[LLVMbugs] [Bug 18839] New: thread_local variable declaration treated as definition in direct linkage-specification

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18839

            Bug ID: 18839
           Summary: thread_local variable declaration treated as
                    definition in direct linkage-specification
           Product: clang
           Version: 3.4
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: filip.roseen at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 12062
  --> http://llvm.org/bugs/attachment.cgi?id=12062&action=edit
testcase.cpp

main.cpp:
--------------------------------------------------------------------------------
  extern "C++" thread_local int x;

  int main () {
    x = 123;
  }


clang++ -pthread -Wall -pedantic -std=c++11 main.cpp
--------------------------------------------------------------------------------
  <SUCCESS>

================================================================================

The standard states that a declaration directly contained in a
linkage-specification shall be treated as being declared as `extern`.

We should (with the above in mind) get a linker-error saying that `x` is
undefined within `main` but clang happily compiles our snippet.


gcc issues the correct diagnostic.



  [dcl.link] /7
  > A declaration directly contained in a linkage-specification is
  > treated as if it contains the extern specifier (7.11) for the
  > purpose of determining the linkage of the declared namd and
  > whether it is a definition. Such declaration shall not specify a
  > storage class.

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