dnl $Id$

AC_DEFUN(RTEMS_CHECK_NEWLIB,
[dnl
AC_REQUIRE([RTEMS_PROG_CC_FOR_TARGET])dnl
AC_REQUIRE([RTEMS_CANONICALIZE_TOOLS])dnl
AC_CACHE_CHECK([for RTEMS newlib],
  rtems_cv_use_newlib,
  [
dnl some versions of newlib provide not_required_by_rtems
    AC_LINK_IFELSE(
      [AC_LANG_PROGRAM([[extern void not_required_by_rtems() ;]], 
        [[not_required_by_rtems()]])],
      [rtems_cv_use_newlib="yes"],[])

dnl some versions of newlib provide rtems_provides_crt0()
    AS_IF([test -z "$rtems_cv_use_newlib"],
      [AC_LINK_IFELSE(
         [AC_LANG_PROGRAM([[extern void rtems_provides_crt0() ;]],
           [[rtems_provides_crt0()]])],
         [rtems_cv_use_newlib="yes"],[rtems_cv_use_newlib="no"])
    ])
  ])
  RTEMS_USE_NEWLIB="$rtems_cv_use_newlib"
  AC_SUBST(RTEMS_USE_NEWLIB)

  AS_IF([test x"${RTEMS_USE_NEWLIB}" = x"yes"],
    [ AC_DEFINE_UNQUOTED(RTEMS_NEWLIB,1,[if using newlib])]
  )
])