[svn] New file.

src/config-post.h

@@ -0,0 +1,67 @@
+/* Some autoconf-unrelated preprocessor magic that needs to be done
+   before including the system includes and therefore cannot belong in
+   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 */
+char *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
+# ifdef __GNUC__
+/* Prevent stdio.h from declaring va_list and thus tripping gcc's
+   stdarg.h. */
+#  define _VA_LIST
+# endif
+#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 */