WIP: C++20

Author: ptheywood

README.md

@@ -63,10 +63,10 @@ Building FLAME GPU has the following requirements. There are also optional depen
 
 + [CMake](https://cmake.org/download/) `>= 3.25.2`
 + [CUDA](https://developer.nvidia.com/cuda-downloads) `>= 11.2` and a [Compute Capability](https://developer.nvidia.com/cuda-gpus) `>= 3.5` NVIDIA GPU.
-+ C++17 capable C++ compiler (host), compatible with the installed CUDA version
-  + [Microsoft Visual Studio 2019 or 2022](https://visualstudio.microsoft.com/) (Windows)
++ C++20 capable C++ compiler (host), compatible with the installed CUDA version
+  + [Microsoft Visual Studio 2022](https://visualstudio.microsoft.com/) (Windows)
     + *Note:* Visual Studio must be installed before the CUDA toolkit is installed. See the [CUDA installation guide for Windows](https://docs.nvidia.com/cuda/cuda-installation-guide-microsoft-windows/index.html) for more information.
-  + [make](https://www.gnu.org/software/make/) and [GCC](https://gcc.gnu.org/) `>= 8.1` (Linux)
+  + [make](https://www.gnu.org/software/make/) and [GCC](https://gcc.gnu.org/) `>= 10` (Linux)
 + [git](https://git-scm.com/)
 
 Optionally:
@@ -79,7 +79,6 @@ Optionally:
   + Swig `4.x` will be automatically downloaded by CMake if not provided (if possible).
 + MPI (e.g. [MPICH](https://www.mpich.org/), [OpenMPI](https://www.open-mpi.org/)) for distributed ensemble support
   + MPI 3.0+ tested, older MPIs may work but not tested.
-  + CMake `>= 3.20.1` may be required for some MPI libraries / platforms.
 + [FLAMEGPU2-visualiser](https://github.com/FLAMEGPU/FLAMEGPU2-visualiser) dependencies
   + [SDL](https://www.libsdl.org/)
   + [GLM](http://glm.g-truc.net/) *(consistent C++/GLSL vector maths functionality)*