GCC 7.1.0 complains about an intended fallthrough. “__attribute__ ((fallthrough))” in this part of code would suppress this warning. Because older GCC compiler don’t understand this statement attribute and because there is already a comment in the source containing “falls?[ \t-]*thr(ough|u)” we can suppress the warning with the “-Wimplicit-fallthrough=2” warning option. Unintended fallthroughs without a comment would trigger this warning again.
To avoid compiler recognition in the Makefile a simply change of the comment is sufficient to suppress the warning. For some reason only stand alone comments mentioned in [1] are recognized so the comment has to be split up into two parts.
[1] https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gcc/Warning-Options.html#index-Wimp...
Signed-off-by: Philipp Psurek philipp.psurek@gmail.com --- tp_meter.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tp_meter.c b/tp_meter.c index 918fb79..bd7fdb4 100644 --- a/tp_meter.c +++ b/tp_meter.c @@ -500,7 +500,7 @@ int tp_meter(char *mesh_iface, int argc, char **argv) break; case BATADV_TP_REASON_CANCEL: printf("CANCEL received: test aborted\n"); - /* fall through and print the partial result */ + /* fallthrough *//* and print the partial result */ case BATADV_TP_REASON_COMPLETE: if (result.test_time > 0) { throughput = result.total_bytes * 1000;