[release/7.0] Target only net7.0 during source-build (#75168)

* Target net7.0 in additional projects

* Update compatibility suppressions

* Only target net7.0 for source-build

* Revert "Update compatibility suppressions"

This reverts commit 2975185.

* Disable package validation for source-build

* Revert compatibility suppression changes

* Use NetCoreAppCurrent instead of hardcoding net7.0

* Revert mono Apple TFM change

* Remove unnecessary LangVersion

Author: lbussell

Directory.Build.props

@@ -54,6 +54,7 @@
     <NetCoreAppCurrentBrandName>.NET $(NetCoreAppCurrentVersion)</NetCoreAppCurrentBrandName>
     <NetCoreAppCurrent>net$(NetCoreAppCurrentVersion)</NetCoreAppCurrent>
     <NetCoreAppMinimum>net6.0</NetCoreAppMinimum>
+    <NetCoreAppMinimum Condition="'$(DotNetBuildFromSource)' == 'true'">$(NetCoreAppCurrent)</NetCoreAppMinimum>
 
     <NetCoreAppToolCurrentVersion>7.0</NetCoreAppToolCurrentVersion>
     <NetCoreAppToolCurrent>net$(NetCoreAppToolCurrentVersion)</NetCoreAppToolCurrent>

eng/SourceBuild.props

@@ -39,6 +39,7 @@
       <InnerBuildArgs>$(InnerBuildArgs) /p:PortableBuild=$(SourceBuildPortable)</InnerBuildArgs>
       <InnerBuildArgs>$(InnerBuildArgs) /p:BuildDebPackage=false</InnerBuildArgs>
       <InnerBuildArgs>$(InnerBuildArgs) /p:EnableNgenOptimization=false</InnerBuildArgs>
+      <InnerBuildArgs>$(InnerBuildArgs) /p:EnablePackageValidation=false</InnerBuildArgs>
     </PropertyGroup>
   </Target>
 

src/libraries/System.Diagnostics.DiagnosticSource/src/System.Diagnostics.DiagnosticSource.csproj

@@ -6,8 +6,6 @@
     <NoWarn>$(NoWarn);SA1205;CA1845</NoWarn>
     <EnableTrimAnalyzer Condition="$([MSBuild]::GetTargetFrameworkIdentifier('$(TargetFramework)')) == '.NETFramework'">false</EnableTrimAnalyzer>
     <IsPackable>true</IsPackable>
-    <!-- Lifetime rules introduced in C# 11 impact scenarios in net6 framework -->
-    <LangVersion Condition="'$(TargetFramework)' == 'net6.0'">10</LangVersion>
     <EnableAOTAnalyzer>true</EnableAOTAnalyzer>
     <PackageDescription>Provides Classes that allow you to decouple code logging rich (unserializable) diagnostics/telemetry (e.g. framework) from code that consumes it (e.g. tools)
 

src/libraries/System.Text.RegularExpressions/tools/GenerateRegexCasingTable.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
       <OutputType>Exe</OutputType>
-      <TargetFramework>net6.0</TargetFramework>
+      <TargetFramework>$(NetCoreAppToolCurrent)</TargetFramework>
       <LangVersion>latest</LangVersion>
       <Nullable>enable</Nullable>
   </PropertyGroup>