Phase 9 successfully resolved runtime loading issues where CUDA backend
failed to load due to undefined Flash Attention symbols.
Solution:
- Disabled flash attention helper functions (lines 126-274 in fattn.cu)
- Simplified ggml_cuda_flash_attn_ext() to abort immediately for CC 3.7
- Added GGML_UNUSED macros to prevent compiler warnings
- Added ggml_backend_cuda_score() function for backend selection
Testing Results:
✅ CUDA backend loads without undefined symbol errors
✅ GPU layers offload correctly (e.g., 35/35 for gemma3:4b)
✅ Fast GPU inference confirmed working
Flash Attention is not supported on CC 3.7 (requires Volta/Tensor Cores).
If attempted, gracefully aborts with clear error message.
All 9 phases of CC 3.7-only optimization now complete and tested.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
