compare-debug: Drop LTO sections.

contrib/ChangeLog:
* compare-debug: Drop LTO sections.
config/ChangeLog:
* bootstrap-lto.mk: New.
gcc/ChangeLog:
* doc/install.texi: Document bootstrap-lto.

From-SVN: r161061
This commit is contained in:
Alexandre Oliva 2010-06-21 00:23:06 +00:00 committed by Alexandre Oliva
parent 6122686d13
commit 339325b303
6 changed files with 41 additions and 8 deletions

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@ -1,3 +1,7 @@
2010-06-20 Alexandre Oliva <aoliva@redhat.com>
* bootstrap-lto.mk: New.
2010-06-10 Paolo Bonzini <bonzini@gnu.org>
* override.m4: Remove obsolete (<2.64) definitions.

8
config/bootstrap-lto.mk Normal file
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@ -0,0 +1,8 @@
# This option enables LTO for stage2 and stage3. It requires lto to
# be enabled for stage1 with --enable-stage1-languages.
STAGE2_CFLAGS += -flto
STAGE3_CFLAGS += -flto
# Ada fails to build with LTO, turn it off for now.
BOOT_ADAFLAGS += -fno-lto

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@ -1,3 +1,7 @@
2010-06-20 Alexandre Oliva <aoliva@redhat.com>
* compare-debug: Drop LTO sections.
2010-06-15 Bernhard Reutner-Fischer <aldot@gcc.gnu.org>
* gcc_update: Support updating a git clone.

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@ -100,9 +100,11 @@ else
done
# If we found .eh_frame in one but not the other, or if we could not
# find a command to tell, try to strip off the .eh_frame section
# from both.
if test "x$cmp1" != "x$cmp2" || test "x$cmd" = "x"; then
# find a command to tell, or if there are LTO sections, try to strip
# off the .eh_frame and LTO sections from both.
if test "x$cmp1" != "x$cmp2" || test "x$cmd" = "x" ||
$cmd --section-headers "$1.$suf1" | grep '.gnu.lto_' > /dev/null ||
$cmd --section-headers "$2.$suf2" | grep '.gnu.lto_' > /dev/null ; then
suf3=$suf1.
while test -f "$1.$suf3"; do
suf3=$suf3.
@ -115,21 +117,27 @@ else
trap 'rm -f "$1.$suf1" "$2.$suf2" "$1.$suf3" "$2.$suf4"' 0 1 2 15
echo stripping off .eh_frame, then retrying >&2
echo stripping off .eh_frame and LTO sections, then retrying >&2
seclist=".eh_frame .rel.eh_frame .rela.eh_frame"
if test "x$cmd" != "x"; then
seclist="$seclist "`{ $cmd --section-headers "$1.$suf1"; $cmd --section-headers "$2.$suf2"; } | sed -n 's,.* \(\.gnu\.lto_[^ ]*\).*,\1,p' | sort -u`
fi
rsopts=`for sec in $seclist; do echo " --remove-section $sec"; done`
if (objcopy -v) 2>&1 | grep ' --remove-section' > /dev/null; then
objcopy --remove-section .eh_frame --remove-section .rel.eh_frame --remove-section .rela.eh_frame "$1.$suf1" "$1.$suf3"
objcopy $rsopts "$1.$suf1" "$1.$suf3"
mv "$1.$suf3" "$1.$suf1"
objcopy --remove-section .eh_frame --remove-section .rel.eh_frame --remove-section .rela.eh_frame "$2.$suf2" "$2.$suf4"
objcopy $rsopts "$2.$suf2" "$2.$suf4"
mv "$2.$suf4" "$2.$suf2"
elif (strip --help) 2>&1 | grep ' --remove-section' > /dev/null; then
cp "$1.$suf1" "$1.$suf3"
strip --remove-section .eh_frame --remove-section .rel.eh_frame --remove-section .rela.eh_frame "$1.$suf3"
strip $rsopts "$1.$suf3"
mv "$1.$suf3" "$1.$suf1"
cp "$2.$suf2" "$2.$suf4"
strip --remove-section .eh_frame --remove-section .rel.eh_frame --remove-section .rela.eh_frame "$2.$suf4"
strip $rsopts "$2.$suf4"
mv "$2.$suf4" "$2.$suf2"
else
echo failed to strip off .eh_frame >&2

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@ -1,3 +1,7 @@
2010-06-20 Alexandre Oliva <aoliva@redhat.com>
* doc/install.texi: Document bootstrap-lto.
2010-06-20 Alexandre Oliva <aoliva@redhat.com>
PR debug/44248

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@ -2150,6 +2150,11 @@ Removes any @option{-O}-started option from @code{BOOT_CFLAGS}, and adds
@item @samp{bootstrap-O3}
Analogous to @code{bootstrap-O1}.
@item @samp{bootstrap-lto}
Enables Link-Time Optimization for host tools during bootstrapping.
@samp{BUILD_CONFIG=bootstrap-lto} is equivalent to adding
@option{-flto} to @samp{BOOT_CFLAGS}.
@item @samp{bootstrap-debug}
Verifies that the compiler generates the same executable code, whether
or not it is asked to emit debug information. To this end, this