diff options
Diffstat (limited to 'gcc/c/c-typeck.c')
| -rw-r--r-- | gcc/c/c-typeck.c | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/gcc/c/c-typeck.c b/gcc/c/c-typeck.c index 0ff28f2..cee566f 100644 --- a/gcc/c/c-typeck.c +++ b/gcc/c/c-typeck.c @@ -1105,10 +1105,28 @@ comptypes_internal (const_tree type1, const_tree type2, bool *enum_and_int_p, switch (TREE_CODE (t1)) { + case INTEGER_TYPE: + case FIXED_POINT_TYPE: + case REAL_TYPE: + /* With these nodes, we can't determine type equivalence by + looking at what is stored in the nodes themselves, because + two nodes might have different TYPE_MAIN_VARIANTs but still + represent the same type. For example, wchar_t and int could + have the same properties (TYPE_PRECISION, TYPE_MIN_VALUE, + TYPE_MAX_VALUE, etc.), but have different TYPE_MAIN_VARIANTs + and are distinct types. On the other hand, int and the + following typedef + + typedef int INT __attribute((may_alias)); + + have identical properties, different TYPE_MAIN_VARIANTs, but + represent the same type. The canonical type system keeps + track of equivalence in this case, so we fall back on it. */ + return TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2); + case POINTER_TYPE: - /* Do not remove mode or aliasing information. */ - if (TYPE_MODE (t1) != TYPE_MODE (t2) - || TYPE_REF_CAN_ALIAS_ALL (t1) != TYPE_REF_CAN_ALIAS_ALL (t2)) + /* Do not remove mode information. */ + if (TYPE_MODE (t1) != TYPE_MODE (t2)) break; val = (TREE_TYPE (t1) == TREE_TYPE (t2) ? 1 : comptypes_internal (TREE_TYPE (t1), TREE_TYPE (t2), |