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: m4/ax_cflags_gcc_option.m4
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- Committer: Bazaar Package Importer
- Author(s): Matthias Klose
- Date: 2008-11-11 05:58:19 UTC
- mto: This revision was merged to the branch mainline in revision 8.
- Revision ID: james.westby@ubuntu.com-20081111055819-y7rp49bl4rjmmlge
Tags: upstream-0.97
Import upstream version 0.97
added
removed
m4/ax_cflags_gcc_option.m4
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##### http://autoconf-archive.cryp.to/ax_cflags_gcc_option.html
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#
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# SYNOPSIS
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#
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# AX_CFLAGS_GCC_OPTION (optionflag [,[shellvar][,[A][,[NA]]])
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#
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# DESCRIPTION
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#
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# AX_CFLAGS_GCC_OPTION(-fvomit-frame) would show a message as like
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# "checking CFLAGS for gcc -fvomit-frame ... yes" and adds the
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# optionflag to CFLAGS if it is understood. You can override the
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# shellvar-default of CFLAGS of course. The order of arguments stems
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# from the explicit macros like AX_CFLAGS_WARN_ALL.
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#
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# The cousin AX_CXXFLAGS_GCC_OPTION would check for an option to add
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# to CXXFLAGS - and it uses the autoconf setup for C++ instead of C
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# (since it is possible to use different compilers for C and C++).
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#
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# The macro is a lot simpler than any special AX_CFLAGS_* macro (or
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# ac_cxx_rtti.m4 macro) but allows to check for arbitrary options.
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# However, if you use this macro in a few places, it would be great
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# if you would make up a new function-macro and submit it to the
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# ac-archive.
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#
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# - $1 option-to-check-for : required ("-option" as non-value)
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# - $2 shell-variable-to-add-to : CFLAGS (or CXXFLAGS in the other case)
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# - $3 action-if-found : add value to shellvariable
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# - $4 action-if-not-found : nothing
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#
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# note: in earlier versions, $1-$2 were swapped. We try to detect the
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# situation and accept a $2=~/-/ as being the old
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# option-to-check-for.
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#
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# also: there are other variants that emerged from the original macro
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# variant which did just test an option to be possibly added.
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# However, some compilers accept an option silently, or possibly for
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# just another option that was not intended. Therefore, we have to do
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# a generic test for a compiler family. For gcc we check "-pedantic"
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# being accepted which is also understood by compilers who just want
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# to be compatible with gcc even when not being made from gcc
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# sources.
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#
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# see also:
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#
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# AX_CFLAGS_SUN_OPTION AX_CFLAGS_HPUX_OPTION
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# AX_CFLAGS_AIX_OPTION AX_CFLAGS_IRIX_OPTION
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#
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# LAST MODIFICATION
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#
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# 2006-12-12
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#
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# COPYLEFT
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#
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# Copyright (c) 2006 Guido U. Draheim <guidod@gmx.de>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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# 02111-1307, USA.
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#
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# As a special exception, the respective Autoconf Macro's copyright
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# owner gives unlimited permission to copy, distribute and modify the
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# configure scripts that are the output of Autoconf when processing
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# the Macro. You need not follow the terms of the GNU General Public
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# License when using or distributing such scripts, even though
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# portions of the text of the Macro appear in them. The GNU General
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# Public License (GPL) does govern all other use of the material that
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# constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the
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# Autoconf Macro released by the Autoconf Macro Archive. When you
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# make and distribute a modified version of the Autoconf Macro, you
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# may extend this special exception to the GPL to apply to your
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# modified version as well.
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AC_DEFUN([AX_CFLAGS_GCC_OPTION_OLD], [dnl
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AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
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AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_gcc_option_$2])dnl
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AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
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VAR,[VAR="no, unknown"
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AC_LANG_SAVE
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AC_LANG_C
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ac_save_[]FLAGS="$[]FLAGS"
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for ac_arg dnl
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in "-pedantic -Werror % m4_ifval($2,$2,-option)" dnl GCC
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"-pedantic % m4_ifval($2,$2,-option) %% no, obsolete" dnl new GCC
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#
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do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
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AC_TRY_COMPILE([],[return 0;],
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[VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
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done
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FLAGS="$ac_save_[]FLAGS"
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AC_LANG_RESTORE
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])
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case ".$VAR" in
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.ok|.ok,*) m4_ifvaln($3,$3) ;;
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.|.no|.no,*) m4_ifvaln($4,$4) ;;
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*) m4_ifvaln($3,$3,[
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if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
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then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
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else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
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m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
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fi ]) ;;
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esac
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AS_VAR_POPDEF([VAR])dnl
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AS_VAR_POPDEF([FLAGS])dnl
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])
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dnl the only difference - the LANG selection... and the default FLAGS
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AC_DEFUN([AX_CXXFLAGS_GCC_OPTION_OLD], [dnl
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AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
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AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_gcc_option_$2])dnl
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AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
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VAR,[VAR="no, unknown"
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AC_LANG_SAVE
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AC_LANG_CPLUSPLUS
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ac_save_[]FLAGS="$[]FLAGS"
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for ac_arg dnl
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in "-pedantic -Werror % m4_ifval($2,$2,-option)" dnl GCC
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"-pedantic % m4_ifval($2,$2,-option) %% no, obsolete" dnl new GCC
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#
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do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
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AC_TRY_COMPILE([],[return 0;],
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[VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
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done
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FLAGS="$ac_save_[]FLAGS"
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AC_LANG_RESTORE
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])
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case ".$VAR" in
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.ok|.ok,*) m4_ifvaln($3,$3) ;;
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.|.no|.no,*) m4_ifvaln($4,$4) ;;
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*) m4_ifvaln($3,$3,[
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if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
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then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
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else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
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m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
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fi ]) ;;
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esac
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AS_VAR_POPDEF([VAR])dnl
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AS_VAR_POPDEF([FLAGS])dnl
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])
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dnl -------------------------------------------------------------------------
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AC_DEFUN([AX_CFLAGS_GCC_OPTION_NEW], [dnl
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AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
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AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_gcc_option_$1])dnl
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AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
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VAR,[VAR="no, unknown"
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AC_LANG_SAVE
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AC_LANG_C
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ac_save_[]FLAGS="$[]FLAGS"
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for ac_arg dnl
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in "-pedantic -Werror % m4_ifval($1,$1,-option)" dnl GCC
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"-pedantic % m4_ifval($1,$1,-option) %% no, obsolete" dnl new GCC
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#
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do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
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AC_TRY_COMPILE([],[return 0;],
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[VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
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done
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FLAGS="$ac_save_[]FLAGS"
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AC_LANG_RESTORE
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])
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case ".$VAR" in
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.ok|.ok,*) m4_ifvaln($3,$3) ;;
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.|.no|.no,*) m4_ifvaln($4,$4) ;;
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*) m4_ifvaln($3,$3,[
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if echo " $[]m4_ifval($2,$2,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
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then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain $VAR])
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else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"])
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m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"
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fi ]) ;;
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esac
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AS_VAR_POPDEF([VAR])dnl
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AS_VAR_POPDEF([FLAGS])dnl
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])
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dnl the only difference - the LANG selection... and the default FLAGS
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AC_DEFUN([AX_CXXFLAGS_GCC_OPTION_NEW], [dnl
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AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
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AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_gcc_option_$1])dnl
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AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
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VAR,[VAR="no, unknown"
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AC_LANG_SAVE
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AC_LANG_CPLUSPLUS
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ac_save_[]FLAGS="$[]FLAGS"
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for ac_arg dnl
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in "-pedantic -Werror % m4_ifval($1,$1,-option)" dnl GCC
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"-pedantic % m4_ifval($1,$1,-option) %% no, obsolete" dnl new GCC
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#
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do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
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AC_TRY_COMPILE([],[return 0;],
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[VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
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done
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FLAGS="$ac_save_[]FLAGS"
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AC_LANG_RESTORE
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])
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case ".$VAR" in
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.ok|.ok,*) m4_ifvaln($3,$3) ;;
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.|.no|.no,*) m4_ifvaln($4,$4) ;;
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*) m4_ifvaln($3,$3,[
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if echo " $[]m4_ifval($2,$2,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
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then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain $VAR])
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else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"])
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m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"
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fi ]) ;;
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esac
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AS_VAR_POPDEF([VAR])dnl
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AS_VAR_POPDEF([FLAGS])dnl
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])
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AC_DEFUN([AX_CFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
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[AX_CFLAGS_GCC_OPTION_NEW($@)],[AX_CFLAGS_GCC_OPTION_OLD($@)])])
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AC_DEFUN([AX_CXXFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
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[AX_CXXFLAGS_GCC_OPTION_NEW($@)],[AX_CXXFLAGS_GCC_OPTION_OLD($@)])])
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