https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123475
Bug ID: 123475
Summary: wrong warning about variable used uninitialized
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: rootkit85 at yahoo dot it
Target Milestone: ---
This code snippet:
```
void cap_last_cap(void) {
_Atomic int saved = 1000;
int c;
c = saved;
}
```
Gives the following warning:
undef.c: In function ‘cap_last_cap’:
undef.c:5:11: warning: ‘D.4590’ is used uninitialized [-Wuninitialized]
5 | c = saved;
| ~~^~~~~~~
undef.c:5:9: note: ‘D.4590’ was declared here
5 | c = saved;
| ^
To reproduce it I use this command line:
gcc -Wall -ftrivial-auto-var-init=zero -O2 -o /dev/null -c undef.c
Some system information:
$ cat /etc/fedora-release
Fedora release 44 (Rawhide)
$ rpm -q gcc
gcc-16.0.0-0.4.fc44.aarch64
