[Bug c/111056] New: Missing -Wsign-compare warning with enum values

[alexhenrie24 at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111056

            Bug ID: 111056
           Summary: Missing -Wsign-compare warning with enum values
           Product: gcc
           Version: 13.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: alexhenrie24 at gmail dot com
  Target Milestone: ---

#include <stdio.h>

int main()
{
    signed int a = 1;
    enum : signed int { b = 1 };
    unsigned int c = -1;

    if (a < c) // condition is true, -Wsign-compare warns about it
        puts("a < c");

    if (b < c) // condition is true, but no warning
        puts("b < c");

    return 0;
}

The compiler should warn about both if statements.

$ gcc --version
gcc (GCC) 13.2.1 20230801