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    Subject[PATCH 4.14 020/210] Makefile.extrawarn: Move -Wcast-function-type-strict to W=1
    Date
    From: Sami Tolvanen <samitolvanen@google.com>

    commit 2120635108b35ecad9c59c8b44f6cbdf4f98214e upstream.

    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>
    Signed-off-by: Kees Cook <keescook@chromium.org>
    Link: https://lore.kernel.org/r/20220930203310.4010564-1-samitolvanen@google.com
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    scripts/Makefile.extrawarn | 1 +
    1 file changed, 1 insertion(+)

    --- a/scripts/Makefile.extrawarn
    +++ b/scripts/Makefile.extrawarn
    @@ -74,5 +74,6 @@ KBUILD_CFLAGS += $(call cc-disable-warni
    KBUILD_CFLAGS += $(call cc-disable-warning, uninitialized)
    KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast)
    KBUILD_CFLAGS += $(call cc-disable-warning, unaligned-access)
    +KBUILD_CFLAGS += $(call cc-disable-warning, cast-function-type-strict)
    endif
    endif

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