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
])

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