From: Sami Tolvanen <samitolvanen@google.com>
To: Masahiro Yamada <masahiroy@kernel.org>,
Michal Marek <michal.lkml@markovi.net>
Cc: Nick Desaulniers <ndesaulniers@google.com>,
Nathan Chancellor <nathan@kernel.org>, Tom Rix <trix@redhat.com>,
linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
llvm@lists.linux.dev, Kees Cook <keescook@chromium.org>,
Sami Tolvanen <samitolvanen@google.com>,
stable@vger.kernel.org
Subject: [PATCH] Makefile.extrawarn: Move -Wcast-function-type-strict to W=1
Date: Fri, 30 Sep 2022 20:33:10 +0000 [thread overview]
Message-ID: <20220930203310.4010564-1-samitolvanen@google.com> (raw)
We enable -Wcast-function-type globally in the kernel to warn about
mismatching types in function pointer casts. Compilers currently
warn only about ABI incompability with this flag, but Clang 16 will
enable a stricter version of the check by default that checks for an
exact type match. This will be very noisy in the kernel, so disable
-Wcast-function-type-strict without W=1 until the new warnings have
been addressed.
Cc: stable@vger.kernel.org
Link: https://reviews.llvm.org/D134831
Link: https://github.com/ClangBuiltLinux/linux/issues/1724
Suggested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
---
| 1 +
1 file changed, 1 insertion(+)
--git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
index 6ae482158bc4..52bd7df84fd6 100644
--- a/scripts/Makefile.extrawarn
+++ b/scripts/Makefile.extrawarn
@@ -64,6 +64,7 @@ KBUILD_CFLAGS += -Wno-sign-compare
KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast)
KBUILD_CFLAGS += -Wno-tautological-constant-out-of-range-compare
KBUILD_CFLAGS += $(call cc-disable-warning, unaligned-access)
+KBUILD_CFLAGS += $(call cc-disable-warning, cast-function-type-strict)
endif
endif
base-commit: 7bc6e90d7aa4170039abe80b9f4e8c8e4eb35091
--
2.38.0.rc1.362.ged0d419d3c-goog
next reply other threads:[~2022-09-30 20:33 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-30 20:33 Sami Tolvanen [this message]
2022-10-01 14:48 ` [PATCH] Makefile.extrawarn: Move -Wcast-function-type-strict to W=1 Kees Cook
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