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tools/nolibc: compiler: add macro __nolibc_fallthrough

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Recent version of GCC and clang gained -Wimplicit-fallthrough,
warning about implicit fall-through between switch labels.
As nolibc does not control the compilation flags, this can trigger
warnings for when built by the user.
Make use of the "fallthrough" attribute to explicitly annotate the
expected fall-throughs and silence the warning.

Link: https://lore.kernel.org/r/20240930-nolibc-fallthrough-v2-1-2e8d10fe3430@weissschuh.net
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
This commit is contained in:
Thomas Weißschuh 2024-09-30 07:35:19 +02:00
parent 711b587581
commit 079ec6a3cf
2 changed files with 8 additions and 1 deletions
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6
tools/include/nolibc/compiler.h
View File

@ -32,4 +32,10 @@
# define __no_stack_protector __attribute__((__optimize__("-fno-stack-protector")))
#endif /* __nolibc_has_attribute(no_stack_protector) */
#if __nolibc_has_attribute(fallthrough)
# define __nolibc_fallthrough do { } while (0); __attribute__((fallthrough))
#else
# define __nolibc_fallthrough do { } while (0)
#endif /* __nolibc_has_attribute(fallthrough) */
#endif /* _NOLIBC_COMPILER_H */

3
tools/include/nolibc/stdio.h
View File

@ -15,6 +15,7 @@
#include "stdarg.h"
#include "stdlib.h"
#include "string.h"
#include "compiler.h"
#ifndef EOF
#define EOF (-1)
@ -264,7 +265,7 @@ int vfprintf(FILE *stream, const char *fmt, va_list args)
case 'p':
*(out++) = '0';
*(out++) = 'x';
/* fall through */
__nolibc_fallthrough;
default: /* 'x' and 'p' above */
u64toh_r(v, out);
break;