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1 dnl Macros to check the presence of generic (non-typed) symbols.
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2 dnl Copyright (c) 2006-2008 Diego Pettenò <flameeyes gmail com>
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3 dnl Copyright (c) 2006-2008 xine project
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4 dnl Copyright (c) 2021 libuv project
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5 dnl
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6 dnl This program is free software; you can redistribute it and/or modify
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7 dnl it under the terms of the GNU General Public License as published by
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8 dnl the Free Software Foundation; either version 3, or (at your option)
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9 dnl any later version.
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10 dnl
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11 dnl This program is distributed in the hope that it will be useful,
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12 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 dnl GNU General Public License for more details.
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15 dnl
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16 dnl You should have received a copy of the GNU General Public License
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17 dnl along with this program; if not, write to the Free Software
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18 dnl Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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19 dnl 02110-1301, USA.
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20 dnl
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21 dnl As a special exception, the copyright owners of the
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22 dnl macro gives unlimited permission to copy, distribute and modify the
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23 dnl configure scripts that are the output of Autoconf when processing the
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24 dnl Macro. You need not follow the terms of the GNU General Public
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25 dnl License when using or distributing such scripts, even though portions
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26 dnl of the text of the Macro appear in them. The GNU General Public
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27 dnl License (GPL) does govern all other use of the material that
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28 dnl constitutes the Autoconf Macro.
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29 dnl
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30 dnl This special exception to the GPL applies to versions of the
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31 dnl Autoconf Macro released by this project. When you make and
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32 dnl distribute a modified version of the Autoconf Macro, you may extend
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33 dnl this special exception to the GPL to apply to your modified version as
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34 dnl well.
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35
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36 dnl Check if the flag is supported by compiler
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37 dnl CC_CHECK_CFLAGS_SILENT([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
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38
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39 AC_DEFUN([CC_CHECK_CFLAGS_SILENT], [
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40 AC_CACHE_VAL(AS_TR_SH([cc_cv_cflags_$1]),
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41 [ac_save_CFLAGS="$CFLAGS"
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42 CFLAGS="$CFLAGS $1"
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43 AC_COMPILE_IFELSE([AC_LANG_SOURCE([int a;])],
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44 [eval "AS_TR_SH([cc_cv_cflags_$1])='yes'"],
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45 [eval "AS_TR_SH([cc_cv_cflags_$1])='no'"])
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46 CFLAGS="$ac_save_CFLAGS"
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47 ])
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48
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49 AS_IF([eval test x$]AS_TR_SH([cc_cv_cflags_$1])[ = xyes],
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50 [$2], [$3])
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51 ])
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52
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53 dnl Check if the flag is supported by compiler (cacheable)
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54 dnl CC_CHECK_CFLAGS([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
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55
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56 AC_DEFUN([CC_CHECK_CFLAGS], [
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57 AC_CACHE_CHECK([if $CC supports $1 flag],
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58 AS_TR_SH([cc_cv_cflags_$1]),
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59 CC_CHECK_CFLAGS_SILENT([$1]) dnl Don't execute actions here!
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60 )
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61
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62 AS_IF([eval test x$]AS_TR_SH([cc_cv_cflags_$1])[ = xyes],
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63 [$2], [$3])
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64 ])
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65
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66 dnl CC_CHECK_CFLAG_APPEND(FLAG, [action-if-found], [action-if-not-found])
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67 dnl Check for CFLAG and appends them to AM_CFLAGS if supported
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68 AC_DEFUN([CC_CHECK_CFLAG_APPEND], [
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69 AC_CACHE_CHECK([if $CC supports $1 flag],
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70 AS_TR_SH([cc_cv_cflags_$1]),
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71 CC_CHECK_CFLAGS_SILENT([$1]) dnl Don't execute actions here!
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72 )
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73
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74 AS_IF([eval test x$]AS_TR_SH([cc_cv_cflags_$1])[ = xyes],
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75 [AM_CFLAGS="$AM_CFLAGS $1"; DEBUG_CFLAGS="$DEBUG_CFLAGS $1"; $2], [$3])
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76
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77 AC_SUBST([AM_CFLAGS])
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78 ])
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79
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80 dnl CC_CHECK_CFLAGS_APPEND([FLAG1 FLAG2], [action-if-found], [action-if-not])
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81 AC_DEFUN([CC_CHECK_CFLAGS_APPEND], [
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82 for flag in $1; do
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83 CC_CHECK_CFLAG_APPEND($flag, [$2], [$3])
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84 done
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85 ])
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86
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87 dnl Check if the flag is supported by linker (cacheable)
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88 dnl CC_CHECK_LDFLAGS([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
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89
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90 AC_DEFUN([CC_CHECK_LDFLAGS], [
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91 AC_CACHE_CHECK([if $CC supports $1 flag],
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92 AS_TR_SH([cc_cv_ldflags_$1]),
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93 [ac_save_LDFLAGS="$LDFLAGS"
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94 LDFLAGS="$LDFLAGS $1"
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95 AC_LANG_PUSH([C])
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96 AC_LINK_IFELSE([AC_LANG_SOURCE([int main() { return 1; }])],
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97 [eval "AS_TR_SH([cc_cv_ldflags_$1])='yes'"],
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98 [eval "AS_TR_SH([cc_cv_ldflags_$1])="])
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99 AC_LANG_POP([C])
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100 LDFLAGS="$ac_save_LDFLAGS"
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101 ])
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102
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103 AS_IF([eval test x$]AS_TR_SH([cc_cv_ldflags_$1])[ = xyes],
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104 [$2], [$3])
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105 ])
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106
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107 dnl Check if flag is supported by both compiler and linker
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108 dnl If so, append it to AM_CFLAGS
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109 dnl CC_CHECK_FLAG_SUPPORTED_APPEND([FLAG])
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110
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111 AC_DEFUN([CC_CHECK_FLAG_SUPPORTED_APPEND], [
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112 CC_CHECK_CFLAGS([$1],
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113 [CC_CHECK_LDFLAGS([$1],
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114 [AM_CFLAGS="$AM_CFLAGS $1";
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115 DEBUG_CFLAGS="$DEBUG_CFLAGS $1";
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116 AC_SUBST([AM_CFLAGS])
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117 ])
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118 ])
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119 ])
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120
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121 dnl define the LDFLAGS_NOUNDEFINED variable with the correct value for
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122 dnl the current linker to avoid undefined references in a shared object.
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123 AC_DEFUN([CC_NOUNDEFINED], [
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124 dnl We check $host for which systems to enable this for.
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125 AC_REQUIRE([AC_CANONICAL_HOST])
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126
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127 case $host in
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128 dnl FreeBSD (et al.) does not complete linking for shared objects when pthreads
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129 dnl are requested, as different implementations are present; to avoid problems
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130 dnl use -Wl,-z,defs only for those platform not behaving this way.
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131 *-freebsd* | *-openbsd*) ;;
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132 *)
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133 dnl First of all check for the --no-undefined variant of GNU ld. This allows
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134 dnl for a much more readable commandline, so that people can understand what
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135 dnl it does without going to look for what the heck -z defs does.
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136 for possible_flags in "-Wl,--no-undefined" "-Wl,-z,defs"; do
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137 CC_CHECK_LDFLAGS([$possible_flags], [LDFLAGS_NOUNDEFINED="$possible_flags"])
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138 break
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139 done
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140 ;;
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141 esac
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142
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143 AC_SUBST([LDFLAGS_NOUNDEFINED])
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144 ])
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145
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146 dnl Check for a -Werror flag or equivalent. -Werror is the GCC
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147 dnl and ICC flag that tells the compiler to treat all the warnings
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148 dnl as fatal. We usually need this option to make sure that some
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149 dnl constructs (like attributes) are not simply ignored.
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150 dnl
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151 dnl Other compilers don't support -Werror per se, but they support
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152 dnl an equivalent flag:
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153 dnl - Sun Studio compiler supports -errwarn=%all
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154 AC_DEFUN([CC_CHECK_WERROR], [
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155 AC_CACHE_CHECK(
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156 [for $CC way to treat warnings as errors],
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157 [cc_cv_werror],
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158 [CC_CHECK_CFLAGS_SILENT([-Werror], [cc_cv_werror=-Werror],
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159 [CC_CHECK_CFLAGS_SILENT([-errwarn=%all], [cc_cv_werror=-errwarn=%all])])
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160 ])
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161 ])
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162
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163 AC_DEFUN([CC_CHECK_ATTRIBUTE], [
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164 AC_REQUIRE([CC_CHECK_WERROR])
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165 AC_CACHE_CHECK([if $CC supports __attribute__(( ifelse([$2], , [$1], [$2]) ))],
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166 AS_TR_SH([cc_cv_attribute_$1]),
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167 [ac_save_CFLAGS="$CFLAGS"
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168 CFLAGS="$CFLAGS $cc_cv_werror"
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169 AC_LANG_PUSH([C])
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170 AC_COMPILE_IFELSE([AC_LANG_SOURCE([$3])],
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171 [eval "AS_TR_SH([cc_cv_attribute_$1])='yes'"],
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172 [eval "AS_TR_SH([cc_cv_attribute_$1])='no'"])
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173 AC_LANG_POP([C])
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174 CFLAGS="$ac_save_CFLAGS"
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175 ])
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176
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177 AS_IF([eval test x$]AS_TR_SH([cc_cv_attribute_$1])[ = xyes],
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178 [AC_DEFINE(
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179 AS_TR_CPP([SUPPORT_ATTRIBUTE_$1]), 1,
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180 [Define this if the compiler supports __attribute__(( ifelse([$2], , [$1], [$2]) ))]
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181 )
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182 $4],
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183 [$5])
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184 ])
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185
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186 AC_DEFUN([CC_ATTRIBUTE_CONSTRUCTOR], [
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187 CC_CHECK_ATTRIBUTE(
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188 [constructor],,
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189 [void __attribute__((constructor)) ctor() { int a; }],
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190 [$1], [$2])
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191 ])
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192
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193 AC_DEFUN([CC_ATTRIBUTE_FORMAT], [
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194 CC_CHECK_ATTRIBUTE(
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195 [format], [format(printf, n, n)],
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196 [void __attribute__((format(printf, 1, 2))) printflike(const char *fmt, ...) { fmt = (void *)0; }],
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197 [$1], [$2])
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198 ])
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199
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200 AC_DEFUN([CC_ATTRIBUTE_FORMAT_ARG], [
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201 CC_CHECK_ATTRIBUTE(
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202 [format_arg], [format_arg(printf)],
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203 [char *__attribute__((format_arg(1))) gettextlike(const char *fmt) { fmt = (void *)0; }],
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204 [$1], [$2])
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205 ])
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206
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207 AC_DEFUN([CC_ATTRIBUTE_VISIBILITY], [
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208 CC_CHECK_ATTRIBUTE(
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209 [visibility_$1], [visibility("$1")],
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210 [void __attribute__((visibility("$1"))) $1_function() { }],
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211 [$2], [$3])
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212 ])
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213
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214 AC_DEFUN([CC_ATTRIBUTE_NONNULL], [
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215 CC_CHECK_ATTRIBUTE(
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216 [nonnull], [nonnull()],
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217 [void __attribute__((nonnull())) some_function(void *foo, void *bar) { foo = (void*)0; bar = (void*)0; }],
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218 [$1], [$2])
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219 ])
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220
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221 AC_DEFUN([CC_ATTRIBUTE_UNUSED], [
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222 CC_CHECK_ATTRIBUTE(
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223 [unused], ,
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224 [void some_function(void *foo, __attribute__((unused)) void *bar);],
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225 [$1], [$2])
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226 ])
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227
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228 AC_DEFUN([CC_ATTRIBUTE_SENTINEL], [
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229 CC_CHECK_ATTRIBUTE(
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230 [sentinel], ,
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231 [void some_function(void *foo, ...) __attribute__((sentinel));],
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232 [$1], [$2])
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233 ])
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234
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235 AC_DEFUN([CC_ATTRIBUTE_DEPRECATED], [
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236 CC_CHECK_ATTRIBUTE(
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237 [deprecated], ,
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238 [void some_function(void *foo, ...) __attribute__((deprecated));],
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239 [$1], [$2])
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240 ])
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241
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242 AC_DEFUN([CC_ATTRIBUTE_ALIAS], [
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243 CC_CHECK_ATTRIBUTE(
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244 [alias], [weak, alias],
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245 [void other_function(void *foo) { }
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246 void some_function(void *foo) __attribute__((weak, alias("other_function")));],
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247 [$1], [$2])
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248 ])
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249
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250 AC_DEFUN([CC_ATTRIBUTE_MALLOC], [
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251 CC_CHECK_ATTRIBUTE(
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252 [malloc], ,
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253 [void * __attribute__((malloc)) my_alloc(int n);],
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254 [$1], [$2])
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255 ])
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256
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257 AC_DEFUN([CC_ATTRIBUTE_PACKED], [
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258 CC_CHECK_ATTRIBUTE(
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259 [packed], ,
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260 [struct astructure { char a; int b; long c; void *d; } __attribute__((packed));],
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261 [$1], [$2])
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262 ])
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263
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264 AC_DEFUN([CC_ATTRIBUTE_CONST], [
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265 CC_CHECK_ATTRIBUTE(
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266 [const], ,
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267 [int __attribute__((const)) twopow(int n) { return 1 << n; } ],
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268 [$1], [$2])
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269 ])
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270
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271 AC_DEFUN([CC_FLAG_VISIBILITY], [
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272 AC_REQUIRE([CC_CHECK_WERROR])
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273 AC_CACHE_CHECK([if $CC supports -fvisibility=hidden],
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274 [cc_cv_flag_visibility],
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275 [cc_flag_visibility_save_CFLAGS="$CFLAGS"
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276 CFLAGS="$CFLAGS $cc_cv_werror"
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277 CC_CHECK_CFLAGS_SILENT([-fvisibility=hidden],
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278 cc_cv_flag_visibility='yes',
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279 cc_cv_flag_visibility='no')
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280 CFLAGS="$cc_flag_visibility_save_CFLAGS"])
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281
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282 AS_IF([test "x$cc_cv_flag_visibility" = "xyes"],
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283 [AC_DEFINE([SUPPORT_FLAG_VISIBILITY], 1,
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284 [Define this if the compiler supports the -fvisibility flag])
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285 $1],
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286 [$2])
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287 ])
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288
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289 AC_DEFUN([CC_FUNC_EXPECT], [
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290 AC_REQUIRE([CC_CHECK_WERROR])
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291 AC_CACHE_CHECK([if compiler has __builtin_expect function],
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292 [cc_cv_func_expect],
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293 [ac_save_CFLAGS="$CFLAGS"
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294 CFLAGS="$CFLAGS $cc_cv_werror"
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295 AC_LANG_PUSH([C])
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296 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
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297 [int some_function() {
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298 int a = 3;
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299 return (int)__builtin_expect(a, 3);
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300 }])],
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301 [cc_cv_func_expect=yes],
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302 [cc_cv_func_expect=no])
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303 AC_LANG_POP([C])
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304 CFLAGS="$ac_save_CFLAGS"
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305 ])
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306
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307 AS_IF([test "x$cc_cv_func_expect" = "xyes"],
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308 [AC_DEFINE([SUPPORT__BUILTIN_EXPECT], 1,
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309 [Define this if the compiler supports __builtin_expect() function])
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310 $1],
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311 [$2])
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312 ])
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313
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314 AC_DEFUN([CC_ATTRIBUTE_ALIGNED], [
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315 AC_REQUIRE([CC_CHECK_WERROR])
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316 AC_CACHE_CHECK([highest __attribute__ ((aligned ())) supported],
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317 [cc_cv_attribute_aligned],
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318 [ac_save_CFLAGS="$CFLAGS"
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319 CFLAGS="$CFLAGS $cc_cv_werror"
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320 AC_LANG_PUSH([C])
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321 for cc_attribute_align_try in 64 32 16 8 4 2; do
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322 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
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323 int main() {
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324 static char c __attribute__ ((aligned($cc_attribute_align_try))) = 0;
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325 return c;
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326 }])], [cc_cv_attribute_aligned=$cc_attribute_align_try; break])
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327 done
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328 AC_LANG_POP([C])
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329 CFLAGS="$ac_save_CFLAGS"
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330 ])
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331
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332 if test "x$cc_cv_attribute_aligned" != "x"; then
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333 AC_DEFINE_UNQUOTED([ATTRIBUTE_ALIGNED_MAX], [$cc_cv_attribute_aligned],
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334 [Define the highest alignment supported])
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335 fi
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336 ])
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