http://llvm.org/bugs/show_bug.cgi?id=19288
Bug ID: 19288
Summary: thread_local member variable accessed without being
constructed
Product: clang
Version: trunk
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
This bug exists in both clang++ and g++ and was first reported in
stackoverflow:
http://stackoverflow.com/questions/22722941/thread-local-member-variable-construction
A simple test case is here
http://coliru.stacked-crooked.com/a/959f4c60a9f90116
#include <iostream>
using namespace std;
struct foo {
int i;
foo(): i{42} {}
};
struct bar {
static thread_local foo FOO;
};
thread_local foo bar::FOO;
int main() {
//cerr << string((bar::FOO.i == 42) ? "Ok" : "Bug") << endl; //Ok
cerr << string((bar().FOO.i == 42) ? "Ok" : "Bug") << endl; //Bug
return 0;
}
Invoked as
clang++ -std=c++11 -O2 -Wall -pedantic -pthread main.cpp && ./a.out
Output is
Bug
Expected output is
Ok
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