[RFC PATCH] Deprecate _REENTRANT and _THREAD_SAFE.

[Zack Weinberg]

On 12/06/2016 11:46 AM, Joseph Myers wrote:
> On Tue, 6 Dec 2016, Zack Weinberg wrote:
> 
>> -D_REENTRANT all by itself also won't, because _DEFAULT_SOURCE implies
>> _POSIX_C_SOURCE > 199506.  I could be persuaded to make that final
>> case also warn.
> 
> Given that GCC specs include %{pthread:-D_REENTRANT} (in many 
> architecture-specific specs), and that -pthread is (approximately) an 
> OS-independent way of saying to add whatever compiler and linker options 
> are needed for threads, I'd discourage warning in that case.

Yeah, that's plenty good enough reason not to warn.

zw