From 349fde599db65d4827820ef6553e3f9ee75b8c7c Mon Sep 17 00:00:00 2001 From: Jakob Koschel Date: Wed, 19 Jul 2023 00:29:12 +0200 Subject: arch: enable HAS_LTO_CLANG with KASAN and KCOV 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: https://github.com/llvm/llvm-project/commit/913f7e93dac67ecff47bade862ba42f27cb68ca9 Link: https://github.com/llvm/llvm-project/commit/4a8b1249306ff11f229320abdeadf0c215a00400 Link: https://lkml.kernel.org/r/20230717-enable-kasan-lto1-v3-1-650e1efc19d1@gmail.com Reviewed-by: Nathan Chancellor Signed-off-by: Jakob Koschel Reviewed-by: Nick Desaulniers Cc: Kees Cook Cc: Nathan Chancellor Cc: Tom Rix Signed-off-by: Andrew Morton --- arch/Kconfig | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'arch/Kconfig') diff --git a/arch/Kconfig b/arch/Kconfig index b2872e9d3760..94050a3f094e 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -732,7 +732,9 @@ config HAS_LTO_CLANG depends on $(success,$(AR) --help | head -n 1 | grep -qi llvm) depends on ARCH_SUPPORTS_LTO_CLANG 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 help The compiler and Kconfig options support building with Clang's -- cgit v1.2.3