Include <alloca.h> only if HAVE_ALLOCA.

(YYSTACK_USE_ALLOCA): Define to 0 if !HAVE_ALLOCA.
(YYMAXDEPTH): New macro.

diff --git a/lib/getdate.y b/lib/getdate.y
index 6ffee30b96ffb5a96162c45b69c6f44fca3cffb6..b57e6a56d3a2275be798ed4704e5372e42546134 100644 (file)
--- a/lib/getdate.y
+++ b/lib/getdate.y
@@ -36,7 +36,18 @@
 
 #include "getdate.h"
 
-#include <alloca.h>
+/* Use alloca only if it is known to be builtin.  */
+#if HAVE_ALLOCA
+# include <alloca.h>
+#else
+# define YYSTACK_USE_ALLOCA 0
+#endif
+
+/* Tell Bison ow much stack space is needed.  20 should be plenty for
+   this grammar, which is not right recursive.  Beware setting it too
+   high, since that might cause problems on machines whose alloca
+   implementations have lame stack-overflow checking.  */
+#define YYMAXDEPTH 20
 
 /* Since the code of getdate.y is not included in the Emacs executable
    itself, there is no need to #define static in this file.  Even if