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[Bug tree-optimization/25737] [4.1/4.2 Regression] ACATS tests c974001 and c974013 do not terminate with struct aliasing
- From: "ebotcazou at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 23 Mar 2006 18:08:11 -0000
- Subject: [Bug tree-optimization/25737] [4.1/4.2 Regression] ACATS tests c974001 and c974013 do not terminate with struct aliasing
- References: <bug-25737-10053@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #13 from ebotcazou at gcc dot gnu dot org 2006-03-23 18:08 -------
> That is indeed sufficient to fix the bug for the C testcase but not for an
> equivalent Ada testcase, so Richard might have been right in thinking that
> there is also some type frobbing on the Ada side :-(
Not a bug, but a feature. :-) Everything is not addressable in Ada, unlike in
C.
The tree aliasing machinery appears to totally overlook the flag
/* Used in a FIELD_DECL to indicate that we cannot form the address of
this component. */
#define DECL_NONADDRESSABLE_P(NODE) \
(FIELD_DECL_CHECK (NODE)->decl_common.decl_flag_3)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25737