[clang] [Driver][KCFI] Forward -fsanitize-kcfi-hash= to cc1 (PR #214827)

Fri Aug 7 18:53:39 PDT 2026

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-aarch64-darwin` running on `doug-worker-5` while building `clang` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/190/builds/47421

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'Clang :: Driver/fsanitize-cfi.c' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
/Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang --target=x86_64-linux-gnu -fvisibility=hidden -fsanitize=cfi -flto -resource-dir=/Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/Inputs/resource_dir -c /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c -### 2>&1 | /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c --check-prefix=CHECK-CFI
# executed command: /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang --target=x86_64-linux-gnu -fvisibility=hidden -fsanitize=cfi -flto -resource-dir=/Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/Inputs/resource_dir -c /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c '-###'
# note: command had no output on stdout or stderr
# executed command: /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c --check-prefix=CHECK-CFI
# note: command had no output on stdout or stderr
# RUN: at line 2
/Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang --target=x86_64-apple-darwin10 -fvisibility=hidden -fsanitize=cfi -flto -resource-dir=/Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/Inputs/resource_dir -c /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c -### 2>&1 | /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c --check-prefix=CHECK-CFI
# executed command: /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang --target=x86_64-apple-darwin10 -fvisibility=hidden -fsanitize=cfi -flto -resource-dir=/Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/Inputs/resource_dir -c /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c '-###'
# note: command had no output on stdout or stderr
# executed command: /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c --check-prefix=CHECK-CFI
# note: command had no output on stdout or stderr
# RUN: at line 3
/Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang --target=x86_64-pc-win32 -fvisibility=hidden -fsanitize=cfi -flto -resource-dir=/Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/Inputs/resource_dir -c /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c -### 2>&1 | /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c --check-prefix=CHECK-CFI-NOMFCALL
# executed command: /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang --target=x86_64-pc-win32 -fvisibility=hidden -fsanitize=cfi -flto -resource-dir=/Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/Inputs/resource_dir -c /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c '-###'
# note: command had no output on stdout or stderr
# executed command: /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c --check-prefix=CHECK-CFI-NOMFCALL
# note: command had no output on stdout or stderr
# RUN: at line 4
/Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang --target=x86_64-linux-gnu -fvisibility=hidden -fsanitize=cfi -fsanitize-cfi-cross-dso -flto -resource-dir=/Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/Inputs/resource_dir -c /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c -### 2>&1 | /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c --check-prefix=CHECK-CFI-NOMFCALL
# executed command: /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang --target=x86_64-linux-gnu -fvisibility=hidden -fsanitize=cfi -fsanitize-cfi-cross-dso -flto -resource-dir=/Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/Inputs/resource_dir -c /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c '-###'
# note: command had no output on stdout or stderr
# executed command: /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c --check-prefix=CHECK-CFI-NOMFCALL
# note: command had no output on stdout or stderr
# RUN: at line 5
/Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang --target=x86_64-linux-gnu -fvisibility=hidden -fsanitize=cfi-derived-cast -flto -resource-dir=/Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/Inputs/resource_dir -c /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c -### 2>&1 | /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c --check-prefix=CHECK-CFI-DCAST
# executed command: /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang --target=x86_64-linux-gnu -fvisibility=hidden -fsanitize=cfi-derived-cast -flto -resource-dir=/Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/Inputs/resource_dir -c /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c '-###'
# note: command had no output on stdout or stderr
# executed command: /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c --check-prefix=CHECK-CFI-DCAST
# note: command had no output on stdout or stderr
# RUN: at line 6
/Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang --target=x86_64-linux-gnu -fvisibility=hidden -fsanitize=cfi-unrelated-cast -flto -resource-dir=/Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/Inputs/resource_dir -c /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c -### 2>&1 | /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c --check-prefix=CHECK-CFI-UCAST
# executed command: /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang --target=x86_64-linux-gnu -fvisibility=hidden -fsanitize=cfi-unrelated-cast -flto -resource-dir=/Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/Inputs/resource_dir -c /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c '-###'
# note: command had no output on stdout or stderr
# executed command: /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c --check-prefix=CHECK-CFI-UCAST
# note: command had no output on stdout or stderr
# RUN: at line 7
/Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang --target=x86_64-linux-gnu -flto -fvisibility=hidden -fsanitize=cfi-nvcall -resource-dir=/Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/Inputs/resource_dir -c /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c -### 2>&1 | /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c --check-prefix=CHECK-CFI-NVCALL
# executed command: /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang --target=x86_64-linux-gnu -flto -fvisibility=hidden -fsanitize=cfi-nvcall -resource-dir=/Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/Inputs/resource_dir -c /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c '-###'
# note: command had no output on stdout or stderr
# executed command: /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c --check-prefix=CHECK-CFI-NVCALL
# note: command had no output on stdout or stderr
# RUN: at line 8
/Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang --target=x86_64-linux-gnu -flto -fvisibility=hidden -fsanitize=cfi-vcall -resource-dir=/Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/Inputs/resource_dir -c /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c -### 2>&1 | /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c --check-prefix=CHECK-CFI-VCALL
# executed command: /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang --target=x86_64-linux-gnu -flto -fvisibility=hidden -fsanitize=cfi-vcall -resource-dir=/Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/Inputs/resource_dir -c /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Driver/fsanitize-cfi.c '-###'
...

```

</details>

https://github.com/llvm/llvm-project/pull/214827