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re PR bootstrap/85571 (non-bootstrap-debug miscompare with trunk)

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2018-05-08  Richard Biener  <rguenther@suse.de>

	PR bootstrap/85571
	config/
	* bootstrap-lto-noplugin.mk: Disable compare.
	* bootstrap-lto.mk: Supply contrib/compare-lto for do-compare.

	contrib/
	* compare-lto: New script derived from compare-debug.

From-SVN: r260026
This commit is contained in:
Richard Biener 2018-05-08 08:50:33 +00:00 committed by Richard Biener
parent ab7d466dc7
commit 4be63d9e5e
5 changed files with 125 additions and 0 deletions
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6
config/ChangeLog
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@ -1,3 +1,9 @@
2018-05-08 Richard Biener <rguenther@suse.de>
PR bootstrap/85571
* bootstrap-lto-noplugin.mk: Disable compare.
* bootstrap-lto.mk: Supply contrib/compare-lto for do-compare.
2018-04-24 H.J. Lu <hongjiu.lu@intel.com>
PR bootstrap/85490

1
config/bootstrap-lto-noplugin.mk
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@ -6,3 +6,4 @@ STAGE3_CFLAGS += -flto=jobserver -frandom-seed=1 -ffat-lto-objects
STAGEprofile_CFLAGS += -flto=jobserver -frandom-seed=1
STAGEtrain_CFLAGS += -flto=jobserver -frandom-seed=1
STAGEfeedback_CFLAGS += -flto=jobserver -frandom-seed=1
do-compare = /bin/true

2
config/bootstrap-lto.mk
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@ -13,3 +13,5 @@ LTO_RANLIB = $$r/$(HOST_SUBDIR)/prev-gcc/gcc-ranlib$(exeext) -B$$r/$(HOST_SUBDIR
LTO_EXPORTS = AR="$(LTO_AR)"; export AR; \
RANLIB="$(LTO_RANLIB)"; export RANLIB;
LTO_FLAGS_TO_PASS = AR="$(LTO_AR)" RANLIB="$(LTO_RANLIB)"
do-compare = $(SHELL) $(srcdir)/contrib/compare-lto $$f1 $$f2

5
contrib/ChangeLog
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@ -1,3 +1,8 @@
2018-05-08 Richard Biener <rguenther@suse.de>
PR bootstrap/85571
* compare-lto: New script derived from compare-debug.
2018-05-02 Jakub Jelinek <jakub@redhat.com>
* gennews (files): Add files for GCC 8.

111
contrib/compare-lto Executable file
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@ -0,0 +1,111 @@
#! /bin/sh
# Compare copies of two given object files.
# Copyright (C) 2007, 2008, 2009, 2010, 2012 Free Software Foundation
# Originally by Alexandre Oliva <aoliva@redhat.com>
# Modified for LTO bootstrap by Richard Biener <rguenther@suse.de>
# This file is part of GCC.
# GCC is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation; either version 3, or (at your option) any later
# version.
# GCC is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
# License for more details.
# You should have received a copy of the GNU General Public License
# along with GCC; see the file COPYING3. If not see
# <http://www.gnu.org/licenses/>.
rm='rm -f'
case $1 in
-p | --preserve)
rm='echo preserving'
shift
;;
esac
if test $# != 2; then
echo 'usage: compare-lto file1.o file2.o' >&2
exit 1
fi
if test ! -f "$1"; then
echo "$1" does not exist >&2
exit 1
fi
if test ! -f "$2"; then
echo "$2" does not exist >&2
exit 1
fi
suf1=stripped
while test -f "$1.$suf1"; do
suf1=$suf1.
done
suf2=stripped
while test -f "$2.$suf2"; do
suf2=$suf2.
done
trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15
if cmp "$1" "$2"; then
status=0
else
status=1
cmd=
for t in objdump readelf eu-readelf; do
if ($t --help) 2>&1 | grep ' --\[*section-\]*headers' > /dev/null; then
cmd=$t
break
fi
done
# If there are LTO option sections, try to strip them off.
if test "x$cmd" = "x" ||
$cmd --section-headers "$1" | grep '.gnu.lto_.opts' > /dev/null ||
$cmd --section-headers "$2" | grep '.gnu.lto_.opts' > /dev/null ; then
echo stripping off LTO option section, then retrying >&2
seclist=".gnu.lto_.opts"
rsopts=`for sec in $seclist; do echo " --remove-section $sec"; done`
if (objcopy -v) 2>&1 | grep ' --remove-section' > /dev/null; then
objcopy $rsopts "$1" "$1.$suf1"
objcopy $rsopts "$2" "$2.$suf2"
elif (strip --help) 2>&1 | grep ' --remove-section' > /dev/null; then
cp "$1" "$1.$suf1"
strip $rsopts "$1.$suf1"
cp "$2" "$2.$suf2"
strip $rsopts "$2.$suf2"
else
echo failed to strip off LTO option section >&2
fi
trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15
if cmp "$1.$suf1" "$2.$suf2"; then
status=0
else
status=1
fi
fi
fi
$rm "$1.$suf1" "$2.$suf2"
trap "exit $status; exit" 0 1 2 15
exit $status