summaryrefslogtreecommitdiff
path: root/lib/stdbool.in.h
diff options
context:
space:
mode:
Diffstat (limited to 'lib/stdbool.in.h')
-rw-r--r--lib/stdbool.in.h56
1 files changed, 23 insertions, 33 deletions
diff --git a/lib/stdbool.in.h b/lib/stdbool.in.h
index fb1cde05..f2510a9e 100644
--- a/lib/stdbool.in.h
+++ b/lib/stdbool.in.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2001-2003, 2006-2015 Free Software Foundation, Inc.
+/* Copyright (C) 2001-2003, 2006-2010 Free Software Foundation, Inc.
Written by Bruno Haible <haible@clisp.cons.org>, 2001.
This program is free software; you can redistribute it and/or modify
@@ -12,7 +12,8 @@
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
- along with this program; if not, see <http://www.gnu.org/licenses/>. */
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#ifndef _GL_STDBOOL_H
#define _GL_STDBOOL_H
@@ -66,19 +67,24 @@
# undef true
#endif
-#ifdef __cplusplus
-# define _Bool bool
-# define bool bool
-#else
-# if defined __BEOS__ && !defined __HAIKU__
+/* For the sake of symbolic names in gdb, we define true and false as
+ enum constants, not only as macros.
+ It is tempting to write
+ typedef enum { false = 0, true = 1 } _Bool;
+ so that gdb prints values of type 'bool' symbolically. But if we do
+ this, values of type '_Bool' may promote to 'int' or 'unsigned int'
+ (see ISO C 99 6.7.2.2.(4)); however, '_Bool' must promote to 'int'
+ (see ISO C 99 6.3.1.1.(2)). So we add a negative value to the
+ enum; this ensures that '_Bool' promotes to 'int'. */
+#if defined __cplusplus || (defined __BEOS__ && !defined __HAIKU__)
/* A compiler known to have 'bool'. */
/* If the compiler already has both 'bool' and '_Bool', we can assume they
are the same types. */
-# if !@HAVE__BOOL@
+# if !@HAVE__BOOL@
typedef bool _Bool;
-# endif
-# else
-# if !defined __GNUC__
+# endif
+#else
+# if !defined __GNUC__
/* If @HAVE__BOOL@:
Some HP-UX cc and AIX IBM C compiler versions have compiler bugs when
the built-in _Bool type is used. See
@@ -98,35 +104,19 @@ typedef bool _Bool;
"Invalid enumerator. (badenum)" with HP-UX cc on Tru64.
The only benefit of the enum, debuggability, is not important
with these compilers. So use 'signed char' and no enum. */
-# define _Bool signed char
-# else
+# define _Bool signed char
+# else
/* With this compiler, trust the _Bool type if the compiler has it. */
-# if !@HAVE__BOOL@
- /* For the sake of symbolic names in gdb, define true and false as
- enum constants, not only as macros.
- It is tempting to write
- typedef enum { false = 0, true = 1 } _Bool;
- so that gdb prints values of type 'bool' symbolically. But then
- values of type '_Bool' might promote to 'int' or 'unsigned int'
- (see ISO C 99 6.7.2.2.(4)); however, '_Bool' must promote to 'int'
- (see ISO C 99 6.3.1.1.(2)). So add a negative value to the
- enum; this ensures that '_Bool' promotes to 'int'. */
+# if !@HAVE__BOOL@
typedef enum { _Bool_must_promote_to_int = -1, false = 0, true = 1 } _Bool;
-# endif
# endif
# endif
-# define bool _Bool
#endif
+#define bool _Bool
/* The other macros must be usable in preprocessor directives. */
-#ifdef __cplusplus
-# define false false
-# define true true
-#else
-# define false 0
-# define true 1
-#endif
-
+#define false 0
+#define true 1
#define __bool_true_false_are_defined 1
#endif /* _GL_STDBOOL_H */