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From: <ams AT ludd DOT ltu DOT se>
Message-Id: <200412311451.iBVEpBFq001103@speedy.ludd.ltu.se>
Subject: restrict keyword
To: DJGPP-WORKERS <djgpp-workers AT delorie DOT com>
Date: Fri, 31 Dec 2004 15:51:11 +0100 (CET)
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X-MailScanner-From: ams AT ludd DOT ltu DOT se
Reply-To: djgpp-workers AT delorie DOT com

Hello.

A long time ago I added restrict to my DJGPP headers as per C99.
E.g. here's the patch for time.h (pasted):

Index: djgpp/include/time.h
===================================================================
RCS file: /cvs/djgpp/djgpp/include/time.h,v
retrieving revision 1.8
diff -p -u -r1.8 time.h
--- djgpp/include/time.h        16 Feb 2003 04:01:49 -0000      1.8
+++ djgpp/include/time.h        29 Dec 2004 15:51:25 -0000
@@ -57,7 +57,7 @@ double                difftime(time_t _t1, time_t _t0)
 struct tm *    gmtime(const time_t *_tod);
 struct tm *    localtime(const time_t *_tod);
 time_t         mktime(struct tm *_tptr);
-size_t         strftime(char *_s, size_t _n, const char *_format, const struct tm *_tptr);
+size_t         strftime(char * restrict _s, size_t _n, const char *restrict _format, const struct tm * restrict _tptr);
 time_t         time(time_t *_tod);
 
 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) \


As I'm using GCC 2.953 I added something like this as well:

Index: djgpp/include/sys/version.h
===================================================================
RCS file: /cvs/djgpp/djgpp/include/sys/version.h,v
retrieving revision 1.5
diff -p -u -r1.5 version.h
--- djgpp/include/sys/version.h 17 Oct 2002 23:00:24 -0000      1.5
+++ djgpp/include/sys/version.h 29 Dec 2004 15:51:25 -0000
@@ -1,3 +1,4 @@
+/* Copyright (C) 2003 DJ Delorie, see COPYING.DJ for details */
 /* Copyright (C) 2002 DJ Delorie, see COPYING.DJ for details */
 /* Copyright (C) 1999 DJ Delorie, see COPYING.DJ for details */
 /* Copyright (C) 1998 DJ Delorie, see COPYING.DJ for details */
@@ -18,3 +19,6 @@
 #define __DJGPP_MINOR 4
 #define __DJGPP_MINOR__ 4
 
+#if __GNUC__ < 3 /* || (__GNUC__ == 3 && __GNUC_MINOR__ < 1)*/
+#define restrict
+#endif

I also tried the current GCC of that time. It didn't support restrict
either, hence the commented out part above. Or rather I don't know
exactly why I have commented it out. What I do remember I couldn't get
it to work and gave up on GCC >= 3.


Do we want this commited? I think yes.

Does anyone know the earliest GCC version that supports restrict, if
any? I.e. what should the line
+#if __GNUC__ < 3  || (__GNUC__ == 3 && __GNUC_MINOR__ < 1)
look like?

I'm not sure the right place for it is in <sys/version.h> but it
seemed like a good place with regard to getting it defined
everywhere. I'm open for suggestions.


Right,

						MartinS