[PATCH] PR libstdc++/81221 fix namespace qualification for parallel mode

[Jonathan Wakely]

On 27/06/17 15:46 +0100, Jonathan Wakely wrote:
>std::sample needs to call _GLIBCXX_STD_A::__sample instead of
>std::__sample, so that it works when Parallel Mode is active.
>
>	PR libstdc++/81221
>	* include/bits/stl_algo.h (sample): Qualify with _GLIBCXX_STD_A not
>	std.
>	* testsuite/25_algorithms/sample/81221.cc: New.
>
>Tested powerpc64le-linux, committed to trunk, and will commit to the
>gcc-7-branch shortly.

I forgot that tests can't use -D_GLIBCXX_PARALLEL if libgomp isn't
available. This makes it conditional on running "make check-parallel"

Commnitted to trunk.

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