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[Bug bootstrap/53728] New: [4.6 regression] Bootstrap comparison failure (gcc/varasm.o differs) with CFLAGS="-O2 -march=pentium3"
- From: "xarthisius.kk at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 20 Jun 2012 11:08:43 +0000
- Subject: [Bug bootstrap/53728] New: [4.6 regression] Bootstrap comparison failure (gcc/varasm.o differs) with CFLAGS="-O2 -march=pentium3"
- Auto-submitted: auto-generated
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53728
Bug #: 53728
Summary: [4.6 regression] Bootstrap comparison failure
(gcc/varasm.o differs) with CFLAGS="-O2
-march=pentium3"
Classification: Unclassified
Product: gcc
Version: 4.6.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: xarthisius.kk@gmail.com
Following steps are needed to reproduce:
./configure --host=i686-pc-linux-gnu --build=i686-pc-linux-gnu
--disable-altivec --disable-fixed-point --with-ppl --with-cloog
--disable-ppl-version-check --with-cloog-include=/usr/include/cloog-ppl
--enable-lto --enable-nls --without-included-gettext --with-system-zlib
--enable-obsolete --disable-werror --enable-secureplt --disable-multilib
--enable-libmudflap --disable-libssp --enable-libgomp --enable-checking=release
--disable-libgcj --with-arch=i686 --enable-languages=c,c++ --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--enable-targets=all
make -j24 'LDFLAGS=-Wl,-O1 -Wl,--as-needed' STAGE1_CFLAGS= 'BOOT_CFLAGS= -O2
-march=pentium3 -pipe' bootstrap-lean
Results in:
...
Comparing stages 2 and 3
warning: gcc/cc1plus-checksum.o differs
warning: gcc/cc1-checksum.o differs
Bootstrap comparison failure!
gcc/varasm.o differs
Regression was introduced with:
Turn on -fomit-frame-pointer by default for 32bit Linux/x86.
2010-08-12 H.J. Lu <hongjiu.lu@intel.com>
Uros Bizjak <ubizjak@gmail.com>
* config.gcc: Handle --enable-frame-pointer.
* configure.ac: Add --enable-frame-pointer.
* configure: Regenerated.
* config/i386/i386.c (USE_IX86_FRAME_POINTER): Default to 0.
(override_options): If not configured with --enable-frame-pointer,
enable -fomit-frame-pointer (but not for TARGET_MACHO or when
optimizing for size), -fasynchronous-unwind-tables and
-maccumulate-outgoing-args by default.
http://gcc.gnu.org/viewcvs?view=revision&revision=163196
and seems to be gone with:
http://gcc.gnu.org/viewcvs?view=revision&revision=171649