[committed] libstdc++: Pass CXXFLAGS to check_performance script

[Jonathan Wakely]

On 09/10/20 14:02 +0100, Jonathan Wakely wrote:
>It looks like our check-performance target runs completely unoptimized,
>which is a bit silly. This exports the CXXFLAGS from the parent make
>process to the check_performance script.
>
>libstdc++-v3/ChangeLog:
>
>	* scripts/check_performance: Use gnu++11 instead of gnu++0x.
>	* testsuite/Makefile.am (check-performance): Export CXXFLAGS to
>	child process.
>	* testsuite/Makefile.in: Regenerate.

A small adjustment to that last patch.

Tested powerpc64le-linux. Committed to trunk.



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