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From: "pj at hugeone dot co.uk" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/99317] New: Missed warning
Date: Mon, 01 Mar 2021 14:25:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99317

            Bug ID: 99317
           Summary: Missed warning
           Product: gcc
           Version: 10.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pj at hugeone dot co.uk
  Target Milestone: ---

The code:

int *foo(void *v, void *w, int x) {
    float * f =3D v;
    int * i =3D w;
    return (x ? f : i);=20
}


int *foo1(void *v, void *w, int x) {
    float * f =3D v;
    int * i =3D w;
    return (1 ? f : (void *)i);=20
}

int *bar(void *v, void *w, int x) {
    float * f =3D v;
    int * i =3D w;
    return (x ? f : (void *)i);=20
}

Function foo correctly emits the warning:

source>: In function 'foo':
<source>:7:19: warning: pointer type mismatch in conditional expression
    7 |     return (x ? f : i);
      |                   ^

Casting removes that warming even in the trivial foo1 example.

https://godbolt.org/z/ozsPPY=