Adarsh-Me commented on PR #51315:
URL: https://github.com/apache/arrow/pull/51315#issuecomment-5648177147

   CI triage on the failing runs — one real bug (fixed), the rest 
infrastructure:
   
   **Fixed at f96c81bcf — the `AMD64 Ubuntu 24.04 R 4.6` / `Windows 2022 Python 
3.13` / other from-source pyarrow failures.** Root cause: the 
`ARROW_USE_STD_CHRONO` description in `DefineOptions.cmake` used an escaped 
backslash (`\\`) before the newline instead of a line-continuation backslash, 
so the newline stayed inside the quoted description and leaked into the 
generated `ArrowOptions.cmake` as a bare statement line (`AUTO keeps the 
current platform default (GH-51267)`). Every consumer that includes the 
installed file via `find_package(Arrow)` then failed with `Parse error. 
Expected "(", got identifier with text "keeps"` — that's the `ERROR: Failed 
building wheel for pyarrow` inside the R docker build and the Windows Python 
build. Reproduced locally with the exact generated file, fixed, and verified: 
the regenerated `ArrowOptions.cmake` parses clean via `find_package` (`parsed 
OK`).
   
   **Not from this PR:**
   - `macOS 15-intel C++`, `Windows MinGW CLANG64/MINGW64 C++` (and likely the 
remaining MinIO-dependent jobs): `dl.min.io` returns `410: Gone` while 
downloading the MinIO release archive — upstream infrastructure.
   - `Windows 2022 MATLAB`: workflow template error — `hashFiles('cpp/**, 
matlab/**')` failed to hash files on the runner; workflow-side.
   - `AMD64 Conda C++ AVX2`: `arrow-filesystem-test` fails with "Attempt to 
initialize S3 after it has been finalized" — pre-existing flake, this same job 
was the only failure on my merged #51203 as well.


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