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1 /* ANSI and traditional C compatability macros
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2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001
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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
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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
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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
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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
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20 /* ANSI and traditional C compatibility macros
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21
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22 ANSI C is assumed if __STDC__ is #defined.
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23
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24 Macro ANSI C definition Traditional C definition
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25 ----- ---- - ---------- ----------- - ----------
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26 ANSI_PROTOTYPES 1 not defined
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27 PTR `void *' `char *'
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28 PTRCONST `void *const' `char *'
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29 LONG_DOUBLE `long double' `double'
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30 const not defined `'
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31 volatile not defined `'
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32 signed not defined `'
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33 VA_START(ap, var) va_start(ap, var) va_start(ap)
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34
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35 Note that it is safe to write "void foo();" indicating a function
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36 with no return value, in all K+R compilers we have been able to test.
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37
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38 For declaring functions with prototypes, we also provide these:
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39
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40 PARAMS ((prototype))
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41 -- for functions which take a fixed number of arguments. Use this
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42 when declaring the function. When defining the function, write a
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43 K+R style argument list. For example:
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44
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45 char *strcpy PARAMS ((char *dest, char *source));
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46 ...
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47 char *
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48 strcpy (dest, source)
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49 char *dest;
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50 char *source;
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51 { ... }
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52
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53
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54 VPARAMS ((prototype, ...))
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55 -- for functions which take a variable number of arguments. Use
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56 PARAMS to declare the function, VPARAMS to define it. For example:
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57
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58 int printf PARAMS ((const char *format, ...));
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59 ...
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60 int
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61 printf VPARAMS ((const char *format, ...))
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62 {
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63 ...
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64 }
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65
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66 For writing functions which take variable numbers of arguments, we
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67 also provide the VA_OPEN, VA_CLOSE, and VA_FIXEDARG macros. These
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68 hide the differences between K+R <varargs.h> and C89 <stdarg.h> more
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69 thoroughly than the simple VA_START() macro mentioned above.
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70
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71 VA_OPEN and VA_CLOSE are used *instead of* va_start and va_end.
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72 Immediately after VA_OPEN, put a sequence of VA_FIXEDARG calls
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73 corresponding to the list of fixed arguments. Then use va_arg
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74 normally to get the variable arguments, or pass your va_list object
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75 around. You do not declare the va_list yourself; VA_OPEN does it
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76 for you.
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77
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78 Here is a complete example:
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79
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80 int
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81 printf VPARAMS ((const char *format, ...))
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82 {
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83 int result;
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84
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85 VA_OPEN (ap, format);
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86 VA_FIXEDARG (ap, const char *, format);
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87
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88 result = vfprintf (stdout, format, ap);
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89 VA_CLOSE (ap);
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90
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91 return result;
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92 }
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93
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94
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95 You can declare variables either before or after the VA_OPEN,
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96 VA_FIXEDARG sequence. Also, VA_OPEN and VA_CLOSE are the beginning
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97 and end of a block. They must appear at the same nesting level,
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98 and any variables declared after VA_OPEN go out of scope at
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99 VA_CLOSE. Unfortunately, with a K+R compiler, that includes the
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100 argument list. You can have multiple instances of VA_OPEN/VA_CLOSE
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101 pairs in a single function in case you need to traverse the
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102 argument list more than once.
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103
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104 For ease of writing code which uses GCC extensions but needs to be
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105 portable to other compilers, we provide the GCC_VERSION macro that
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106 simplifies testing __GNUC__ and __GNUC_MINOR__ together, and various
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107 wrappers around __attribute__. Also, __extension__ will be #defined
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108 to nothing if it doesn't work. See below.
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109
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110 This header also defines a lot of obsolete macros:
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111 CONST, VOLATILE, SIGNED, PROTO, EXFUN, DEFUN, DEFUN_VOID,
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112 AND, DOTS, NOARGS. Don't use them. */
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113
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114 #ifndef _ANSIDECL_H
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115 #define _ANSIDECL_H 1
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116
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117 /* Every source file includes this file,
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118 so they will all get the switch for lint. */
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119 /* LINTLIBRARY */
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120
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121 /* Using MACRO(x,y) in cpp #if conditionals does not work with some
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122 older preprocessors. Thus we can't define something like this:
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123
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124 #define HAVE_GCC_VERSION(MAJOR, MINOR) \
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125 (__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR)))
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126
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127 and then test "#if HAVE_GCC_VERSION(2,7)".
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128
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129 So instead we use the macro below and test it against specific values. */
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130
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131 /* This macro simplifies testing whether we are using gcc, and if it
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132 is of a particular minimum version. (Both major & minor numbers are
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133 significant.) This macro will evaluate to 0 if we are not using
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134 gcc at all. */
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135 #ifndef GCC_VERSION
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136 #define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
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137 #endif /* GCC_VERSION */
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138
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139 #if defined (__STDC__) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(_WIN32)
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140 /* All known AIX compilers implement these things (but don't always
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141 define __STDC__). The RISC/OS MIPS compiler defines these things
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142 in SVR4 mode, but does not define __STDC__. */
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143
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144 #define ANSI_PROTOTYPES 1
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145 #define PTR void *
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146 #define PTRCONST void *const
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147 #define LONG_DOUBLE long double
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148
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149 #define PARAMS(ARGS) ARGS
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150 #define VPARAMS(ARGS) ARGS
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151 #define VA_START(VA_LIST, VAR) va_start(VA_LIST, VAR)
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152
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153 /* variadic function helper macros */
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154 /* "struct Qdmy" swallows the semicolon after VA_OPEN/VA_FIXEDARG's
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155 use without inhibiting further decls and without declaring an
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156 actual variable. */
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157 #define VA_OPEN(AP, VAR) { va_list AP; va_start(AP, VAR); { struct Qdmy
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158 #define VA_CLOSE(AP) } va_end(AP); }
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159 #define VA_FIXEDARG(AP, T, N) struct Qdmy
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160
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161 #undef const
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162 #undef volatile
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163 #undef signed
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164
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165 /* inline requires special treatment; it's in C99, and GCC >=2.7 supports
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166 it too, but it's not in C89. */
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167 #undef inline
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168 #if __STDC_VERSION__ > 199901L
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169 /* it's a keyword */
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170 #else
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171 # if GCC_VERSION >= 2007
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172 # define inline __inline__ /* __inline__ prevents -pedantic warnings */
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173 # else
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174 # define inline /* nothing */
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175 # endif
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176 #endif
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177
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178 /* These are obsolete. Do not use. */
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179 #ifndef IN_GCC
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180 #define CONST const
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181 #define VOLATILE volatile
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182 #define SIGNED signed
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183
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184 #define PROTO(type, name, arglist) type name arglist
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185 #define EXFUN(name, proto) name proto
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186 #define DEFUN(name, arglist, args) name(args)
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187 #define DEFUN_VOID(name) name(void)
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188 #define AND ,
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189 #define DOTS , ...
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190 #define NOARGS void
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191 #endif /* ! IN_GCC */
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192
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193 #else /* Not ANSI C. */
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194
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195 #undef ANSI_PROTOTYPES
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196 #define PTR char *
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197 #define PTRCONST PTR
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198 #define LONG_DOUBLE double
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199
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200 #define PARAMS(args) ()
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201 #define VPARAMS(args) (va_alist) va_dcl
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202 #define VA_START(va_list, var) va_start(va_list)
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203
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204 #define VA_OPEN(AP, VAR) { va_list AP; va_start(AP); { struct Qdmy
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205 #define VA_CLOSE(AP) } va_end(AP); }
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206 #define VA_FIXEDARG(AP, TYPE, NAME) TYPE NAME = va_arg(AP, TYPE)
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207
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208 /* some systems define these in header files for non-ansi mode */
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209 #undef const
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210 #undef volatile
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211 #undef signed
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212 #undef inline
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213 #define const
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214 #define volatile
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215 #define signed
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216 #define inline
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217
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218 #ifndef IN_GCC
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219 #define CONST
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220 #define VOLATILE
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221 #define SIGNED
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222
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223 #define PROTO(type, name, arglist) type name ()
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224 #define EXFUN(name, proto) name()
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225 #define DEFUN(name, arglist, args) name arglist args;
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226 #define DEFUN_VOID(name) name()
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227 #define AND ;
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228 #define DOTS
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229 #define NOARGS
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230 #endif /* ! IN_GCC */
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231
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232 #endif /* ANSI C. */
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233
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234 /* Define macros for some gcc attributes. This permits us to use the
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235 macros freely, and know that they will come into play for the
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236 version of gcc in which they are supported. */
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237
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238 #if (GCC_VERSION < 2007)
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239 # define __attribute__(x)
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240 #endif
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241
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242 /* Attribute __malloc__ on functions was valid as of gcc 2.96. */
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243 #ifndef ATTRIBUTE_MALLOC
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244 # if (GCC_VERSION >= 2096)
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245 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
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246 # else
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247 # define ATTRIBUTE_MALLOC
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248 # endif /* GNUC >= 2.96 */
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249 #endif /* ATTRIBUTE_MALLOC */
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250
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251 /* Attributes on labels were valid as of gcc 2.93. */
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252 #ifndef ATTRIBUTE_UNUSED_LABEL
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253 # if (GCC_VERSION >= 2093)
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254 # define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED
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255 # else
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256 # define ATTRIBUTE_UNUSED_LABEL
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257 # endif /* GNUC >= 2.93 */
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258 #endif /* ATTRIBUTE_UNUSED_LABEL */
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259
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260 #ifndef ATTRIBUTE_UNUSED
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261 #define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
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262 #endif /* ATTRIBUTE_UNUSED */
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263
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264 #ifndef ATTRIBUTE_NORETURN
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265 #define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
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266 #endif /* ATTRIBUTE_NORETURN */
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267
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268 #ifndef ATTRIBUTE_PRINTF
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269 #define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n)))
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270 #define ATTRIBUTE_PRINTF_1 ATTRIBUTE_PRINTF(1, 2)
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271 #define ATTRIBUTE_PRINTF_2 ATTRIBUTE_PRINTF(2, 3)
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272 #define ATTRIBUTE_PRINTF_3 ATTRIBUTE_PRINTF(3, 4)
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273 #define ATTRIBUTE_PRINTF_4 ATTRIBUTE_PRINTF(4, 5)
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274 #define ATTRIBUTE_PRINTF_5 ATTRIBUTE_PRINTF(5, 6)
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275 #endif /* ATTRIBUTE_PRINTF */
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276
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277 /* We use __extension__ in some places to suppress -pedantic warnings
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278 about GCC extensions. This feature didn't work properly before
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279 gcc 2.8. */
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280 #if GCC_VERSION < 2008
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281 #define __extension__
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282 #endif
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283
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284 /* Bootstrap support: Adjust certain macros defined by Autoconf,
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285 which are only valid for the stage1 compiler. If we detect
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286 a modern version of GCC, we are probably in stage2 or beyond,
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287 so unconditionally reset the values. Note that const, inline,
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288 etc. have been dealt with above. */
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289 #if (GCC_VERSION >= 2007)
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290 # ifndef HAVE_LONG_DOUBLE
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291 # define HAVE_LONG_DOUBLE 1
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292 # endif
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293 #endif /* GCC >= 2.7 */
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294
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295 #endif /* ansidecl.h */
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