c++: wrong ambiguity in accessing static field [PR112744]
Given
struct A { constexpr static int a = 0; };
struct B : A {};
struct C : A {};
struct D : B, C {};
we give the "'A' is an ambiguous base of 'D'" error for
D{}.A::a;
which seems wrong: 'a' is a static data member so there is only one copy
so it can be unambiguously referred to even if there are multiple A
objects. clang++/MSVC/icx agree.
This patch uses ba_any: [class.access.base] requires conversion to a unique
base subobject for non-static data members, but it does not require that the
base be unique or accessible for static data members.
PR c++/112744
gcc/cp/ChangeLog:
* typeck.cc (finish_class_member_access_expr): When accessing
a static data member, use ba_any for lookup_base.
gcc/testsuite/ChangeLog:
* g++.dg/lookup/scoped11.C: New test.
* g++.dg/lookup/scoped12.C: New test.
* g++.dg/lookup/scoped13.C: New test.
* g++.dg/lookup/scoped14.C: New test.
* g++.dg/lookup/scoped15.C: New test.