Add Start-PSBuild -StopDevPowerShell switch

build.psm1

@@ -30,6 +30,10 @@ if ($IsLinux) {
 function Start-PSBuild {
     [CmdletBinding(DefaultParameterSetName='CoreCLR')]
     param(
+        # When specified this switch will stops running dev powershell
+        # to help avoid compilation error, because file are in use.
+        [switch]$StopDevPowerShell,
+
         [switch]$NoPath,
         [switch]$Restore,
         [string]$Output,
@@ -70,6 +74,18 @@ function Start-PSBuild {
         [string]$Configuration
     )
 
+    function Stop-DevPowerShell
+    {
+        Get-Process powershell* |
+            Where-Object { 
+                $_.Modules | 
+                Where-Object { 
+                    $_.FileName -eq (Resolve-Path $script:Options.Output).Path
+                } 
+            } | 
+        Stop-Process -Verbose
+    }
+
     if ($Clean)
     {
         log "Cleaning your working directory. You can also do it with 'git clean -fdX'"
@@ -153,6 +169,11 @@ function Start-PSBuild {
     }
     $script:Options = New-PSOptions @OptionsArguments
 
+    if ($StopDevPowerShell)
+    {
+        Stop-DevPowerShell
+    }
+
     # setup arguments
     $Arguments = @()
     if ($Publish) {
@@ -273,7 +294,6 @@ function Start-PSBuild {
 
 }
 
-
 function New-PSOptions {
     [CmdletBinding()]
     param(
@@ -729,7 +749,6 @@ function Publish-NuGetFeed
     }
 }
 
-
 function Start-DevPowerShell {
     param(
         [switch]$ZapDisable,