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

[Heinrich Schuchardt]

Public bug reported:

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)

** Affects: llvm-toolchain-17 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug foundations-todo mantic riscv64

** Tags added: foundations-todo

** Description changed:

- On riscv64 mantic 'gcc-13 -dumpspecs' returns
+ 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"
-  }
+  {
+    "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)

** Summary changed:

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

-- 
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https://bugs.launchpad.net/bugs/2040158

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

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

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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