http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56518
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|WORKSFORME |FIXED
Known to fail| |4.6.4
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> 2013-03-04
12:52:43 UTC ---
The ICE is
#0 0x00000000007bafa2 in c_common_signed_or_unsigned_type (unsignedp=1,
type=0x0)
at /space/rguenther/src/svn/gcc-4_6-branch/gcc/c-family/c-common.c:3018
#1 0x00000000007bfe47 in shorten_compare (op0_ptr=0x7fffffffcb80,
op1_ptr=0x7fffffffcb78, restype_ptr=0x7fffffffcb70,
rescode_ptr=0x7fffffffcb6c)
at /space/rguenther/src/svn/gcc-4_6-branch/gcc/c-family/c-common.c:3567
3562 else if (unsignedp0 == unsignedp1 && real1 == real2
3563 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION
(*restype_ptr)
3564 && TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION
(*restype_ptr))
3565 {
3566 type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1));
3567 type = c_common_signed_or_unsigned_type (unsignedp0
3568 || TYPE_UNSIGNED
(*restype_ptr),
3569 type);
which ends up calling cp_common_type which has (still also on trunk):
static tree
cp_common_type (tree t1, tree t2)
{
...
if (SCOPED_ENUM_P (t1) || SCOPED_ENUM_P (t2))
{
if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2))
return build_type_attribute_variant (t1, attributes);
else
return NULL_TREE;
}
but common_type () is not expected to return NULL_TREE.
ISTR this bug, it got fixed for 4.7+.
