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Example: https://github.com/llvm/llvm-project/actions/runs/15640136104/job/44065277309?pr=144114
The end of the build logs:
[6786/6786] Running unit test libc.test.src.math.smoke.lrintf128_test.__unit__
[==========] Running 3 tests from 1 test suite.
[ RUN ] LlvmLibcRoundToIntegerTest.InfinityAndNaN
[ OK ] LlvmLibcRoundToIntegerTest.InfinityAndNaN (7 us)
[ RUN ] LlvmLibcRoundToIntegerTest.RoundNumbers
[ OK ] LlvmLibcRoundToIntegerTest.RoundNumbers (6 us)
[ RUN ] LlvmLibcRoundToIntegerTest.SubnormalRange
[ OK ] LlvmLibcRoundToIntegerTest.SubnormalRange (1114 ms)
Ran 3 tests. PASS: 3 FAIL: 0
ninja: build stopped: cannot make progress due to previous errors.
+ at-exit
+ retcode=1
+ ccache --print-stats
+ cp /home/gha/actions-runner/_work/llvm-project/llvm-project/build/.ninja_log artifacts/.ninja_log
+ cp '/home/gha/actions-runner/_work/llvm-project/llvm-project/build/test-results.*.xml' artifacts/
cp: cannot stat '/home/gha/actions-runner/_work/llvm-project/llvm-project/build/test-results.*.xml': No such file or directory
+ :
+ shopt -s nullglob
+ command -v buildkite-agent
+ python3 /home/gha/actions-runner/_work/llvm-project/llvm-project/.ci/generate_test_report_github.py ':penguin: Linux x64 Test Results' 1
Error: Process completed with exit code 1.
My guess as to what's happening: Since libc isn't using lit it doesn't create the test-results.<whatever>.xml that the premerge testing is expecting. That would explain the failures, but not why it sometimes passes. Maybe there are sometimes leftovers from previous runs?