[patch] libstdc++/69386 Ensure C++ language linkage in cmath and cstdlib

[Jonathan Wakely]

On 21/01/16 10:27 +0100, Dominique d'Humières wrote:
>Jonathan,
>>     PR libstdc++/69386
>>     * include/c_global/ccomplex: Ensure C++ language linkage.
>>     * include/c_global/cmath: Likewise.
>>     * include/c_global/cstdlib: Likewise.
>>     * include/c_global/ctgmath: Likewise.
>>     * testsuite/17_intro/headers/c++2011/linkage.cc: New.
>
>The test  testsuite/17_intro/headers/c++2011/linkage.cc fails on darwin
>
>/opt/gcc/work/libstdc++-v3/testsuite/17_intro/headers/c++2011/linkage.cc:47:19: fatal error: uchar.h: No such file or directory

I should have been checking which headers are actually supported,
fixed like this. This also adds extern "C++" to some more headers, so
that the order of including <math.h> and <complex.h> doesn't matter.

Tested powerpc64le-linux, committed to trunk.

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