diff options
Diffstat (limited to 'lib/stdbool.in.h')
| -rw-r--r-- | lib/stdbool.in.h | 56 |
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 */ |