[llvm-bugs] [Bug 45403] New: __builtin_longjmp/__builtin_setjmp don't work with -O

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45403

            Bug ID: 45403
           Summary: __builtin_longjmp/__builtin_setjmp don't work with -O
           Product: new-bugs
           Version: 9.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: hjl.tools at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    xiang1.zhang at intel.com

---
void *buf[5];

extern void abort (void);

void raise0(void)
{
  __builtin_longjmp (buf, 1);
}

int execute(int cmd)
{
  int last = 0;

  if (__builtin_setjmp (buf) == 0)
    while (1)
      {
        last = 1;
        raise0 ();
      }

  if (last == 0)
    return 0;
  else
    return cmd;
}

int main(void)
{
  if (execute (1) == 0)
    abort ();

  return 0;
}
---

[hjl at gnu-tgl-1 i386]$ clang -o /tmp/x cet-sjlj-1.c -O2 
[hjl at gnu-tgl-1 i386]$ /tmp/x
Aborted (core dumped)
[hjl at gnu-tgl-1 i386]$ gcc -o /tmp/x cet-sjlj-1.c -O2
[hjl at gnu-tgl-1 i386]$ /tmp/x
[hjl at gnu-tgl-1 i386]$

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