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5191 | serge | 1 | /* ANSI and traditional C compatability macros |
6324 | serge | 2 | Copyright (C) 1991-2015 Free Software Foundation, Inc. |
5191 | serge | 3 | This file is part of the GNU C Library. |
4 | |||
5 | This program is free software; you can redistribute it and/or modify |
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6 | it under the terms of the GNU General Public License as published by |
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7 | the Free Software Foundation; either version 2 of the License, or |
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8 | (at your option) any later version. |
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9 | |||
10 | This program is distributed in the hope that it will be useful, |
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11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 | GNU General Public License for more details. |
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14 | |||
15 | You should have received a copy of the GNU General Public License |
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16 | along with this program; if not, write to the Free Software |
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17 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
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18 | |||
19 | /* ANSI and traditional C compatibility macros |
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20 | |||
21 | ANSI C is assumed if __STDC__ is #defined. |
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22 | |||
23 | Macro ANSI C definition Traditional C definition |
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24 | ----- ---- - ---------- ----------- - ---------- |
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25 | PTR `void *' `char *' |
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26 | const not defined `' |
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27 | volatile not defined `' |
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28 | signed not defined `' |
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29 | |||
30 | For ease of writing code which uses GCC extensions but needs to be |
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31 | portable to other compilers, we provide the GCC_VERSION macro that |
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32 | simplifies testing __GNUC__ and __GNUC_MINOR__ together, and various |
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33 | wrappers around __attribute__. Also, __extension__ will be #defined |
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6324 | serge | 34 | to nothing if it doesn't work. See below. */ |
5191 | serge | 35 | |
36 | #ifndef _ANSIDECL_H |
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37 | #define _ANSIDECL_H 1 |
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38 | |||
39 | #ifdef __cplusplus |
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40 | extern "C" { |
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41 | #endif |
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42 | |||
43 | /* Every source file includes this file, |
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44 | so they will all get the switch for lint. */ |
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45 | /* LINTLIBRARY */ |
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46 | |||
47 | /* Using MACRO(x,y) in cpp #if conditionals does not work with some |
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48 | older preprocessors. Thus we can't define something like this: |
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49 | |||
50 | #define HAVE_GCC_VERSION(MAJOR, MINOR) \ |
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51 | (__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR))) |
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52 | |||
53 | and then test "#if HAVE_GCC_VERSION(2,7)". |
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54 | |||
55 | So instead we use the macro below and test it against specific values. */ |
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56 | |||
57 | /* This macro simplifies testing whether we are using gcc, and if it |
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58 | is of a particular minimum version. (Both major & minor numbers are |
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59 | significant.) This macro will evaluate to 0 if we are not using |
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60 | gcc at all. */ |
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61 | #ifndef GCC_VERSION |
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62 | #define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__) |
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63 | #endif /* GCC_VERSION */ |
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64 | |||
65 | #if defined (__STDC__) || defined(__cplusplus) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(_WIN32) |
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66 | /* All known AIX compilers implement these things (but don't always |
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67 | define __STDC__). The RISC/OS MIPS compiler defines these things |
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68 | in SVR4 mode, but does not define __STDC__. */ |
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69 | /* eraxxon@alumni.rice.edu: The Compaq C++ compiler, unlike many other |
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70 | C++ compilers, does not define __STDC__, though it acts as if this |
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71 | was so. (Verified versions: 5.7, 6.2, 6.3, 6.5) */ |
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72 | |||
73 | #define PTR void * |
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74 | |||
75 | #undef const |
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76 | #undef volatile |
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77 | #undef signed |
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78 | |||
79 | /* inline requires special treatment; it's in C99, and GCC >=2.7 supports |
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80 | it too, but it's not in C89. */ |
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81 | #undef inline |
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82 | #if __STDC_VERSION__ >= 199901L || defined(__cplusplus) || (defined(__SUNPRO_C) && defined(__C99FEATURES__)) |
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83 | /* it's a keyword */ |
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84 | #else |
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85 | # if GCC_VERSION >= 2007 |
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86 | # define inline __inline__ /* __inline__ prevents -pedantic warnings */ |
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87 | # else |
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88 | # define inline /* nothing */ |
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89 | # endif |
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90 | #endif |
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91 | |||
92 | #else /* Not ANSI C. */ |
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93 | |||
94 | #define PTR char * |
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95 | |||
96 | /* some systems define these in header files for non-ansi mode */ |
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97 | #undef const |
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98 | #undef volatile |
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99 | #undef signed |
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100 | #undef inline |
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101 | #define const |
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102 | #define volatile |
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103 | #define signed |
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104 | #define inline |
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105 | |||
106 | #endif /* ANSI C. */ |
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107 | |||
108 | /* Define macros for some gcc attributes. This permits us to use the |
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109 | macros freely, and know that they will come into play for the |
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110 | version of gcc in which they are supported. */ |
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111 | |||
112 | #if (GCC_VERSION < 2007) |
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113 | # define __attribute__(x) |
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114 | #endif |
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115 | |||
116 | /* Attribute __malloc__ on functions was valid as of gcc 2.96. */ |
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117 | #ifndef ATTRIBUTE_MALLOC |
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118 | # if (GCC_VERSION >= 2096) |
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119 | # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__)) |
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120 | # else |
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121 | # define ATTRIBUTE_MALLOC |
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122 | # endif /* GNUC >= 2.96 */ |
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123 | #endif /* ATTRIBUTE_MALLOC */ |
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124 | |||
125 | /* Attributes on labels were valid as of gcc 2.93 and g++ 4.5. For |
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126 | g++ an attribute on a label must be followed by a semicolon. */ |
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127 | #ifndef ATTRIBUTE_UNUSED_LABEL |
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128 | # ifndef __cplusplus |
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129 | # if GCC_VERSION >= 2093 |
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130 | # define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED |
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131 | # else |
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132 | # define ATTRIBUTE_UNUSED_LABEL |
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133 | # endif |
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134 | # else |
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135 | # if GCC_VERSION >= 4005 |
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136 | # define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED ; |
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137 | # else |
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138 | # define ATTRIBUTE_UNUSED_LABEL |
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139 | # endif |
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140 | # endif |
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141 | #endif |
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142 | |||
143 | /* Similarly to ARG_UNUSED below. Prior to GCC 3.4, the C++ frontend |
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144 | couldn't parse attributes placed after the identifier name, and now |
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145 | the entire compiler is built with C++. */ |
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146 | #ifndef ATTRIBUTE_UNUSED |
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147 | #if GCC_VERSION >= 3004 |
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148 | # define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) |
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149 | #else |
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150 | #define ATTRIBUTE_UNUSED |
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151 | #endif |
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152 | #endif /* ATTRIBUTE_UNUSED */ |
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153 | |||
154 | /* Before GCC 3.4, the C++ frontend couldn't parse attributes placed after the |
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155 | identifier name. */ |
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156 | #if ! defined(__cplusplus) || (GCC_VERSION >= 3004) |
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157 | # define ARG_UNUSED(NAME) NAME ATTRIBUTE_UNUSED |
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158 | #else /* !__cplusplus || GNUC >= 3.4 */ |
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159 | # define ARG_UNUSED(NAME) NAME |
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160 | #endif /* !__cplusplus || GNUC >= 3.4 */ |
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161 | |||
162 | #ifndef ATTRIBUTE_NORETURN |
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163 | #define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__)) |
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164 | #endif /* ATTRIBUTE_NORETURN */ |
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165 | |||
166 | /* Attribute `nonnull' was valid as of gcc 3.3. */ |
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167 | #ifndef ATTRIBUTE_NONNULL |
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168 | # if (GCC_VERSION >= 3003) |
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169 | # define ATTRIBUTE_NONNULL(m) __attribute__ ((__nonnull__ (m))) |
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170 | # else |
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171 | # define ATTRIBUTE_NONNULL(m) |
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172 | # endif /* GNUC >= 3.3 */ |
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173 | #endif /* ATTRIBUTE_NONNULL */ |
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174 | |||
6324 | serge | 175 | /* Attribute `returns_nonnull' was valid as of gcc 4.9. */ |
176 | #ifndef ATTRIBUTE_RETURNS_NONNULL |
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177 | # if (GCC_VERSION >= 4009) |
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178 | # define ATTRIBUTE_RETURNS_NONNULL __attribute__ ((__returns_nonnull__)) |
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179 | # else |
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180 | # define ATTRIBUTE_RETURNS_NONNULL |
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181 | # endif /* GNUC >= 4.9 */ |
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182 | #endif /* ATTRIBUTE_RETURNS_NONNULL */ |
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183 | |||
5191 | serge | 184 | /* Attribute `pure' was valid as of gcc 3.0. */ |
185 | #ifndef ATTRIBUTE_PURE |
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186 | # if (GCC_VERSION >= 3000) |
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187 | # define ATTRIBUTE_PURE __attribute__ ((__pure__)) |
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188 | # else |
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189 | # define ATTRIBUTE_PURE |
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190 | # endif /* GNUC >= 3.0 */ |
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191 | #endif /* ATTRIBUTE_PURE */ |
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192 | |||
193 | /* Use ATTRIBUTE_PRINTF when the format specifier must not be NULL. |
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194 | This was the case for the `printf' format attribute by itself |
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195 | before GCC 3.3, but as of 3.3 we need to add the `nonnull' |
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196 | attribute to retain this behavior. */ |
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197 | #ifndef ATTRIBUTE_PRINTF |
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198 | #define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n))) ATTRIBUTE_NONNULL(m) |
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199 | #define ATTRIBUTE_PRINTF_1 ATTRIBUTE_PRINTF(1, 2) |
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200 | #define ATTRIBUTE_PRINTF_2 ATTRIBUTE_PRINTF(2, 3) |
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201 | #define ATTRIBUTE_PRINTF_3 ATTRIBUTE_PRINTF(3, 4) |
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202 | #define ATTRIBUTE_PRINTF_4 ATTRIBUTE_PRINTF(4, 5) |
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203 | #define ATTRIBUTE_PRINTF_5 ATTRIBUTE_PRINTF(5, 6) |
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204 | #endif /* ATTRIBUTE_PRINTF */ |
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205 | |||
206 | /* Use ATTRIBUTE_FPTR_PRINTF when the format attribute is to be set on |
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207 | a function pointer. Format attributes were allowed on function |
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208 | pointers as of gcc 3.1. */ |
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209 | #ifndef ATTRIBUTE_FPTR_PRINTF |
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210 | # if (GCC_VERSION >= 3001) |
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211 | # define ATTRIBUTE_FPTR_PRINTF(m, n) ATTRIBUTE_PRINTF(m, n) |
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212 | # else |
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213 | # define ATTRIBUTE_FPTR_PRINTF(m, n) |
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214 | # endif /* GNUC >= 3.1 */ |
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215 | # define ATTRIBUTE_FPTR_PRINTF_1 ATTRIBUTE_FPTR_PRINTF(1, 2) |
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216 | # define ATTRIBUTE_FPTR_PRINTF_2 ATTRIBUTE_FPTR_PRINTF(2, 3) |
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217 | # define ATTRIBUTE_FPTR_PRINTF_3 ATTRIBUTE_FPTR_PRINTF(3, 4) |
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218 | # define ATTRIBUTE_FPTR_PRINTF_4 ATTRIBUTE_FPTR_PRINTF(4, 5) |
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219 | # define ATTRIBUTE_FPTR_PRINTF_5 ATTRIBUTE_FPTR_PRINTF(5, 6) |
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220 | #endif /* ATTRIBUTE_FPTR_PRINTF */ |
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221 | |||
222 | /* Use ATTRIBUTE_NULL_PRINTF when the format specifier may be NULL. A |
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223 | NULL format specifier was allowed as of gcc 3.3. */ |
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224 | #ifndef ATTRIBUTE_NULL_PRINTF |
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225 | # if (GCC_VERSION >= 3003) |
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226 | # define ATTRIBUTE_NULL_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n))) |
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227 | # else |
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228 | # define ATTRIBUTE_NULL_PRINTF(m, n) |
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229 | # endif /* GNUC >= 3.3 */ |
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230 | # define ATTRIBUTE_NULL_PRINTF_1 ATTRIBUTE_NULL_PRINTF(1, 2) |
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231 | # define ATTRIBUTE_NULL_PRINTF_2 ATTRIBUTE_NULL_PRINTF(2, 3) |
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232 | # define ATTRIBUTE_NULL_PRINTF_3 ATTRIBUTE_NULL_PRINTF(3, 4) |
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233 | # define ATTRIBUTE_NULL_PRINTF_4 ATTRIBUTE_NULL_PRINTF(4, 5) |
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234 | # define ATTRIBUTE_NULL_PRINTF_5 ATTRIBUTE_NULL_PRINTF(5, 6) |
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235 | #endif /* ATTRIBUTE_NULL_PRINTF */ |
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236 | |||
237 | /* Attribute `sentinel' was valid as of gcc 3.5. */ |
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238 | #ifndef ATTRIBUTE_SENTINEL |
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239 | # if (GCC_VERSION >= 3005) |
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240 | # define ATTRIBUTE_SENTINEL __attribute__ ((__sentinel__)) |
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241 | # else |
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242 | # define ATTRIBUTE_SENTINEL |
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243 | # endif /* GNUC >= 3.5 */ |
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244 | #endif /* ATTRIBUTE_SENTINEL */ |
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245 | |||
246 | |||
247 | #ifndef ATTRIBUTE_ALIGNED_ALIGNOF |
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248 | # if (GCC_VERSION >= 3000) |
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249 | # define ATTRIBUTE_ALIGNED_ALIGNOF(m) __attribute__ ((__aligned__ (__alignof__ (m)))) |
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250 | # else |
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251 | # define ATTRIBUTE_ALIGNED_ALIGNOF(m) |
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252 | # endif /* GNUC >= 3.0 */ |
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253 | #endif /* ATTRIBUTE_ALIGNED_ALIGNOF */ |
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254 | |||
255 | /* Useful for structures whose layout must much some binary specification |
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256 | regardless of the alignment and padding qualities of the compiler. */ |
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257 | #ifndef ATTRIBUTE_PACKED |
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258 | # define ATTRIBUTE_PACKED __attribute__ ((packed)) |
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259 | #endif |
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260 | |||
261 | /* Attribute `hot' and `cold' was valid as of gcc 4.3. */ |
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262 | #ifndef ATTRIBUTE_COLD |
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263 | # if (GCC_VERSION >= 4003) |
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264 | # define ATTRIBUTE_COLD __attribute__ ((__cold__)) |
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265 | # else |
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266 | # define ATTRIBUTE_COLD |
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267 | # endif /* GNUC >= 4.3 */ |
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268 | #endif /* ATTRIBUTE_COLD */ |
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269 | #ifndef ATTRIBUTE_HOT |
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270 | # if (GCC_VERSION >= 4003) |
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271 | # define ATTRIBUTE_HOT __attribute__ ((__hot__)) |
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272 | # else |
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273 | # define ATTRIBUTE_HOT |
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274 | # endif /* GNUC >= 4.3 */ |
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275 | #endif /* ATTRIBUTE_HOT */ |
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276 | |||
6324 | serge | 277 | /* Attribute 'no_sanitize_undefined' was valid as of gcc 4.9. */ |
278 | #ifndef ATTRIBUTE_NO_SANITIZE_UNDEFINED |
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279 | # if (GCC_VERSION >= 4009) |
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280 | # define ATTRIBUTE_NO_SANITIZE_UNDEFINED __attribute__ ((no_sanitize_undefined)) |
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281 | # else |
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282 | # define ATTRIBUTE_NO_SANITIZE_UNDEFINED |
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283 | # endif /* GNUC >= 4.9 */ |
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284 | #endif /* ATTRIBUTE_NO_SANITIZE_UNDEFINED */ |
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285 | |||
5191 | serge | 286 | /* We use __extension__ in some places to suppress -pedantic warnings |
287 | about GCC extensions. This feature didn't work properly before |
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288 | gcc 2.8. */ |
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289 | #if GCC_VERSION < 2008 |
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290 | #define __extension__ |
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291 | #endif |
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292 | |||
293 | /* This is used to declare a const variable which should be visible |
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294 | outside of the current compilation unit. Use it as |
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295 | EXPORTED_CONST int i = 1; |
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296 | This is because the semantics of const are different in C and C++. |
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297 | "extern const" is permitted in C but it looks strange, and gcc |
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298 | warns about it when -Wc++-compat is not used. */ |
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299 | #ifdef __cplusplus |
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300 | #define EXPORTED_CONST extern const |
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301 | #else |
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302 | #define EXPORTED_CONST const |
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303 | #endif |
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304 | |||
305 | /* Be conservative and only use enum bitfields with C++ or GCC. |
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306 | FIXME: provide a complete autoconf test for buggy enum bitfields. */ |
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307 | |||
308 | #ifdef __cplusplus |
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309 | #define ENUM_BITFIELD(TYPE) enum TYPE |
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310 | #elif (GCC_VERSION > 2000) |
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311 | #define ENUM_BITFIELD(TYPE) __extension__ enum TYPE |
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312 | #else |
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313 | #define ENUM_BITFIELD(TYPE) unsigned int |
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314 | #endif |
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315 | |||
6324 | serge | 316 | /* This is used to mark a class or virtual function as final. */ |
317 | #if __cplusplus >= 201103L |
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318 | #define GCC_FINAL final |
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319 | #elif GCC_VERSION >= 4007 |
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320 | #define GCC_FINAL __final |
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321 | #else |
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322 | #define GCC_FINAL |
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323 | #endif |
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324 | |||
5191 | serge | 325 | #ifdef __cplusplus |
326 | } |
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327 | #endif |
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328 | |||
329 | #endif /* ansidecl.h */>> |