Enable all NVCC warnings as errors

[mlubin]

Switch to --Werror=all-warnings and fix corresponding errors in preparation for adding more checks in #1944. Split out for easier review of CUDA changes.

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[mlubin]

/ok to test 502ae39

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ℹ️ Recent review info

⚙️ Run configuration

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Review profile: CHILL

Plan: Enterprise

Run ID: 350efa10-0091-4c49-873e-7059bc22d3e3

📥 Commits

Reviewing files that changed from the base of the PR and between 9acf7c8 and 502ae39.

📒 Files selected for processing (3)

• cpp/CMakeLists.txt
• cpp/src/mip_heuristics/feasibility_jump/load_balancing.cuh
• cpp/tests/CMakeLists.txt

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📝 Walkthrough

Walkthrough

The PR updates CUDA warning flags, selects architecture-specific kernel launch bounds, and changes DejaVu include-directory handling for test targets.

Changes

CUDA configuration updates

Layer / File(s)	Summary
CUDA compiler warning flags cpp/CMakeLists.txt	CUDA compilation enables --Werror=all-warnings, suppresses diagnostic 177, and retains the existing CUDA and host warning options.
Architecture-specific launch bounds cpp/src/mip_heuristics/feasibility_jump/load_balancing.cuh	load_balancing_mtm_compute_scores selects 8, 12, or 16 minimum blocks per SM based on the CUDA architecture. The SPDX year range now ends in 2026.
Test include configuration cpp/tests/CMakeLists.txt	Test utilities and configured test executables add ${dejavu_SOURCE_DIR} through separate SYSTEM PRIVATE include-directory declarations.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Other

Suggested reviewers: chris-maes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely states the main change: NVCC will treat all warnings as errors.
Description check	✅ Passed	The description directly explains the warning configuration change, the resulting fixes, and the reason for splitting the CUDA changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Commit to this branch
• Create a new PR

🧪 Generate unit tests (beta)

• Create a new PR

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CI Test Summary

✅ All 32 test job(s) passed.

[mlubin]

/merge