m4.include/mc-subshell.m4

   1 dnl
   2 dnl Subshell support.
   3 dnl
   4 AC_DEFUN([mc_SUBSHELL], [
   5
   6     AC_MSG_CHECKING([for subshell support])
   7     AC_ARG_WITH(subshell,
   8             [  --with-subshell          Compile in concurrent subshell @<:@yes@:>@
   9   --with-subshell=optional Don't run concurrent shell by default @<:@no@:>@],
  10             [
  11                 case "x$withval" in
  12                     xyes)
  13                         result="yes"
  14                         ;;
  15                     xoptional)
  16                         result="optional"
  17                         ;;
  18                     *)
  19                         result="no"
  20                         ;;
  21                 esac
  22             ],
  23             [
  24                 dnl Default: enable the subshell support
  25                 result="yes"
  26             ])
  27
  28     AC_MSG_RESULT([$result])
  29
  30     if test "x$result" != xno; then
  31         AC_DEFINE(ENABLE_SUBSHELL, 1, [Define to enable subshell support])
  32
  33         dnl openpty() can simplify opening of master/slave devices for subshell
  34         AC_CHECK_HEADERS([pty.h libutil.h util.h])
  35         AC_CHECK_FUNCS(openpty,,
  36             AC_CHECK_LIB(util,openpty,
  37                 [AC_DEFINE(HAVE_OPENPTY)
  38                     LIBS="$LIBS -lutil"]
  39             )
  40         )
  41
  42         if test "x$result" = xoptional; then
  43             AC_DEFINE(SUBSHELL_OPTIONAL, 1, [Define to make subshell support optional])
  44         fi
  45     fi
  46
  47     subshell="$result"
  48
  49     AM_CONDITIONAL(ENABLE_SUBSHELL, [test "x$result" != xno])
  50 ])