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110 lines
4.1 KiB
Plaintext
110 lines
4.1 KiB
Plaintext
dnl @synopsis AX_CFLAGS_GCC_OPTION (optionflag [,[shellvar][,[A][,[NA]]])
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dnl
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dnl AX_CFLAGS_GCC_OPTION(-fvomit-frame) would show a message as like
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dnl "checking CFLAGS for gcc -fvomit-frame ... yes" and adds
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dnl the optionflag to CFLAGS if it is understood. You can override
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dnl the shellvar-default of CFLAGS of course. The order of arguments
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dnl stems from the explicit macros like AX_CFLAGS_WARN_ALL.
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dnl
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dnl The macro is a lot simpler than any special AX_CFLAGS_* macro (or
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dnl ac_cxx_rtti.m4 macro) but allows to check for arbitrary options.
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dnl However, if you use this macro in a few places, it would be great
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dnl if you would make up a new function-macro and submit it to the
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dnl ac-archive.
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dnl
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dnl - $1 option-to-check-for : required ("-option" as non-value)
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dnl - $2 shell-variable-to-add-to : CFLAGS
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dnl - $3 action-if-found : add value to shellvariable
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dnl - $4 action-if-not-found : nothing
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dnl
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dnl note: in earlier versions, $1-$2 were swapped. We try to detect the
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dnl situation and accept a $2=~/-/ as being the old option-to-check-for.
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dnl
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dnl also: there are other variants that emerged from the original macro
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dnl variant which did just test an option to be possibly added. However,
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dnl some compilers accept an option silently, or possibly for just
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dnl another option that was not intended. Therefore, we have to do a
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dnl generic test for a compiler family. For gcc we check "-pedantic"
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dnl being accepted which is also understood by compilers who just want
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dnl to be compatible with gcc even when not being made from gcc sources.
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dnl
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dnl see also:
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dnl AX_CFLAGS_SUN_OPTION AX_CFLAGS_HPUX_OPTION
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dnl AX_CFLAGS_AIX_OPTION AX_CFLAGS_IRIX_OPTION
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dnl
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dnl @, tested, experimental
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dnl @version $Id: ax_cflags_gcc_option.m4,v 1.5 2003/11/29 08:13:25 guidod Exp $
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dnl @author Guido Draheim <guidod@gmx.de>
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dnl http://ac-archive.sourceforge.net/C_Support/ax_cflags_gcc_option.m4
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dnl
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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 % m4_ifval($2,$2,-option)" dnl GCC
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#
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do FLAGS="$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 % m4_ifval($1,$1,-option)" dnl GCC
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#
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do FLAGS="$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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