m4/warning.m4

   1 AC_DEFUN(BISON_WARNING,
   2 [AC_MSG_CHECKING(whether compiler accepts $1)
   3 AC_SUBST(WARNING_CFLAGS)
   4 ac_save_CFLAGS="$CFLAGS"
   5 CFLAGS="$CFLAGS $1"
   6 AC_TRY_COMPILE(,
   7 [int x;],
   8 WARNING_CFLAGS="$WARNING_CFLAGS $1"
   9 AC_MSG_RESULT(yes),
  10 AC_MSG_RESULT(no))
  11 CFLAGS="$ac_save_CFLAGS"])