https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86384
Bug ID: 86384
Summary: Scoped enumeration instantiated even if not required
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: zhonghao at pku dot org.cn
Target Milestone: ---
The code is as follow:
template<typename T>
struct A {
enum class B {
X = T::value
};
};
int main() {
A<int> a;
}
g++ error:
code0.c.cpp:4:13: error: 'value' is not a member of 'int'
enum class B {
^
This code looks well-formed. Only if we look into the enumeration, as
"A<int>::B::X", the definition of the enumeration is required to exist and thus
implicitly instantiated. This is specified at 14.7.1p1 and p2. I tried clang++.
It accepts the code without any error message.
