[Bug bootstrap/51648] [4.7 Regression] Profiledbootstrap failure on x86_64-linux

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51648

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.7.0
            Summary|[4.7 Regression]            |[4.7 Regression]
                   |                            |Profiledbootstrap failure
                   |                            |on x86_64-linux

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-12-21 10:32:29 UTC ---
CFLAGS='-O2 -g -fexceptions -fstack-protector --param=ssp-buffer-size=4
-mtune=generic' CXXFLAGS='-O2 -g -fexceptions -fstack-protector
--param=ssp-buffer-size=4 -mtune=generic' \
../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap
--enable-checking=release \
--disable-build-with-cxx --disable-build-poststage1-with-cxx --with-system-zlib
--enable-__cxa_atexit --enable-gnu-unique-object --enable-linker-build-id
--with-linker-hash-style=gnu \
--enable-languages=c,c++,lto --enable-plugin --with-ppl --with-cloog
--with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
make -j8 'BOOT_CFLAGS=-O2 -g -Wall -fexceptions -fstack-protector
--param=ssp-buffer-size=4 -mtune=generic' profiledbootstrap
fails on current trunk, reproduceably (3 times already) with:
../../gcc/gcc.c:8278:1: error: corrupted profile info: profile data is not
flow-consistent
../../gcc/gcc.c:8278:1: error: corrupted profile info: number of executions for
edge 262-263 thought to be -24
../../gcc/gcc.c:8278:1: error: corrupted profile info: number of executions for
edge 262-1 thought to be 24

I had to workaround two (bogus) uninitialized warnings first, will post a patch
for that.