[libcxx] [libcxxabi] [libunwind] [libc++abi][libunwind] Run c++abi and unwind tests against a fake install root (PR #110171)

[via cfe-commits]

zeroomega wrote:

We are seeing a test failure on linux-x64 runtime after this patch landed.

Error message:
```
[245/246](1) Running runtimes regression tests
llvm-lit: /b/s/w/ir/x/w/llvm-llvm-project/llvm/utils/lit/lit/TestingConfig.py:154: fatal: unable to parse config file '/b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/libunwind/test/lit.site.cfg', traceback: Traceback (most recent call last):
  File "/b/s/w/ir/x/w/llvm-llvm-project/llvm/utils/lit/lit/TestingConfig.py", line 142, in load_from_path
    exec(compile(data, path, "exec"), cfg_globals, None)
  File "/b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/libunwind/test/lit.site.cfg", line 46, in <module>
    libcxx.test.config.configure(
  File "/b/s/w/ir/x/w/llvm-llvm-project/libcxx/utils/libcxx/test/config.py", line 44, in configure
    actions = feature.getActions(config)
  File "/b/s/w/ir/x/w/llvm-llvm-project/libcxx/utils/libcxx/test/dsl.py", line 647, in getActions
    if not self._isSupported(config):
  File "/b/s/w/ir/x/w/llvm-llvm-project/libcxx/utils/libcxx/test/features.py", line 291, in <lambda>
    and not programSucceeds(
  File "/b/s/w/ir/x/w/llvm-llvm-project/libcxx/utils/libcxx/test/dsl.py", line 68, in f
    cache[cacheKey] = function(config, *args, **kwargs)
  File "/b/s/w/ir/x/w/llvm-llvm-project/libcxx/utils/libcxx/test/dsl.py", line 203, in programSucceeds
    programOutput(config, program, args)
  File "/b/s/w/ir/x/w/llvm-llvm-project/libcxx/utils/libcxx/test/dsl.py", line 68, in f
    cache[cacheKey] = function(config, *args, **kwargs)
  File "/b/s/w/ir/x/w/llvm-llvm-project/libcxx/utils/libcxx/test/dsl.py", line 173, in programOutput
    raise ConfigurationCompilationError(
libcxx.test.dsl.ConfigurationCompilationError: Failed to build program, cmd:
['/b/s/w/ir/x/w/llvm_build/./bin/clang++ /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/test/__config_src__/tmp6ibehrxq.cpp -isysroot /b/s/w/ir/x/w/cipd/linux --target=x86_64-unknown-linux-gnu -nostdinc++ -I /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/libunwind/test-suite-install/include -funwind-tables -std=c++26 -Werror -Wall -Wctad-maybe-unsupported -Wextra -Wshadow -Wundef -Wunused-template -Wno-unused-command-line-argument -Wno-attributes -Wno-pessimizing-move -Wno-noexcept-type -Wno-atomic-alignment -Wno-reserved-module-identifier -Wdeprecated-copy -Wdeprecated-copy-dtor -Wno-user-defined-literals -Wno-tautological-compare -Wsign-compare -Wunused-variable -Wunused-parameter -Wunreachable-code -Wno-unused-local-typedef -Wno-local-type-template-args -Wno-c++11-extensions -Wno-unknown-pragmas -Wno-pass-failed -Wno-mismatched-new-delete -Wno-redundant-move -Wno-self-move -D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER -Werror=thread-safety -Wuser-defined-warnings  /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/libunwind/test-suite-install/lib/libunwind.a -lpthread -Wl,--export-dynamic -ldl -o /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/test/__config_exec__/Output/tmp6ibehrxq.cpp.dir/t.tmp.exe']
stderr is:
clang++: error: no such file or directory: '/b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/libunwind/test-suite-install/lib/libunwind.a'


FAILED: CMakeFiles/check-runtimes /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/CMakeFiles/check-runtimes 
cd /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins && /b/s/w/ir/cipd_bin_packages/cpython3/bin/python3.8 /b/s/w/ir/x/w/llvm_build/./bin/llvm-lit --resultdb-output=r.j -v --param HWASAN_ENABLE_ALIASES=1 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/libunwind/test /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/libcxxabi/test /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/libcxx/test /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/interception/Unit /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/lsan/X86_64LsanConfig /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/lsan/X86_64AsanConfig /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/lsan/X86_64HWAsanConfig /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/ubsan/Standalone-x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/ubsan/Standalone-lld-x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/ubsan/AddressSanitizer-x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/ubsan/AddressSanitizer-lld-x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/ubsan/MemorySanitizer-x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/ubsan/MemorySanitizer-lld-x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/ubsan/ThreadSanitizer-x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/ubsan/ThreadSanitizer-lld-x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/sanitizer_common/asan-x86_64-Linux /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/sanitizer_common/lsan-x86_64-Linux /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/sanitizer_common/msan-x86_64-Linux /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/sanitizer_common/tsan-x86_64-Linux /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/sanitizer_common/ubsan-x86_64-Linux /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/sanitizer_common/Unit /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/fuzzer/unit /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/fuzzer/X86_64DefaultLinuxConfig /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/fuzzer/X86_64StaticLibcxxLinuxConfig /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/metadata /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/asan/X86_64LinuxConfig /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/asan/Unit/X86_64LinuxConfig /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/asan/X86_64LinuxDynamicConfig /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/asan/Unit/X86_64LinuxDynamicConfig /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/rtsan/X86_64LinuxConfig /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/rtsan/Unit /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/dfsan/X86_64Config /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/msan/X86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/msan/lld-X86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/msan/Unit /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/hwasan/X86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/tsan/X86_64Config /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/tsan/Unit /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/safestack/Standalone-x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/cfi/Standalone-x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/cfi/Devirt-x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/cfi/Standalone-thinlto-x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/cfi/Devirt-thinlto-x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/cfi/Standalone-lld-x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/cfi/Devirt-lld-x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/cfi/Standalone-lld-thinlto-x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/cfi/Devirt-lld-thinlto-x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/scudo/standalone/unit /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/scudo/standalone/unit/gwp_asan /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/ubsan_minimal/x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/gwp_asan/unit /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/gwp_asan/X86_64LinuxConfig /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/nsan/X86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/nsan/Unit /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/profile/Profile-x86_64 /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/ctx_profile/X86_64LinuxConfig /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/ctx_profile/Unit/X86_64LinuxConfig /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/memprof/X86_64LinuxConfig /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/memprof/Unit/X86_64LinuxConfig /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/memprof/X86_64LinuxDynamicConfig /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/xray/X86_64LinuxConfig /b/s/w/ir/x/w/llvm_build/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/compiler-rt/test/orc/X86_64LinuxConfig
ninja: build stopped: subcommand failed.
FAILED: runtimes/CMakeFiles/check-runtimes-x86_64-unknown-linux-gnu /b/s/w/ir/x/w/llvm_build/runtimes/CMakeFiles/check-runtimes-x86_64-unknown-linux-gnu 

```

It looks like cmake pointed a wrong libunwind path to the clang. We are still investigating.

https://github.com/llvm/llvm-project/pull/110171