#! /bin/sh
#
# Update a local Subversion, Git or Mercurial tree from the GCC
# repository, with an emphasis on treating generated files correctly, so
# that autoconf, gperf et al are not required for the ``end'' user.
#
# (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010
# Free Software Foundation
# Originally by Gerald Pfeifer <pfeifer@dbai.tuwien.ac.at>, August 1998.
#
# This script is Free Software, and it can be copied, distributed and
# modified as defined in the GNU General Public License.  A copy of
# its license can be downloaded from http://www.gnu.org/copyleft/gpl.html
#
#
# By default all command-line options are passed to `svn update` or `hg/git
# pull` in addition to $UPDATE_OPTIONS (defined below). If the first parameter
# reads --nostdflags, $UPDATE_OPTIONS as well as this parameter itself
# are omitted.
#
# If the first parameter reads --patch, the second parameter is considered
# a patch file.
#
# If the first parameter is --touch, no svn operation will be performed,
# only generated files that appear to be out of date in the local tree
# will be touched.
#
# If the first parameter is --list, a list of the generated files and
# their dependencies will be printed; --help prints this message.
#
# If the first parameter is --silent, this script prints nothing other
# than error messages; the second parameter is then interpreted as above.
#
# Examples:
#
# contrib/gcc_update -r 8712
# contrib/gcc_update --patch some-patch
# contrib/gcc_update --touch
# contrib/gcc_update --list


# Default options used when updating (none).
UPDATE_OPTIONS=""

# Set the locale to C to make this script work for users with foreign
# locale like e.g. French UTF-8.
LANG=C
LC_ALL=C
export LANG LC_ALL

######## Anything below shouldn't be changed by regular users.

# Arrange for the value of $0 to be available for functions
self=$0

# This function prints its arguments to standard output unless
# "silent" is set.
unset silent
chat () {
    if [ -z "$silent" ]; then
        echo "$@"
    fi
}

# This function prints a list of all generated files, along with their
# dependencies.  Note that only one target is supported per line: the
# colon is stripped from the output.
files_and_dependencies () {
    sed -e 's/ *#.*//' -e '/^$/d' -e 's/://' <<\EOF
# fixincludes
fixincludes/configure: fixincludes/configure.ac fixincludes/aclocal.m4
fixincludes/config.h.in: fixincludes/configure.ac fixincludes/aclocal.m4
# intl library
intl/plural.c: intl/plural.y
intl/configure: intl/configure.ac intl/aclocal.m4
intl/config.h.in: intl/configure.ac intl/aclocal.m4
# Now, proceed to gcc automatically generated files
gcc/configure: gcc/configure.ac
gcc/cstamp-h.in: gcc/configure.ac
gcc/config.in: gcc/cstamp-h.in
gcc/fixinc/fixincl.x: gcc/fixinc/fixincl.tpl gcc/fixinc/inclhack.def
gcc/config/arm/arm-tune.md: gcc/config/arm/arm-cores.def gcc/config/arm/gentune.sh
# And then, language-specific files
gcc/cp/cfns.h: gcc/cp/cfns.gperf
gcc/java/keyword.h: gcc/java/keyword.gperf
# testsuite
# Without this, _Pragma3.c can have a false negative.
gcc/testsuite/gcc.dg/cpp/_Pragma3.c: gcc/testsuite/gcc.dg/cpp/mi1c.h
# Similarly, without this, you will see:
# direct2s.c:35: warning: current file is older than direct2.c
gcc/testsuite/gcc.dg/cpp/direct2s.c: gcc/testsuite/gcc.dg/cpp/direct2.c
# lto-plugin
lto-plugin/configure: lto-plugin/configure.ac lto-plugin/aclocal.m4
lto-plugin/Makefile.in: lto-plugin/Makefile.am lto-plugin/aclocal.m4
# And libraries, at last
libbanshee/configure: libbanshee/configure.ac
libmudflap/configure: libmudflap/configure.ac
libobjc/configure: libobjc/configure.ac
zlib/aclocal.m4: zlib/configure.ac zlib/acinclude.m4
zlib/Makefile.in: zlib/Makefile.am zlib/configure.ac zlib/aclocal.m4
zlib/configure: zlib/configure.ac zlib/aclocal.m4
fastjar/aclocal.m4: fastjar/configure.ac
fastjar/Makefile.in: fastjar/Makefile.am fastjar/configure.ac fastjar/aclocal.m4
fastjar/configure: fastjar/configure.ac fastjar/aclocal.m4
boehm-gc/aclocal.m4: boehm-gc/configure.ac
boehm-gc/Makefile.in: boehm-gc/Makefile.am boehm-gc/configure.ac boehm-gc/aclocal.m4
boehm-gc/configure: boehm-gc/configure.ac boehm-gc/aclocal.m4
libada/configure: libada/configure.ac
libffi/aclocal.m4: libffi/configure.ac libffi/acinclude.m4
libffi/Makefile.in: libffi/Makefile.am libffi/configure.ac libffi/aclocal.m4
libffi/configure: libffi/configure.ac libffi/aclocal.m4
libffi/fficonfig.h.in: libffi/configure.ac libffi/aclocal.m4
libgfortran/aclocal.m4: libgfortran/configure.ac libgfortran/acinclude.m4
libgfortran/Makefile.in: libgfortran/Makefile.am libgfortran/configure.ac libgfortran/aclocal.m4
libgfortran/configure: libgfortran/configure.ac libgfortran/aclocal.m4
libjava/aclocal.m4: libjava/configure.ac
libjava/Makefile.in: libjava/Makefile.am libjava/configure.ac libjava/aclocal.m4
libjava/configure: libjava/configure.ac libjava/aclocal.m4
libjava/libltdl/aclocal.m4: libjava/libltdl/configure.ac libjava/libltdl/acinclude.m4
libjava/libltdl/Makefile.in: libjava/libltdl/Makefile.am libjava/libltdl/configure.ac libjava/libltdl/aclocal.m4
libjava/libltdl/configure: libjava/libltdl/configure.ac libjava/libltdl/aclocal.m4
libjava/libltdl/config-h.in: libjava/libltdl/configure.ac libjava/libltdl/aclocal.m4
libcpp/aclocal.m4: libcpp/configure.ac
libcpp/Makefile.in: libcpp/configure.ac libcpp/aclocal.m4
libcpp/configure: libcpp/configure.ac libcpp/aclocal.m4
libgomp/aclocal.m4: libgomp/configure.ac libgomp/acinclude.m4
libgomp/Makefile.in: libgomp/Makefile.am libgomp/aclocal.m4
libgomp/testsuite/Makefile.in: libgomp/Makefile.am libgomp/aclocal.m4
libgomp/configure: libgomp/configure.ac libgomp/aclocal.m4
libgomp/config.h.in: libgomp/configure.ac libgomp/aclocal.m4
# Top level
Makefile.in: Makefile.tpl Makefile.def
configure: configure.ac config/acx.m4
EOF
}


# This function touches generated files such that the ``end'' user does
# not have to rebuild them.
touch_files () {
    rm -f Makefile.$$
    echo 'all: \' > Makefile.$$
    files_and_dependencies | sed 's, .*, \\,' >> Makefile.$$
    echo '; @true' >> Makefile.$$
    files_and_dependencies | sed 's, ,: ,' >> Makefile.$$
    files_and_dependencies | sed 's, .*, \\,' >> Makefile.$$
    echo ':' >> Makefile.$$
    echo '	@for f in $? $@; do test -f $$f || exit 0; done; \' >> Makefile.$$
    echo '	echo Touching $@...; \' >> Makefile.$$
    chat '	echo Touching $@... 1>&2; \' >> Makefile.$$
    echo '	touch $@' >> Makefile.$$
    files_and_dependencies | sed 's,[^ ]* ,,;s,$, :,' >> Makefile.$$

    # We would have to explicitly shut off the "Entering... Leaving..."
    # messages through "--no-print-directory" to handle the case when
    # we were called from a recursive invocation (i.e. "$(MAKE)" in a
    # Makefile, not just make).  Passing only "-s" doesn't help then,
    # because make has helpfully added "-w" to MAKEFLAGS automatically.
    # Unfortunately we do not require GNU make other than for building
    # and testing, so let's just grep known text explicitly echoed by
    # the rule.
    while ${MAKE-make} -s -f Makefile.$$ all | grep Touching > /dev/null; do
      sleep 1
    done 2>&1
    rm -f Makefile.$$
}


# Whenever we update the tree or install a patch, we may be modifying
# this script.  By re-execing it, we ensure that the appropriate
# dependencies and rules will be used.
touch_files_reexec () {
    chat "Adjusting file timestamps"
    exec ${CONFIG_SHELL-/bin/sh} $self ${silent+"--silent"} --touch
}

# This functions applies a patch to an existing tree.
apply_patch () {
    if [ -f "$1" ]; then
	echo "Applying patch file $1"
	case $1 in
	*gz)
	    gzip -d -c "$1" | patch -p1 ;;
	*bz2)
	    bzip2 -d -c "$1" | patch -p1 ;;
	*)
	    patch -p1 < "$1";;
	esac
    fi
    touch_files_reexec
}

# Check whether this indeed looks like a local tree.
if [ ! -f gcc/version.c ]; then
    echo "This does not seem to be a GCC tree!"
    exit
fi

case "$1" in
--silent)
    silent=t
    shift
    ;;
esac

case "$1" in
# First of all, check whether we are going to process a patch.
--patch)
    if test "$#" != 2; then
        echo "$1" expects only one argument >&2
	exit 1
    fi
    apply_patch "${2}"
    exit $?
    ;;

--touch)
    if test "$#" != 1; then
        echo "$1" does not expect any argument >&2
	exit 1
    fi
    touch_files
    exit $?
    ;;

--list)
    if test "$#" != 1; then
        echo "$1" does not expect any argument >&2
	exit 1
    fi
    files_and_dependencies | sed 's/ /: /'
    exit $?
    ;;

--help)
    sed -e '1,2d' -e '/^UPDATE_OPTIONS=/{i\
\

p
}' \
	-e '/^$/,$d' -e 's/#//' -e 's/^ //' < $0
    exit $?
    ;;

esac

# Check for known version control systems.
if [ -d .git ]; then
    GCC_GIT=${GCC_GIT-${GIT-git}}
    vcs_type="git"
elif [ -d .hg ]; then
    GCC_HG=${GCC_HG-${HG-hg}}
    vcs_type="hg"
elif [ -d .svn ]; then
    GCC_SVN=${GCC_SVN-${SVN-svn}}
    vcs_type="svn"
else
    echo "This does not seem to be a GCC GIT/HG/SVN tree!"
    exit
fi

# Check command-line options
if [ x"${1}"x = x"--nostdflags"x ]; then
    shift
else
    set -- $UPDATE_OPTIONS ${1+"$@"}
fi

case $vcs_type in
    git)
	chat "Updating GIT tree"

	$GCC_GIT diff --quiet --exit-code HEAD
	if [ $? -ne 0 ]; then
            echo "Attempting to update a dirty git tree!" >&2
            echo "Commit or stash your changes first and retry." >&2
            exit 1
	fi

	$GCC_GIT pull ${silent+-q} --rebase ${1+"$@"}
	if [ $? -ne 0 ]; then
            (touch_files_reexec)
            echo "git pull of full tree failed." >&2
            exit 1
	fi

	revision=`$GCC_GIT log -n1 --pretty=%p:%t:%H`
	branch=`$GCC_GIT name-rev --name-only HEAD || :`
	;;    

    hg)
	chat "Updating HG tree"

	# Add -q so untracked files aren't listed.
	if [ `$GCC_HG status -q | wc -l` -gt 0 ]; then
            echo "Attempting to update a dirty hg tree!" >&2
            echo "Commit or revert your changes first and retry." >&2
            exit 1
	fi

	# Check for mq extension.  mq patches must be popped so tip has
	# been converted from the SVN tree.
	if [ -d .hg/patches ] && [ `$GCC_HG qapplied | wc -l` -gt 0 ]; then
	    # FIXME: Perhaps pop queue instead?  We could do that since we
	    # know the tree is clean.
	    echo "Attempting to update hg tree with mq patches applied!" >&2
	    echo "Pop your patches first and retry." >&2
	    exit 1
	fi

	# Update tree, but make sure to only pull the default branch.
	# Otherwise all branches in the upstream repo are added, even if
	# only a single one has been cloned.
	$GCC_HG pull -u ${silent+-q} -r`$GCC_HG branch` ${1+"$@"}
	if [ $? -ne 0 ]; then
            (touch_files_reexec)
            echo "hg pull of full tree failed." >&2
            exit 1
	fi

	# Extract SVN revision corresponding to tip, as stored by hg convert.
	# Before hg 1.4.3, there's no template keyword corresponding to the
	# extra: tag, so need to use hg log --debug to extract the info.
	revision=`$GCC_HG log --debug -l1 | \
	    sed -ne "/^extra:.*convert_revision=svn:/ {
	        s%^.*@%%
		p
	    }"`
	branch=`$GCC_HG branch`
	# trunk in SVN parlance shows up as default branch in hg.
	[ x$branch = x"default" ] && branch="trunk"
	;;

    svn)
	chat "Updating SVN tree"

	$GCC_SVN ${silent+-q}  --non-interactive update ${1+"$@"}
	if [ $? -ne 0 ]; then
	    (touch_files_reexec)
	    echo "SVN update of full tree failed." >&2
	    exit 1
	fi

	revision=`svn info | awk '/Revision:/ { print $2 }'`
	branch=`svn info | sed -ne "/URL:/ {
	    s,.*/trunk,trunk,
	    s,.*/branches/,,
	    s,.*/tags/,,
	    p
	}"`
	;;
esac

rm -f LAST_UPDATED gcc/REVISION
{
    date
    echo "`TZ=UTC date` (revision $revision)"
} > LAST_UPDATED
echo "[$branch revision $revision]" > gcc/REVISION

touch_files_reexec