sync/atomic, runtime/internal/atomic: don't assume reads from 0 fail

[official-gcc.git] / contrib / gcc_update

#! /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, 2011, 2012, 2013, 2014, 2015, 2017 Free Software Foundation
# Originally by Gerald Pfeifer <gerald@pfeifer.com>, 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# only generated files that appear to be out of date in the local tree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/aarch64/aarch64-tune.md: gcc/config/aarch64/aarch64-cores.def gcc/config/aarch64/gentune.sh
gcc/config/arm/arm-tune.md: gcc/config/arm/arm-cpus.in gcc/config/arm/parsecpu.awk
gcc/config/arm/arm-tables.opt: gcc/config/arm/arm-cpus.in gcc/config/arm/parsecpu.awk
gcc/config/avr/t-multilib: gcc/config/avr/avr-mcus.def gcc/config/avr/genmultilib.awk
gcc/config/c6x/c6x-tables.opt: gcc/config/c6x/c6x-isas.def gcc/config/c6x/genopt.sh
gcc/config/c6x/c6x-sched.md: gcc/config/c6x/c6x-sched.md.in gcc/config/c6x/gensched.sh
gcc/config/c6x/c6x-mult.md: gcc/config/c6x/c6x-mult.md.in gcc/config/c6x/genmult.sh
gcc/config/m68k/m68k-tables.opt: gcc/config/m68k/m68k-devices.def gcc/config/m68k/m68k-isas.def gcc/config/m68k/m68k-microarchs.def gcc/config/m68k/genopt.sh
gcc/config/mips/mips-tables.opt: gcc/config/mips/mips-cpus.def gcc/config/mips/genopt.sh
gcc/config/rs6000/rs6000-tables.opt: gcc/config/rs6000/rs6000-cpus.def gcc/config/rs6000/genopt.sh
gcc/config/tilegx/mul-tables.c: gcc/config/tilepro/gen-mul-tables.cc
gcc/config/tilepro/mul-tables.c: gcc/config/tilepro/gen-mul-tables.cc
# And then, language-specific files
gcc/cp/cfns.h: gcc/cp/cfns.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
libquadmath/configure: libquadmath/configure.ac libquadmath/aclocal.m4
libquadmath/aclocal.m4: libquadmath/configure.ac libquadmath/acinclude.m4
libquadmath/Makefile.in: libquadmath/Makefile.am libquadmath/configure.ac libgfortran/aclocal.m4
libgfortran/configure: libgfortran/configure.ac libgfortran/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.am: libgomp/plugin/Makefrag.am
libgomp/Makefile.in: libgomp/Makefile.am libgomp/aclocal.m4
libgomp/testsuite/Makefile.in: libgomp/testsuite/Makefile.am libgomp/aclocal.m4
libgomp/configure.ac: libgomp/plugin/configfrag.ac
libgomp/configure: libgomp/configure.ac libgomp/aclocal.m4
libgomp/config.h.in: libgomp/configure.ac libgomp/aclocal.m4
libhsail-rt/aclocal.m4: libhsail-rt/configure.ac
libhsail-rt/Makefile.in: libhsail-rt/Makefile.am libhsail-rt/aclocal.m4
libhsail-rt/configure: libhsail-rt/configure.ac libhsail-rt/aclocal.m4
libhsail-rt/target-config.h.in: libhsail-rt/configure.ac libhsail-rt/aclocal.m4
libitm/aclocal.m4: libitm/configure.ac libitm/acinclude.m4
libitm/Makefile.in: libitm/Makefile.am libitm/aclocal.m4
libitm/testsuite/Makefile.in: libitm/testsuite/Makefile.am libitm/aclocal.m4
libitm/configure: libitm/configure.ac libitm/aclocal.m4
libitm/config.h.in: libitm/configure.ac libitm/aclocal.m4
libatomic/aclocal.m4: libatomic/configure.ac libatomic/acinclude.m4
libatomic/Makefile.in: libatomic/Makefile.am libatomic/aclocal.m4
libatomic/testsuite/Makefile.in: libatomic/testsuite/Makefile.am libatomic/aclocal.m4
libatomic/configure: libatomic/configure.ac libatomic/aclocal.m4
libatomic/auto-config.h.in: libatomic/configure.ac libatomic/aclocal.m4
libsanitizer/aclocal.m4: libsanitizer/configure.ac libsanitizer/acinclude.m4
libsanitizer/Makefile.in: libsanitizer/Makefile.am libsanitizer/aclocal.m4
libsanitizer/configure: libsanitizer/configure.ac libsanitizer/aclocal.m4
libsanitizer/asan/Makefile.in: libsanitizer/asan/Makefile.am libsanitizer/aclocal.m4
libsanitizer/interception/Makefile.in: libsanitizer/interception/Makefile.am libsanitizer/aclocal.m4
libsanitizer/sanitizer_common/Makefile.in: libsanitizer/sanitizer_common/Makefile.am libsanitizer/aclocal.m4
libvtv/aclocal.m4: libvtv/configure.ac libvtv/acinclude.m4
libvtv/Makefile.in: libvtv/Makefile.am libvtv/aclocal.m4
libvtv/configure: libvtv/configure.ac libvtv/aclocal.m4
libcilkrts/aclocal.m4: libcilkrts/configure.ac
libcilkrts/Makefile.in: libcilkrts/Makefile.am
libcilkrts/configure: libcilkrts/configure.ac
liboffloadmic/aclocal.m4: liboffloadmic/configure.ac
liboffloadmic/Makefile.in: liboffloadmic/Makefile.am
liboffloadmic/configure: liboffloadmic/configure.ac
liboffloadmic/plugin/aclocal.m4: liboffloadmic/plugin/configure.ac
liboffloadmic/plugin/Makefile.in: liboffloadmic/plugin/Makefile.am
liboffloadmic/plugin/configure: liboffloadmic/plugin/configure.ac
libbacktrace/aclocal.m4: libbacktrace/configure.ac
libbacktrace/Makefile.in: libbacktrace/Makefile.am libbacktrace/aclocal.m4
libbacktrace/configure: libbacktrace/configure.ac libbacktrace/aclocal.m4
libbacktrace/config.h.in: libbacktrace/configure.ac libbacktrace/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 ${silent+-q} -r`$GCC_HG branch` ${1+"$@"}
        if [ $? -ne 0 ]; then
            (touch_files_reexec)
            echo "hg pull of full tree failed." >&2
            exit 1
        fi

        # Update tree.  Needs to be done separately from pull so
        # gcc_update -rREV works.
        $GCC_HG update ${silent+-q} ${1+"$@"}
        if [ $? -ne 0 ]; then
            (touch_files_reexec)
            echo "hg update of full tree failed." >&2
            exit 1
        fi

        # Extract SVN revision corresponding to parents, 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.
        parents=`$GCC_HG parents --template '{rev}'`
        convert_revision=`$GCC_HG log --debug -r$parents | \
            sed -ne "/^extra:.*convert_revision=svn:/ {
                s%^[^/]*/%%
                p
            }"`
        revision=`echo $convert_revision | sed -e 's/.*@//'`
        branch=`echo $convert_revision | sed -e 's%branches/%%' -e 's/@.*//'`
        ;;

    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=`$GCC_SVN info | awk '/Revision:/ { print $2 }'`
        branch=`$GCC_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