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Build PowerShell on Windows for .NET Core

This guide will walk you through building PowerShell on Windows, targeting .NET Core. We'll start by showing how to set up your environment from scratch.

You can also build PowerShell for Full .NET framework on Windows.

Environment

These instructions are tested on Windows 10 and Windows Server 2012 R2, though they should work anywhere the dependencies work.

Git Setup

Using Git requires it to be setup correctly; refer to the README and Contributing Guidelines.

This guide assumes that you have recursively cloned the PowerShell repository and cded into it.

Visual Studio

You will need to install an edition of Visual Studio 2015 (Community, Enterprise, or Professional) with the optional feature 'Common Tools for Visual C++' installed. The free Community edition of Visual Studio 2015 can be downloaded here.

.NET CLI

We use the .NET Command Line Interface (dotnet) to build PowerShell. The Start-PSBootstrap function will automatically install it and add it to your path:

Import-Module ./build.psm1
Start-PSBootstrap

The Start-PSBootstrap function itself does exactly this:

Invoke-WebRequest -Uri https://raw.githubusercontent.com/dotnet/cli/rel/1.0.0/scripts/obtain/install.ps1 -OutFile install.ps1
./install.ps1

If you have any problems installing dotnet, please see their documentation.

The version of .NET CLI is very important, you want a recent build of 1.0.0 (not 1.0.1).

Previous installations of DNX, dnvm, or older installations of .NET CLI can cause odd failures when running. Please check your version.

Build using our module

We maintain a PowerShell module with the function Start-PSBuild to build PowerShell.

Import-Module ./build.psm1
Start-PSBuild

Congratulations! If everything went right, PowerShell is now built and executable as ./src/powershell-win-core/bin/Debug/netcoreapp1.0/win10-x64/powershell.

This location is of the form ./[project]/bin/[configuration]/[framework]/[rid]/[binary name], and our project is powershell, configuration is Debug by default, framework is netcoreapp1.0, runtime identifier is probably win10-x64 (but will depend on your operating system; don't worry, dotnet --info will tell you what it was), and binary name is powershell. The function Get-PSOutput will return the path to the executable; thus you can execute the development copy via & (Get-PSOutput).

The powershell project is the .NET Core PowerShell host. It is the top level project, so dotnet build transitively builds all its dependencies, and emits a powershell executable. The cross-platform host has built-in documentation via --help.

You can run our cross-platform Pester tests with Start-PSPester.

Building in Visual Studio

We do not recommend building the Poweshell solution from Visual Studio. This may lead to package version mismatches with errors similar to:

C:\dev\powershell\src\System.Management.Automation\project.json(142,77): error NU1001: The dependency Microsoft.PowerShe
ll.CoreCLR.AssemblyLoadContext >= 1.0.0-* could not be resolved.

If you find yourself blocked by these errors, either run git clean -ffdx or run Start-PSBuild -Clean.