From: "Gustavo A. R. Silva" <gustavoars@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nathan Chancellor <nathan@kernel.org>,
linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavoars@kernel.org>,
linux-hardening@vger.kernel.org, linux-kbuild@vger.kernel.org
Subject: [PATCH v3] kbuild: Fix -Wimplicit-fallthrough=5 error for GCC 5.x and 6.x
Date: Sun, 14 Nov 2021 20:48:44 -0600 [thread overview]
Message-ID: <20211115024844.GA68591@embeddedor> (raw)
-Wimplicit-fallthrough=5 was under cc-option because it was only
available in GCC 7.x and newer so the build is now broken for GCC 5.x
and 6.x:
gcc: error: unrecognized command line option '-Wimplicit-fallthrough=5';
did you mean '-Wno-fallthrough'?
Fix this by moving -Wimplicit-fallthrough=5 under cc-option.
Fixes: dee2b702bcf0 ("kconfig: Add support for -Wimplicit-fallthrough")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Co-developed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
Changes in v3:
- Keep the original CC_IS_GCC part of the test[1].
Link: https://lore.kernel.org/linux-hardening/CAHk-=whaJCEwqKbekSNjziY4RMTKzkRkkrOM4MEZQEo0j3HT=Q@mail.gmail.com/ [1]
Changes in v2:
- Add Fixes tag.
init/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/init/Kconfig b/init/Kconfig
index 036b750e8d8a..4b7bac10c72d 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -887,7 +887,7 @@ config CC_HAS_INT128
config CC_IMPLICIT_FALLTHROUGH
string
- default "-Wimplicit-fallthrough=5" if CC_IS_GCC
+ default "-Wimplicit-fallthrough=5" if CC_IS_GCC && $(cc-option,-Wimplicit-fallthrough=5)
default "-Wimplicit-fallthrough" if CC_IS_CLANG && $(cc-option,-Wunreachable-code-fallthrough)
#
--
2.27.0
reply other threads:[~2021-11-15 2:44 UTC|newest]
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