[Build] Fix cross platform CMake and add messages when enabling backends

[SiriusNEO]

Address some issues in thread: #2114

Summary by CodeRabbit

Release Notes

• Chores
  • Enhanced build-time diagnostics with status messages for active backend configurations (CUDA, Metal, ROCm)
  • Improved backend dependency linking to better preserve existing library references

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1b5b4055-f1e0-4700-9a15-925ecfdbc9eb

📥 Commits

Reviewing files that changed from the base of the PR and between beef5cf and 8bc7b3a.

📒 Files selected for processing (3)

• src/backend/cuda/CMakeLists.txt
• src/backend/metal/CMakeLists.txt
• src/backend/rocm/CMakeLists.txt

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📝 Walkthrough

Walkthrough

Backend CMake configurations across CUDA, Metal, and ROCm are updated to emit build-time status messages indicating backend enablement. Additionally, CUDA and ROCm stub library registration transitions from overwriting to appending list entries, preserving prior stub configurations.

Changes

Backend CMake Configuration

Layer / File(s)	Summary
Backend Enablement Status Logging src/backend/cuda/CMakeLists.txt, src/backend/metal/CMakeLists.txt, src/backend/rocm/CMakeLists.txt	Status messages added to CUDA, Metal, and ROCm CMake configurations to log when each backend is enabled during build configuration.
Stub Library Registration to Append src/backend/cuda/CMakeLists.txt, src/backend/rocm/CMakeLists.txt	Stub library registration for CUDA (cuda_stub, cudart_stub, nvrtc_stub) and ROCm (hip_stub, hiprtc_stub) changed from overwriting TILELANG_ACTIVE_BACKEND_STUB_LINK and TILELANG_ACTIVE_BACKEND_STUB_TARGETS lists to appending, preserving existing entries.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• tile-ai/tilelang#2114: Introduces the same backend stub-linking variables and logic that this PR refines through list append operations.
• tile-ai/tilelang#2164: Also modifies CUDA/ROCm backend CMakeLists for stub handling and source path registration.
• tile-ai/tilelang#1821: Introduces CUDA/HIP/ROCm stub registration logic that this PR adapts by switching to list append.

Poem

🐰 A rabbit hops through CMake lands,
Adding logs where backends stand,
No more overwrites, just appends please—
Building stubs with greater ease!
Three backends bright, now logging true. ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main changes: adding backend enable messages and fixing CMake list append logic for cross-platform compatibility.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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