leonarski_fandClaude Opus 5
4e6600a96c
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CMAKE_CUDA_ARCHITECTURES had no sm_70 entry, and PTX only ever JIT-compiles forwards, so a V100 had no runnable code in the fatbin at all - every kernel launch failed with "no kernel image is available for execution on the device". Append 70 only for a CUDA 12 toolkit: CUDA 13 removed offline compilation for Volta, so an unconditional entry would break the RHEL 9, Ubuntu and Windows builds. 12.8/12.9 still emit it but warn on every .cu, hence -Wno-deprecated-gpu-targets. The append goes after ENABLE_LANGUAGE(CUDA), where the nvcc version is known, matching the existing sm_121 handling. Verified: all 15 CUDA sources compile for sm_70 (including ffbidx, which already guards on __CUDA_ARCH__ >= 700/800), and cuobjdump shows an sm_70 cubin in the built rugnux binary. Consequence worth documenting: a V100 can only run the artefacts built with CUDA 12 - the RHEL 8 packages and the portable Linux .tgz. Document that alongside the minimum NVIDIA driver of every released artefact (525.60.13 for CUDA 12, 580.65.06 for CUDA 13), which applies because the CUDA runtime is linked statically and cuFFT is bundled, so the driver is the only NVIDIA component the target host must supply. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
