[Bug middle-end/59185] [4.7 Regression] compile error for va_list as a pointer parameter

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59185

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Reduced testcase:

#include <stdarg.h>
void zlog (const char *format, ...)
{
  va_list args[5];
  int index;
  for (index = 0; index < 5; index++)
    va_start(args[index], format);
  for (index = 0; index < 5; index++)
    va_end(args[index]);
}

fails with -O1

#0  internal_error (gmsgid=0x1674417 "in %s, at %s:%d")
    at /space/rguenther/src/svn/gcc-4_7-branch/gcc/diagnostic.c:843
#1  0x000000000132f27e in fancy_abort (
    file=0x146a590 "/space/rguenther/src/svn/gcc-4_7-branch/gcc/tree.c", 
    line=3963, 
    function=0x146e570 <__FUNCTION__.48689> "build_simple_mem_ref_loc")
    at /space/rguenther/src/svn/gcc-4_7-branch/gcc/diagnostic.c:899
#2  0x0000000000e0bac5 in build_simple_mem_ref_loc (loc=0, ptr=0x0)
    at /space/rguenther/src/svn/gcc-4_7-branch/gcc/tree.c:3963
#3  0x0000000000e8f87f in ix86_va_start (valist=0x7ffff5be1668, 
    nextarg=0x7ffff5be2c80)
    at /space/rguenther/src/svn/gcc-4_7-branch/gcc/config/i386/i386.c:7798
#4  0x000000000060033e in expand_builtin_va_start (exp=0x7ffff5c03240)
    at /space/rguenther/src/svn/gcc-4_7-branch/gcc/builtins.c:4254
#5  0x000000000060c449 in expand_builtin (exp=0x7ffff5c03240, 
    target=0x7ffff5ac8470, subtarget=0x0, mode=VOIDmode, ignore=1)
    at /space/rguenther/src/svn/gcc-4_7-branch/gcc/builtins.c:6355

#3  0x0000000000e8f87f in ix86_va_start (valist=0x7ffff5be1668, 
    nextarg=0x7ffff5be2c80)
    at /space/rguenther/src/svn/gcc-4_7-branch/gcc/config/i386/i386.c:7798
7798      valist = build_simple_mem_ref (valist);
(gdb) call debug_generic_expr (valist)
&args[index_22]

It's TER and the way it works in 4.7, -fno-tree-ter fixes it.