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dnl
dnl JH_ADD_CFLAG(FLAG)
dnl checks whether the C compiler supports the given flag, and if so, adds
dnl it to $CFLAGS. If the flag is already present in the list, then the
dnl check is not performed.
AC_DEFUN([JH_ADD_CFLAG],
[
case " $CFLAGS " in
*@<:@\ \ @:>@$1@<:@\ \ @:>@*)
;;
*)
save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $1"
AC_MSG_CHECKING([whether [$]CC understands $1])
AC_TRY_COMPILE([], [], [jh_has_option=yes], [jh_has_option=no])
AC_MSG_RESULT($jh_has_option)
if test $jh_has_option = no; then
CFLAGS="$save_CFLAGS"
fi
;;
esac])
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