[PATCH] Avoid defining size_t in ctype.h, wctype.h and signal.h for -std=c99 -pedantic

[Jakub Jelinek <jakub at redhat dot com>]

Hi!

As CONFORMANCE notes, these headers aren't supposed to define size_t
(except that signal.h is not supposed to define size_t in ISO C99
and is supposed to define it in XPG6 or whenever struct sigstack is
defined).  Not sure why bits/types.h has been defining it, it is much
cleaner if it just defines only __*_t types.  Most of the headers that
actually need size_t were already explicitly or implicitly making
sure they get the type defined (be it #define __need_size_t #include <stddef.h>,
or #include <sys/types.h>, or #include <stdlib.h>, or #include <string.h>,
or #include <stdio.h>), there were just a few headers that needed some
tweaking.
I did make install-headers with this into an empty directory on
x86_64-linux, and tried to compile all headers one by one into .s with
various feature test macros to make sure this doesn't cause regressions,
additionally I have grepped gcc -E -D_XOPEN_SOURCE={500,600} outputs
of including headers that XPG* requires to define size_t or in the
prototypes/struct definitions use size_t and also grepped all headers
in libc tree which use size_t and don't necessarily make sure it is
included.
This is what I fond:

2007-07-17  Jakub Jelinek  <jakub@redhat.com>

	* bits/types.h: Don't include stddef.h, don't define __need_size_t.
	* signal/signal.h <__USE_BSD || __USE_XOPEN_EXTENDED>: Define
	__need_size_t and include stddef.h.
	* sysvipc/sys/msg.h: Likewise.
	* posix/sched.h: Likewise.
	* hurd/hurd/signal.h (__need_size_t): Define.

	* CONFORMANCE: ctype.h and wctype.h no longer define size_t,
	neither does signal.h in pedantic ISO C namespaces.  stdio.h
	no longer defines wint_t or wchar_t.

--- libc/bits/types.h.jj	2005-02-22 00:11:47.000000000 +0100
+++ libc/bits/types.h	2007-07-17 18:41:03.000000000 +0200
@@ -1,5 +1,5 @@
 /* bits/types.h -- definitions of __*_t types underlying *_t types.
-   Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -27,9 +27,6 @@
 #include <features.h>
 #include <bits/wordsize.h>
 
-#define __need_size_t
-#include <stddef.h>
-
 /* Convenience types.  */
 typedef unsigned char __u_char;
 typedef unsigned short int __u_short;
--- libc/signal/signal.h.jj	2004-11-20 18:57:35.000000000 +0100
+++ libc/signal/signal.h	2007-07-17 18:45:27.000000000 +0200
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2003, 2004 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2003, 2004, 2007 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -339,6 +339,8 @@ extern int sigreturn (struct sigcontext 
 
 
 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
+# define __need_size_t
+# include <stddef.h>
 
 /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
    (causing them to fail with EINTR); if INTERRUPT is zero, make system
--- libc/sysvipc/sys/msg.h.jj	2006-08-03 17:38:26.000000000 +0200
+++ libc/sysvipc/sys/msg.h	2007-07-17 18:47:17.000000000 +0200
@@ -1,4 +1,5 @@
-/* Copyright (C) 1995-1997,1999,2000,2003,2006 Free Software Foundation, Inc.
+/* Copyright (C) 1995-1997,1999,2000,2003,2006,2007
+   Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -21,6 +22,9 @@
 
 #include <features.h>
 
+#define __need_size_t
+#include <stddef.h>
+
 /* Get common definition of System V style IPC.  */
 #include <sys/ipc.h>
 
--- libc/posix/sched.h.jj	2007-04-23 10:54:03.000000000 +0200
+++ libc/posix/sched.h	2007-07-17 18:42:23.000000000 +0200
@@ -25,6 +25,9 @@
 /* Get type definitions.  */
 #include <bits/types.h>
 
+#define __need_size_t
+#include <stddef.h>
+
 #define __need_timespec
 #include <time.h>
 
--- libc/hurd/hurd/signal.h.jj	2007-03-21 21:22:16.000000000 +0100
+++ libc/hurd/hurd/signal.h	2007-07-17 18:44:33.000000000 +0200
@@ -26,6 +26,7 @@
 #error "Must have `_GNU_SOURCE' feature test macro to use this file"
 #endif
 
+#define __need_size_t
 #define __need_NULL
 #include <stddef.h>
 
--- libc/CONFORMANCE.jj	2004-04-17 19:43:48.000000000 +0200
+++ libc/CONFORMANCE	2007-07-17 19:08:34.000000000 +0200
@@ -184,15 +184,7 @@ Also, the Single Unix Specification gene
 be included in headers (if _XOPEN_SOURCE is defined appropriately)
 than ISO C permits.
 
-<ctype.h> should not declare size_t.
-
-<signal.h> should not declare size_t.
-
-<stdio.h> should not declare or use wchar_t or wint_t.
-
 <wchar.h> does not support AMD1; to support it, the functions
 fwprintf, fwscanf, wprintf, wscanf, swprintf, swscanf, vfwprintf,
 vwprintf, vswprintf and fwide would need to be declared when
 __STDC_VERSION__ >= 199409L and not just for C99.
-
-<wctype.h> should not declare size_t.

	Jakub