build/aclocal/ax_cflags_gcc_option.m4

   1 # ===========================================================================
   2 #          http://autoconf-archive.cryp.to/ax_cflags_gcc_option.html
   3 # ===========================================================================
   4 #
   5 # SYNOPSIS
   6 #
   7 #   AX_CFLAGS_GCC_OPTION (optionflag [,[shellvar][,[A][,[NA]]])
   8 #
   9 # DESCRIPTION
  10 #
  11 #   AX_CFLAGS_GCC_OPTION(-fvomit-frame) would show a message as like
  12 #   "checking CFLAGS for gcc -fvomit-frame ... yes" and adds the optionflag
  13 #   to CFLAGS if it is understood. You can override the shellvar-default of
  14 #   CFLAGS of course. The order of arguments stems from the explicit macros
  15 #   like AX_CFLAGS_WARN_ALL.
  16 #
  17 #   The cousin AX_CXXFLAGS_GCC_OPTION would check for an option to add to
  18 #   CXXFLAGS - and it uses the autoconf setup for C++ instead of C (since it
  19 #   is possible to use different compilers for C and C++).
  20 #
  21 #   The macro is a lot simpler than any special AX_CFLAGS_* macro (or
  22 #   ac_cxx_rtti.m4 macro) but allows to check for arbitrary options.
  23 #   However, if you use this macro in a few places, it would be great if you
  24 #   would make up a new function-macro and submit it to the ac-archive.
  25 #
  26 #     - $1 option-to-check-for : required ("-option" as non-value)
  27 #     - $2 shell-variable-to-add-to : CFLAGS (or CXXFLAGS in the other case)
  28 #     - $3 action-if-found : add value to shellvariable
  29 #     - $4 action-if-not-found : nothing
  30 #
  31 #   Note: in earlier versions, $1-$2 were swapped. We try to detect the
  32 #   situation and accept a $2=~/-/ as being the old option-to-check-for.
  33 #
  34 #   There are other variants that emerged from the original macro variant
  35 #   which did just test an option to be possibly added. However, some
  36 #   compilers accept an option silently, or possibly for just another option
  37 #   that was not intended. Therefore, we have to do a generic test for a
  38 #   compiler family. For gcc we check "-pedantic" being accepted which is
  39 #   also understood by compilers who just want to be compatible with gcc
  40 #   even when not being made from gcc sources.
  41 #
  42 #   See also: AX_CFLAGS_SUN_OPTION, AX_CFLAGS_HPUX_OPTION,
  43 #   AX_CFLAGS_AIX_OPTION, and AX_CFLAGS_IRIX_OPTION.
  44 #
  45 # LAST MODIFICATION
  46 #
  47 #   2008-04-12
  48 #
  49 # COPYLEFT
  50 #
  51 #   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
  52 #
  53 #   This program is free software; you can redistribute it and/or modify it
  54 #   under the terms of the GNU General Public License as published by the
  55 #   Free Software Foundation; either version 2 of the License, or (at your
  56 #   option) any later version.
  57 #
  58 #   This program is distributed in the hope that it will be useful, but
  59 #   WITHOUT ANY WARRANTY; without even the implied warranty of
  60 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
  61 #   Public License for more details.
  62 #
  63 #   You should have received a copy of the GNU General Public License along
  64 #   with this program. If not, see <http://www.gnu.org/licenses/>.
  65 #
  66 #   As a special exception, the respective Autoconf Macro's copyright owner
  67 #   gives unlimited permission to copy, distribute and modify the configure
  68 #   scripts that are the output of Autoconf when processing the Macro. You
  69 #   need not follow the terms of the GNU General Public License when using
  70 #   or distributing such scripts, even though portions of the text of the
  71 #   Macro appear in them. The GNU General Public License (GPL) does govern
  72 #   all other use of the material that constitutes the Autoconf Macro.
  73 #
  74 #   This special exception to the GPL applies to versions of the Autoconf
  75 #   Macro released by the Autoconf Macro Archive. When you make and
  76 #   distribute a modified version of the Autoconf Macro, you may extend this
  77 #   special exception to the GPL to apply to your modified version as well.
  78
  79 AC_DEFUN([AX_CFLAGS_GCC_OPTION_OLD], [dnl
  80 AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
  81 AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_gcc_option_$2])dnl
  82 AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
  83 VAR,[VAR="no, unknown"
  84  AC_LANG_SAVE
  85  AC_LANG_C
  86  ac_save_[]FLAGS="$[]FLAGS"
  87 for ac_arg dnl
  88 in "-pedantic -Werror % m4_ifval($2,$2,-option)"  dnl   GCC
  89    "-pedantic % m4_ifval($2,$2,-option) %% no, obsolete"  dnl new GCC
  90    #
  91 do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
  92    AC_TRY_COMPILE([],[return 0;],
  93    [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
  94 done
  95  FLAGS="$ac_save_[]FLAGS"
  96  AC_LANG_RESTORE
  97 ])
  98 case ".$VAR" in
  99      .ok|.ok,*) m4_ifvaln($3,$3) ;;
 100    .|.no|.no,*) m4_ifvaln($4,$4) ;;
 101    *) m4_ifvaln($3,$3,[
 102    if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
 103    then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
 104    else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
 105                       m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
 106    fi ]) ;;
 107 esac
 108 AS_VAR_POPDEF([VAR])dnl
 109 AS_VAR_POPDEF([FLAGS])dnl
 110 ])
 111
 112
 113 dnl the only difference - the LANG selection... and the default FLAGS
 114
 115 AC_DEFUN([AX_CXXFLAGS_GCC_OPTION_OLD], [dnl
 116 AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
 117 AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_gcc_option_$2])dnl
 118 AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
 119 VAR,[VAR="no, unknown"
 120  AC_LANG_SAVE
 121  AC_LANG_CPLUSPLUS
 122  ac_save_[]FLAGS="$[]FLAGS"
 123 for ac_arg dnl
 124 in "-pedantic -Werror % m4_ifval($2,$2,-option)"  dnl   GCC
 125    "-pedantic % m4_ifval($2,$2,-option) %% no, obsolete"  dnl new GCC
 126    #
 127 do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
 128    AC_TRY_COMPILE([],[return 0;],
 129    [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
 130 done
 131  FLAGS="$ac_save_[]FLAGS"
 132  AC_LANG_RESTORE
 133 ])
 134 case ".$VAR" in
 135      .ok|.ok,*) m4_ifvaln($3,$3) ;;
 136    .|.no|.no,*) m4_ifvaln($4,$4) ;;
 137    *) m4_ifvaln($3,$3,[
 138    if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
 139    then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
 140    else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
 141                       m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
 142    fi ]) ;;
 143 esac
 144 AS_VAR_POPDEF([VAR])dnl
 145 AS_VAR_POPDEF([FLAGS])dnl
 146 ])
 147
 148 dnl -------------------------------------------------------------------------
 149
 150 AC_DEFUN([AX_CFLAGS_GCC_OPTION_NEW], [dnl
 151 AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
 152 AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_gcc_option_$1])dnl
 153 AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
 154 VAR,[VAR="no, unknown"
 155  AC_LANG_SAVE
 156  AC_LANG_C
 157  ac_save_[]FLAGS="$[]FLAGS"
 158 for ac_arg dnl
 159 in "-pedantic -Werror % m4_ifval($1,$1,-option)"  dnl   GCC
 160    "-pedantic % m4_ifval($1,$1,-option) %% no, obsolete"  dnl new GCC
 161    #
 162 do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
 163    AC_TRY_COMPILE([],[return 0;],
 164    [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
 165 done
 166  FLAGS="$ac_save_[]FLAGS"
 167  AC_LANG_RESTORE
 168 ])
 169 case ".$VAR" in
 170      .ok|.ok,*) m4_ifvaln($3,$3) ;;
 171    .|.no|.no,*) m4_ifvaln($4,$4) ;;
 172    *) m4_ifvaln($3,$3,[
 173    if echo " $[]m4_ifval($2,$2,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
 174    then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain $VAR])
 175    else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"])
 176                       m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"
 177    fi ]) ;;
 178 esac
 179 AS_VAR_POPDEF([VAR])dnl
 180 AS_VAR_POPDEF([FLAGS])dnl
 181 ])
 182
 183
 184 dnl the only difference - the LANG selection... and the default FLAGS
 185
 186 AC_DEFUN([AX_CXXFLAGS_GCC_OPTION_NEW], [dnl
 187 AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
 188 AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_gcc_option_$1])dnl
 189 AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
 190 VAR,[VAR="no, unknown"
 191  AC_LANG_SAVE
 192  AC_LANG_CPLUSPLUS
 193  ac_save_[]FLAGS="$[]FLAGS"
 194 for ac_arg dnl
 195 in "-pedantic -Werror % m4_ifval($1,$1,-option)"  dnl   GCC
 196    "-pedantic % m4_ifval($1,$1,-option) %% no, obsolete"  dnl new GCC
 197    #
 198 do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
 199    AC_TRY_COMPILE([],[return 0;],
 200    [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
 201 done
 202  FLAGS="$ac_save_[]FLAGS"
 203  AC_LANG_RESTORE
 204 ])
 205 case ".$VAR" in
 206      .ok|.ok,*) m4_ifvaln($3,$3) ;;
 207    .|.no|.no,*) m4_ifvaln($4,$4) ;;
 208    *) m4_ifvaln($3,$3,[
 209    if echo " $[]m4_ifval($2,$2,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
 210    then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain $VAR])
 211    else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"])
 212                       m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"
 213    fi ]) ;;
 214 esac
 215 AS_VAR_POPDEF([VAR])dnl
 216 AS_VAR_POPDEF([FLAGS])dnl
 217 ])
 218
 219 AC_DEFUN([AX_CFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
 220 [AX_CFLAGS_GCC_OPTION_NEW($@)],[AX_CFLAGS_GCC_OPTION_OLD($@)])])
 221
 222 AC_DEFUN([AX_CXXFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
 223 [AX_CXXFLAGS_GCC_OPTION_NEW($@)],[AX_CXXFLAGS_GCC_OPTION_OLD($@)])])