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4680 | right-hear | 1 | /* ANSI and traditional C compatability macros |
2 | Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000 |
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3 | Free Software Foundation, Inc. |
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4 | This file is part of the GNU C Library. |
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5 | |||
6 | This program is free software; you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation; either version 2 of the License, or |
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9 | (at your option) any later version. |
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10 | |||
11 | This program is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | GNU General Public License for more details. |
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15 | |||
16 | You should have received a copy of the GNU General Public License |
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17 | along with this program; if not, write to the Free Software |
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18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
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19 | |||
20 | /* ANSI and traditional C compatibility macros |
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21 | |||
22 | ANSI C is assumed if __STDC__ is #defined. |
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23 | |||
24 | Macro ANSI C definition Traditional C definition |
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25 | ----- ---- - ---------- ----------- - ---------- |
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26 | PTR `void *' `char *' |
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27 | LONG_DOUBLE `long double' `double' |
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28 | VOLATILE `volatile' `' |
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29 | SIGNED `signed' `' |
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30 | PTRCONST `void *const' `char *' |
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31 | ANSI_PROTOTYPES 1 not defined |
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32 | |||
33 | CONST is also defined, but is obsolete. Just use const. |
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34 | |||
35 | obsolete -- DEFUN (name, arglist, args) |
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36 | |||
37 | Defines function NAME. |
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38 | |||
39 | ARGLIST lists the arguments, separated by commas and enclosed in |
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40 | parentheses. ARGLIST becomes the argument list in traditional C. |
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41 | |||
42 | ARGS list the arguments with their types. It becomes a prototype in |
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43 | ANSI C, and the type declarations in traditional C. Arguments should |
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44 | be separated with `AND'. For functions with a variable number of |
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45 | arguments, the last thing listed should be `DOTS'. |
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46 | |||
47 | obsolete -- DEFUN_VOID (name) |
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48 | |||
49 | Defines a function NAME, which takes no arguments. |
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50 | |||
51 | obsolete -- EXFUN (name, (prototype)) -- obsolete. |
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52 | |||
53 | Replaced by PARAMS. Do not use; will disappear someday soon. |
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54 | Was used in external function declarations. |
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55 | In ANSI C it is `NAME PROTOTYPE' (so PROTOTYPE should be enclosed in |
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56 | parentheses). In traditional C it is `NAME()'. |
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57 | For a function that takes no arguments, PROTOTYPE should be `(void)'. |
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58 | |||
59 | obsolete -- PROTO (type, name, (prototype) -- obsolete. |
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60 | |||
61 | This one has also been replaced by PARAMS. Do not use. |
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62 | |||
63 | PARAMS ((args)) |
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64 | |||
65 | We could use the EXFUN macro to handle prototype declarations, but |
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66 | the name is misleading and the result is ugly. So we just define a |
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67 | simple macro to handle the parameter lists, as in: |
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68 | |||
69 | static int foo PARAMS ((int, char)); |
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70 | |||
71 | This produces: `static int foo();' or `static int foo (int, char);' |
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72 | |||
73 | EXFUN would have done it like this: |
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74 | |||
75 | static int EXFUN (foo, (int, char)); |
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76 | |||
77 | but the function is not external...and it's hard to visually parse |
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78 | the function name out of the mess. EXFUN should be considered |
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79 | obsolete; new code should be written to use PARAMS. |
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80 | |||
81 | DOTS is also obsolete. |
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82 | |||
83 | Examples: |
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84 | |||
85 | extern int printf PARAMS ((const char *format, ...)); |
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86 | */ |
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87 | |||
88 | #ifndef _ANSIDECL_H |
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89 | |||
90 | #define _ANSIDECL_H 1 |
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91 | |||
92 | |||
93 | /* Every source file includes this file, |
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94 | so they will all get the switch for lint. */ |
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95 | /* LINTLIBRARY */ |
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96 | |||
97 | |||
98 | #if defined (__STDC__) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(_WIN32) |
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99 | /* All known AIX compilers implement these things (but don't always |
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100 | define __STDC__). The RISC/OS MIPS compiler defines these things |
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101 | in SVR4 mode, but does not define __STDC__. */ |
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102 | |||
103 | #define PTR void * |
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104 | #define PTRCONST void *CONST |
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105 | #define LONG_DOUBLE long double |
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106 | |||
107 | #ifndef IN_GCC |
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108 | #define AND , |
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109 | #define NOARGS void |
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110 | #define VOLATILE volatile |
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111 | #define SIGNED signed |
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112 | #endif /* ! IN_GCC */ |
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113 | |||
114 | #define PARAMS(paramlist) paramlist |
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115 | #define ANSI_PROTOTYPES 1 |
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116 | |||
117 | #define VPARAMS(ARGS) ARGS |
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118 | #define VA_START(va_list,var) va_start(va_list,var) |
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119 | |||
120 | /* These are obsolete. Do not use. */ |
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121 | #ifndef IN_GCC |
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122 | #define CONST const |
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123 | #define DOTS , ... |
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124 | #define PROTO(type, name, arglist) type name arglist |
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125 | #define EXFUN(name, proto) name proto |
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126 | #define DEFUN(name, arglist, args) name(args) |
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127 | #define DEFUN_VOID(name) name(void) |
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128 | #endif /* ! IN_GCC */ |
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129 | |||
130 | #else /* Not ANSI C. */ |
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131 | |||
132 | #define PTR char * |
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133 | #define PTRCONST PTR |
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134 | #define LONG_DOUBLE double |
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135 | |||
136 | #ifndef IN_GCC |
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137 | #define AND ; |
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138 | #define NOARGS |
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139 | #define VOLATILE |
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140 | #define SIGNED |
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141 | #endif /* !IN_GCC */ |
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142 | |||
143 | #ifndef const /* some systems define it in header files for non-ansi mode */ |
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144 | #define const |
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145 | #endif |
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146 | |||
147 | #define PARAMS(paramlist) () |
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148 | |||
149 | #define VPARAMS(ARGS) (va_alist) va_dcl |
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150 | #define VA_START(va_list,var) va_start(va_list) |
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151 | |||
152 | /* These are obsolete. Do not use. */ |
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153 | #ifndef IN_GCC |
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154 | #define CONST |
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155 | #define DOTS |
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156 | #define PROTO(type, name, arglist) type name () |
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157 | #define EXFUN(name, proto) name() |
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158 | #define DEFUN(name, arglist, args) name arglist args; |
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159 | #define DEFUN_VOID(name) name() |
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160 | #endif /* ! IN_GCC */ |
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161 | |||
162 | #endif /* ANSI C. */ |
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163 | |||
164 | /* Using MACRO(x,y) in cpp #if conditionals does not work with some |
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165 | older preprocessors. Thus we can't define something like this: |
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166 | |||
167 | #define HAVE_GCC_VERSION(MAJOR, MINOR) \ |
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168 | (__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR))) |
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169 | |||
170 | and then test "#if HAVE_GCC_VERSION(2,7)". |
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171 | |||
172 | So instead we use the macro below and test it against specific values. */ |
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173 | |||
174 | /* This macro simplifies testing whether we are using gcc, and if it |
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175 | is of a particular minimum version. (Both major & minor numbers are |
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176 | significant.) This macro will evaluate to 0 if we are not using |
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177 | gcc at all. */ |
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178 | #ifndef GCC_VERSION |
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179 | #define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__) |
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180 | #endif /* GCC_VERSION */ |
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181 | |||
182 | /* Define macros for some gcc attributes. This permits us to use the |
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183 | macros freely, and know that they will come into play for the |
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184 | version of gcc in which they are supported. */ |
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185 | |||
186 | #if (GCC_VERSION < 2007) |
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187 | # define __attribute__(x) |
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188 | #endif |
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189 | |||
190 | /* Attribute __malloc__ on functions was valid as of gcc 2.96. */ |
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191 | #ifndef ATTRIBUTE_MALLOC |
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192 | # if (GCC_VERSION >= 2096) |
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193 | # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__)) |
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194 | # else |
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195 | # define ATTRIBUTE_MALLOC |
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196 | # endif /* GNUC >= 2.96 */ |
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197 | #endif /* ATTRIBUTE_MALLOC */ |
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198 | |||
199 | /* Attributes on labels were valid as of gcc 2.93. */ |
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200 | #ifndef ATTRIBUTE_UNUSED_LABEL |
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201 | # if (GCC_VERSION >= 2093) |
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202 | # define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED |
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203 | # else |
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204 | # define ATTRIBUTE_UNUSED_LABEL |
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205 | # endif /* GNUC >= 2.93 */ |
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206 | #endif /* ATTRIBUTE_UNUSED_LABEL */ |
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207 | |||
208 | #ifndef ATTRIBUTE_UNUSED |
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209 | #define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) |
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210 | #endif /* ATTRIBUTE_UNUSED */ |
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211 | |||
212 | #ifndef ATTRIBUTE_NORETURN |
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213 | #define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__)) |
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214 | #endif /* ATTRIBUTE_NORETURN */ |
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215 | |||
216 | #ifndef ATTRIBUTE_PRINTF |
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217 | #define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n))) |
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218 | #define ATTRIBUTE_PRINTF_1 ATTRIBUTE_PRINTF(1, 2) |
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219 | #define ATTRIBUTE_PRINTF_2 ATTRIBUTE_PRINTF(2, 3) |
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220 | #define ATTRIBUTE_PRINTF_3 ATTRIBUTE_PRINTF(3, 4) |
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221 | #define ATTRIBUTE_PRINTF_4 ATTRIBUTE_PRINTF(4, 5) |
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222 | #define ATTRIBUTE_PRINTF_5 ATTRIBUTE_PRINTF(5, 6) |
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223 | #endif /* ATTRIBUTE_PRINTF */ |
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224 | |||
225 | /* We use __extension__ in some places to suppress -pedantic warnings |
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226 | about GCC extensions. This feature didn't work properly before |
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227 | gcc 2.8. */ |
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228 | #if GCC_VERSION < 2008 |
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229 | #define __extension__ |
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230 | #endif |
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231 | |||
232 | /* Bootstrap support: Autoconf will possibly define the `inline' or |
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233 | `const' keywords as macros, however this is only valid for the |
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234 | stage1 compiler. If we detect a modern version of gcc, |
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235 | unconditionally reset the values. This makes sure the right thing |
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236 | happens in stage2 and later. We need to do this very early; |
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237 | i.e. before any header files that might use these keywords. |
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238 | Otherwise conflicts might occur. */ |
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239 | |||
240 | #if (GCC_VERSION >= 2007) |
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241 | # ifdef __STDC__ |
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242 | # undef const |
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243 | # endif |
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244 | # undef inline |
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245 | # define inline __inline__ /* __inline__ prevents -pedantic warnings */ |
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246 | # ifndef HAVE_LONG_DOUBLE |
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247 | # define HAVE_LONG_DOUBLE 1 |
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248 | # endif |
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249 | #endif /* GCC >= 2.7 */ |
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250 | |||
251 | #endif /* ansidecl.h */>> |