| 1 | dnl @synopsis AX_CFLAGS_GCC_OPTION (optionflag [,[shellvar][,[A][,[NA]]])
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| 2 | dnl
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| 3 | dnl AX_CFLAGS_GCC_OPTION(-fvomit-frame) would show a message as like
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| 4 | dnl "checking CFLAGS for gcc -fvomit-frame ... yes" and adds
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| 5 | dnl the optionflag to CFLAGS if it is understood. You can override
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| 6 | dnl the shellvar-default of CFLAGS of course. The order of arguments
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| 7 | dnl stems from the explicit macros like AX_CFLAGS_WARN_ALL.
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| 8 | dnl
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| 9 | dnl The macro is a lot simpler than any special AX_CFLAGS_* macro (or
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| 10 | dnl ac_cxx_rtti.m4 macro) but allows to check for arbitrary options.
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| 11 | dnl However, if you use this macro in a few places, it would be great
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| 12 | dnl if you would make up a new function-macro and submit it to the
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| 13 | dnl ac-archive.
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| 14 | dnl
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| 15 | dnl - $1 option-to-check-for : required ("-option" as non-value)
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| 16 | dnl - $2 shell-variable-to-add-to : CFLAGS
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| 17 | dnl - $3 action-if-found : add value to shellvariable
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| 18 | dnl - $4 action-if-not-found : nothing
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| 19 | dnl
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| 20 | dnl note: in earlier versions, $1-$2 were swapped. We try to detect the
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| 21 | dnl situation and accept a $2=~/-/ as being the old option-to-check-for.
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| 22 | dnl
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| 23 | dnl also: there are other variants that emerged from the original macro
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| 24 | dnl variant which did just test an option to be possibly added. However,
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| 25 | dnl some compilers accept an option silently, or possibly for just
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| 26 | dnl another option that was not intended. Therefore, we have to do a
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| 27 | dnl generic test for a compiler family. For gcc we check "-pedantic"
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| 28 | dnl being accepted which is also understood by compilers who just want
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| 29 | dnl to be compatible with gcc even when not being made from gcc sources.
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| 30 | dnl
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| 31 | dnl see also:
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| 32 | dnl AX_CFLAGS_SUN_OPTION AX_CFLAGS_HPUX_OPTION
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| 33 | dnl AX_CFLAGS_AIX_OPTION AX_CFLAGS_IRIX_OPTION
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| 34 | dnl
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| 35 | dnl @, tested, experimental
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| 36 | dnl @version $Id: ax_cflags_gcc_option.m4,v 1.5 2003/11/29 08:13:25 guidod Exp $
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| 37 | dnl @author Guido Draheim <guidod@gmx.de>
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| 38 | dnl http://ac-archive.sourceforge.net/C_Support/ax_cflags_gcc_option.m4
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| 39 | dnl
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| 40 | AC_DEFUN([AX_CFLAGS_GCC_OPTION_OLD], [dnl
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| 41 | AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
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| 42 | AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_gcc_option_$2])dnl
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| 43 | AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
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| 44 | VAR,[VAR="no, unknown"
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| 45 | AC_LANG_SAVE
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| 46 | AC_LANG_C
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| 47 | ac_save_[]FLAGS="$[]FLAGS"
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| 48 | for ac_arg dnl
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| 49 | in "-pedantic % m4_ifval($2,$2,-option)" dnl GCC
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| 50 | #
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| 51 | do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
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| 52 | AC_TRY_COMPILE([],[return 0;],
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| 53 | [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
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| 54 | done
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| 55 | FLAGS="$ac_save_[]FLAGS"
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| 56 | AC_LANG_RESTORE
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| 57 | ])
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| 58 | case ".$VAR" in
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| 59 | .ok|.ok,*) m4_ifvaln($3,$3) ;;
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| 60 | .|.no|.no,*) m4_ifvaln($4,$4) ;;
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| 61 | *) m4_ifvaln($3,$3,[
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| 62 | if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
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| 63 | then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
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| 64 | else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
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| 65 | m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
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| 66 | fi ]) ;;
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| 67 | esac
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| 68 | AS_VAR_POPDEF([VAR])dnl
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| 69 | AS_VAR_POPDEF([FLAGS])dnl
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| 70 | ])
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| 71 |
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| 72 |
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| 73 | dnl -------------------------------------------------------------------------
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| 74 |
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| 75 | AC_DEFUN([AX_CFLAGS_GCC_OPTION_NEW], [dnl
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| 76 | AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
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| 77 | AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_gcc_option_$1])dnl
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| 78 | AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
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| 79 | VAR,[VAR="no, unknown"
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| 80 | AC_LANG_SAVE
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| 81 | AC_LANG_C
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| 82 | ac_save_[]FLAGS="$[]FLAGS"
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| 83 | for ac_arg dnl
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| 84 | in "-pedantic % m4_ifval($1,$1,-option)" dnl GCC
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| 85 | #
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| 86 | do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
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| 87 | AC_TRY_COMPILE([],[return 0;],
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| 88 | [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
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| 89 | done
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| 90 | FLAGS="$ac_save_[]FLAGS"
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| 91 | AC_LANG_RESTORE
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| 92 | ])
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| 93 | case ".$VAR" in
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| 94 | .ok|.ok,*) m4_ifvaln($3,$3) ;;
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| 95 | .|.no|.no,*) m4_ifvaln($4,$4) ;;
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| 96 | *) m4_ifvaln($3,$3,[
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| 97 | if echo " $[]m4_ifval($2,$2,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
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| 98 | then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain $VAR])
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| 99 | else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"])
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| 100 | m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"
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| 101 | fi ]) ;;
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| 102 | esac
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| 103 | AS_VAR_POPDEF([VAR])dnl
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| 104 | AS_VAR_POPDEF([FLAGS])dnl
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| 105 | ])
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| 106 |
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| 107 |
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| 108 | AC_DEFUN([AX_CFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
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| 109 | [AX_CFLAGS_GCC_OPTION_NEW($@)],[AX_CFLAGS_GCC_OPTION_OLD($@)])])
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