gcc-7.1.1-1.fc27.x86_64
/home/jkratoch/redhat/fedora/libipt/master/processor-trace-1.6.1/libipt/src/pt_block_decoder.c: In function ‘pt_blk_proceed_no_event_cached’:
/home/jkratoch/redhat/fedora/libipt/master/processor-trace-1.6.1/libipt/src/pt_block_decoder.c:2282:6: error: this statement may fall through [-Werror=implicit-fallthrough=]
   if (bce.isize) {
      ^
/home/jkratoch/redhat/fedora/libipt/master/processor-trace-1.6.1/libipt/src/pt_block_decoder.c:2328:2: note: here
  case ptbq_decode: {
  ^~~~

--- processor-trace-1.6.1-orig/libipt/src/pt_block_decoder.c	2017-05-31 13:30:32.000000000 +0200
+++ processor-trace-1.6.1/libipt/src/pt_block_decoder.c	2017-06-09 07:24:12.644587611 +0200
@@ -2324,6 +2324,7 @@ static int pt_blk_proceed_no_event_cache
 		}
 
 		/* Fall through to ptbq_decode. */
+		__attribute__ ((fallthrough));
 
 	case ptbq_decode: {
 		struct pt_insn_ext iext;