Re: [PATCH] Feature test macros overhaul: string.h and strings.h overlaps

[Yaakov Selkowitz <yselkowitz at cygwin dot com>]

On 2016-04-14 09:16, Eric Blake wrote:
> On 04/13/2016 10:55 PM, Yaakov Selkowitz wrote:
> > +#if __BSD_VISIBLE /* POSIX declaration is in <strings.h> */
> >   int	 _EXFUN(strcasecmp,(const char *, const char *));
> >   #endif
>
> POSIX says <string.h> can declare ANY str* function without it being
> namespace pollution, so _this_ particular duplicate is not only okay,
> but there are programs that have come to rely on it being duplicated
> here, the way glibc does it (yes, those programs SHOULD be using
> <strings.h>, but it doesn't hurt to copy glibc).

This is exactly how glibc does it: these functions are only in 
<string.h> for BSD compatibility (which is also the default, or with 
_GNU_SOURCE).  However when POSIX is specified then the declarations are 
only in <strings.h>.

--
Yaakov