linux-kernel - [PATCH] riscv: Pass -mno-relax only on lld

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Message-Id: <20220710071117.446112-1-maskray@google.com>
Date:   Sun, 10 Jul 2022 00:11:17 -0700
From:   Fangrui Song <maskray@...gle.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv@...ts.infradead.org
Cc:     Khem Raj <raj.khem@...il.com>, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Fangrui Song <maskray@...gle.com>
Subject: [PATCH] riscv: Pass -mno-relax only on lld < 15.0.0

lld since
https://github.com/llvm/llvm-project/commit/6611d58f5bbcbec77262d392e2923e1d680f6985
(milestone: 15.0.0) has implemented some RISC-V linker relaxation.
-mno-relax is no longer needed in KBUILD_CFLAGS/KBUILD_AFLAGS to
suppress R_RISCV_ALIGN which older lld can not handle:

ld.lld: error: capability.c:(.fixup+0x0): relocation R_RISCV_ALIGN requires unimplemented linker relaxation; recompile with -mno-relax but the .o is already compiled with -mno-relax

Signed-off-by: Fangrui Song <maskray@...gle.com>
---
 arch/riscv/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index 34cf8a598617..7e4ceb2a0981 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -37,6 +37,7 @@ else
 endif
 
 ifeq ($(CONFIG_LD_IS_LLD),y)
+ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 150000; echo $$?),0)
 	KBUILD_CFLAGS += -mno-relax
 	KBUILD_AFLAGS += -mno-relax
 ifndef CONFIG_AS_IS_LLVM
@@ -44,6 +45,7 @@ ifndef CONFIG_AS_IS_LLVM
 	KBUILD_AFLAGS += -Wa,-mno-relax
 endif
 endif
+endif
 
 # ISA string setting
 riscv-march-$(CONFIG_ARCH_RV32I)	:= rv32ima
-- 
2.37.0.144.g8ac04bfd2-goog