Compiling bison with non-GCC compilers

[Albert Chin-A-Young]

1. Non-GCC compilers don't have __attribute__
2. Don't assume __STDC__ is defined to 1. Just test if it is defined.
3. #include "system.h" in src/complain.c to get redefinition of
   __attribute__.
4. Variable 'n' unused in src/reduce.c

With these patches, bison 1.29 compiles with the vendor compilers for
Solaris 2.x, IRIX 6.x, Tru64 UNIX 4.0D, 5.x, AIX 4.3.2, and HP-UX
10.20, 11.00.

-- 
albert chin (address@hidden)

-- snip snip
--- src/system.h.orig   Mon Sep 17 19:41:39 2001
+++ src/system.h        Mon Sep 17 19:45:46 2001
@@ -99,7 +99,8 @@
 
 #ifndef __attribute__
 /* This feature is available in gcc versions 2.5 and later.  */
-# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__
+# if !defined (__GNUC__) || __GNUC__ < 2 || \
+(__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__
 #  define __attribute__(Spec) /* empty */
 # endif
 /* The __-protected variants of `format' and `printf' attributes
--- src/complain.h.orig Mon Sep 17 19:43:28 2001
+++ src/complain.h      Mon Sep 17 19:44:13 2001
@@ -23,7 +23,7 @@
 extern "C" {
 #endif
 
-#if defined (__STDC__) && __STDC__
+#ifdef __STDC__
 
 /* Informative messages, but we proceed. */
 
--- src/complain.c.orig Mon Sep 17 19:44:20 2001
+++ src/complain.c      Mon Sep 17 19:55:03 2001
@@ -19,14 +19,10 @@
 /* Based on error.c and error.h,
    written by David MacKenzie <address@hidden>.  */
 
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#include <stdio.h>
+#include "system.h"
 
 #if HAVE_VPRINTF || HAVE_DOPRNT || _LIBC
-# if __STDC__
+# ifdef __STDC__
 #  include <stdarg.h>
 #  define VA_START(args, lastarg) va_start(args, lastarg)
 # else
@@ -119,7 +115,7 @@
 `--------------------------------*/
 
 void
-#if defined VA_START && __STDC__
+#if defined VA_START && defined (__STDC__)
 warn (const char *message, ...)
 #else
 warn (message, va_alist)
@@ -171,7 +167,7 @@
 `-----------------------------------------------------------*/
 
 void
-#if defined VA_START && __STDC__
+#if defined VA_START && defined (__STDC__)
 complain (const char *message, ...)
 #else
 complain (message, va_alist)
@@ -221,7 +217,7 @@
 `-------------------------------------------------*/
 
 void
-#if defined VA_START && __STDC__
+#if defined VA_START && defined (__STDC__)
 fatal (const char *message, ...)
 #else
 fatal (message, va_alist)
@@ -259,7 +255,7 @@
 `------------------------------------------------------------------*/
 
 void
-#if defined VA_START && __STDC__
+#if defined VA_START && defined (__STDC__)
 error (int status, int errnum,
        const char *message, ...)
 #else
--- src/reduce.c.orig   Mon Sep 17 20:07:09 2001
+++ src/reduce.c        Mon Sep 17 20:19:25 2001
@@ -117,7 +117,7 @@
 useless_nonterminals (void)
 {
   BSet Np, Ns;
-  int i, n;
+  int i;
 
   /* N is set as built.  Np is set being built this iteration. P is
      set of all productions which have a RHS all in N.  */
@@ -140,7 +140,6 @@
      saved to be used when finding useful productions: only
      productions in this set will appear in the final grammar.  */
 
-  n = 0;
   while (1)
     {
       for (i = WORDSIZE (nvars) - 1; i >= 0; i--)
@@ -171,7 +170,7 @@
 inaccessable_symbols (void)
 {
   BSet Vp, Vs, Pp;
-  int i, n;
+  int i;
   short t;
   rule r;
 
@@ -207,7 +206,6 @@
 
   SETBIT (V, start_symbol);
 
-  n = 0;
   while (1)
     {
       for (i = WORDSIZE (nsyms) - 1; i >= 0; i--)