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Build PowerShell on Windows for .NET Core
=========================================
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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.
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You can also [build PowerShell for Full .NET framework ](windows-full.md ) on Windows.
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Environment
===========
These instructions are tested on Windows 10 and Windows Server 2012
R2, though they should work anywhere the dependencies work.
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Git Setup
---------
Using Git requires it to be setup correctly; refer to the
[README ](../../README.md ) and
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[Contributing Guidelines ](../../.github/CONTRIBUTING.md ).
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This guide assumes that you have recursively cloned the PowerShell repository and `cd` ed into it.
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Visual Studio
----------------
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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 ](https://www.visualstudio.com/visual-studio-community-vs/ ).
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.NET CLI
--------
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We use the [.NET Command Line Interface][dotnet-cli] (`dotnet`) to build PowerShell.
The `Start-PSBootstrap` function will automatically install it and add it to your path:
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```powershell
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Import-Module ./build.psm1
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Start-PSBootstrap
```
The `Start-PSBootstrap` function itself does exactly this:
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```powershell
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Invoke-WebRequest -Uri https://raw.githubusercontent.com/dotnet/cli/rel/1.0.0/scripts/obtain/dotnet-install.ps1 -OutFile install.ps1
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./install.ps1
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```
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If you have any problems installing `dotnet` , please see their [documentation][cli-docs].
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[dotnet-cli]: https://github.com/dotnet/cli#new-to-net-cli
[cli-docs]: https://dotnet.github.io/getting-started/
Build using our module
======================
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We maintain a [PowerShell module ](../../build.psm1 ) with the function `Start-PSBuild` to build PowerShell.
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```powershell
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Import-Module ./build.psm1
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Start-PSBuild
```
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Congratulations! If everything went right, PowerShell is now built and executable as `./src/powershell-win-core/bin/Debug/netcoreapp1.0/win10-x64/powershell` .
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This location is of the form `./[project]/bin/[configuration]/[framework]/[rid]/[binary name]` ,
and our project is `powershell` , configuration is `Debug` by default,
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framework is `netcoreapp1.1` , runtime identifier is **probably** `win10-x64`
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(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)` .
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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` .
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You can run our cross-platform Pester tests with `Start-PSPester` .
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Building in Visual Studio
-----------------------------
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We do not recommend building the PowerShell solution from Visual Studio.
This may lead to package version mismatches with errors similar to:
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```
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` .