/* Some autoconf-unrelated preprocessor magic that needs to be done
   *before* including the system includes and therefore cannot belong
   in sysdep.h.

   Everything else related to system tweaking belongs to sysdep.h.

   This file is included at the bottom of config.h.  */

/* Alloca-related defines, straight out of the Autoconf manual. */

/* AIX requires this to be the first thing in the file.  */
#ifndef __GNUC__
# if HAVE_ALLOCA_H
#  include <alloca.h>
# else
#  ifdef _AIX
 #pragma alloca
#  else
#   ifndef alloca /* predefined by HP cc +Olibcalls */
void *alloca ();
#   endif
#  endif
# endif
#endif

#ifdef __sun
# ifdef __SVR4
#  define solaris
# endif
#endif

/* The "namespace tweaks" below attempt to set a friendly "compilation
   environment" under popular operating systems.  Default compilation
   environment often means that some functions that are "extensions"
   are not declared -- `strptime' is one example.

   But non-default environments can expose bugs in the system header
   files, crippling compilation in _very_ non-obvious ways.  Because
   of that, we define them only on well-tested architectures where we
   know they will work.  */

#undef NAMESPACE_TWEAKS

#ifdef solaris
# define NAMESPACE_TWEAKS
#endif

#ifdef __linux__
# define NAMESPACE_TWEAKS
#endif

#ifdef NAMESPACE_TWEAKS

/* Request the "Unix 98 compilation environment". */
#define _XOPEN_SOURCE 500

/* For Solaris: request everything else that is available and doesn't
   conflict with the above.  */
#define __EXTENSIONS__

/* For Linux: request features of 4.3BSD and SVID (System V Interface
   Definition). */
#define _SVID_SOURCE
#define _BSD_SOURCE

#endif /* NAMESPACE_TWEAKS */