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decl.c (duplicate_decls): Don't try to unify an implicit typedef with an explicit one.

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* decl.c (duplicate_decls): Don't try to unify an implicit typedef
	with an explicit one.
	(lookup_tag): Extract the tag of an explicit typedef.

From-SVN: r52159
This commit is contained in:
Richard Sandiford 2002-04-11 14:16:26 +00:00 committed by Richard Sandiford
parent df51a2457a
commit d75ff18417
2 changed files with 34 additions and 3 deletions
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6
gcc/cp/ChangeLog
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@ -1,3 +1,9 @@
2002-04-11 Richard Sandiford <rsandifo@redhat.com>
* decl.c (duplicate_decls): Don't try to unify an implicit typedef
with an explicit one.
(lookup_tag): Extract the tag of an explicit typedef.
2002-04-10 Nathan Sidwell <nathan@codesourcery.com>
PR c++/5507

29
gcc/cp/decl.c
View File

@ -3426,6 +3426,18 @@ duplicate_decls (newdecl, olddecl)
}
}
/* Do not merge an implicit typedef with an explicit one. In:
class A;
...
typedef class A A __attribute__ ((foo));
the attribute should apply only to the typedef. */
if (TREE_CODE (olddecl) == TYPE_DECL
&& (DECL_IMPLICIT_TYPEDEF_P (olddecl)
|| DECL_IMPLICIT_TYPEDEF_P (newdecl)))
return 0;
/* If new decl is `static' and an `extern' was seen previously,
warn about it. */
warn_extern_redeclared_static (newdecl, olddecl);
@ -5336,10 +5348,23 @@ lookup_tag (form, name, binding_level, thislevel_only)
else
old = BINDING_TYPE (old);
/* If it has an original type, it is a typedef, and we
should not return it. */
/* If the declaration has an original type, it must a
typedef. When it is an explicit typedef of the form:
typedef struct A A;
the original type will be the tag that we want.
We should not return any other kind of typedef.
Detect the valid case by checking that the original
type has the same name and context as the typedef. */
if (old && DECL_ORIGINAL_TYPE (TYPE_NAME (old)))
{
old = DECL_ORIGINAL_TYPE (TYPE_NAME (old));
if (TYPE_IDENTIFIER (old) != name
|| context_for_name_lookup (TYPE_NAME (old)) != tail)
old = NULL_TREE;
}
if (old && TREE_CODE (old) != form
&& (form == ENUMERAL_TYPE || TREE_CODE (old) == ENUMERAL_TYPE))
{