iiod: Print error message when more parameters are needed

If the network support has been disabled, we must have extra parameters
to be able to use either the USB frontend, or the UART frontend. If no
extra parameters corresponding to those frontends are passed, exit with
an error message.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>

iiod/iiod.c

@@ -289,6 +289,13 @@ static int start_iiod(const char *uri, const char *ffs_mountpoint,
 		 LIBIIO_VERSION_MAJOR, LIBIIO_VERSION_MINOR,
 		 LIBIIO_VERSION_GIT);
 
+	if (!WITH_IIOD_NETWORK
+	    && (!WITH_IIOD_USBD || !ffs_mountpoint)
+	    && (!WITH_IIOD_SERIAL || !uart_params)) {
+		IIO_ERROR("Not enough parameters given.\n");
+		return EXIT_FAILURE;
+	}
+
 	ctx = iio_create_context(&iiod_params, uri);
 	if (iio_err(ctx)) {
 		IIO_PERROR(iio_err(ctx), "Unable to create local context");