[Bug 2040158] Re: RISC-V: clang-17 does not enable target-feature zifencei

[Heinrich Schuchardt]

The current upstream behavior is intended and documented in
https://github.com/llvm/llvm-
project/commit/d7b2003761a2280e8d01af173355060aad464c67 .

** Tags removed: foundations-todo

** Changed in: llvm-toolchain-17 (Ubuntu)
       Status: New => Invalid

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Title:
  RISC-V: clang-17 does not enable target-feature zifencei

Status in llvm-toolchain-17 package in Ubuntu:
  Invalid

Bug description:
  On riscv64 Ubuntu Mantic 'gcc-13 -dumpspecs' returns

  march=rv64imafdc_zicsr_zifencei mabi=lp64d

  'clang-17 -v foo.c' shows

  -target-feature -zifencei

  We should enable -target-feature +zifencei as default to match gcc.

  The FENCE.I instruction is used to clear the instruction cache.

  ProblemType: Bug
  DistroRelease: Ubuntu 23.10
  Package: clang-17 1:17.0.2-1~exp1ubuntu2.1
  ProcVersionSignature: Ubuntu 6.5.0-9.9.1-generic 6.5.3
  Uname: Linux 6.5.0-9-generic riscv64
  ApportVersion: 2.27.0-0ubuntu5
  Architecture: riscv64
  CasperMD5json:
   {
     "result": "skip"
   }
  CloudArchitecture: riscv64
  CloudID: none
  CloudName: none
  CloudPlatform: none
  CloudSubPlatform: config
  Date: Mon Oct 23 11:13:34 2023
  InstallationDate: Installed on 2023-10-19 (4 days ago)
  InstallationMedia: Ubuntu-Server 23.10 "Mantic Minotaur" - Release riscv64 (20231011)
  SourcePackage: llvm-toolchain-17
  UpgradeStatus: No upgrade log present (probably fresh install)

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