[Bug c/121824] New: side effects of expressions not done

[tydeman at tybor dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121824

            Bug ID: 121824
           Summary: side effects of expressions not done
           Product: gcc
           Version: 15.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tydeman at tybor dot com
  Target Milestone: ---

This fails:

#include <assert.h>
#include <limits.h>
#include <errno.h>
#include <stdio.h>
#include <float.h>
#include <fenv.h>
#include <math.h>       /* glibc 2.41-11 */

#pragma STDC FENV_ACCESS ON
#pragma STDC FP_CONTRACT OFF
#pragma STDC FENV_ROUND FE_TONEAREST
#pragma STDC FENV_DEC_ROUND FE_DEC_TONEAREST
#pragma STDC CX_LIMITED_RANGE OFF

int main(void){

  if(1){
    int d7;
    int flags;
    d7 = ( 1, (0./0.), 0 );     /* should raise invalid */
    flags = fetestexcept( FE_ALL_EXCEPT );
    assert( 0 == d7 );
    assert( 0 != flags );       /* fails here */
  }
  return 0;
}