Build problem on Linux (ubuntu 22.04): No known features for CXX compiler "GNU" version 9.3.0.

[compressionist]

Hey all, I'm having an issue on a Linux machine (ubuntu 22.04):

When running "cmake . -B build -DCMAKE_CUDA_COMPILER=/usr/local/cuda-11.6/bin/nvcc" I get

-- Using X11 for window creation
-- OptiX_INSTALL_DIR value: /usr/local/NVIDIA-OptiX-SDK-7.4.0-linux64-x86_64
-- pybind11 v2.7.1 
CMake Warning (dev) at /snap/cmake/1005/share/cmake-3.22/Modules/CMakeDependentOption.cmake:84 (message):
  Policy CMP0127 is not set: cmake_dependent_option() supports full Condition
  Syntax.  Run "cmake --help-policy CMP0127" for policy details.  Use the
  cmake_policy command to set the policy and suppress this warning.
Call Stack (most recent call first):
  dependencies/pybind11/CMakeLists.txt:98 (cmake_dependent_option)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Targeting GPU architectures: 75
-- Configuring done
CMake Error in CMakeLists.txt:
  No known features for CXX compiler

  "GNU"

  version 9.3.0.

How to fix it?

[wyhuai]

I got the same problem for gcc 7.5.0

[Tom94]

Does it help to manually set environment variables as described in #28?

[compressionist]

I compiled it with:

export CC=/usr/bin/gcc-11
export CXX=/usr/bin/g++-11
cmake .  -DCMAKE_CUDA_COMPILER=/usr/local/cuda-11.6/bin/nvcc
make
I then ran: "~/instant-ngp$ ./testbed --no-gui --scene data/nerf/fox"

It looks like it works. But, how long should this example run on a 6000 Quadro RTX?
How can I know that everything compiled fine?

[Tom94]

You can use the provided python bindings (scripts/run.py contains an example) to train for a set number of steps and to render an image afterwards. Cheers!