How To for nuget

This document describes one way of how to create a nuget package for .NET containing the highs solver for different runtimes.

Steps

Build shared libraries

For all desired targets, build a shared library of the c++ highs solver, e.g.

• win-x64
• linux-x64
• linux-arm64

Move the files to the runtimes subfolder of the nuget folder

Copy the resulting libraries into the runtimes sub folder

• nuget/runtimes/win-x64/highs.dll
• nuget/runtimes/linux-x64/libhighs.so
• nuget/runtimes/linux-arm64/libhighs.so

Create the package

Run the dotet command to build and pack the package in the nuget directory. The required csproj. file is already present in the nuget folder

• dotnet pack -c Release /p:Version=$version

Checking the package

In order to check if the runtimes are contained in the nuget package, one can open the nupkg file in a tool like 7zip and check the runtimes folder.

nuget structure for native libraries

The nuget package is required to look like this for the native libraries

package/
|-- lib/
|   |-- netstandard2.0/
|       |-- highs_csharp_api.dll
|-- runtimes/
|   |-- linux-x64/
|   |   |-- native/
|   |       ! [linux-x64 native libraries]
|   |-- linux-arm64/
|   |   |-- native/
|   |       ! [linux-arm64 native libraries]
|   |-- win-x64/
|   |   |-- native/
|   |       ! [win-x64 native libraries]

Examples for the builds

These are examples, how one might run the builds on an ubuntu system, e.g. as a wsl Compiler flags should be adjusted to provide the best performance

linux-x64

This should run on a linux system

mkdir build_linux
cd build_linux
cmake .. -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=ON -DCMAKE_CXX_FLAGS="-O3 -march=native" -DCMAKE_C_FLAGS="-O3 -march=native"
make

linux-arm64

This might run on a linux-x64 system (or use a linux-arm64 system and skipp the toolchain part)

mkdir build_arm
cd build_arm
cmake .. -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=ON -DCMAKE_TOOLCHAIN_FILE=../arm-toolchain.cmake
make

win-x64

This should run on a windows system

mkdir build_windows
cd build_windows
cmake .. -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=ON -DCMAKE_SYSTEM_NAME=Windows -A x64
make