uhd: Add UHD_FALLTHROUGH attribute

This provides a platform-independent attribute to allow fallthroughs in
switch statements. Example:

switch (foo) {
    case BAR:
        do_something();
	UHD_FALLTHROUGH
    case BAZ:
        do_another_thing();
}

The usage of UHD_FALLTHROUGH will avoid a compiler warning if indeed the
fallthrough was intentional. The associated warning
(-Wimplicit-fallthrough) is only available on gcc and Clang.

1 files changed, 1 insertions, 0 deletions

diff --git a/host/lib/usrp/usrp1/soft_time_ctrl.cpp b/host/lib/usrp/usrp1/soft_time_ctrl.cpp
index 851f0f507..7f39caf8a 100644
--- a/host/lib/usrp/usrp1/soft_time_ctrl.cpp
+++ b/host/lib/usrp/usrp1/soft_time_ctrl.cpp
@@ -102,6 +102,7 @@ public:
             metadata.error_code = rx_metadata_t::ERROR_CODE_BROKEN_CHAIN;
             _inline_msg_queue.push_with_pop_on_full(metadata);
         } //continue to next case...
+        UHD_FALLTHROUGH
         case stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE:
             md.end_of_burst = true;
             this->issue_stream_cmd(stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS);