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kconfig: Add support for -Wimplicit-fallthrough
Add Kconfig support for -Wimplicit-fallthrough for both GCC and Clang. The compiler option is under configuration CC_IMPLICIT_FALLTHROUGH, which is enabled by default. Special thanks to Nathan Chancellor who fixed the Clang bug[1][2]. This bugfix only appears in Clang 14.0.0, so older versions still contain the bug and -Wimplicit-fallthrough won't be enabled for them, for now. This concludes a long journey and now we are finally getting rid of the unintentional fallthrough bug-class in the kernel, entirely. :) Link: llvm/llvm-project@9ed4a94 [1] Link: https://bugs.llvm.org/show_bug.cgi?id=51094 [2] Link: KSPP#115 Link: ClangBuiltLinux#236 Co-developed-by: Kees Cook <[email protected]> Signed-off-by: Kees Cook <[email protected]> Co-developed-by: Linus Torvalds <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Signed-off-by: Gustavo A. R. Silva <[email protected]> Reviewed-by: Nathan Chancellor <[email protected]> Tested-by: Nathan Chancellor <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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