https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81866
Bug ID: 81866
Summary: ICE with a default template parameter which is a
template class nested in a template class
Product: gcc
Version: 7.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: lee.deokjae at gmail dot com
Target Milestone: ---
The following code causes an ICE with GCC 7.1.1. Clang 4.0 and VC++ 2017
compile the code successfully.
If I remove the forward declaration of struct C, it removes the error. Or
replacing the default template parameter with any template class defined
outside A also removes the error.
--------------------------------------------------------------------
template<class>
struct A {
template<class> struct C;
template<class> struct B;
template<class T = B<int>>
struct C {};
};
int main(int, char**) {
A<int>::C<> ac;
return 0;
}
--------------------------------------------------------------------
Test.cpp: In instantiation of ‘struct A<int>’:
Test.cpp:14:15: required from here
Test.cpp:6:31: internal compiler error: in finish_member_declaration, at
cp/semantics.c:2976
template<class> struct B;
