https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91890
--- Comment #4 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
I'm 100% convinced this has nothing to do with locations and all to do with how
-Warray-bounds and -Wstringop-overflow= interact.
Change the ignored for error,
char one[50];
char two[50];
void
test_strncat (void)
{
(void) __builtin_strcpy (one, "gh");
(void) __builtin_strcpy (two, "ef");
#pragma GCC diagnostic ignored "-Wstringop-overflow"
#pragma GCC diagnostic error "-Warray-bounds"
(void) __builtin_strncat (one, two, 99);
}
and run with -Wall -O2 -Wno-array-bounds and we get:
<source>:10:28: error: 'char* __builtin_strncat(char*, const char*, long
unsigned int)' forming offset [50, 98] is out of the bounds [0, 50] of object
'one' with type 'char [50]' [-Werror=array-bounds]
so the #pragma has an effect, but there is something weird with ignored and
-Wstringop-overflow interaction.
