingw builds on windows, which use it to read the dwarf debug
# information) so just make the file available, the compilation of libstd won't
# actually build it.
ifeq ($$(findstring darwin,$$(OSTYPE_$(1))),darwin)
# See comment above
$$(BACKTRACE_LIB_$(1)):
touch $$@
else ifeq ($$(findstring ios,$$(OSTYPE_$(1))),ios)
# See comment above
$$(BACKTRACE_LIB_$(1)):
touch $$@
else ifeq ($$(findstring msvc,$(1)),msvc)
# See comment above
$$(BACKTRACE_LIB_$(1)):
touch $$@
else ifeq ($$(findstring emscripten,$(1)),emscripten)
# FIXME: libbacktrace doesn't understand the emscripten triple
$$(BACKTRACE_LIB_$(1)):
touch $$@
else
ifdef CFG_ENABLE_FAST_MAKE
BACKTRACE_DEPS := $(S)/.gitmodules
else
BACKTRACE_DEPS := $(wildcard $(S)src/libbacktrace/*)
endif
# We need to export CFLAGS because otherwise it doesn't pick up cross compile
# builds. If libbacktrace doesn't realize this, it will attempt to read 64-bit
# elf headers when compiled for a 32-bit system, yielding blank backtraces.
#
# This also removes the -Werror flag specifically to prevent errors during
# configuration.
#
# Down below you'll also see echos into the config.h generated by the
# ./configure script. This is done to force libbacktrace to *not* use the
# atomic/sync functionality because it pulls in unnecessary dependencies and we
# never use it anyway.
#
# We also use `env PWD=` to clear the PWD environment variable, and then
# execute the command in a new shell. This is necessary to workaround a
# buildbot/msys2 bug: the shell is launched with PWD set to a windows-style path,
# which results in all further uses of `pwd` also printing a windows-style path,
# which breaks libbacktrace's configure script. Clearing PWD within the same
# shell is not sufficient.
$$(BACKTRACE_BUILD_DIR_$(1))/Makefile: $$(BACKTRACE_DEPS) $$(MKFILE_DEPS)
@$$(call E, configure: libbacktrace for $(1))
$$(Q)rm -rf $$(BACKTRACE_BUILD_DIR_$(1))
$$(Q)mkdir -p $$(BACKTRACE_BUILD_DIR_$(1))
$$(Q)(cd $$(BACKTRACE_BUILD_DIR_$(1)) && env \
PWD= \
CC="$$(CC_$(1))" \
AR="$$(AR_$(1))" \
RANLIB="$$(AR_$(1)) s" \
CFLAGS="$$(CFG_GCCISH_CFLAGS_$(1)) -Wno-error -fno-stack-protector" \
$(S)src/libbacktrace/configure --build=$(CFG_GNU_TRIPLE_$(CFG_BUILD)) --host=$(CFG_GNU_TRIPLE_$(1)))
$$(Q)echo '#undef HAVE_ATOMIC_FUNCTIONS' >> \
$$(BACKTRACE_BUILD_DIR_$(1))/config.h
$$(Q)echo '#undef HAVE_SYNC_FUNCTIONS' >> \
$$(BACKTRACE_BUILD_DIR_$(1))/config.h
$$(BACKTRACE_LIB_$(1)): $$(BACKTRACE_BUILD_DIR_$(1))/Makefile $$(MKFILE_DEPS)
@$$(call E, make: libbacktrace)
$$(Q)$$(MAKE) -C $$(BACKTRACE_BUILD_DIR_$(1)) \
INCDIR=$(S)src/libbacktrace
$$(Q)cp $$(BACKTRACE_BUILD_DIR_$(1))/.libs/libbacktrace.a $$@
endif
################################################################################
# libc/libunwind for musl
#
# When we're building a musl-like target we're going to link libc/libunwind
# statically into the standard library and liblibc, so we need to make sure
# they're in a location that we can find
################################################################################
ifeq ($$(findstring musl,$(1)),musl)
$$(RT_OUTPUT_DIR_$(1))/%: $$(CFG_MUSL_ROOT)/lib/%
cp $$^ $$@
else
# Ask gcc where it is
$$(RT_OUTPUT_DIR_$(1))/%:
cp $$(shell $$(CC_$(1)) -print-file-name=$$(@F)) $$@
endif
endef
# Instantiate template for all stages/targets
$(foreach target,$(CFG_TARGET), \
$(eval $(call DEF_THIRD_PARTY_TARGETS,$(target))))
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