- in version 1.23 of Bison. */
-
-#ifndef alloca
-#ifdef __GNUC__
-#define alloca __builtin_alloca
-#else /* not GNU C. */
-#if (!defined (__STDC__) && defined (sparc)) || defined (__sparc__) || defined (__sparc) || defined (__sgi)
-#include <alloca.h>
-#else /* not sparc */
-#if defined (MSDOS) && !defined (__TURBOC__)
-#include <malloc.h>
-#else /* not MSDOS, or __TURBOC__ */
-#if defined(_AIX)
-#include <malloc.h>
+ in version 1.24 of Bison. */
+
+/* This is the parser code that is written into each bison parser when
+ the %semantic_parser declaration is not specified in the grammar.
+ It was written by Richard Stallman by simplifying the hairy parser
+ used when %semantic_parser is specified. */
+
+#ifndef YYSTACK_USE_ALLOCA
+# ifdef alloca
+# define YYSTACK_USE_ALLOCA
+# else /* alloca not defined */
+# ifdef __GNUC__
+# define YYSTACK_USE_ALLOCA
+# define alloca __builtin_alloca
+# else /* not GNU C. */
+# if (!defined (__STDC__) && defined (sparc)) || defined (__sparc__) || defined (__sparc) || defined (__sgi) || (defined (__sun) && defined (__i386))
+# define YYSTACK_USE_ALLOCA
+# include <alloca.h>
+# else /* not sparc */
+ /* We think this test detects Watcom and Microsoft C. */
+ /* This used to test MSDOS, but that is a bad idea since that
+ symbol is in the user namespace. */
+# if (defined (_MSDOS) || defined (_MSDOS_)) && !defined (__TURBOC__)
+# if 0
+ /* No need for malloc.h, which pollutes the namespace; instead,
+ just don't use alloca. */
+# include <malloc.h>
+# endif
+# else /* not MSDOS, or __TURBOC__ */
+# if defined(_AIX)
+ /* I don't know what this was needed for, but it pollutes the
+ namespace. So I turned it off. rms, 2 May 1997. */
+ /* #include <malloc.h> */