gcc 12, RiscV64 fence.i instruction missing


Oliver Steffen
 

Hi,
has anyone tied building EDK2 (e.g. MdePkg) for RiscV64 with gcc 12?
I get:

/edk2/Build/Mde/DEBUG_GCC5/RISCV64/MdePkg/Library/BaseLib/BaseLib/OUTPUT/RiscV64/FlushCache.iiii:16: Error: unrecognized opcode `fence.i'

I found this gcc bug:
Bug 104853 - [RISC-V] -march=rv64g not including extension Zifencei
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104853

I was working on getting gcc 12 into the CI.

Thanks,
Oliver

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