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225 lines
8.9 KiB
225 lines
8.9 KiB
# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_cflags_gcc_option.html
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# ===========================================================================
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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(-fomit-frame-pointer) would show a message like
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# "checking CFLAGS for gcc -fomit-frame-pointer ... yes" and add 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 from
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# 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 to
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# CXXFLAGS - and it uses the autoconf setup for C++ instead of C (since it
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# 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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# ax_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 if you
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# would make up a new function-macro and submit it to the 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 option-to-check-for.
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#
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# There are other variants that emerged from the original macro variant
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# which did just test an option to be possibly added. However, some
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# compilers accept an option silently, or possibly for just another option
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# that was not intended. Therefore, we have to do a generic test for a
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# compiler family. For gcc we check "-pedantic" being accepted which is
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# also understood by compilers who just want to be compatible with gcc
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# even when not being made from gcc sources.
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#
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# See also: AX_CFLAGS_SUN_OPTION, AX_CFLAGS_HPUX_OPTION,
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# AX_CFLAGS_AIX_OPTION, and AX_CFLAGS_IRIX_OPTION.
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#
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# LICENSE
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#
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# Copyright (c) 2008 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 modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 2 of the License, or (at your
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# 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 General
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# 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 along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# As a special exception, the respective Autoconf Macro's copyright owner
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# gives unlimited permission to copy, distribute and modify the configure
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# scripts that are the output of Autoconf when processing the Macro. You
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# need not follow the terms of the GNU General Public License when using
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# or distributing such scripts, even though portions of the text of the
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# Macro appear in them. The GNU General Public License (GPL) does govern
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# all other use of the material that constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the Autoconf
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# Macro released by the Autoconf Archive. When you make and distribute a
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# modified version of the Autoconf Macro, you may extend this special
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# exception to the GPL to apply to your modified version as well.
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#serial 12
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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],[ax_cv_cflags_gcc_option_$2])dnl
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AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
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VAR,[AS_VAR_SET([VAR],["no, unknown"])
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AC_LANG_SAVE
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AC_LANG_C
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ac_save_[]FLAGS="$[]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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[AS_VAR_SET([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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m4_ifdef([AS_VAR_COPY],[AS_VAR_COPY([var],[VAR])],[var=AS_VAR_GET([VAR])])
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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],[ax_cv_cxxflags_gcc_option_$2])dnl
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AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
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VAR,[AS_VAR_SET([VAR],["no, unknown"])
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AC_LANG_SAVE
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AC_LANG_CPLUSPLUS
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ac_save_[]FLAGS="$[]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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[AS_VAR_SET([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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m4_ifdef([AS_VAR_COPY],[AS_VAR_COPY([var],[VAR])],[var=AS_VAR_GET([VAR])])
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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],[ax_cv_cflags_gcc_option_$1])dnl
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AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
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VAR,[AS_VAR_SET([VAR],["no, unknown"])
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AC_LANG_SAVE
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AC_LANG_C
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ac_save_[]FLAGS="$[]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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[AS_VAR_SET([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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m4_ifdef([AS_VAR_COPY],[AS_VAR_COPY([var],[VAR])],[var=AS_VAR_GET([VAR])])
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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],[ax_cv_cxxflags_gcc_option_$1])dnl
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AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
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VAR,[AS_VAR_SET([VAR],["no, unknown"])
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AC_LANG_SAVE
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AC_LANG_CPLUSPLUS
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ac_save_[]FLAGS="$[]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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[AS_VAR_SET([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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m4_ifdef([AS_VAR_COPY],[AS_VAR_COPY([var],[VAR])],[var=AS_VAR_GET([VAR])])
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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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