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From: Lecopzer Chen <lecopzer.chen@mediatek.com>
To: <ndesaulniers@google.com>, <keescook@chromium.org>,
	<samitolvanen@google.com>, <linux-kbuild@vger.kernel.org>,
	<nathan@kernel.org>
Cc: <clang-built-linux@googlegroups.com>,
	<linux-kernel@vger.kernel.org>, <yj.chiang@mediatek.com>,
	<masahiroy@kernel.org>, <michal.lkml@markovi.net>,
	Lecopzer Chen <lecopzer.chen@mediatek.com>
Subject: [PATCH v3 2/2] Kbuild: lto: add make version checking
Date: Fri, 2 Jul 2021 11:29:43 +0800	[thread overview]
Message-ID: <20210702032943.7865-3-lecopzer.chen@mediatek.com> (raw)
In-Reply-To: <20210702032943.7865-1-lecopzer.chen@mediatek.com>

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@mediatek.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


  parent reply	other threads:[~2021-07-02  3:29 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-02  3:29 [PATCH v3 0/2] Kbuild: lto: add make version checking for MODVERSIONS Lecopzer Chen
2021-07-02  3:29 ` [PATCH v3 1/2] Kbuild: lto: add CONFIG_MAKE_VERSION Lecopzer Chen
2021-07-04  0:15   ` Nathan Chancellor
2021-07-05  2:02   ` Masahiro Yamada
2021-07-05 17:59     ` Sami Tolvanen
2021-07-06  9:06       ` Lecopzer Chen
2021-07-07 17:02         ` Sami Tolvanen
2021-07-09  8:25           ` Lecopzer Chen
2021-07-02  3:29 ` Lecopzer Chen [this message]
2021-07-04  0:16   ` [PATCH v3 2/2] Kbuild: lto: add make version checking Nathan Chancellor
2021-07-05  2:04   ` Masahiro Yamada

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