https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66944
Bug ID: 66944
Summary: static thread_local member in class template may cause
compilation to fail
Product: gcc
Version: 5.2.0
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: zhykzhykzhyk at gmail dot com
Target Milestone: ---
Affect Versions: 4.9.3, 5.1.0, 5.2.0
Expected behavior:
compiles correctly (like clang does)
Compiler output:
bug.cc:14:34: error: redefinition of 'bool __tls_guard'
thread_local std::vector<void *> A<T>::v;
^
bug.cc:14:34: note: 'bool __tls_guard' previously declared here
bug.cc:14: confused by earlier errors, bailing out
== code ==
struct Heavy { Heavy(){} };
template <typename T>
struct A {
virtual void foo() { v; }
static thread_local Heavy v;
};
template <typename T>
thread_local Heavy A<T>::v;
struct E {};
struct F {};
int main() {
A<E> foo;
A<F> bar;
bar.v;
}
==========
