Bugfix - gpu_stream: remove ROCm build support, require CUDA with NVML

[polarG]

Summary

The gpu_stream benchmark has NVIDIA-specific dependencies that prevent it from compiling on ROCm 6.3+. This change makes it CUDA-only, gracefully skipping the build with a warning on non-NVIDIA
environments.

Problem

The gpu_stream benchmark fails to compile on ROCm 6.3+ due to multiple NVIDIA-specific dependencies:

1. nvml.h — NVIDIA Management Library header, used for querying actual memory clock rates. No HIP equivalent. Referenced in gpu_stream.cu and gpu_stream_utils.hpp.
2. cuda.h in headers — Three .hpp files (gpu_stream.hpp, gpu_stream_kernels.hpp, gpu_stream_utils.hpp) directly include <cuda.h> and <cuda_runtime.h>. These headers are not processed by hipify-perl (only
   .cu source files are), so they fail to resolve on ROCm.
3. Deprecated hipDeviceProp_t struct fields — The code accesses memoryBusWidth, memoryClockRate, and ECCEnabled from the device properties struct. These fields were removed from hipDeviceProp_t in ROCm
   6.3, causing compilation errors after hipification.

The existing ROCm path was marked as incomplete (# TODO: test for ROC) and was never fully functional on recent ROCm versions.

Changes

• Removed the non-functional ROCm/HIP build path from gpu_stream/CMakeLists.txt
• When CUDA is not found, prints a warning and returns gracefully instead of attempting a broken hipify build or raising FATAL_ERROR
• No changes to the NVIDIA/CUDA build path — it continues to work as before

Impact

• NVIDIA builds: No change — gpu_stream builds and installs normally
• ROCm builds: gpu_stream is skipped with a warning message. Previously it would fail the entire make cppbuild step, blocking the Docker image build
• Other benchmarks: Unaffected — build.sh continues to the next benchmark after gpu_stream returns

[Copilot]

Pull request overview

Removes the broken ROCm/HIP build path for the gpu_stream benchmark, making it CUDA-only with a graceful warning when CUDA is not found.

Changes:

• Replaced the non-functional ROCm/HIP build path and FATAL_ERROR fallback with a WARNING message and return()
• No changes to the CUDA build path

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.70%. Comparing base (6b8e810) to head (2bf019a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #789   +/-   ##
=======================================
  Coverage   85.70%   85.70%           
=======================================
  Files         102      102           
  Lines        7703     7703           
=======================================
  Hits         6602     6602           
  Misses       1101     1101           

Flag	Coverage Δ
cpu-python3.10-unit-test	70.96% <ø> (ø)
cpu-python3.12-unit-test	70.96% <ø> (ø)
cpu-python3.7-unit-test	70.43% <ø> (ø)
cuda-unit-test	83.59% <ø> (ø)

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