linux-kernel - [PATCH] LoongArch: Fix build error for LTO with LLVM-18

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Message-ID: <20250923130122.2321771-1-chenhuacai@loongson.cn>
Date: Tue, 23 Sep 2025 21:01:22 +0800
From: Huacai Chen <chenhuacai@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: loongarch@...ts.linux.dev,
	Xuefeng Li <lixuefeng@...ngson.cn>,
	Guo Ren <guoren@...nel.org>,
	Xuerui Wang <kernel@...0n.name>,
	Jiaxun Yang <jiaxun.yang@...goat.com>,
	linux-kernel@...r.kernel.org,
	Huacai Chen <chenhuacai@...ngson.cn>,
	Nathan Chancellor <nathan@...nel.org>,
	WANG Rui <wangrui@...ngson.cn>
Subject: [PATCH] LoongArch: Fix build error for LTO with LLVM-18

Commit b15212824a01 ("LoongArch: Make LTO case independent in Makefile")
moves "KBUILD_LDFLAGS += -mllvm --loongarch-annotate-tablejump" out of
CONFIG_CC_HAS_ANNOTATE_TABLEJUMP, which breaks the build for LLVM-18, as
'--loongarch-annotate-tablejump' is unimplemented there:

ld.lld: error: -mllvm: ld.lld: Unknown command line argument '--loongarch-annotate-tablejump'.

Call ld-option to detect '--loongarch-annotate-tablejump' before use, so
as to fix the build error.

Fixes: b15212824a01 ("LoongArch: Make LTO case independent in Makefile")
Reported-by: Nathan Chancellor <nathan@...nel.org>
Suggested-by: WANG Rui <wangrui@...ngson.cn>
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
---
 arch/loongarch/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile
index ae419e32f22e..fcfa793f9bb0 100644
--- a/arch/loongarch/Makefile
+++ b/arch/loongarch/Makefile
@@ -115,7 +115,7 @@ ifdef CONFIG_LTO_CLANG
 # The annotate-tablejump option can not be passed to LLVM backend when LTO is enabled.
 # Ensure it is aware of linker with LTO, '--loongarch-annotate-tablejump' also needs to
 # be passed via '-mllvm' to ld.lld.
-KBUILD_LDFLAGS			+= -mllvm --loongarch-annotate-tablejump
+KBUILD_LDFLAGS			+= $(call ld-option,-mllvm --loongarch-annotate-tablejump)
 endif
 endif
 
-- 
2.47.3