[rwmcguir]

Summary

Both tests_multi_driver_stdout and tests_sigle_driver_stdout terminate with Windows status 0xc0000409 in a Windows container using MSVC 19.43, while the other 257 CTest entries pass. The same tests pass on GitHub-hosted Windows with MSVC 19.51. This does not yet establish a compiler-related cause.

Both entries invoke the same stdout-capture helper, which currently ignores temporary-filename, file-open, and descriptor-operation errors.

Changes

• Log TEMP/TMP, filename buffer capacity, temporary filename generation, file opening, and descriptor redirection/restoration to stderr.
• Check setup and restoration operations and report failures through GoogleTest.
• Stop the test if capture setup fails, instead of using invalid descriptors.
• Keep the existing 50-byte filename buffer unchanged so this diagnostic run can establish whether it is responsible.

Validation

• Compiled the exact updated helper with C++14, warnings-as-errors, AddressSanitizer, and UndefinedBehaviorSanitizer on Linux.
• Exercised capture/restoration and invalid descriptor handling.
• Exercised the Windows branch with mocked CRT calls, including filename-generation and file-open failures.
• Native Windows execution remains to be verified; the consumer CI can check out this PR head to reproduce in the failing environment.

This is a diagnostic change; no root cause is asserted and no tests are excluded.

[github-actions]

Level Zero loader ABI check

last-release (v1.35.0): ✅ no ABI problems. Report

Creating compatibility report ...
Binary compatibility: 100%
Source compatibility: 100%
Total binary compatibility problems: 0, warnings: 0
Total source compatibility problems: 0, warnings: 0

master (master): ✅ no ABI problems. Report

Creating compatibility report ...
Binary compatibility: 100%
Source compatibility: 100%
Total binary compatibility problems: 0, warnings: 0
Total source compatibility problems: 0, warnings: 0

Workflow run

If an ABI change is intended, a reviewer with write access can accept it: leave an approval review on the PR head commit with the keyword abi-failure-approved in the review body. That re-runs the check.