MaskRay wrote:
> LLVM Buildbot has detected a new failure on builder
> `llvm-clang-x86_64-sie-ubuntu-fast` running on `sie-linux-worker` while
> building `clang` at step 6 "test-build-unified-tree-check-all".
>
> Full details are available at:
> [lab.llvm.org/buildbot#/builders/144/builds/33199](https://lab.llvm.org/buildbot/#/builders/144/builds/33199)
>
> Here is the relevant piece of the build log for the reference
```
******************** TEST 'Clang :: Driver/gcc-toolchain-libstdcxx.cpp' FAILED
********************
Exit Code: 1
Command Output (stderr):
--
/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/clang
--gcc-toolchain=/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/test/Driver/Inputs/gcc_toolchain_libstdcxx/gcc10/usr
-v 2>&1 |&
/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/FileCheck
/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/test/Driver/gcc-toolchain-libstdcxx.cpp
--check-prefix=GCC10 # RUN: at line 10
+
/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/clang
--gcc-toolchain=/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/test/Driver/Inputs/gcc_toolchain_libstdcxx/gcc10/usr
-v
+
/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/FileCheck
/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/test/Driver/gcc-toolchain-libstdcxx.cpp
--check-prefix=GCC10
/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/test/Driver/gcc-toolchain-libstdcxx.cpp:11:11:
error: GCC10: expected string not found in input
// GCC10: clang: warning: future releases of the clang compiler will prefer GCC
installations containing libstdc++ include directories;
'[[PREFIX:.*gcc_toolchain_libstdcxx/gcc10/usr/lib/gcc/x86_64-linux-gnu]]/10'
would be chosen over '[[PREFIX]]/12' [-Wgcc-install-dir-libstdcxx]
^
<stdin>:1:1: note: scanning from here
clang version 22.0.0git (https://github.com/llvm/llvm-project.git
50a3368f226ad954fc26c8d79c0a10e2b644350d)
^
Input file: <stdin>
Check file:
/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/test/Driver/gcc-toolchain-libstdcxx.cpp
```
Without an explicit `--target=`, `--gcc-toolchain=` may not be consumed,
leading to a warning.
`|&` is not a POSIX shell feature and cannot be used in lit test.
https://github.com/llvm/llvm-project/pull/145056
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