[RFC PATCH] Deprecate _REENTRANT and _THREAD_SAFE.

[Florian Weimer]

On 12/06/2016 04:22 PM, Zack Weinberg wrote:
> For many years, the only effect of these macros has been to make
> unistd.h declare getlogin_r.  _POSIX_C_SOURCE >= 199506L also causes
> this function to be declared.  However, people who don't carefully
> read all the headers might be confused into thinking they need to
> define _REENTRANT for any threaded code (as was indeed the case a long
> time ago).

You should get rid of the internal #define and #undef of _REENTRANT, too.

Thanks,
Florian