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Side by Side Diff: bison/src/bison/2.4.1/bison-2.4.1-src/lib/stdbool.in.h

Issue 10807020: Add native Windows binary for bison. (Closed) Base URL: svn://chrome-svn/chrome/trunk/deps/third_party/
Patch Set: Created 8 years, 5 months ago
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1 /* -*- buffer-read-only: t -*- vi: set ro: */
2 /* DO NOT EDIT! GENERATED AUTOMATICALLY! */
3 /* Copyright (C) 2001-2003, 2006-2008 Free Software Foundation, Inc.
4 Written by Bruno Haible <haible@clisp.cons.org>, 2001.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
9 any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
19
20 #ifndef _GL_STDBOOL_H
21 #define _GL_STDBOOL_H
22
23 /* ISO C 99 <stdbool.h> for platforms that lack it. */
24
25 /* Usage suggestions:
26
27 Programs that use <stdbool.h> should be aware of some limitations
28 and standards compliance issues.
29
30 Standards compliance:
31
32 - <stdbool.h> must be #included before 'bool', 'false', 'true'
33 can be used.
34
35 - You cannot assume that sizeof (bool) == 1.
36
37 - Programs should not undefine the macros bool, true, and false,
38 as C99 lists that as an "obsolescent feature".
39
40 Limitations of this substitute, when used in a C89 environment:
41
42 - <stdbool.h> must be #included before the '_Bool' type can be used.
43
44 - You cannot assume that _Bool is a typedef; it might be a macro.
45
46 - Bit-fields of type 'bool' are not supported. Portable code
47 should use 'unsigned int foo : 1;' rather than 'bool foo : 1;'.
48
49 - In C99, casts and automatic conversions to '_Bool' or 'bool' are
50 performed in such a way that every nonzero value gets converted
51 to 'true', and zero gets converted to 'false'. This doesn't work
52 with this substitute. With this substitute, only the values 0 and 1
53 give the expected result when converted to _Bool' or 'bool'.
54
55 Also, it is suggested that programs use 'bool' rather than '_Bool';
56 this isn't required, but 'bool' is more common. */
57
58
59 /* 7.16. Boolean type and values */
60
61 /* BeOS <sys/socket.h> already #defines false 0, true 1. We use the same
62 definitions below, but temporarily we have to #undef them. */
63 #if defined __BEOS__ && !defined __HAIKU__
64 # include <OS.h> /* defines bool but not _Bool */
65 # undef false
66 # undef true
67 #endif
68
69 /* For the sake of symbolic names in gdb, we define true and false as
70 enum constants, not only as macros.
71 It is tempting to write
72 typedef enum { false = 0, true = 1 } _Bool;
73 so that gdb prints values of type 'bool' symbolically. But if we do
74 this, values of type '_Bool' may promote to 'int' or 'unsigned int'
75 (see ISO C 99 6.7.2.2.(4)); however, '_Bool' must promote to 'int'
76 (see ISO C 99 6.3.1.1.(2)). So we add a negative value to the
77 enum; this ensures that '_Bool' promotes to 'int'. */
78 #if defined __cplusplus || (defined __BEOS__ && !defined __HAIKU__)
79 /* A compiler known to have 'bool'. */
80 /* If the compiler already has both 'bool' and '_Bool', we can assume they
81 are the same types. */
82 # if !@HAVE__BOOL@
83 typedef bool _Bool;
84 # endif
85 #else
86 # if !defined __GNUC__
87 /* If @HAVE__BOOL@:
88 Some HP-UX cc and AIX IBM C compiler versions have compiler bugs when
89 the built-in _Bool type is used. See
90 http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
91 http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html
92 http://lists.gnu.org/archive/html/bug-coreutils/2005-10/msg00086.html
93 Similar bugs are likely with other compilers as well; this file
94 wouldn't be used if <stdbool.h> was working.
95 So we override the _Bool type.
96 If !@HAVE__BOOL@:
97 Need to define _Bool ourselves. As 'signed char' or as an enum type?
98 Use of a typedef, with SunPRO C, leads to a stupid
99 "warning: _Bool is a keyword in ISO C99".
100 Use of an enum type, with IRIX cc, leads to a stupid
101 "warning(1185): enumerated type mixed with another type".
102 Even the existence of an enum type, without a typedef,
103 "Invalid enumerator. (badenum)" with HP-UX cc on Tru64.
104 The only benefit of the enum, debuggability, is not important
105 with these compilers. So use 'signed char' and no enum. */
106 # define _Bool signed char
107 # else
108 /* With this compiler, trust the _Bool type if the compiler has it. */
109 # if !@HAVE__BOOL@
110 typedef enum { _Bool_must_promote_to_int = -1, false = 0, true = 1 } _Bool;
111 # endif
112 # endif
113 #endif
114 #define bool _Bool
115
116 /* The other macros must be usable in preprocessor directives. */
117 #define false 0
118 #define true 1
119 #define __bool_true_false_are_defined 1
120
121 #endif /* _GL_STDBOOL_H */
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