diff options
Diffstat (limited to 'lib/stdbool_.h')
| -rw-r--r-- | lib/stdbool_.h | 38 |
1 files changed, 30 insertions, 8 deletions
diff --git a/lib/stdbool_.h b/lib/stdbool_.h index 3177ae0..efa80ba 100644 --- a/lib/stdbool_.h +++ b/lib/stdbool_.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc. +/* Copyright (C) 2001, 2002, 2003, 2006 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 @@ -70,18 +70,40 @@ (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__) +#if defined __cplusplus || defined __BEOS__ + /* 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 defined __SUNPRO_C && (__SUNPRO_C < 0x550 || __STDC__ == 1) - /* Avoid stupid "warning: _Bool is a keyword in ISO C99". */ -# define _Bool signed char +typedef bool _Bool; +# 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 + http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html + http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html + http://lists.gnu.org/archive/html/bug-coreutils/2005-10/msg00086.html + Similar bugs are likely with other compilers as well; this file + wouldn't be used if <stdbool.h> was working. + So we override the _Bool type. + If !@HAVE__BOOL@: + Need to define _Bool ourselves. As 'signed char' or as an enum type? + Use of a typedef, with SunPRO C, leads to a stupid + "warning: _Bool is a keyword in ISO C99". + Use of an enum type, with IRIX cc, leads to a stupid + "warning(1185): enumerated type mixed with another type". + The only benefit of the enum type, debuggability, is not important + with these compilers. So use 'signed char' and no typedef. */ +# define _Bool signed char enum { false = 0, true = 1 }; -# else +# else + /* With this compiler, trust the _Bool type if the compiler has it. */ +# if !@HAVE__BOOL@ typedef enum { _Bool_must_promote_to_int = -1, false = 0, true = 1 } _Bool; # endif # endif -#else -typedef bool _Bool; #endif #define bool _Bool |