[Bug c/21107] New: internal compiler error: in expand_one_stack_var_at, at cfgexpand.c:476

["e9925248 at stud4 dot tuwien dot ac dot at" <gcc-bugzilla at gcc dot gnu dot org>]

If Pmode is smaller than the HOST_BITS_PER_WIDE_INT (ie for i686 as host all
targets, which use HImode or QImode as Pmode), a stack overflow produce the
following internal compiler error:

$./cc1 t4.c
 check1972

/homes/mkoegler/m68hc05/src/host-i686-pc-linux-gnu/gcc/test/t4.c: In function
'check1972':
/homes/mkoegler/m68hc05/src/host-i686-pc-linux-gnu/gcc/test/t4.c:7: internal
compiler error: in expand_one_stack_var_at, at cfgexpand.c:476
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
$cat t4.c
union S1972
{
  char b[24000];
};
void
check1972 ()
{
  union S1972 ret;
  union S1972 b1;
  union S1972 b2;
}

$./cc1 --version
GNU C version 4.1.0 20050416 (experimental) (avr)
        compiled by GNU C version 4.1.0 20050302 (experimental).
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096

-- 
           Summary: internal compiler error: in expand_one_stack_var_at, at
                    cfgexpand.c:476
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: e9925248 at stud4 dot tuwien dot ac dot at
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: avr-unknown-none


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21107