[Bug middle-end/55496] New: False positive -Werror=uninitialized

["hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55496

             Bug #: 55496
           Summary: False positive -Werror=uninitialized
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hjl.tools@gmail.com


On Linux/x86-64, revision 193864 configured with

--prefix=/usr/4.8.0 --enable-clocale=gnu --with-system-zlib --enable-shared
--with-demangler-in-ld --with-build-config=bootstrap-lto --with-fpmath=sse
--enable-languages=c,c++,fortran,java,lto,objc

and built with

make bld profiledbootstrap -j 8

on a 8-core machine gave

/export/gnu/import/git/gcc-test-profile/bld/./prev-gcc/g++
-B/export/gnu/import/git/gcc-test-profile/bld/./prev-gcc/
-B/usr/4.8.0/x86_64-unknown-linux-gnu/bin/ -nostdinc++
-B/export/gnu/import/git/gcc-test-profile/bld/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-B/export/gnu/import/git/gcc-test-profile/bld/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs
-I/export/gnu/import/git/gcc-test-profile/bld/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include/x86_64-unknown-linux-gnu
-I/export/gnu/import/git/gcc-test-profile/bld/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include
-I/export/gnu/import/git/gcc-test-profile/src-trunk/libstdc++-v3/libsupc++
-L/export/gnu/import/git/gcc-test-profile/bld/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-L/export/gnu/import/git/gcc-test-profile/bld/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs
-c   -g -O2 -flto=jobserver -frandom-seed=1 -fprofile-use -DIN_GCC  
-fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing
-Wwrite-strings -Wcast-qual -Wmissing-format-attribute -pedantic -Wno-long-long
-Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common 
-DHAVE_CONFIG_H -I. -I. -I../../src-trunk/gcc -I../../src-trunk/gcc/.
-I../../src-trunk/gcc/../include -I../../src-trunk/gcc/../libcpp/include 
-I../../src-trunk/gcc/../libdecnumber -I../../src-trunk/gcc/../libdecnumber/bid
-I../libdecnumber -I../../src-trunk/gcc/../libbacktrace   
../../src-trunk/gcc/cfg.c -o cfg.o
../../src-trunk/gcc/cfg.c: In function
'scale_bbs_frequencies_gcov_type(basic_block_def**, int, long, long)':
../../src-trunk/gcc/cfg.c:945:8: error: 'e' may be used uninitialized in this
function [-Werror=uninitialized]
   edge e;
cc1plus: all warnings being treated as errors
make[6]: *** [cfg.o] Error 1
make[6]: *** Waiting for unfinished jobs....
rm gcj-dbtool.pod jcf-dump.pod jv-convert.pod grmic.pod gcov.pod gcj.pod
gc-analyze.pod gfdl.pod cpp.pod gij.pod gfortran.pod gcc.pod fsf-funding.pod
make[6]: Leaving directory `/export/gnu/import/git/gcc-test-profile/bld/gcc'
make[5]: *** [all-stagefeedback-gcc] Error 2
make[5]: Leaving directory `/export/gnu/import/git/gcc-test-profile/bld'
make[4]: *** [stagefeedback-bubble] Error 2
make[4]: Leaving directory `/export/gnu/import/git/gcc-test-profile/bld'
make[3]: *** [profiledbootstrap] Error 2
make[3]: Leaving directory `/export/gnu/import/git/gcc-test-profile/bld'
11063.14user 498.20system 41:50.07elapsed 460%CPU (0avgtext+0avgdata
521396maxresident)k
55104inputs+14523280outputs (2major+111666564minor)pagefaults 0swaps
make[2]: *** [profiledbootstrap] Error 2