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1 /* Compiler-specific definitions for XEmacs.
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2 Copyright (C) 1998-1999, 2003 Free Software Foundation, Inc.
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3 Copyright (C) 1994 Richard Mlynarik.
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: not in FSF. */
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23
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24 /* Authorship:
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25
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26 NOT_REACHED, DOESNT_RETURN, PRINTF_ARGS by Richard Mlynarik, c. 1994.
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27 RETURN_SANS_WARNING by Martin buchholz, 1998 or 1999.
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28 Many changes and improvements by Jerry James, 2003.
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29 Split out of lisp.h, reorganized, and modernized.
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30 {BEGIN,END}_C_DECLS, NEED_GCC, GCC_VERSION
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31 ATTRIBUTE_MALLOC, ATTRIBUTE_CONST, ATTRIBUTE_PURE, UNUSED
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32 */
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33
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34 #ifndef INCLUDED_compiler_h
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35 #define INCLUDED_compiler_h
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36
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37 /* Define min() and max(). (Some compilers put them in strange places that
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38 won't be referenced by include files used by XEmacs, such as 'macros.h'
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39 under Solaris.) */
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40
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41 #ifndef min
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42 # define min(a,b) (((a) <= (b)) ? (a) : (b))
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43 #endif
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44 #ifndef max
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45 # define max(a,b) (((a) > (b)) ? (a) : (b))
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46 #endif
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47
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48 /* Regular C complains about possible clobbering of local vars NOT declared
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49 as volatile if there's a longjmp() in a function. C++ complains if such
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50 vars ARE volatile; or more correctly, sans volatile no problem even when
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51 you longjmp, avec volatile you get unfixable compile errors like
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52
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53 /src/xemacs/lilfix/src/process-unix.c: In function `void
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54 unix_send_process(Lisp_Object, lstream*)':
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55 /src/xemacs/lilfix/src/process-unix.c:1577: no matching function for call to `
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56 Lisp_Object::Lisp_Object(volatile Lisp_Object&)'
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57 /src/xemacs/lilfix/src/lisp-union.h:32: candidates are:
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58 Lisp_Object::Lisp_Object(const Lisp_Object&)
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59 */
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60
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61 #ifdef __cplusplus
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62 # define VOLATILE_IF_NOT_CPP
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63 #else
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64 # define VOLATILE_IF_NOT_CPP volatile
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65 #endif
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66
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67 /* Avoid indentation problems when XEmacs sees the curly braces */
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68 #ifndef BEGIN_C_DECLS
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69 # ifdef __cplusplus
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70 # define BEGIN_C_DECLS extern "C" {
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71 # define END_C_DECLS }
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72 # else
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73 # define BEGIN_C_DECLS
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74 # define END_C_DECLS
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75 # endif
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76 #endif
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77
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78 /* Guard against older gccs that did not define all of these symbols */
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79 #ifdef __GNUC__
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80 # ifndef __GNUC_MINOR__
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81 # define __GNUC_MINOR__ 0
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82 # endif
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83 # ifndef __GNUC_PATCHLEVEL__
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84 # define __GNUC_PATCHLEVEL__ 0
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85 # endif
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86 #endif /* __GNUC__ */
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87
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88 /* Simplify testing for specific GCC versions. For non-GNU compilers,
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89 GCC_VERSION evaluates to zero. */
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90 #ifndef NEED_GCC
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91 # define NEED_GCC(major,minor,patch) (major * 1000000 + minor * 1000 + patch)
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92 #endif /* NEED_GCC */
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93 #ifndef GCC_VERSION
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94 # ifdef __GNUC__
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95 # define GCC_VERSION NEED_GCC (__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
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96 # else
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97 # define GCC_VERSION 0
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98 # endif /* __GNUC__ */
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99 #endif /* GCC_VERSION */
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100
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101 /* GCC < 2.6.0 could only declare one attribute per function. In that case,
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102 we define DOESNT_RETURN in preference to PRINTF_ARGS, which is only used
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103 for checking args against the string spec. */
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104 #ifndef PRINTF_ARGS
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105 # if (GCC_VERSION >= NEED_GCC (2, 6, 0))
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106 # define PRINTF_ARGS(string_index,first_to_check) \
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107 __attribute__ ((format (printf, string_index, first_to_check)))
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108 # else
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109 # define PRINTF_ARGS(string_index,first_to_check)
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110 # endif /* GNUC */
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111 #endif
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112
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113 #ifndef DOESNT_RETURN_TYPE
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114 # if (GCC_VERSION > NEED_GCC (0, 0, 0))
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115 # if (GCC_VERSION >= NEED_GCC (2, 5, 0))
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116 # ifndef __INTEL_COMPILER
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117 # define RETURN_NOT_REACHED(value) DO_NOTHING
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118 # endif
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119 # define DOESNT_RETURN_TYPE(rettype) rettype
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120 # define DECLARE_DOESNT_RETURN_TYPE(rettype,decl) rettype decl \
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121 __attribute__ ((noreturn))
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122 # else /* GCC_VERSION < NEED_GCC (2, 5, 0) */
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123 # define DOESNT_RETURN_TYPE(rettype) rettype volatile
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124 # define DECLARE_DOESNT_RETURN_TYPE(rettype,decl) rettype volatile decl
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125 # endif /* GCC_VERSION >= NEED_GCC (2, 5, 0) */
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126 # else /* not gcc */
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127 # define DOESNT_RETURN_TYPE(rettype) rettype
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128 # define DECLARE_DOESNT_RETURN_TYPE(rettype,decl) rettype decl
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129 # endif /* GCC_VERSION > NEED_GCC (0, 0, 0) */
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130 #endif /* DOESNT_RETURN_TYPE */
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131 #ifndef DOESNT_RETURN
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132 # define DOESNT_RETURN DOESNT_RETURN_TYPE (void)
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133 # define DECLARE_DOESNT_RETURN(decl) DECLARE_DOESNT_RETURN_TYPE (void, decl)
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134 #endif /* DOESNT_RETURN */
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135
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136 /* Another try to fix SunPro C compiler warnings */
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137 /* "end-of-loop code not reached" */
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138 /* "statement not reached */
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139 #if defined __SUNPRO_C || defined __USLC__
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140 # define RETURN_SANS_WARNINGS if (1) return
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141 # define RETURN_NOT_REACHED(value) DO_NOTHING
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142 #endif
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143
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144 /* More ways to shut up compiler. This works in Fcommand_loop_1(),
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145 where there's an infinite loop in a function returning a Lisp object.
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146 */
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147 #if defined (_MSC_VER) || defined (__SUNPRO_C) || defined (__SUNPRO_CC) || \
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148 (defined (DEC_ALPHA) && defined (OSF1))
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149 # define DO_NOTHING_DISABLING_NO_RETURN_WARNINGS if (0) return Qnil
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150 #else
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151 # define DO_NOTHING_DISABLING_NO_RETURN_WARNINGS DO_NOTHING
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152 #endif
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153
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154 #ifndef RETURN_NOT_REACHED
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155 # define RETURN_NOT_REACHED(value) return (value)
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156 #endif
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157
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158 #ifndef RETURN_SANS_WARNINGS
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159 # define RETURN_SANS_WARNINGS return
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160 #endif
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161
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162 #ifndef DO_NOTHING
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163 # define DO_NOTHING do {} while (0)
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164 #endif
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165
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166 #ifndef DECLARE_NOTHING
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167 # define DECLARE_NOTHING struct nosuchstruct
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168 #endif
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169
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170 #ifndef ATTRIBUTE_MALLOC
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171 # if (GCC_VERSION >= NEED_GCC (2, 96, 0))
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172 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
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173 # else
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174 # define ATTRIBUTE_MALLOC
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175 # endif /* GCC_VERSION >= NEED_GCC (2, 96, 0) */
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176 #endif /* ATTRIBUTE_MALLOC */
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177
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178 #ifndef ATTRIBUTE_PURE
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179 # if (GCC_VERSION >= NEED_GCC (2, 96, 0))
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180 # define ATTRIBUTE_PURE __attribute__ ((pure))
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181 # else
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182 # define ATTRIBUTE_PURE
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183 # endif /* GCC_VERSION >= NEED_GCC (2, 96, 0) */
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184 #endif /* ATTRIBUTE_PURE */
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185
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186 #ifndef ATTRIBUTE_CONST
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187 # if (GCC_VERSION >= NEED_GCC (2, 5, 0))
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188 # define ATTRIBUTE_CONST __attribute__ ((const))
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189 # define CONST_FUNC
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190 # else
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191 # define ATTRIBUTE_CONST
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192 # define CONST_FUNC const
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193 # endif /* GCC_VERSION >= NEED_GCC (2, 5, 0) */
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194 #endif /* ATTRIBUTE_CONST */
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195
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196 /* Unused declarations; g++ and icc do not support this. */
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197 #ifndef UNUSED_ARG
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198 # define UNUSED_ARG(decl) unused_##decl
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199 #endif
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200 #ifndef UNUSED
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201 # if defined(__GNUC__) && !defined(__cplusplus) && !defined(__INTEL_COMPILER)
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202 # define ATTRIBUTE_UNUSED __attribute__ ((unused))
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203 # else
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204 # define ATTRIBUTE_UNUSED
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205 # endif
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206 # define UNUSED(decl) UNUSED_ARG (decl) ATTRIBUTE_UNUSED
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207 #endif /* UNUSED */
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208
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209 #ifdef DEBUG_XEMACS
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210 # define REGISTER
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211 # define register
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212 #else
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213 # define REGISTER register
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214 #endif
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215
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216 #if defined(HAVE_MS_WINDOWS) && defined(HAVE_SHLIB)
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217 # ifdef EMACS_MODULE
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218 # define MODULE_API __declspec(dllimport)
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219 # else
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220 # define MODULE_API __declspec(dllexport)
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221 # endif
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222 #else
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223 # define MODULE_API
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224 #endif
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225
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226 #endif /* INCLUDED_compiler_h */
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