Patch: stdbool.h should be compatible with C++

[Martin v. Loewis]

> The following program:
> 
> ----------------------------
> #include <stdbool.h>
> bool foo;
> ----------------------------
> 
> could, with a little care, compile under C and C++.

Thanks for the proposal. Here is a patch for the mainline compiler.

1999-12-05  Martin v. Löwis  <loewis@informatik.hu-berlin.de>

	* ginclude/stdbool.h: Support compilation as C++.

Index: stdbool.h
===================================================================
RCS file: /cvs/gcc/egcs/gcc/ginclude/stdbool.h,v
retrieving revision 1.4
diff -u -r1.4 stdbool.h
--- stdbool.h	1999/09/23 18:02:55	1.4
+++ stdbool.h	1999/12/05 20:52:06
@@ -31,6 +31,7 @@
 #ifndef _STDBOOL_H
 #define _STDBOOL_H
 
+#ifndef __cplusplus
 /* The type `_Bool' must promote to `int' or `unsigned int'.  The constants
    `true' and `false' must have the value 0 and 1 respectively.  */
 typedef enum
@@ -45,6 +46,16 @@
 
 /* The macro `bool', which may be undefined, expands to _Bool.  */
 #define bool _Bool
+
+#else /* __cplusplus */
+
+/* Supporting <stdbool.h> in C++ is a GCC extension.  */
+#define _Bool	bool
+#define bool	bool
+#define false	false
+#define true	true
+
+#endif /* __cplusplus */
 
 /* Signal that all the definitions are present.  */
 #define __bool_true_false_are_defined	1