Re: [PATCH] lib/stdio.in.h: define _POSIX_C_SOURCE on >=Sierra

[Paul Eggert]

On 11/7/23 13:53, Bruno Haible wrote:
> The problem is not with the older platforms; it's with the newer ones —
> including the newest one, 14.0.

Oh, sorry, my lack of macOS expertise is showing....


> > Alternatively, perhaps we should do something like the following? That
> > is, don't bother with pacification if sprintf and vsprintf are macros
> This approach won't work, because sprintf and vsprintf are defined as
> macros only in the system's <stdio.h>. But we need to decide whether to
> define _POSIX_C_SOURCE*before*  including the system's <stdio.h>.

OK, how about if we do something like this instead? I hope the "101300" 
is the right version, and the business with 
__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ is taken from unistd.in.h.

/* Suppress macOS deprecation warnings for sprintf and vsprintf.  */
#if (defined __APPLE__ && defined __MACH__) && !defined _POSIX_C_SOURCE
# ifdef __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
#  include <AvailabilityMacros.h>
# endif
# if (defined MAC_OS_X_VERSION_MIN_REQUIRED \
      && 101300 <= MAC_OS_X_VERSION_MIN_REQUIRED)
#  define _POSIX_C_SOURCE 200809L
#  define _GL_DEFINED__POSIX_C_SOURCE
# endif
#endif