# Cannot build with CUDA

Tool: Verilog to DB

Subcategory: Compiler version mismatch

## Conversation

### yathAg
I am trying to build Openroad with cmake .. -DGPU=true and I get the following output

```
-- GPU is enabled
-- CUDA is found
-- The CUDA compiler identification is NVIDIA 10.1.243
-- Detecting CUDA compiler ABI info
-- Detecting CUDA compiler ABI info - done
-- Check for working CUDA compiler: /usr/bin/nvcc - skipped
-- Detecting CUDA compile features
-- Detecting CUDA compile features - done
-- Found re2: /opt/or-tools/lib/cmake/re2/re2Config.cmake (found version "9.0.0") 
-- Found Clp: /opt/or-tools/lib/cmake/Clp/ClpConfig.cmake (found version "1.17.7") 
-- Found Cbc: /opt/or-tools/lib/cmake/Cbc/CbcConfig.cmake (found version "2.10.7") 
-- Found Eigen3: /usr/local/share/eigen3/cmake/Eigen3Config.cmake (found version "3.4.0") 
-- Found SCIP: /opt/or-tools/lib/cmake/scip/scip-config.cmake (found version "8.0.1") 
-- GUI is enabled
-- Found Boost: /usr/local/lib/cmake/Boost-1.80.0/BoostConfig.cmake (found version "1.80.0") found components: serialization 
-- Found OpenMP_CXX: -fopenmp (found version "4.5") 
-- Found OpenMP: TRUE (found version "4.5")  
-- Could NOT find VTune (missing: VTune_LIBRARIES VTune_INCLUDE_DIRS) 
-- Found Boost: /usr/local/lib/cmake/Boost-1.80.0/BoostConfig.cmake (found suitable version "1.80.0", minimum required is "1.78")  
-- Found Boost: /usr/local/lib/cmake/Boost-1.80.0/BoostConfig.cmake (found version "1.80.0") found components: serialization system thread 
-- TCL readline enabled
-- Tcl Extended disabled
-- Python3 enabled
-- Configuring done
CMake Warning (dev) in src/gpl/CMakeLists.txt:
  Policy CMP0104 is not set: CMAKE_CUDA_ARCHITECTURES now detected for NVCC,
  empty CUDA_ARCHITECTURES not allowed.  Run "cmake --help-policy CMP0104"
  for policy details.  Use the cmake_policy command to set the policy and
  suppress this warning.

  CUDA_ARCHITECTURES is empty for target "gpl".
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Error in src/gpl/CMakeLists.txt:
  Target "gpl" requires the language dialect "CUDA17" .  But the current
  compiler "NVIDIA" does not support this, or CMake does not know the flags
  to enable it.


-- Generating done
CMake Generate step failed.  Build files cannot be regenerated correctly.
```

I have Cuda installed and on `nvidia-smi` I get 

```
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 525.85.12    Driver Version: 525.85.12    CUDA Version: 12.0     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|                               |                      |               MIG M. |
|===============================+======================+======================|
|   0  NVIDIA GeForce ...  On   | 00000000:01:00.0  On |                  N/A |
| N/A   51C    P5    18W / 115W |    187MiB /  6144MiB |     19%      Default |
|                               |                      |                  N/A |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                                  |
|  GPU   GI   CI        PID   Type   Process name                  GPU Memory |
|        ID   ID                                                   Usage      |
|=============================================================================|
|    0   N/A  N/A      1211      G   /usr/lib/xorg/Xorg                 52MiB |
|    0   N/A  N/A      1875      G   /usr/lib/xorg/Xorg                133MiB |
+-----------------------------------------------------------------------------+
```

and on `nvcc -V`

```
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2019 NVIDIA Corporation
Built on Sun_Jul_28_19:07:16_PDT_2019
Cuda compilation tools, release 10.1, V10.1.243
```
Any help on how to get the setup working is really appreciated and thanks in advanced.







### vvbandeira
Please install a newer version of `nvcc` and try again. As per NVIDIA docs, you will require at least v11; see more [here](https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#c-17-language-features).

### maliberty
If we bump to cmake 3.10 then https://cmake.org/cmake/help/latest/module/FindCUDA.html suggests we can use the usual VERSION keyword.

FYI - the use of CUDA is quite minimal and probably not worth the bother at this point.