https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78768
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=71907
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Bug 71907 points out a similar problem with buffer overflow warnings issued by
_FORTIFY_SOURCE. That bug has been fixed and a test case for the
-Wstringop-overflow option works as expected:
$ (set -x && cat a.c && for o in -fno-lto -flto; do /build/gcc-svn/gcc/xgcc -B
/build/gcc-svn/gcc -O2 $o a.c; done)
+ cat a.c
char d[1];
int main (int argc, char *argv[])
{
char *s = argc < 3 ? "12" : "123";
__builtin_strcpy (d, s);
}
+ for o in -fno-lto -flto
+ /build/gcc-svn/gcc/xgcc -B /build/gcc-svn/gcc -O2 -fno-lto a.c
a.c: In function ‘main’:
a.c:7:3: warning: ‘__builtin_strcpy’ writing 3 bytes into a region of size 1
overflows the destination [-Wstringop-overflow=]
__builtin_strcpy (d, s);
^~~~~~~~~~~~~~~~~~~~~~~
+ for o in -fno-lto -flto
+ /build/gcc-svn/gcc/xgcc -B /build/gcc-svn/gcc -O2 -flto a.c
a.c: In function ‘main’:
a.c:7:3: warning: ‘__builtin_strcpy’ writing 3 bytes into a region of size 1
overflows the destination [-Wstringop-overflow=]
__builtin_strcpy (d, s);
^
