Using system.h in configure

[Akim Demaille]

I'm slowly reaching a goal that does matter to me: exercising the
framework that I'd like to implement in Autoconf some day: something
like autosystem.h, and using system.h when running configure.  This
way we have the perfect match, the right check.

To this end, I need the following patch.  On my machine, suddenly
locale.h was rejected.  That was because of the ifndef HAVE_LOCALE_H
that #defined setlocale(x,y) to nothing, hence locale.h produced
errors, and was rejected.

But I'm also asking the permission to continue the change, i.e.:

- move src/system.h into ./system.h
  to avoid having to pass -I lib that results in using our getopt.h
  instead of the libc's, and boom.

- change configure.ac to use system.h instead of the default
  default (sic) includes.

OK?

Index: ChangeLog
from  Akim Demaille  <address@hidden>

        * src/system.h: Don't use #ifdef/#ifndef on HAVE_ values, only
        #if.

Index: src/system.h
===================================================================
RCS file: /cvsroot/bison/bison/src/system.h,v
retrieving revision 1.52
diff -u -u -r1.52 system.h
--- src/system.h 23 Oct 2002 16:30:50 -0000 1.52
+++ src/system.h 30 Oct 2002 08:22:12 -0000
@@ -18,7 +18,7 @@
 #ifndef BISON_SYSTEM_H
 #define BISON_SYSTEM_H
 
-#ifdef HAVE_CONFIG_H
+#if HAVE_CONFIG_H
 # include <config.h>
 #endif
 
@@ -103,27 +103,27 @@
 | Missing prototypes.  |
 `---------------------*/
 
-#if !HAVE_DECL_STPCPY
+#if defined HAVE_DECL_STPCPY && !HAVE_DECL_STPCPY
 char *stpcpy (char *dest, const char *src);
 #endif
 
-#if !HAVE_DECL_STRCHR
+#if defined HAVE_DECL_STRCHR && !HAVE_DECL_STRCHR
 char *strchr (const char *s, int c);
 #endif
 
-#if !HAVE_DECL_STRSPN
+#if defined HAVE_DECL_STRSPN && !HAVE_DECL_STRSPN
 size_t strspn (const char *s, const char *accept);
 #endif
 
-#if !HAVE_DECL_STRNLEN
+#if defined HAVE_DECL_STRNLEN && !HAVE_DECL_STRNLEN
 size_t strnlen (const char *s, size_t maxlen);
 #endif
 
-#if !HAVE_DECL_MEMCHR
+#if defined HAVE_DECL_MEMCHR && !HAVE_DECL_MEMCHR
 void *memchr (const void *s, int c, size_t n);
 #endif
 
-#if !HAVE_DECL_MEMRCHR
+#if defined HAVE_DECL_MEMRCHR && !HAVE_DECL_MEMRCHR
 void *memrchr (const void *s, int c, size_t n);
 #endif
 
@@ -160,10 +160,10 @@
 | NLS.  |
 `------*/
 
-#ifdef HAVE_LOCALE_H
+#if HAVE_LOCALE_H
 # include <locale.h>
 #endif
-#ifndef HAVE_SETLOCALE
+#if !HAVE_SETLOCALE
 # define setlocale(Category, Locale)
 #endif