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dnl ----------------------------------------------------------------------

dnl This whole bit snagged from libstdc++-v3.

dnl

dnl GCC_ENABLE

dnl    (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)

dnl    (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)

dnl    (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)

dnl

dnl See docs/html/17_intro/configury.html#enable for documentation.

dnl

AC_DEFUN([GCC_ENABLE],[dnl

m4_define([_g_switch],[--enable-$1])dnl

m4_define([_g_help],[AC_HELP_STRING(_g_switch$3,[$4 @<:@default=$2@:>@])])dnl

 AC_ARG_ENABLE($1,_g_help,

  m4_bmatch([$5],

   [^permit ],

     [[

      case "$enableval" in

       m4_bpatsubst([$5],[permit ])) ;;

       *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;

          dnl Idea for future:  generate a URL pointing to

          dnl "onlinedocs/configopts.html#whatever"

      esac

     ]],

   [^$],

     [[

      case "$enableval" in

       yes|no) ;;

       *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;

      esac

     ]],

   [[$5]]),

  [enable_]m4_bpatsubst([$1],-,_)[=][$2])

m4_undefine([_g_switch])dnl

m4_undefine([_g_help])dnl

])