https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120026
Bug ID: 120026
Summary: ICE (Segmentation fault) with -O3 when using ternary
operator to assign strdup to function pointer
Product: gcc
Version: 13.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: mario.rodriguezb1 at um dot es
Target Milestone: ---
The following C code triggers a segmentation fault and an internal compiler
error (ICE) in GCC when compiled with -O3. The issue occurs due to assigning a
function with mismatched signature (strdup) to a void (*)(char *, char *, int)
function pointer via a ternary operator.
```
#include <stdlib.h>
#include <string.h>
int main() {
char *mem1, *mem2;
mem1 = (char *) malloc(3 * sizeof(char));
mem2 = (char *) malloc(3 * sizeof(char));
void (*op1)(char *, char *, int);
int i = 2;
op1 = (i > 0)? strdup : strcpy;
if (mem1!= NULL && mem2!= NULL) {
op1(mem1, mem2, sizeof(char));
}
for (int i = 0; i < 2; i++)
rand();
}
```
To reproduce quickly:
it has been seen that it occurrs from version 12.1 to 13.3 only.
https://gcc.godbolt.org/z/Pf453nsh6
