[Bug c/121661] New: miscompilation involving complex and nested functions

[uecker at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121661

            Bug ID: 121661
           Summary: miscompilation involving complex and nested functions
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: uecker at gcc dot gnu.org
  Target Milestone: ---

The following example is miscompiled to output zero instead of 1. Strangle in
seems to depend on the presence of a nested function and the address-of.

https://godbolt.org/z/M979PM88a

#include <assert.h>
#include <stdio.h>
#include <complex.h>

static void fun1(complex double val)
{
#if 1
  void nfun()
  {
    printf("%f\n", creal(val));
  }
  (void)nfun;
  (void)&val;
  printf("%f\n", creal(val));
}

int main(int argc, char* [])
{
  fun1(1.);
}