error[E0425]: cannot find function cudaImportExternalMemory in module sys

[EricLBuehler]

Hi @coreylowman!

We are running into a strange error when attempting to compile cudarc 0.12.2 on Windows.

This is the error:

error[E0422]: cannot find struct, variant or union type `cudaExternalMemoryHandleDesc_st__bindgen_ty_1` in module `sys`
    --> C:\Users\ericl\.cargo\registry\src\index.crates.io-6f17d22bba15001f\cudarc-0.12.2\src\runtime\result.rs:988:26
     |
988  |             handle: sys::cudaExternalMemoryHandleDesc_st__bindgen_ty_1 {
     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: a union with a similar name exists: `cudaExternalMemoryHandleDesc__bindgen_ty_1`
     |
    ::: C:\Users\ericl\.cargo\registry\src\index.crates.io-6f17d22bba15001f\cudarc-0.12.2\src\runtime\sys\sys_12060.rs:4388:1
     |
4388 | pub union cudaExternalMemoryHandleDesc__bindgen_ty_1 {
     | ---------------------------------------------------- similarly named union `cudaExternalMemoryHandleDesc__bindgen_ty_1` defined here    

error[E0422]: cannot find struct, variant or union type `cudaExternalMemoryHandleDesc_st__bindgen_ty_1__bindgen_ty_1` in module `sys`
    --> C:\Users\ericl\.cargo\registry\src\index.crates.io-6f17d22bba15001f\cudarc-0.12.2\src\runtime\result.rs:989:29
     |
989  |                 win32: sys::cudaExternalMemoryHandleDesc_st__bindgen_ty_1__bindgen_ty_1 {
     |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: a struct with a similar name exists: `cudaExternalMemoryHandleDesc__bindgen_ty_1__bindgen_ty_1`
     |
    ::: C:\Users\ericl\.cargo\registry\src\index.crates.io-6f17d22bba15001f\cudarc-0.12.2\src\runtime\sys\sys_12060.rs:4395:1
     |
4395 | pub struct cudaExternalMemoryHandleDesc__bindgen_ty_1__bindgen_ty_1 {
     | ------------------------------------------------------------------- similarly named struct `cudaExternalMemoryHandleDesc__bindgen_ty_1__bindgen_ty_1` defined here

error[E0425]: cannot find function `cudaImportExternalMemory` in module `sys`
   --> C:\Users\ericl\.cargo\registry\src\index.crates.io-6f17d22bba15001f\cudarc-0.12.2\src\runtime\result.rs:997:14
    |
997 |         sys::cudaImportExternalMemory(external_memory.as_mut_ptr(), &handle_description)
    |              ^^^^^^^^^^^^^^^^^^^^^^^^ not found in `sys`

And my driver information:

> nvidia-smi                                                                                                 01/07/2025 03:32:33 AM
Tue Jan  7 03:32:53 2025       
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 566.36                 Driver Version: 566.36         CUDA Version: 12.7     |
|-----------------------------------------+------------------------+----------------------+
| GPU  Name                  Driver-Model | Bus-Id          Disp.A | Volatile Uncorr. ECC |
| Fan  Temp   Perf          Pwr:Usage/Cap |           Memory-Usage | GPU-Util  Compute M. |
|                                         |                        |               MIG M. |
|=========================================+========================+======================|
|   0  NVIDIA GeForce RTX 4070 ...  WDDM  |   00000000:01:00.0 Off |                  N/A |
| N/A   43C    P3             13W /   60W |       0MiB /   8188MiB |      0%      Default |
|                                         |                        |                  N/A |
+-----------------------------------------+------------------------+----------------------+

+-----------------------------------------------------------------------------------------+
| Processes:                                                                              |
|  GPU   GI   CI        PID   Type   Process name                              GPU Memory |
|        ID   ID                                                               Usage      |
|=========================================================================================|
|  No running processes found                                                             |
+-----------------------------------------------------------------------------------------+

nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2024 NVIDIA Corporation
Built on Wed_Oct_30_01:18:48_Pacific_Daylight_Time_2024
Cuda compilation tools, release 12.6, V12.6.85
Build cuda_12.6.r12.6/compiler.35059454_0

Is this something which you have run into?

[zlogic]

This looks like a Windows-only bug, and is fixed in #305

[EricLBuehler]

Yes, it appears so. I actually opened a (I realize, duplicate) PR in #308 - I'll close that!

[coreylowman]

Fixed in 0.13.0, live on crates.io