diff options
Diffstat (limited to 'lib/stdbool.mini.h')
| -rw-r--r-- | lib/stdbool.mini.h | 80 |
1 files changed, 46 insertions, 34 deletions
diff --git a/lib/stdbool.mini.h b/lib/stdbool.mini.h index cd36146f..c183f75a 100644 --- a/lib/stdbool.mini.h +++ b/lib/stdbool.mini.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2001-2003, 2006-2009 Free Software Foundation, Inc. +/* Copyright (C) 2001-2003, 2006-2017 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 @@ -49,50 +49,62 @@ with this substitute. With this substitute, only the values 0 and 1 give the expected result when converted to _Bool' or 'bool'. + - C99 allows the use of (_Bool)0.0 in constant expressions, but + this substitute cannot always provide this property. + Also, it is suggested that programs use 'bool' rather than '_Bool'; this isn't required, but 'bool' is more common. */ /* 7.16. Boolean type and values */ -/* 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 +#ifdef __cplusplus /* Assume the compiler has 'bool' and '_Bool'. */ #else - /* 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". - Even the existence of an enum type, without a typedef, - "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 + /* <stdbool.h> is known to exist and work with the following compilers: + - GNU C 3.0 or newer, on any platform, + - Intel C, + - MSVC 12 (Visual Studio 2013) or newer, + - Sun C, on Solaris, if _STDC_C99 is defined, + - AIX xlc, if _ANSI_C_SOURCE is defined, + - HP C, on HP-UX 11.31 or newer. + It is know not to work with: + - Sun C, on Solaris, if __C99FEATURES__ is defined but _STDC_C99 is not, + - MIPSpro C 7.30, on IRIX. */ +# if (__GNUC__ >= 3) \ + || defined __INTEL_COMPILER \ + || (_MSC_VER >= 1800) \ + || (defined __SUNPRO_C && defined _STDC_C99) \ + || (defined _AIX && !defined __GNUC__ && defined _ANSI_C_SOURCE) \ + || defined __HP_cc + /* Assume the compiler has <stdbool.h>. */ +# include <stdbool.h> +# else + /* 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". + Even the existence of an enum type, without a typedef, + "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 +# define bool _Bool +# endif #endif -#define bool _Bool /* The other macros must be usable in preprocessor directives. */ -#define false 0 -#define true 1 +#ifdef __cplusplus +# define false false +# define true true +#else +# undef false +# define false 0 +# undef true +# define true 1 +#endif + #define __bool_true_false_are_defined 1 #endif /* _UNISTRING_STDBOOL_H */ |