[Bug 215138] devel/libc++ + lang/gcc: #error <atomic> is not implemented

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215138

            Bug ID: 215138
           Summary: devel/libc++ + lang/gcc: #error <atomic> is not
                    implemented
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: needs-patch
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: gerald at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
          Assignee: gerald at FreeBSD.org
             Flags: maintainer-feedback?(gerald at FreeBSD.org)

Until OpenMP situation improves C++ ports have to resort to
USES=compiler:gcc-c++11-lib. However, libc++ from ports appears to be too old
to know about GCC atomic support.

$ pkg install -y gcc

$ cat >a.cc
#include <atomic>

int main() { return 0; }

$ g++49 -std=c++11 -nostdinc++ -isystem /usr/local/include/c++/v1 a.cc
In file included from a.cc:1:0:
/usr/local/include/c++/v1/atomic:539:2: error: #error <atomic> is not
implemented
 #error <atomic> is not implemented
  ^

$ find /usr/local/lib/gcc49 -name '*atomic*'
/usr/local/lib/gcc49/include/c++/ext/atomicity.h
/usr/local/lib/gcc49/include/c++/atomic
/usr/local/lib/gcc49/include/c++/i386-portbld-freebsd11.0/bits/atomic_word.h
/usr/local/lib/gcc49/include/c++/bits/atomic_lockfree_defines.h
/usr/local/lib/gcc49/include/c++/bits/atomic_base.h
/usr/local/lib/gcc49/libatomic.so
/usr/local/lib/gcc49/libatomic.so.1.1.0
/usr/local/lib/gcc49/libatomic.a
/usr/local/lib/gcc49/libatomic.so.1
/usr/local/lib/gcc49/gcc/i386-portbld-freebsd11.0/4.9.4/include/stdatomic.h

https://github.com/llvm-mirror/libcxx/commit/e8b4232e3
https://github.com/llvm-mirror/libcxx/commit/00f4a49b0

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