obstack.c uses unprotected __attribute__ directive

[Jim Meyering]

Hi,

obstack.c's uses of __attribute__ causes a compile failure
with non-gcc compilers:  E.g., with mips-sgi-irix6.2's cc

  cfe: Error: obstack.c, line 475: Syntax Error
   __attribute__ ((noreturn))
   ---------------^
  cfe: Error: obstack.c, line 475: Syntax Error
   __attribute__ ((noreturn))
   -------------------------^

Here's one way to fix it:

Index: obstack.c
===================================================================
RCS file: /fetish/cppi/obstack.c,v
retrieving revision 1.13
diff -u -1 -r1.13 obstack.c
--- obstack.c   2001/06/18 08:01:38     1.13
+++ obstack.c   2001/07/14 19:40:55
@@ -473,2 +473,9 @@
 
+#ifndef __attribute__
+/* This feature is available in gcc versions 2.5 and later.  */
+# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__
+#  define __attribute__(Spec) /* empty */
+# endif
+#endif
+
 static void