Add alloca-conf.h from libiberty.

include/ChangeLog

@@ -1,3 +1,7 @@
+2000-09-28  John David Anglin <dave@hiauly1.hia.nrc.ca>
+
+	* alloca-conf.h: New file (copied from libiberty).
+
 2000-09-05  John David Anglin <dave@hiauly1.hia.nrc.ca>
 
 	* md5.h (md5_uint32): Choose via INT_MAX instead of UINT_MAX.

include/alloca-conf.h

@@ -0,0 +1,24 @@
+#include "config.h"
+
+#if defined(__GNUC__) && !defined(C_ALLOCA)
+# ifndef alloca
+#  define alloca __builtin_alloca
+# endif
+#else /* ! defined (__GNUC__) */
+#  ifdef _AIX
+ #pragma alloca
+#  else
+#  if defined(HAVE_ALLOCA_H) && !defined(C_ALLOCA)
+#   include <alloca.h>
+#  else /* ! defined (HAVE_ALLOCA_H) */
+#   ifdef __STDC__
+extern PTR alloca (size_t);
+#   else /* ! defined (__STDC__) */
+extern PTR alloca ();
+#   endif /* ! defined (__STDC__) */
+#  endif /* ! defined (HAVE_ALLOCA_H) */
+#  ifdef _WIN32
+#   include <malloc.h>
+#  endif
+# endif /* ! defined (_AIX) */
+#endif /* ! defined (__GNUC__) */