stable-rc: 5.10: riscv: defconfig: clang-nightly: build failed - Invalid or unknown z ISA extension: 'zifencei'

[Conor Dooley]

On Tue, Feb 21, 2023 at 02:30:17PM +0530, Naresh Kamboju wrote:
> The riscv defconfig and tinyconfig builds failed with clang-nightly
> due to below build warnings / errors on latest stable-rc 5.10.
> 
> Regression on riscv:
>   - build/clang-nightly-tinyconfig - FAILED
>   - build/clang-nightly-defconfig - FAILED

> Build log:
> ----
> make --silent --keep-going --jobs=8
> O=/home/tuxbuild/.cache/tuxmake/builds/1/build ARCH=riscv
> CROSS_COMPILE=riscv64-linux-gnu- HOSTCC=clang CC=clang LLVM=1
> LLVM_IAS=1 LD=riscv64-linux-gnu-ld
> riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_zicsr2p0_zifencei2p0:
> Invalid or unknown z ISA extension: 'zifencei'
> riscv64-linux-gnu-ld: failed to merge target specific data of file
> init/version.o
> riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_zicsr2p0_zifencei2p0:
> Invalid or unknown z ISA extension: 'zifencei'
> riscv64-linux-gnu-ld: failed to merge target specific data of file
> init/do_mounts.o
> riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_zicsr2p0_zifencei2p0:
> Invalid or unknown z ISA extension: 'zifencei'
> riscv64-linux-gnu-ld: failed to merge target specific data of file
> init/noinitramfs.o
> riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_zicsr2p0_zifencei2p0:
> Invalid or unknown z ISA extension: 'zifencei'
> riscv64-linux-gnu-ld: failed to merge target specific data of file
> init/calibrate.o
> riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_zicsr2p0_zifencei2p0:
> Invalid or unknown z ISA extension: 'zifencei'

> Build details,
> https://qa-reports.linaro.org/lkft/linux-stable-rc-linux-5.10.y/build/v5.10.168-58-g7d11e4c4fc56/testrun/14869376/suite/build/test/clang-nightly-tinyconfig/details/

binutils 2.35 by the looks of things, I **think** that zifencei didn't
land until 2.36. zicsr and zifence get added via cc-option-yn, which,
IIRC, doesn't do anything with the linker. I dunno if anyone in RISC-V
land cares this much about "odd" configurations back in 5.10, but while
a fix is outstanding, you could use a newer binutils?
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