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Message-Id: <20230717-enable-kasan-lto1-v1-1-471e706a5c4e@gmail.com>
Date: Mon, 17 Jul 2023 22:09:27 +0200
From: Jakob Koschel <jkl820.git@...il.com>
To: Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Tom Rix <trix@...hat.com>
Cc: linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
Jakob Koschel <jkl820.git@...il.com>
Subject: [PATCH] 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.
Signed-off-by: Jakob Koschel <jkl820.git@...il.com>
Link: https://github.com/llvm/llvm-project/commit/913f7e93dac67ecff47bade862ba42f27cb68ca9
Link: https://github.com/llvm/llvm-project/commit/4a8b1249306ff11f229320abdeadf0c215a00400
---
arch/Kconfig | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/Kconfig b/arch/Kconfig
index aff2746c8af2..61263ff92271 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -745,7 +745,8 @@ 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
+ 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
---
base-commit: fdf0eaf11452d72945af31804e2a1048ee1b574c
change-id: 20230717-enable-kasan-lto1-656754c76241
Best regards,
--
Jakob Koschel <jkl820.git@...il.com>
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