http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51544
Bug #: 51544
Summary: uninitialized variable false positive prevents
bootstrap at -O3
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: [email protected]
ReportedBy: [email protected]
I checked by hand, and this looks like a false positive to me. It doesn't come
up without
-O[3,fast].
NOTE: I have hand-modified my build/bootstrap-lto.mk to use -Ofast. It's
possible that using the bootstrap-O3 build-config will reproduce it as well.
$ ~/src/gcc-trunk/configure --enable-bootstrap --prefix=/home/matt
--enable-clocale=gnu --with-system-zlib --with-demangler-in-ld --enable-lto
--with-fpmath=sse --enable-languages=c,c++,lto
--with-build-config=bootstrap-lto --enable-build-with-cxx --disable-libmudflap
--with-cpu=core2 --with-tune=core2 --disable-libssp
$ make -j7 profiledbootstrap
/home/matt/src/gcc-trunk/gcc/cp/parser.c: In function ‘bool
cp_parser_ctor_initializer_opt_and_function_body(cp_parser*)’:
/home/matt/src/gcc-trunk/gcc/cp/parser.c:17533:43: error: ‘list’ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
