[Bug bootstrap/53449] New: [4.8 regression] fortran fails to build

["vincenzo.innocente at cern dot ch" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53449

             Bug #: 53449
           Summary: [4.8 regression] fortran fails to build
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: vincenzo.innocente@cern.ch


with revision 187761
I now get an error while building fortran 

In file included from ../../gcc-trunk/gcc/fortran/trans-common.c:1310:0,
                 from ./gt-fortran-trans-io.h:88,
                 from :4794:
../../gcc-trunk/gcc/fortran/parse.c: In function 'gfc_parse_file':
../../gcc-trunk/gcc/fortran/parse.c:4603:60: error: 'errors_before' may be used
uninitialized in this function [-Werror=maybe-uninitialized]
       gfc_dump_module (s.sym->name, errors_before == errors);
                                                            ^
In file included from ../../gcc-trunk/gcc/fortran/trans-common.c:1310:0,
                 from ./gt-fortran-trans-io.h:88,
                 from :4794:
../../gcc-trunk/gcc/fortran/parse.c:4487:21: note: 'errors_before' was declared
here
   int seen_program, errors_before, errors;
                     ^
lto1: all warnings being treated as errors
make[4]: *** [/tmp/innocent/ccixchHw.ltrans30.ltrans.o] Error 1

configuration that fails
../gcc-trunk/configure --prefix=/afs/cern.ch/user/i/innocent/w2
--enable-languages=c,c++,fortran -enable-gold=yes --enable-lto
--with-build-config=bootstrap-lto --with-gmp-lib=/usr/local/lib64
--with-mpfr-lib=/usr/local/lib64 -with-mpc-lib=/usr/local/lib64
--enable-cloog-backend=isl --with-cloog=/usr/local
--with-ppl-lib=/usr/local/lib64 CFLAGS='-O2 -ftree-vectorize -fPIC'
CXXFLAGS='-O2 -fPIC -ftree-vectorize -fvisibility-inlines-hidden -march=native'
-enable-libitm -disable-multilib

configuration that succeeds
../gcc-trunk/configure --enable-languages=c,c++,fortran --disable-multilib
--enable-gold=yes --disable-nls --enable-lto
--with-mpc=/afs/cern.ch/cms/slc5_amd64_gcc470/external/gcc/4.7.0
--with-gmp=/afs/cern.ch/cms/slc5_amd64_gcc470/external/gcc/4.7.0
--with-mpfr=/afs/cern.ch/cms/slc5_amd64_gcc470/external/gcc/4.7.0
--prefix=/afs/cern.ch/user/i/innocent/w3/gcc47slc5