From 906ce37a35427fee4df40c039dbe9ba74c0d9604 Mon Sep 17 00:00:00 2001
From: "Kraemer, Benjamin" <benjamin.kraemer@jungheinrich.de>
Date: Tue, 5 May 2020 14:42:17 +0200
Subject: [PATCH] Improved folder generation

---
 .../build/_protobuf/Google.Protobuf.Tools.targets         | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/csharp/Grpc.Tools/build/_protobuf/Google.Protobuf.Tools.targets b/src/csharp/Grpc.Tools/build/_protobuf/Google.Protobuf.Tools.targets
index 40c5d5bd3dc..8b286593647 100644
--- a/src/csharp/Grpc.Tools/build/_protobuf/Google.Protobuf.Tools.targets
+++ b/src/csharp/Grpc.Tools/build/_protobuf/Google.Protobuf.Tools.targets
@@ -259,9 +259,11 @@
           Condition=" '$(DisableProtobufDesignTimeBuild)' != 'true' "
           DependsOnTargets="Protobuf_PrepareCompileOptions;_Protobuf_GatherStaleFiles">
     <!-- Ensure output directories. -->
-    <MakeDir Directories="%(_Protobuf_OutOfDateProto.OutputDir)" />
-    <MakeDir Directories="%(_Protobuf_OutOfDateProto.GrpcOutputDir)" />
-    <MakeDir Directories="%(Protobuf_ExpectedOutputs.RelativeDir)" />
+    <ItemGroup>
+      <_Protobuf_ExpectedGenerated Include="@(Protobuf_ExpectedOutputs)"
+				Condition = " '%(Source)' != '' and '@(_Protobuf_OutOfDateProto)' != '' " />
+    </ItemGroup>
+    <MakeDir Directories="%(_Protobuf_ExpectedGenerated.RelativeDir)" />
     <MakeDir Directories="$(Protobuf_DepFilesPath)" />
 
     <!-- Force output to the current directory if the user has set it to empty. -->