Get rid of "!" character in Roslyn build root directory name, since Roslyn's 'Restore.cmd' script uses old school '%~dp0' thing in statement 'set RoslynRoot=%~dp0' and it badly supports special path symbols, like exclamation mark in '!roslyn' (exlamation mark got trimmed out from folder name)

#build/Build-All.ps1

@@ -162,7 +162,7 @@ try {
     $sourceRoot = Resolve-Path "$root\source"
     Write-Output "  Source Root:        $sourceRoot"
 
-    $roslynBuildRoot = Ensure-ResolvedPath "$root\!roslyn"
+    $roslynBuildRoot = Ensure-ResolvedPath "$root\roslyn_build_root"
     Write-Output "  Roslyn Build Root:  $roslynBuildRoot"
 
     $sitesBuildRoot = Ensure-ResolvedPath "$root\!sites"
@@ -218,7 +218,7 @@ try {
             $branchFsName = $repositoryName + "-" + ($_ -replace '[/\\:_]', '-')
 
             $siteBuildRoot     = Ensure-ResolvedPath "$sitesBuildRoot\$branchFsName"
-            $roslynBinaryRoot  = Ensure-ResolvedPath "$siteBuildRoot\!roslyn"
+            $roslynBinaryRoot  = Ensure-ResolvedPath "$siteBuildRoot\roslyn_build_root"
             $siteBuildTempRoot = Ensure-ResolvedPath "$siteBuildRoot\!temp"
             $siteCopyRoot      = Ensure-ResolvedPath "$siteBuildRoot\!site"
             

#build/Publish-All.ps1

@@ -60,7 +60,7 @@ try {
         Write-Output "*** $_"
 
         $siteMainRoot   = Resolve-Path $siteMainRoot
-        $siteRoslynRoot = Resolve-Path "$($_.FullName)\!roslyn"        
+        $siteRoslynRoot = Resolve-Path "$($_.FullName)\roslyn_build_root"        
 
         $branchInfo = ConvertFrom-Json ([IO.File]::ReadAllText("$siteRoslynRoot\!BranchInfo.json"))
 

.gitignore

@@ -2,6 +2,7 @@
 \#packages/
 *.user
 \!*
+\roslyn_build_root
 .vs/
 node_modules/
 bin/

Build-All.bat

@@ -1,5 +1,5 @@
 @echo off
-mkdir !roslyn\!tools
-xcopy "%PROGRAMFILES(X86)%\Microsoft SDKs\Windows\v8.1A\bin\NETFX 4.5.1 Tools\ildasm.exe" !roslyn\!tools /Y
+mkdir roslyn_build_root\!tools
+xcopy "%PROGRAMFILES(X86)%\Microsoft SDKs\Windows\v8.1A\bin\NETFX 4.5.1 Tools\ildasm.exe" roslyn_build_root\!tools /Y
 
 powershell "Set-ExecutionPolicy RemoteSigned Process; .\#build\Build-All.ps1"