Imagine having a mathematics library, which provides some functionality optimized for IEEE754 number types. The code might have something along the lines of:

#if F16
    global using Scalar = System.Half;
#elif F32
    global using Scalar = System.Single;
#elif F32
    global using Scalar = System.Double;
#endif

// ...

or

#if F32
    public static float HighlyOptimizedMethod(float a, float b, float c) { ... };
#elif F64
    public static double HighlyOptimizedMethod(double a, double b, double c) { ... };
#endif

I now define those preprocessor constants F16, F32, F64 in my .csproj project file as follows:

<Project Sdk="Microsoft.NET.Sdk">
    <PropertyGroup>
        <!-- change the following for different precisions. -->
        <!--<Scalar>F16</Scalar>-->
        <!--<Scalar>F32</Scalar>-->
        <Scalar>F64</Scalar>

        <DefineConstants>$(DefineConstants);$(Scalar)</DefineConstants>
    </PropertyGroup>
    <PropertyGroup>
        <TargetFramework>net8.0</TargetFramework>

        <AssemblyName Condition="'$(Scalar)' != ''">mylibrary.$(Scalar)</AssemblyName>
        <AssemblyName Condition="'$(Scalar)' == ''">mylibrary</AssemblyName>
    
        ...
    </PropertyGroup>
</Project>

My question

Is it possible to make VisualStudio/dotnet/MSBuild create the assemblies for all three configurations at the same time when building the project? i.e. would it be possible to run ‘compile’ and then have the following file list in the bin/ directory?

• mylibrary.F16.dll
• mylibrary.F32.dll
• mylibrary.F64.dll

I tried fiddling around with something like this:

<Project Sdk="Microsoft.NET.Sdk">
    <PropertyGroup>
        <!-- change the following for different precisions. if all are commented out, every configuration will be built. -->
   
        <!--<Scalar>F16</Scalar>-->
        <!--<Scalar>F32</Scalar>-->
        <Scalar>F64</Scalar>

        <DefineConstants>$(DefineConstants);$(Scalar)</DefineConstants>
    </PropertyGroup>
    <Target Name="BuildOthers" BeforeTargets="CoreBuild" Condition="'$(Scalar)' == ''">
        <MSBuild Projects="$(MSBuildProjectFile)" Properties="Configuration=$(Configuration);Scalar=F16" />
        <MSBuild Projects="$(MSBuildProjectFile)" Properties="Configuration=$(Configuration);Scalar=F32" />
        <MSBuild Projects="$(MSBuildProjectFile)" Properties="Configuration=$(Configuration);Scalar=F64" />
    </Target>
    <PropertyGroup>
        <TargetFramework>net8.0</TargetFramework>

        ...

But it didn’t get it to work.
May someone be able to help me and/or point me into the right direction?

Thanks.