[llvm-bugs] [Bug 27058] New: ThreadPool.h fails to build with gcc 5.3.2 when cross-compiling for powerpc64

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27058

            Bug ID: 27058
           Summary: ThreadPool.h fails to build with gcc 5.3.2 when
                    cross-compiling for powerpc64
           Product: libraries
           Version: 3.8
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Support Libraries
          Assignee: unassignedbugs at nondot.org
          Reporter: bryan at shatow.net
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

In file included from
/root/git/freebsd/lib/clang/libllvmsupport/../../../contrib/llvm/lib/Support/ThreadPool.cpp:14:0:
/root/git/freebsd/lib/clang/libllvmsupport/../../../contrib/llvm/include/llvm/Support/ThreadPool.h:127:8:
error: 'atomic' in namespace 'std' does not name a template type
   std::atomic<unsigned> ActiveThreads;
        ^

Came from http://reviews.llvm.org/D15464 r255593.

Simple patch attached.

I'm unable to reproduce without using a powerpc64 cross-compiler so I'm not
sure exactly what is going on here as gcc 4.9-6 all work fine when not
cross-compiling.

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