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1 # Autoconf include file defining macros related to compile-time warnings.
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2
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3 # Copyright 2004, 2005, 2007, 2009, 2011 Free Software Foundation, Inc.
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4
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5 #This file is part of GCC.
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6
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7 #GCC is free software; you can redistribute it and/or modify it under
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8 #the terms of the GNU General Public License as published by the Free
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9 #Software Foundation; either version 3, or (at your option) any later
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10 #version.
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11
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12 #GCC 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 GCC; see the file COPYING3. If not see
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19 #<http://www.gnu.org/licenses/>.
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20
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111
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21 # ACX_PROG_CC_WARNING_OPTS(WARNINGS, [VARIABLE = WARN_CFLAGS])
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22 # Sets @VARIABLE@ to the subset of the given options which the
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23 # compiler accepts.
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24 AC_DEFUN([ACX_PROG_CC_WARNING_OPTS],
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25 [AC_REQUIRE([AC_PROG_CC])dnl
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26 AC_LANG_PUSH(C)
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27 m4_pushdef([acx_Var], [m4_default([$2], [WARN_CFLAGS])])dnl
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28 AC_SUBST(acx_Var)dnl
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29 m4_expand_once([acx_Var=
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30 ],m4_quote(acx_Var=))dnl
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31 save_CFLAGS="$CFLAGS"
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111
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32 for real_option in $1; do
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33 # Do the check with the no- prefix removed since gcc silently
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34 # accepts any -Wno-* option on purpose
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35 case $real_option in
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36 -Wno-*) option=-W`expr x$real_option : 'x-Wno-\(.*\)'` ;;
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37 *) option=$real_option ;;
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38 esac
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39 AS_VAR_PUSHDEF([acx_Woption], [acx_cv_prog_cc_warning_$option])
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40 AC_CACHE_CHECK([whether $CC supports $option], acx_Woption,
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41 [CFLAGS="$option"
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42 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],
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43 [AS_VAR_SET(acx_Woption, yes)],
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44 [AS_VAR_SET(acx_Woption, no)])
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45 ])
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46 AS_IF([test AS_VAR_GET(acx_Woption) = yes],
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47 [acx_Var="$acx_Var${acx_Var:+ }$real_option"])
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48 AS_VAR_POPDEF([acx_Woption])dnl
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49 done
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50 CFLAGS="$save_CFLAGS"
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51 m4_popdef([acx_Var])dnl
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52 AC_LANG_POP(C)
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53 ])# ACX_PROG_CC_WARNING_OPTS
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54
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55 # ACX_PROG_CC_WARNING_ALMOST_PEDANTIC(WARNINGS, [VARIABLE = WARN_PEDANTIC])
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56 # Append to VARIABLE "-pedantic" + the argument, if the compiler is GCC
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57 # and accepts all of those options simultaneously, otherwise to nothing.
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58 AC_DEFUN([ACX_PROG_CC_WARNING_ALMOST_PEDANTIC],
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59 [AC_REQUIRE([AC_PROG_CC])dnl
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60 AC_LANG_PUSH(C)
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61 m4_pushdef([acx_Var], [m4_default([$2], [WARN_PEDANTIC])])dnl
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62 AC_SUBST(acx_Var)dnl
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63 m4_expand_once([acx_Var=
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64 ],m4_quote(acx_Var=))dnl
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65 # Do the check with the no- prefix removed from the warning options
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66 # since gcc silently accepts any -Wno-* option on purpose
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67 m4_pushdef([acx_Woptions], [m4_bpatsubst([$1], [-Wno-], [-W])])dnl
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68 AS_VAR_PUSHDEF([acx_Pedantic], [acx_cv_prog_cc_pedantic_]acx_Woptions)dnl
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69 AS_IF([test "$GCC" = yes],
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70 [AC_CACHE_CHECK([whether $CC supports -pedantic ]acx_Woptions, acx_Pedantic,
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71 [save_CFLAGS="$CFLAGS"
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72 CFLAGS="-pedantic acx_Woptions"
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73 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],
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74 [AS_VAR_SET(acx_Pedantic, yes)],
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75 [AS_VAR_SET(acx_Pedantic, no)])
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76 CFLAGS="$save_CFLAGS"])
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77 AS_IF([test AS_VAR_GET(acx_Pedantic) = yes],
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78 [acx_Var="$acx_Var${acx_Var:+ }-pedantic $1"])
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79 ])
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80 AS_VAR_POPDEF([acx_Pedantic])dnl
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81 m4_popdef([acx_Woptions])dnl
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82 m4_popdef([acx_Var])dnl
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83 AC_LANG_POP(C)
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84 ])# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC
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85
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86 # ACX_PROG_CC_WARNINGS_ARE_ERRORS([x.y.z], [VARIABLE = WERROR])
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87 # sets @VARIABLE@ to "-Werror" if the compiler is GCC >=x.y.z, or if
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88 # --enable-werror-always was given on the command line, otherwise
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89 # to nothing.
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90 # If the argument is the word "manual" instead of a version number,
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91 # then @VARIABLE@ will be set to -Werror only if --enable-werror-always
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92 # appeared on the configure command line.
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93 AC_DEFUN([ACX_PROG_CC_WARNINGS_ARE_ERRORS],
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94 [AC_REQUIRE([AC_PROG_CC])dnl
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95 AC_LANG_PUSH(C)
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96 m4_pushdef([acx_Var], [m4_default([$2], [WERROR])])dnl
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97 AC_SUBST(acx_Var)dnl
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98 m4_expand_once([acx_Var=
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99 ],m4_quote(acx_Var=))dnl
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100 AC_ARG_ENABLE(werror-always,
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101 AS_HELP_STRING([--enable-werror-always],
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102 [enable -Werror despite compiler version]),
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103 [], [enable_werror_always=no])
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104 AS_IF([test $enable_werror_always = yes],
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105 [acx_Var="$acx_Var${acx_Var:+ }-Werror"])
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106 m4_if($1, [manual],,
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107 [AS_VAR_PUSHDEF([acx_GCCvers], [acx_cv_prog_cc_gcc_$1_or_newer])dnl
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108 AC_CACHE_CHECK([whether $CC is GCC >=$1], acx_GCCvers,
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109 [set fnord `echo $1 | tr '.' ' '`
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110 shift
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111 AC_PREPROC_IFELSE(
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112 [#if __GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ \
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113 < [$]1 * 10000 + [$]2 * 100 + [$]3
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114 #error insufficient
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115 #endif],
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116 [AS_VAR_SET(acx_GCCvers, yes)],
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117 [AS_VAR_SET(acx_GCCvers, no)])])
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118 AS_IF([test AS_VAR_GET(acx_GCCvers) = yes],
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119 [acx_Var="$acx_Var${acx_Var:+ }-Werror"])
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120 AS_VAR_POPDEF([acx_GCCvers])])
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121 m4_popdef([acx_Var])dnl
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122 AC_LANG_POP(C)
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123 ])# ACX_PROG_CC_WARNINGS_ARE_ERRORS
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124
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125 # ACX_PROG_CXX_WARNING_OPTS(WARNINGS, [VARIABLE = WARN_CXXFLAGS])
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126 # Sets @VARIABLE@ to the subset of the given options which the
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127 # compiler accepts.
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128 AC_DEFUN([ACX_PROG_CXX_WARNING_OPTS],
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129 [AC_REQUIRE([AC_PROG_CXX])dnl
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130 AC_LANG_PUSH(C++)
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131 m4_pushdef([acx_Var], [m4_default([$2], [WARN_CXXFLAGS])])dnl
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132 AC_SUBST(acx_Var)dnl
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133 m4_expand_once([acx_Var=
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134 ],m4_quote(acx_Var=))dnl
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135 save_CXXFLAGS="$CXXFLAGS"
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136 for real_option in $1; do
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137 # Do the check with the no- prefix removed since gcc silently
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138 # accepts any -Wno-* option on purpose
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139 case $real_option in
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140 -Wno-*) option=-W`expr x$real_option : 'x-Wno-\(.*\)'` ;;
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141 *) option=$real_option ;;
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142 esac
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143 AS_VAR_PUSHDEF([acx_Woption], [acx_cv_prog_cc_warning_$option])
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144 AC_CACHE_CHECK([whether $CXX supports $option], acx_Woption,
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145 [CXXFLAGS="$option"
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146 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],
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147 [AS_VAR_SET(acx_Woption, yes)],
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148 [AS_VAR_SET(acx_Woption, no)])
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149 ])
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150 AS_IF([test AS_VAR_GET(acx_Woption) = yes],
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151 [acx_Var="$acx_Var${acx_Var:+ }$real_option"])
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152 AS_VAR_POPDEF([acx_Woption])dnl
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153 done
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154 CXXFLAGS="$save_CXXFLAGS"
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155 m4_popdef([acx_Var])dnl
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156 AC_LANG_POP(C++)
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157 ])# ACX_PROG_CXX_WARNING_OPTS
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158
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159 # ACX_PROG_CXX_WARNING_ALMOST_PEDANTIC(WARNINGS, [VARIABLE = WARN_PEDANTIC])
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160 # Append to VARIABLE "-pedantic" + the argument, if the compiler is G++
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161 # and accepts all of those options simultaneously, otherwise to nothing.
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162 AC_DEFUN([ACX_PROG_CXX_WARNING_ALMOST_PEDANTIC],
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163 [AC_REQUIRE([AC_PROG_CXX])dnl
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164 AC_LANG_PUSH(C++)
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165 m4_pushdef([acx_Var], [m4_default([$2], [WARN_PEDANTIC])])dnl
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166 AC_SUBST(acx_Var)dnl
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167 m4_expand_once([acx_Var=
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168 ],m4_quote(acx_Var=))dnl
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169 # Do the check with the no- prefix removed from the warning options
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170 # since gcc silently accepts any -Wno-* option on purpose
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171 m4_pushdef([acx_Woptions], [m4_bpatsubst([$1], [-Wno-], [-W])])dnl
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172 AS_VAR_PUSHDEF([acx_Pedantic], [acx_cv_prog_cc_pedantic_]acx_Woptions)dnl
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173 AS_IF([test "$GXX" = yes],
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174 [AC_CACHE_CHECK([whether $CXX supports -pedantic ]acx_Woptions, acx_Pedantic,
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175 [save_CXXFLAGS="$CXXFLAGS"
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176 CXXFLAGS="-pedantic acx_Woptions"
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177 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],
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178 [AS_VAR_SET(acx_Pedantic, yes)],
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179 [AS_VAR_SET(acx_Pedantic, no)])
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180 CXXFLAGS="$save_CXXFLAGS"])
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181 AS_IF([test AS_VAR_GET(acx_Pedantic) = yes],
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182 [acx_Var="$acx_Var${acx_Var:+ }-pedantic $1"])
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183 ])
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184 AS_VAR_POPDEF([acx_Pedantic])dnl
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185 m4_popdef([acx_Woptions])dnl
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186 m4_popdef([acx_Var])dnl
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187 AC_LANG_POP(C++)
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188 ])# ACX_PROG_CXX_WARNING_ALMOST_PEDANTIC
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189
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190 # ACX_PROG_CXX_WARNINGS_ARE_ERRORS([x.y.z], [VARIABLE = WERROR])
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191 # sets @VARIABLE@ to "-Werror" if the compiler is G++ >=x.y.z, or if
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192 # --enable-werror-always was given on the command line, otherwise
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193 # to nothing.
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194 # If the argument is the word "manual" instead of a version number,
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195 # then @VARIABLE@ will be set to -Werror only if --enable-werror-always
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196 # appeared on the configure command line.
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197 AC_DEFUN([ACX_PROG_CXX_WARNINGS_ARE_ERRORS],
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198 [AC_REQUIRE([AC_PROG_CXX])dnl
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199 AC_LANG_PUSH(C++)
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200 m4_pushdef([acx_Var], [m4_default([$2], [WERROR])])dnl
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201 AC_SUBST(acx_Var)dnl
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202 m4_expand_once([acx_Var=
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203 ],m4_quote(acx_Var=))dnl
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204 AC_ARG_ENABLE(werror-always,
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205 AS_HELP_STRING([--enable-werror-always],
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206 [enable -Werror despite compiler version]),
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207 [], [enable_werror_always=no])
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208 AS_IF([test $enable_werror_always = yes],
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209 [acx_Var="$acx_Var${acx_Var:+ }-Werror"])
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210 m4_if($1, [manual],,
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211 [AS_VAR_PUSHDEF([acx_GXXvers], [acx_cv_prog_cxx_gxx_$1_or_newer])dnl
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212 AC_CACHE_CHECK([whether $CXX is G++ >=$1], acx_GXXvers,
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213 [set fnord `echo $1 | tr '.' ' '`
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214 shift
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215 AC_PREPROC_IFELSE(
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216 [#if __GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ \
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217 < [$]1 * 10000 + [$]2 * 100 + [$]3
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218 #error insufficient
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219 #endif],
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220 [AS_VAR_SET(acx_GXXvers, yes)],
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221 [AS_VAR_SET(acx_GXXvers, no)])])
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222 AS_IF([test AS_VAR_GET(acx_GXXvers) = yes],
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223 [acx_Var="$acx_Var${acx_Var:+ }-Werror"])
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224 AS_VAR_POPDEF([acx_GXXvers])])
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225 m4_popdef([acx_Var])dnl
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226 AC_LANG_POP(C++)
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227 ])# ACX_PROG_CXX_WARNINGS_ARE_ERRORS
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