https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104550
--- Comment #18 from qinzhao at gcc dot gnu.org ---
One question here, for the following testing case:
[opc@qinzhao-ol7u9 104550]$ cat t1.c
struct vx_audio_level {
int has_monitor_level : 1;
};
void vx_set_monitor_level() {
struct vx_audio_level info;
__builtin_clear_padding (&info);
}
[opc@qinzhao-ol7u9 104550]$ sh t
/home/opc/Install/latest/bin/gcc -O -Wuninitialized -Wall t1.c -S
t1.c: In function ‘vx_set_monitor_level’:
t1.c:7:2: warning: ‘info’ is used uninitialized [-Wuninitialized]
7 | __builtin_clear_padding (&info);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
t1.c:6:24: note: ‘info’ declared here
6 | struct vx_audio_level info;
| ^~~~
We can see that the compiler emitted the exactly same warning as with
-ftrivial-auto-var-init=pattern.
my question is, is the "info" in __builtin_clear_padding(&info) a REAL use of
"info"? is it correct to report the uninitialized use message for it?
