llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder 
`ppc64le-lld-multistage-test` running on `ppc64le-lld-multistage-test` while 
building `clang` at step 13 "test-build-stage2-unified-tree-check-all".

Full details are available at: 
https://lab.llvm.org/buildbot/#/builders/168/builds/12688

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

```
Step 13 (test-build-stage2-unified-tree-check-all) failure: test (failure)
******************** TEST 'Clang :: SemaCXX/libstdcxx_common_type_hack.cpp' 
FAILED ********************
Exit Code: 1

Command Output (stderr):
--
/home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/build/stage2/bin/clang
 -cc1 -internal-isystem 
/home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/build/stage2/lib/clang/21/include
 -nostdsysteminc -fsyntax-only 
/home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/llvm-project/clang/test/SemaCXX/libstdcxx_common_type_hack.cpp
 -std=c++11 -verify -D__GLIBCXX__=20100000L # RUN: at line 1
+ 
/home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/build/stage2/bin/clang
 -cc1 -internal-isystem 
/home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/build/stage2/lib/clang/21/include
 -nostdsysteminc -fsyntax-only 
/home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/llvm-project/clang/test/SemaCXX/libstdcxx_common_type_hack.cpp
 -std=c++11 -verify -D__GLIBCXX__=20100000L
error: 'expected-error' diagnostics seen but not expected: 
  File 
/home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/llvm-project/clang/test/SemaCXX/libstdcxx_common_type_hack.cpp
 Line 28: type alias redefinition with different types ('std::common_type<int, 
int>::type' (aka 'int &&') vs 'int')
error: 'expected-note' diagnostics seen but not expected: 
  File 
/home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/llvm-project/clang/test/SemaCXX/libstdcxx_common_type_hack.cpp
 Line 27: previous definition is here
2 errors generated.

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/141977
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