[llvm-bugs] [Bug 35237] New: __thread in template does not compile

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35237

            Bug ID: 35237
           Summary: __thread in template does not compile
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: oranevskyy at accesssoftek.com
                CC: llvm-bugs at lists.llvm.org

test.cpp:
template<typename T>
void test()
{
  static __thread T my(555);
}

void foo()
{
  test<int>();
}

Compilation:
clang++ -c -std=c++11 test.cpp

Output:
test.cpp:4:23: error: initializer for thread-local
      variable must be a constant expression
  static __thread T my(555);
                      ^~~~~
test.cpp:4:21: note: use 'thread_local' to allow
      this
  static __thread T my(555);

Gcc compiles this with no error. 

As T is a dependent type clang does not "unfold" the ParenListExpr and treats
it as an initializer, i.e.
`-ParenListExpr 0xb40b31c650 <col:23, col:27> 'NULL TYPE'
  `-IntegerLiteral 0xb40b31c5f8 <col:24> 'int' 555

Expr::isConstantInitializer() considers such expressions as non-const, hence
the error.

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