From c32e2a5969555bacccb20189180cfb64f4645fb4 Mon Sep 17 00:00:00 2001
From: Ajay Bhargav Baaskaran <ajaybhargavb@gmail.com>
Date: Thu, 15 Aug 2019 14:42:21 -0700
Subject: [PATCH] Set LangVersion the same way as roslyn
 (dotnet/aspnetcore-tooling#978)

* Set LangVersion the same way as roslyn

* Update commit link
\n\nCommit migrated from https://github.com/dotnet/aspnetcore-tooling/commit/7da15da123077cf4b52398c949c6aa6aaee2b9ee
---
 .../Microsoft.NET.Sdk.Razor.Compilation.targets        | 10 +++++-----
 .../Microsoft.NET.Sdk.Razor.Component.targets          |  6 ------
 2 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/Microsoft.NET.Sdk.Razor.Compilation.targets b/src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/Microsoft.NET.Sdk.Razor.Compilation.targets
index bba60c4553..c74674d432 100644
--- a/src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/Microsoft.NET.Sdk.Razor.Compilation.targets
+++ b/src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/Microsoft.NET.Sdk.Razor.Compilation.targets
@@ -13,7 +13,7 @@ Copyright (c) .NET Foundation. All rights reserved.
 <Project ToolsVersion="14.0">
   <!--
   What follows in this file is based on:
-     https://github.com/dotnet/roslyn/blob/db4f836b97db1e7ad261e51c67cc80c6f3c28791/src/Compilers/Core/MSBuildTask/Microsoft.CSharp.Core.targets
+     https://github.com/dotnet/roslyn/blob/21263069b7e8522441d829fc59a3aa5b3a3cf938/src/Compilers/Core/MSBuildTask/Microsoft.CSharp.Core.targets
 
   We need to keep this basically up to date, as well as track the set of modifications we've made. Try to keep the formatting
   similar to the original to reduce noise. In general try to only deviate from the CoreCompile target when we need to for
@@ -111,10 +111,10 @@ Copyright (c) .NET Foundation. All rights reserved.
       <UseSharedCompilation>true</UseSharedCompilation>
     </PropertyGroup>
 
-    <PropertyGroup>
-      <LangVersion Condition="'$(LangVersion)' == '' AND
-        (('$(TargetFrameworkIdentifier)' == '.NETCoreApp' AND '$(TargetFrameworkVersion)' == 'v3.0') OR
-         ('$(TargetFrameworkIdentifier)' == '.NETStandard' AND '$(TargetFrameworkVersion)' == 'v2.1'))">preview</LangVersion>
+    <PropertyGroup Condition="('$(TargetFrameworkIdentifier)' != '.NETCoreApp' OR '$(TargetFrameworkVersion)' != 'v3.0') AND
+                            ('$(TargetFrameworkIdentifier)' != '.NETStandard' OR '$(TargetFrameworkVersion)' != 'v2.1')">
+      <MaxSupportedLangVersion Condition="'$(MaxSupportedLangVersion)' == ''">7.3</MaxSupportedLangVersion>
+      <LangVersion Condition="'$(LangVersion)' == ''">$(MaxSupportedLangVersion)</LangVersion>
     </PropertyGroup>
 
     <Csc
diff --git a/src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/Microsoft.NET.Sdk.Razor.Component.targets b/src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/Microsoft.NET.Sdk.Razor.Component.targets
index 73fb23e194..18e39122e2 100644
--- a/src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/Microsoft.NET.Sdk.Razor.Component.targets
+++ b/src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/Microsoft.NET.Sdk.Razor.Component.targets
@@ -180,12 +180,6 @@ Copyright (c) .NET Foundation. All rights reserved.
       <UseSharedCompilation>true</UseSharedCompilation>
     </PropertyGroup>
 
-    <PropertyGroup>
-      <LangVersion Condition="'$(LangVersion)' == '' AND
-        (('$(TargetFrameworkIdentifier)' == '.NETCoreApp' AND '$(TargetFrameworkVersion)' == 'v3.0') OR
-         ('$(TargetFrameworkIdentifier)' == '.NETStandard' AND '$(TargetFrameworkVersion)' == 'v2.1'))">8.0</LangVersion>
-    </PropertyGroup>
-
     <Csc
          AdditionalLibPaths="$(AdditionalLibPaths)"
          AddModules="@(AddModules)"