[PATCH 1/2] Untangle stddef.h a little

[Maya Rashish <coypu@sdf.org>]

Of the currently supported BSDs:
- FreeBSD, doesn't have ansi.h or define _MACHINE_ANSI_H anywhere
in its other headers since the long-gone 5.x release.
- OpenBSD, DragonflyBSD don't have ansi.h either.
- NetBSD, sole remaining with ansi.h

Replace all the ifdef macros to be ifdef __NetBSD__ as it's the
sole remaining user.

Whether it is appropriate to make per-OS choices here is debatable,
but this change allows for further future cleanup.

This enables using the headers on netbsd archs that use different
include guards for ansi.h, like ARM.

(Note that netbsd's copy of GCC avoids this header entirely.)
Built tested on NetBSD-8.99.12/amd64.
---
 gcc/ginclude/stddef.h | 20 +++++---------------
 1 file changed, 5 insertions(+), 15 deletions(-)

diff --git a/gcc/ginclude/stddef.h b/gcc/ginclude/stddef.h
index 31b96a7e5..15a99e7da 100644
--- a/gcc/ginclude/stddef.h
+++ b/gcc/ginclude/stddef.h
@@ -46,9 +46,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 /* This avoids lossage on SunOS but only if stdtypes.h comes first.
    There's no way to win with the other order!  Sun lossage.  */
 
-/* On 4.3bsd-net2, make sure ansi.h is included, so we have
-   one less case to deal with in the following.  */
-#if defined (__BSD_NET2__) || defined (____386BSD____) || (defined (__FreeBSD__) && (__FreeBSD__ < 5)) || defined(__NetBSD__)
+#if defined(__NetBSD__)
 #include <machine/ansi.h>
 #endif
 /* On FreeBSD 5, machine/ansi.h does not exist anymore... */
@@ -56,11 +54,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #include <sys/_types.h>
 #endif
 
-/* In 4.3bsd-net2, machine/ansi.h defines these symbols, which are
-   defined if the corresponding type is *not* defined.
-   FreeBSD-2.1 defines _MACHINE_ANSI_H_ instead of _ANSI_H_.
-   NetBSD defines _I386_ANSI_H_ and _X86_64_ANSI_H_ instead of _ANSI_H_ */
-#if defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) || defined(_X86_64_ANSI_H_)  || defined(_I386_ANSI_H_)
+#if defined(__NetBSD__)
 #if !defined(_SIZE_T_) && !defined(_BSD_SIZE_T_)
 #define _SIZE_T
 #endif
@@ -87,7 +81,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #undef _WCHAR_T_
 #undef _BSD_WCHAR_T_
 #endif
-#endif /* defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) || defined(_X86_64_ANSI_H_) || defined(_I386_ANSI_H_) */
+#endif /* defined(__NetBSD__) */
 
 /* Sequent's header files use _PTRDIFF_T_ in some conflicting way.
    Just ignore it.  */
@@ -359,11 +353,7 @@ typedef __WINT_TYPE__ wint_t;
 #undef __need_wint_t
 #endif
 
-/*  In 4.3bsd-net2, leave these undefined to indicate that size_t, etc.
-    are already defined.  */
-/*  BSD/OS 3.1 and FreeBSD [23].x require the MACHINE_ANSI_H check here.  */
-/*  NetBSD 5 requires the I386_ANSI_H and X86_64_ANSI_H checks here.  */
-#if defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) || defined(_X86_64_ANSI_H_) || defined(_I386_ANSI_H_)
+#if defined(__NetBSD__)
 /*  The references to _GCC_PTRDIFF_T_, _GCC_SIZE_T_, and _GCC_WCHAR_T_
     are probably typos and should be removed before 2.8 is released.  */
 #ifdef _GCC_PTRDIFF_T_
@@ -391,7 +381,7 @@ typedef __WINT_TYPE__ wint_t;
 #undef _WCHAR_T_
 #undef _BSD_WCHAR_T_
 #endif
-#endif /* _ANSI_H_ || _MACHINE_ANSI_H_ || _X86_64_ANSI_H_ || _I386_ANSI_H_ */
+#endif /* __NetBSD__ */
 
 #endif /* __sys_stdtypes_h */
 
-- 
2.15.1