http://llvm.org/bugs/show_bug.cgi?id=22763
Bug ID: 22763
Summary: Explicit template instantiations do not instantiate
explicitly defaulted special members
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
$ cat foo.h
struct base {
virtual ~base() {};
};
template <typename T>
struct foo : base {
foo() {};
foo(const foo&)
#ifdef DEFAULT
= default;
#else
{}
#endif
};
__extension__ extern template struct foo<int>;
$ cat ext.cpp
#include "foo.h"
int main() {
foo<int> f;
foo<int> g = f;
}
$ cat ext2.cpp
#include "foo.h"
template struct foo<int>;
$ clang++-tot ext.cpp -std=c++11 ext2.cpp
$ clang++-tot ext.cpp -std=c++11 ext2.cpp -DDEFAULT
/tmp/ext-f809ea.o:ext.cpp:function main: error: undefined reference to
'foo<int>::foo(foo<int> const&)'
clang-3.5: error: linker command failed with exit code 1 (use -v to see
invocation)
$
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