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Couldn't load codegen backend, specified module could not be found

#327Openkafji 创建于 2025-11-30
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kafjicommented
Hi, I'm trying to build the example described in the [getting started guide](https://rust-gpu.github.io/rust-cuda/guide/getting_started.html) on Windows but I got an error: ``` > cargo build Compiling rustc_codegen_nvvm v0.3.0 (https://github.com/rust-gpu/rust-cuda?rev=7fa76f3d717038a92c90bf4a482b0b8dd3259344#7fa76f3d) Compiling cuda_builder v0.3.0 (https://github.com/rust-gpu/rust-cuda?rev=7fa76f3d717038a92c90bf4a482b0b8dd3259344#7fa76f3d) Compiling rust-cuda-basic v0.1.0 (D:\workspace\rust-cuda-basic) error: failed to run custom build command for `rust-cuda-basic v0.1.0 (D:\workspace\rust-cuda-basic)` note: To improve backtraces for build dependencies, set the CARGO_PROFILE_DEV_BUILD_OVERRIDE_DEBUG=true environment variable to enable debug information generation. Caused by: process didn't exit successfully: `D:\workspace\rust-cuda-basic\target\debug\build\rust-cuda-basic-11d5ae9c94c06876\build-script-build` (exit code: 101) --- stdout cargo::rerun-if-changed=build.rs cargo::rerun-if-changed=kernels cargo:rerun-if-changed=D:\workspace\rust-cuda-basic\kernels --- stderr error: failed to run `rustc` to learn about target-specific information Caused by: process didn't exit successfully: `C:\Users\Carrot\.rustup\toolchains\nightly-2025-08-04-x86_64-pc-windows-msvc\bin\rustc.exe - --crate-name ___ --print=file-names -Zcodegen-backend=D:\workspace\rust-cuda-basic\target\debug\rustc_codegen_nvvm.dll -Zcrate-attr=feature(register_tool) -Zcrate-attr=register_tool(nvvm_internal) -Zcrate-attr=no_std -Zsaturating_float_casts=false "-Cllvm-args=-arch=compute_75 --override-libm" --target nvptx64-nvidia-cuda --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=split-debuginfo --print=crate-name --print=cfg -Wwarnings` (exit code: 1) --- stderr error: couldn't load codegen backend \\?\D:\workspace\rust-cuda-basic\target\debug\rustc_codegen_nvvm.dll: LoadLibraryExW failed: The specified module could not be found. (os error 126) (The specified module could not be found. (os error 126)) (retried 5 times) thread 'main' panicked at build.rs:17:10: called `Result::unwrap()` on an `Err` value: BuildFailed stack backtrace: 0: std::panicking::begin_panic_handler at /rustc/f34ba774c78ea32b7c40598b8ad23e75cdac42a6/library\std\src\panicking.rs:697 1: core::panicking::panic_fmt at /rustc/f34ba774c78ea32b7c40598b8ad23e75cdac42a6/library\core\src\panicking.rs:75 2: core::result::unwrap_failed at /rustc/f34ba774c78ea32b7c40598b8ad23e75cdac42a6/library\core\src\result.rs:1852 3: build_script_build::main 4: core::ops::function::FnOnce::call_once note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace. ``` But the codegen backend path does exist: ``` > ls D:\workspace\rust-cuda-basic\target\debug\rustc_codegen_nvvm.dll Directory: D:\workspace\rust-cuda-basic\target\debug Mode LastWriteTime Length Name ---- ------------- ------ ---- -a--- 30/11/2025 9:39 am 31755776 rustc_codegen_nvvm.dll ``` Any idea on what the actual problem is? I'm using the prebuilt LLVM and CUDA 13. Repro can be found [here](https://github.com/kafji/rust-cuda-basic).
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