[PATCH] Enable libstdc++ numeric conversions on Cygwin

[Jonathan Wakely]

On 15/11/15 09:58 +0100, Christophe Lyon wrote:
>Ha, and my newlib copy is not very recent, it's from Oct 30th 2013:
>maybe it's too old?

The autoconf checks should handle old versions as well as new.

The problem is I didn't change a defined(_GLIBCXX_USE_C99_WCHAR) to
just test its value, rather than whether it's defined.

As I added to include/bits/c++config on Friday:

// N.B. these _GLIBCXX_USE_C99_XXX macros are defined unconditionally
// so they should be tested with #if not with #ifdef.

Fixed with this patch, committed to trunk.

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