[PATCH 1/3] RISC-V: build: Pass `-mattr` to `lld`
Wende Tan
twd2.me at gmail.com
Mon Jul 19 13:52:47 PDT 2021
Pass `-mattr` to `lld` so that it can generate proper machine code.
By the way, it seems that `-march` does not work well now.
Signed-off-by: Wende Tan <twd2.me at gmail.com>
---
arch/riscv/Makefile | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index bc74afdbf31e..bbc186a3ab45 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -52,9 +52,16 @@ riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima
riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima
riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd
riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c
+riscv-mattr-y := +m,+a
+riscv-mattr-$(CONFIG_FPU) := $(riscv-mattr-y),+f,+d
+riscv-mattr-$(CONFIG_RISCV_ISA_C) := $(riscv-mattr-y),+c
KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
KBUILD_AFLAGS += -march=$(riscv-march-y)
+ifeq ($(CONFIG_LD_IS_LLD),y)
+ KBUILD_LDFLAGS += -mllvm -mattr=$(riscv-mattr-y)
+endif
+
KBUILD_CFLAGS += -mno-save-restore
KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
--
2.25.1
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