[Bug target/34982] [4.3 regression] calling a function with undefined parameters causes segmentation fault at -O1 or higher

[rguenth at gcc dot gnu dot org]

------- Comment #1 from rguenth at gcc dot gnu dot org  2008-01-26 18:50 -------
We seem to use local calling conventions for emitting the body of something,
but
at the call site we pass arguments via the stack.

P1 until we know more about this.

Reduced testcase:

extern void abort (void);

static void something();

int main()
{
  something(-1);
}

static void something(int i)
{
  if (i != -1)
    abort ();
}

The asm shows it:

something:
        subl    $12, %esp
        cmpl    $-1, %eax
        je      .L3
        call    abort
.L3:
        addl    $12, %esp
        ret

but:

main:
        leal    4(%esp), %ecx
        andl    $-16, %esp
        pushl   -4(%ecx)
        pushl   %ecx
        subl    $8, %esp
        movl    $-1, (%esp)
        call    something


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
          Component|c                           |target
     Ever Confirmed|0                           |1
           Keywords|                            |wrong-code
           Priority|P3                          |P1
   Last reconfirmed|0000-00-00 00:00:00         |2008-01-26 18:50:39
               date|                            |
   Target Milestone|---                         |4.3.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34982