Merged in autoconf branch. This provides configuration via the autoconf

system.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7014 91177308-0d34-0410-b5e6-96231b3b80d8

include/Config/alloca.h

@@ -0,0 +1,46 @@
+/*
+ * Header file: alloc.h
+ *
+ * Description:
+ *	This header file includes the infamous alloc.h header file if the
+ *	autoconf system has found it.  It hides all of the autoconf details
+ *	from the rest of the application source code.
+ */
+
+#ifndef _CONFIG_ALLOC_H
+#define _CONFIG_ALLOC_H
+
+#include "Config/config.h"
+
+/*
+ * This is a modified version of that suggested by the Autoconf manual.
+ *	1) The #pragma is indented so that pre-ANSI C compilers ignore it.
+ *	2) If alloca.h cannot be found, then try stdlib.h.  Some platforms
+ *	   (notably FreeBSD) defined alloca() there.
+ */
+#ifndef __GNUC__
+#	ifdef HAVE_ALLOCA_H
+#		include <alloca.h>
+#	else
+#		ifdef _AIX
+ #			pragma alloca
+#		else
+#			ifndef alloca
+				char * alloca ();
+#			endif
+#		endif
+#	endif
+#else
+#	ifdef HAVE_ALLOCA_H
+#		include <alloca.h>
+#	else
+#		ifdef HAVE_STDLIB_H
+#			include <stdlib.h>
+#		else
+#			error "The function alloca() is required but not found!"
+#		endif
+#	endif
+#endif
+
+#endif
+