[LLVMbugs] [Bug 8409] New: clang++ generates incorrect code for initializers of static members of class templates

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8409

           Summary: clang++ generates incorrect code for initializers of
                    static members of class templates
           Product: clang
           Version: 2.8
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: richard-llvm at metafoo.co.uk
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


Created an attachment (id=5633)
 --> (http://llvm.org/bugs/attachment.cgi?id=5633)
Testcase

Normally, when a class has a static member, no guard variable is needed to
prevent multiple initialization since the member can only be defined once.
However, if the class is a class template instance, then the member is
permitted to be defined multiple times (C++ 2003 3.2p5), and the compiler must
insert a guard variable to prevent multiple initialization (and hence multiple
destruction). But clang++ does not do this.

A testcase is attached; compile it with and without -DMAIN, and link the two
object files together. This should result in precisely one call to the K
constructor. However, clang++ calls the K constructor twice (at the same
address), and calls the K destructor twice on exit (again at the same address).

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