[Bug sanitizer/55519] New: [asan] False positive -Wmaybe-uninitialized

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55519

             Bug #: 55519
           Summary: [asan] False positive -Wmaybe-uninitialized
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hjl.tools@gmail.com
                CC: dodji@gcc.gnu.org, dvyukov@gcc.gnu.org,
                    jakub@gcc.gnu.org, kcc@gcc.gnu.org


When -fsanitize=address is used with -O2 -flto=jobserver -frandom-seed=1,
I got

/export/gnu/import/git/gcc/gcc/tree-ssa-loop-im.c: In function
âstore_motion_loop(loop*, bitmap_head_def*)â:
/export/gnu/import/git/gcc/gcc/tree-ssa-loop-im.c:2014:29: warning:
âstore_flagâ may be used uninitialized in this function [-Wmaybe-uninitialized]
        NULL_TREE, NULL_TREE);
                             ^
/export/gnu/import/git/gcc/gcc/tree-ssa-loop-im.c:2113:17: note: âstore_flagâ
was declared here
   tree tmp_var, store_flag;

/export/gnu/import/git/gcc/gcc/gcc.c: In function âdo_spec_1(char const*, int,
char const*)â:
/export/gnu/import/git/gcc/gcc/../include/obstack.h:337:52: warning:
âsave_growing_valueâ may be used uninitialized in this function
[-Wmaybe-uninitialized]
    _obstack_memcpy (__o->next_free, (where), __len);   \
                                                    ^
/export/gnu/import/git/gcc/gcc/gcc.c:5489:9: note: âsave_growing_valueâ was
declared here
   void *save_growing_value;