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arch: enable HAS_LTO_CLANG with KASAN and KCOV

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Both KASAN and KCOV had issues with LTO_CLANG if DEBUG_INFO is enabled. 
With LTO inlinable function calls are required to have debug info if they
are inlined into a function that has debug info.

Starting with LLVM 17 this will be fixed ([1],[2]) and enabling LTO with
KASAN/KCOV and DEBUG_INFO doesn't cause linker errors anymore.

Link: 913f7e93da
Link: 4a8b124930
Link: https://lkml.kernel.org/r/20230717-enable-kasan-lto1-v3-1-650e1efc19d1@gmail.com
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Jakob Koschel <jkl820.git@gmail.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Tom Rix <trix@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jakob Koschel
2023-07-19 00:29:12 +02:00
committed by Andrew Morton
parent d9efb07dcb
commit 349fde599d
1 changed files with 3 additions and 1 deletions
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4
arch/Kconfig
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@@ -732,7 +732,9 @@ config HAS_LTO_CLANG
depends on $(success,$(AR) --help | head -n 1 | grep -qi llvm) depends on $(success,$(AR) --help | head -n 1 | grep -qi llvm)
depends on ARCH_SUPPORTS_LTO_CLANG depends on ARCH_SUPPORTS_LTO_CLANG
depends on !FTRACE_MCOUNT_USE_RECORDMCOUNT depends on !FTRACE_MCOUNT_USE_RECORDMCOUNT
depends on !KASAN || KASAN_HW_TAGS # https://github.com/ClangBuiltLinux/linux/issues/1721
depends on (!KASAN || KASAN_HW_TAGS || CLANG_VERSION >= 170000) || !DEBUG_INFO
depends on (!KCOV || CLANG_VERSION >= 170000) || !DEBUG_INFO
depends on !GCOV_KERNEL depends on !GCOV_KERNEL
help help
The compiler and Kconfig options support building with Clang's The compiler and Kconfig options support building with Clang's