From 3a1127babd5fa52e9e2f34e949765c93e7e3f108 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Wed, 8 Feb 2017 17:01:46 -0300 Subject: tools include: Add a __fallthrough statement commit b5bf1733d6a391c4e90ea8f8468d83023be74a2a upstream. For cases where implicit fall through case labels are intended, to let us inform that to gcc >= 7: CC /tmp/build/perf/util/string.o util/string.c: In function 'perf_atoll': util/string.c:22:7: error: this statement may fall through [-Werror=implicit-fallthrough=] if (*p) ^ util/string.c:24:3: note: here case '\0': ^~~~ So we introduce: #define __fallthrough __attribute__ ((fallthrough)) And use it in such cases. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Cc: William Cohen Link: http://lkml.kernel.org/n/tip-qnpig0xfop4hwv6k4mv1wts5@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Ben Hutchings --- tools/include/linux/compiler.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'tools') diff --git a/tools/include/linux/compiler.h b/tools/include/linux/compiler.h index 88461f09cc86..e4643073e7db 100644 --- a/tools/include/linux/compiler.h +++ b/tools/include/linux/compiler.h @@ -37,4 +37,13 @@ #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) + +#ifndef __fallthrough +# if defined(__GNUC__) && __GNUC__ >= 7 +# define __fallthrough __attribute__ ((fallthrough)) +# else +# define __fallthrough +# endif +#endif + #endif /* _TOOLS_LINUX_COMPILER_H */ -- cgit v1.2.3