[Bug libc/21327] Libstdc++ would like another way to get some POSIX declarations that it currently gets via _GNU_SOURCE

["joseph at codesourcery dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21327

--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
I think the design needs to be discussed on libc-alpha, not in Bugzilla.  
My starting point would be that all relevant API symbols used in libstdc++ 
headers should get implementation-namespace API names, exported under some 
feature test macro, and that all relevant ABI symbols used in either 
libstdc++.so or via code in headers should get implementation-namespace 
ABI names (at public symbol versions).  (Relevant meaning used in the 
implementation of libstdc++ features from standard C++, as opposed to 
libstdc++ features that are GNU extensions to standard C++.  And by 
implementation-namespace I strictly mean not conflicting with symbols that 
users are allowed to use in their standard C++ programs, whether the 
technology used is __* symbols or ways to ensure symbol references bind to 
particular symbol versions without preemption by user code or something 
else.)

Cf. Florian's proposal 
<https://sourceware.org/ml/libc-alpha/2016-10/msg00294.html> (much of the 
discussion was in November).

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