linux-kernel - [PATCH v3 2/2] Kbuild: lto: add make version checking

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Date:   Fri, 2 Jul 2021 11:29:43 +0800
From:   Lecopzer Chen <lecopzer.chen@...iatek.com>
To:     <ndesaulniers@...gle.com>, <keescook@...omium.org>,
        <samitolvanen@...gle.com>, <linux-kbuild@...r.kernel.org>,
        <nathan@...nel.org>
CC:     <clang-built-linux@...glegroups.com>,
        <linux-kernel@...r.kernel.org>, <yj.chiang@...iatek.com>,
        <masahiroy@...nel.org>, <michal.lkml@...kovi.net>,
        Lecopzer Chen <lecopzer.chen@...iatek.com>
Subject: [PATCH v3 2/2] Kbuild: lto: add make version checking

LTO with MODVERSIONS will fail in generating correct CRC because
the makefile rule doesn't work for make with version 3.8X.[1]

Thus we need to check make version during selecting on LTO Kconfig.
and the suitable version should be 4.2(40200) which released in 2016[2].

[1] https://lore.kernel.org/lkml/20210616080252.32046-1-lecopzer.chen@mediatek.com/
[2] https://ftp.gnu.org/gnu/make/
Signed-off-by: Lecopzer Chen <lecopzer.chen@...iatek.com>
---
 arch/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/Kconfig b/arch/Kconfig
index 129df498a8e1..beee68149da8 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -639,6 +639,7 @@ config HAS_LTO_CLANG
 	def_bool y
 	# Clang >= 11: https://github.com/ClangBuiltLinux/linux/issues/510
 	depends on CC_IS_CLANG && CLANG_VERSION >= 110000 && LD_IS_LLD && AS_IS_LLVM
+	depends on !MODVERSIONS || MAKE_VERSION >= 40200
 	depends on $(success,$(NM) --help | head -n 1 | grep -qi llvm)
 	depends on $(success,$(AR) --help | head -n 1 | grep -qi llvm)
 	depends on ARCH_SUPPORTS_LTO_CLANG
-- 
2.18.0