[PATCH] PR78968 add configure check for __cxa_thread_atexit in libc

[Jonathan Wakely]

On 04/01/17 15:42 +0000, Jonathan Wakely wrote:
>FreeBSD 11 adds __cxa_thread_atexit to libc, so we should use that
>instead of defining our own inferior version. This also avoids
>multiple definitions of the symbol.
>
>	PR libstdc++/78968
>	* config.h.in: Regenerate.
>	* configure: Likewise.
>	* configure.ac: Check for __cxa_thread_atexit.
>	* libsupc++/atexit_thread.cc [_GLIBCXX_HAVE___CXA_THREAD_ATEXIT]:
>	Don't define __cxa_thread_atexit if libc provides it.
>
>Tested powerpc64le-linux, committed to trunk.

This adds the check for freebsd cross-compilers. Tested by building
x86_64-unknown-freebsd11.0 on x86_64-uknown-linux-gnu.

Committed to trunk.

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