https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77935
Bug ID: 77935
Summary: uninstantiated template constructor
Product: gcc
Version: 6.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: stefaan.deroeck at gmail dot com
Target Milestone: ---
The following code results in:
/tmp/ccOkdgv6.o: In function `main':
u.cpp:(.text+0x26): undefined reference to `A<void ()>::A()'
collect2: error: ld returned 1 exit status
-- code --
template <class U>
struct A
{
A() {}
};
struct B
{
A<void()> a;
};
void func(B b = {}) {}
int main()
{
func();
}
-- end code --
observed on:
g++ (Ubuntu 5.4.0-6ubuntu1~16.04.2) 5.4.0 20160609
g++ (GCC) 6.1.0
