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                 result=no
  12                 if test x$withval = xoptional; then
  13                     AC_DEFINE(SUBSHELL_OPTIONAL, 1,  [Define to make subshell support optional])
  14                     result="optional"
  15                 fi
  16                 if test x$withval = xyes; then
  17                     result="yes"
  18                 fi
  19             ],
  20             [
  21                 dnl Default: enable the subshell support
  22                 result="yes"
  23             ])
  24
  25     if test "x$result" != xno; then
  26         AC_DEFINE(ENABLE_SUBSHELL, 1, [Define to enable subshell support])
  27
  28         dnl openpty() can simplify opening of master/slave devices for subshell
  29         AC_CHECK_HEADERS([pty.h libutil.h util.h])
  30         AC_CHECK_FUNCS(openpty,,
  31             AC_CHECK_LIB(util,openpty,
  32                 [AC_DEFINE(HAVE_OPENPTY)
  33                     LIBS="$LIBS -lutil"]
  34             )
  35         )
  36     fi
  37
  38     AC_MSG_RESULT([$result])
  39     subshell="$result"
  40
  41     AM_CONDITIONAL(ENABLE_SUBSHELL, [test "x$result" != xno])
  42 ])