[Bug c/106853] New: compound literal storage duration

[marcelgcc at firemail dot eu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106853

            Bug ID: 106853
           Summary: compound literal storage duration
           Product: gcc
           Version: 11.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marcelgcc at firemail dot eu
  Target Milestone: ---

According to the C Standard a compound literal has automatic storage duration.
Please, consider the following code. Note it's C code NOT C++:

% cat test.c
#include <stdio.h>

struct ab {
  int a, b;
} *p1, *p2;

int set_p1(struct ab *ab) {
  p1 = ab;
  return 0;
}
int set_p2(struct ab *ab) {
  p2 = ab;
  return 0;
}

int main() {

  if (0 != set_p1(&(struct ab){42, 42})) {
    return 1;
  }
  set_p2(&(struct ab){46, 46});

  printf("%d, %d\n", p1->a, p1->b);
  printf("%d, %d\n", p2->a, p2->b);
  return 0;
}
/*EOF*/


# Expected Output:
% clang-15 -O1 test.c && ./a.out
42, 42                                        
46, 46

#####GCC#####

% gcc-11 -O1 test.c && ./a.out 
0, 0
46, 46

% gcc-11 test.c && ./a.out
42, 42
46, 46

% gcc-12 test.c && ./a.out 
46, 46
46, 46

% gcc-12 -O1 test.c && ./a.out
-760366272, 32718
46, 46

% gcc-11 --version
gcc (Debian 11.3.0-5) 11.3.0

% gcc-12 --version         
gcc (GCC) 12.2.0