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c++: Allow IS_FAKE_BASE_TYPE for union types [PR114954]

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In some circumstances, unions can also have an __as_base type; we need
to make sure that IS_FAKE_BASE_TYPE correctly recognises this.

	PR c++/114954

gcc/cp/ChangeLog:

	* cp-tree.h (IS_FAKE_BASE_TYPE): Also apply to unions.

gcc/testsuite/ChangeLog:

	* g++.dg/modules/pr114954.C: New test.

Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com>
Reviewed-by: Jason Merrill <jason@redhat.com>
This commit is contained in:
Nathaniel Shead 2024-05-06 13:05:52 +10:00
parent ec2365e075
commit 0c43c673b0
2 changed files with 15 additions and 1 deletions
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2
gcc/cp/cp-tree.h
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@ -2616,7 +2616,7 @@ struct GTY(()) lang_type {
/* True iff NODE is the CLASSTYPE_AS_BASE version of some type. */
#define IS_FAKE_BASE_TYPE(NODE) \
(TREE_CODE (NODE) == RECORD_TYPE \
(RECORD_OR_UNION_TYPE_P (NODE) \
&& TYPE_CONTEXT (NODE) && CLASS_TYPE_P (TYPE_CONTEXT (NODE)) \
&& CLASSTYPE_AS_BASE (TYPE_CONTEXT (NODE)) == (NODE))

14
gcc/testsuite/g++.dg/modules/pr114954.C Normal file
View File

@ -0,0 +1,14 @@
// PR c++/114954
// { dg-additional-options "-fmodules-ts" }
// { dg-module-cmi main }
export module main;
template <int N>
union U {
private:
char a[N + 1];
int b;
};
U<4> p;