Normalize CUDA_ARCH_LIST and add explicit NVCC gencode flags for >SM99#123
Merged
jkawamoto merged 1 commit intojkawamoto:mainfrom Nov 13, 2025
Merged
Normalize CUDA_ARCH_LIST and add explicit NVCC gencode flags for >SM99#123jkawamoto merged 1 commit intojkawamoto:mainfrom
jkawamoto merged 1 commit intojkawamoto:mainfrom
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- honor CUDA_ARCH_LIST/CT2_CUDA_ARCH_LIST in build.rs and normalize tokens - keep legacy architectures in CUDA_ARCH_LIST for CMake, but emit -gencode flags for SM major >= 10 so new GPUs (Ada/Blackwell) bypass FindCUDA’s limits - allow optional extra NVCC flags to coexist with the small-binary compression flag
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Thanks for the PR! I tested it locally and it works great. Merging now. |
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Summary
CMake’s built-in
select_compute_arch.cmakehas no notion of the SM 8.9/12.0targets used by Ada and Blackwell GPUs, so passing those numbers through
CUDA_ARCH_LIST stops the build. This PR updates ct2rs’s build script to
normalize the env var tokens, keep older arches in CUDA_ARCH_LIST, and add
explicit
-gencodeflags for anything with a major version ≥ 10. That letsnewer GPUs compile cleanly without regressing older cards.
Usage
CUDA_ARCH_LIST(e.g.export CUDA_ARCH_LIST="8.9;12.0").cargo build --release --features "cuda,ct2rs/cuda,ct2rs/cudnn".newer ones automatically get direct NVCC
-gencodeentries.