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feat(nix-builder): add ARM64 target for CUDA backend on Windows - #760
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Add a -TargetArch parameter to builder.ps1 (x64 | ARM64, defaults to host architecture) to build the CUDA backend for Windows on Arm: - Get-CMakeConfigureArgs passes the target arch as the Visual Studio generator platform (-A ARM64) - Initialize-VSEnvironment selects the matching vcvarsall.bat argument (arm64, x64_arm64, arm64_x64) to support cross-compilation - Informative messages for CUDA/ARM64 (requires CUDA 13.0+) and a warning for ARM64 with non-CUDA backends
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Add a -TargetArch parameter to builder.ps1 (x64 | ARM64, defaults to host architecture) to build the CUDA backend for Windows on Arm:
Get-CMakeConfigureArgs passes the target arch as the Visual Studio generator platform (-A ARM64)
Initialize-VSEnvironment selects the matching vcvarsall.bat argument (arm64, x64_arm64, arm64_x64) to support cross-compilation
Informative messages for CUDA/ARM64 (requires CUDA 13.0+) and a warning for ARM64 with non-CUDA backends
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