_GLIBCXX_USE_C99 not working?

[Brian Dessent]

Dave Korn wrote:

>   Can you point me at any documentation that says this is a valid thing to do?
> AFAICT that's an internal symbol in the '_' namespace that user code has no
> business messing around with.  Cygwin is not a glibc program so telling
> libstdc that it is seems inherently bogus to me.

You're right that it's an internal gcc symbol, but the "_GLIBCXX"
preprocessor namespace belongs/refers to libstdc++ not glibc, so in this
case it's not necessarily got anything to do with glibc, rather just
indicating target libc C99 support is available to be used by libstdc++.

Brian

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