feat(libc): add support for fallthrough statement
Modern C compilers warn about unannotated switch/case fallthrough code,
and require either a comment with some magic words, or an explicit
compiler attribute.
Since some TF-A static analysis CI check suggests having a "fallthrough;"
statement instead of a comment, introduce a macro that implements that
statement, and emits the proper compiler attribute.
Change-Id: Ib34e615fb48d0f4a340aabfad4472e08d5c70248
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/include/lib/libc/cdefs.h b/include/lib/libc/cdefs.h
index 423f0db..2423f38 100644
--- a/include/lib/libc/cdefs.h
+++ b/include/lib/libc/cdefs.h
@@ -15,6 +15,7 @@
#define __maybe_unused __attribute__((__unused__))
#define __aligned(x) __attribute__((__aligned__(x)))
#define __section(x) __attribute__((__section__(x)))
+#define __fallthrough __attribute__((__fallthrough__))
#if RECLAIM_INIT_CODE
/*
* Add each function to a section that is unique so the functions can still