[PATCH] Makefile: fix build with binutils 2.38
Bin Meng
bmeng.cn at gmail.com
Fri Jan 28 07:32:47 PST 2022
On Thu, Jan 27, 2022 at 7:45 AM Aurelien Jarno <aurelien at aurel32.net> wrote:
>
> 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 explicitely in -march. However as
typo: explicitly
> older binutils version do not support this, we first need to detect
> that.
>
> Signed-off-by: Aurelien Jarno <aurelien at aurel32.net>
> ---
> Makefile | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/Makefile b/Makefile
> index 062883e..0a79eb9 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -153,6 +153,9 @@ OPENSBI_LD_PIE := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) $(USE_LD_FLAG) -fP
> # Check whether the compiler supports -m(no-)save-restore
> CC_SUPPORT_SAVE_RESTORE := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) -nostdlib -mno-save-restore -x c /dev/null -o /dev/null 2>&1 | grep "\-save\-restore" >/dev/null && echo n || echo y)
>
> +# Check whether the assembler and the compiler support the Zicsr and Zifencei extensions
> +CC_SUPPORT_SICSR_ZIFENCEI := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) $(USE_LD_FLAG) -march=rv$(PLATFORM_RISCV_XLEN)imafd_zicsr_zifencei -nostdlib -x c /dev/null -o /dev/null >/dev/null 2>&1 && echo 1 || echo 0)
should be ZICSR
please make the command in consistent with CC_SUPPORT_SAVE_RESTORE
> +
> # Build Info:
> # OPENSBI_BUILD_TIME_STAMP -- the compilation time stamp
> # OPENSBI_BUILD_COMPILER_VERSION -- the compiler version info
> @@ -223,7 +226,11 @@ ifndef PLATFORM_RISCV_ABI
> endif
> ifndef PLATFORM_RISCV_ISA
> ifneq ($(PLATFORM_RISCV_TOOLCHAIN_DEFAULT), 1)
> - PLATFORM_RISCV_ISA = rv$(PLATFORM_RISCV_XLEN)imafdc
> + ifeq ($(CC_SUPPORT_SICSR_ZIFENCEI), 1)
> + PLATFORM_RISCV_ISA = rv$(PLATFORM_RISCV_XLEN)imafdc_zicsr_zifencei
> + else
> + PLATFORM_RISCV_ISA = rv$(PLATFORM_RISCV_XLEN)imafdc
> + endif
> else
> PLATFORM_RISCV_ISA = $(OPENSBI_CC_ISA)
> endif
> --
>
Regards,
Bin
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