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Makefile: fix build with binutils 2.38

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From version 2.38, binutils default to ISA spec version 20191213. This
means that the csr read/write (csrr*/csrw*) instructions and fence.i
instruction has separated from the `I` extension, become two standalone
extensions: Zicsr and Zifencei. As the kernel uses those instruction,
this causes the following build failure:

 CC        lib/sbi/sbi_tlb.o
<<BUILDDIR>>/lib/sbi/sbi_tlb.c: Assembler messages:
<<BUILDDIR>>/lib/sbi/sbi_tlb.c:190: Error: unrecognized opcode `fence.i'
make: *** [Makefile:431: <<BUILDDIR>>/build/lib/sbi/sbi_tlb.o] Error 1

The fix is to specify those extensions explicitly in -march. However as
older binutils version do not support this, we first need to detect
that.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Alexandre Ghiti <alexandre.ghiti@canonical.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Aurelien Jarno
2022-01-28 18:33:46 +01:00
committed by Han Gao
parent d98da90a19
commit 0c27ac7f5d
1 changed files with 8 additions and 1 deletions
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9
Makefile
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@@ -106,6 +106,9 @@ ifndef PLATFORM_RISCV_XLEN
endif
endif
# Check whether the assembler and the compiler support the Zicsr and Zifencei extensions
CC_SUPPORT_ZICSR_ZIFENCEI := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) -nostdlib -march=rv$(OPENSBI_CC_XLEN)imafd_zicsr_zifencei -x c /dev/null -o /dev/null 2>&1 | grep "zicsr\|zifencei" > /dev/null && echo n || echo y)
# Setup list of objects.mk files
ifdef PLATFORM
platform-object-mks=$(shell if [ -d $(platform_src_dir)/ ]; then find $(platform_src_dir) -iname "objects.mk" | sort -r; fi)
@@ -157,7 +160,11 @@ ifndef PLATFORM_RISCV_ABI
endif
ifndef PLATFORM_RISCV_ISA
ifneq ($(PLATFORM_RISCV_TOOLCHAIN_DEFAULT), 1)
PLATFORM_RISCV_ISA = rv$(PLATFORM_RISCV_XLEN)imafdc
ifeq ($(CC_SUPPORT_ZICSR_ZIFENCEI), y)
PLATFORM_RISCV_ISA = rv$(PLATFORM_RISCV_XLEN)imafdc_zicsr_zifencei
else
PLATFORM_RISCV_ISA = rv$(PLATFORM_RISCV_XLEN)imafdc
endif
else
PLATFORM_RISCV_ISA = $(OPENSBI_CC_ISA)
endif