Build FSI and FSC using AppHost

FSharpTests.Directory.Build.props

@@ -22,12 +22,12 @@
     <FscToolPath>$([System.IO.Path]::GetDirectoryName('$(DOTNET_HOST_PATH)'))</FscToolPath>
     <FscToolExe Condition="'$(OS)' != 'Unix'">dotnet.exe</FscToolExe>
     <FscToolExe Condition="'$(OS)' == 'Unix'">dotnet</FscToolExe>
-    <DotnetFscCompilerPath>$(MSBuildThisFileDirectory)artifacts\bin\fsc\$(Configuration)\netcoreapp3.1\fsc.exe</DotnetFscCompilerPath>
+    <DotnetFscCompilerPath>$(MSBuildThisFileDirectory)artifacts\bin\fsc\$(Configuration)\netcoreapp3.1\fsc.dll</DotnetFscCompilerPath>
 
     <FsiToolPath>$([System.IO.Path]::GetDirectoryName('$(DOTNET_HOST_PATH)'))</FsiToolPath>
     <FsiToolExe Condition="'$(OS)' != 'Unix'">dotnet.exe</FsiToolExe>
     <FsiToolExe Condition="'$(OS)' == 'Unix'">dotnet</FsiToolExe>
-    <DotnetFsiCompilerPath>$(MSBuildThisFileDirectory)artifacts\bin\fsi\$(Configuration)\netcoreapp3.1\fsi.exe</DotnetFsiCompilerPath>
+    <DotnetFsiCompilerPath>$(MSBuildThisFileDirectory)artifacts\bin\fsi\$(Configuration)\netcoreapp3.1\fsi.dll</DotnetFsiCompilerPath>
   </PropertyGroup>
 
   <!-- SDK targets override -->

eng/Build.ps1

@@ -186,7 +186,7 @@ function Update-Arguments() {
             $script:bootstrap = $True
         }
     } else {
-        if (-Not (Test-Path "$ArtifactsDir\Bootstrap\fsc\fsc.exe") -or (Test-Path "$ArtifactsDir\Bootstrap\fsc\fsc.runtimeconfig.json")) {
+        if (-Not (Test-Path "$ArtifactsDir\Bootstrap\fsc\fsc.dll") -or (Test-Path "$ArtifactsDir\Bootstrap\fsc\fsc.runtimeconfig.json")) {
             $script:bootstrap = $True
         }
     }

src/buildtools/AssemblyCheck/AssemblyCheck.fs

@@ -15,35 +15,52 @@ module AssemblyCheck =
     let private devVersionPattern = new Regex(@"-(ci|dev)", RegexOptions.Compiled)
 
     let verifyEmbeddedPdb (filename:string)  =
-        use fileStream = File.OpenRead(filename)
-        let reader = new PEReader(fileStream)
-        let mutable hasEmbeddedPdb = false
-
-        try
-            for entry in reader.ReadDebugDirectory() do
-                match entry.Type with
-                | DebugDirectoryEntryType.CodeView ->
-                    let _ = reader.ReadCodeViewDebugDirectoryData(entry)
-                    ()
-
-                | DebugDirectoryEntryType.EmbeddedPortablePdb ->
-                    let _ = reader.ReadEmbeddedPortablePdbDebugDirectoryData(entry)
-                    hasEmbeddedPdb <- true
-                    ()
-
-                | DebugDirectoryEntryType.PdbChecksum ->
-                    let _ = reader.ReadPdbChecksumDebugDirectoryData(entry)
-                    ()
-
-                | _ -> ()
-        with | e -> printfn "Error validating assembly %s\nMessage: %s" filename (e.ToString())
-        hasEmbeddedPdb
+        let isManagedDll =
+            try
+                // Is il assembly? throws if not
+                let _ = AssemblyName.GetAssemblyName(filename).Version
+                true
+            with
+            | :? System.BadImageFormatException -> false       // uninterested in embedded pdbs for native dlls
+
+        if isManagedDll then
+            use fileStream = File.OpenRead(filename)
+            let reader = new PEReader(fileStream)
+            let mutable hasEmbeddedPdb = false
+
+            try
+                for entry in reader.ReadDebugDirectory() do
+                    match entry.Type with
+                    | DebugDirectoryEntryType.CodeView ->
+                        let _ = reader.ReadCodeViewDebugDirectoryData(entry)
+                        ()
+
+                    | DebugDirectoryEntryType.EmbeddedPortablePdb ->
+                        let _ = reader.ReadEmbeddedPortablePdbDebugDirectoryData(entry)
+                        hasEmbeddedPdb <- true
+                        ()
+
+                    | DebugDirectoryEntryType.PdbChecksum ->
+                        let _ = reader.ReadPdbChecksumDebugDirectoryData(entry)
+                        ()
+
+                    | _ -> ()
+            with
+            | e -> printfn "Error validating assembly %s\nMessage: %s" filename (e.ToString())
+
+            hasEmbeddedPdb
+        else
+            true
 
     let verifyAssemblies (binariesPath:string) =
 
         let excludedAssemblies =
             [ ] |> Set.ofList
 
+        let maybeNativeExe =
+            [ "fsi.exe"
+              "fsc.exe" ] |> Set.ofList
+
         let fsharpAssemblies =
             [ "FSharp*.dll"
               "fsc.exe"
@@ -63,8 +80,12 @@ module AssemblyCheck =
         let failedVersionCheck =
             fsharpAssemblies
             |> List.filter (fun a ->
-                let assemblyVersion = AssemblyName.GetAssemblyName(a).Version
-                assemblyVersion = versionZero || assemblyVersion = versionOne)
+                try
+                    let assemblyVersion = AssemblyName.GetAssemblyName(a).Version
+                    assemblyVersion = versionZero || assemblyVersion = versionOne
+                with | :? System.BadImageFormatException ->
+                    // fsc.exe and fsi.exe are il on the desktop and native on the coreclr
+                    Set.contains (Path.GetFileName(a)) maybeNativeExe |> not)
 
         if failedVersionCheck.Length > 0 then
             printfn "The following assemblies had a version of %A or %A" versionZero versionOne

src/fsharp/FSharp.Build/Microsoft.FSharp.NetSdk.props

@@ -59,11 +59,11 @@ WARNING:  DO NOT MODIFY this file unless you are knowledgeable about MSBuild and
   <PropertyGroup Condition="'$(DisableAutoSetFscCompilerPath)' != 'true' and '$(DOTNET_HOST_PATH)' != ''">
     <FscToolPath Condition="'$(FscToolPath)' == ''">$([System.IO.Path]::GetDirectoryName($(DOTNET_HOST_PATH)))</FscToolPath>
     <FscToolExe Condition="'$(FscToolExe)' == ''">$([System.IO.Path]::GetFileName($(DOTNET_HOST_PATH)))</FscToolExe>
-    <DotnetFscCompilerPath Condition="'$(DotnetFscCompilerPath)' == ''">"$(MSBuildThisFileDirectory)fsc.exe"</DotnetFscCompilerPath>
+    <DotnetFscCompilerPath Condition="'$(DotnetFscCompilerPath)' == ''">"$(MSBuildThisFileDirectory)fsc.dll"</DotnetFscCompilerPath>
 
     <FsiToolPath Condition="'$(FsiToolPath)' == ''">$([System.IO.Path]::GetDirectoryName($(DOTNET_HOST_PATH)))</FsiToolPath>
     <FsiToolExe Condition="'$(FsiToolExe)' == ''">$([System.IO.Path]::GetFileName($(DOTNET_HOST_PATH)))</FsiToolExe>
-    <DotnetFsiCompilerPath Condition="'$(DotnetFscCompilerPath)' == ''">"$(MSBuildThisFileDirectory)fsi.exe"</DotnetFsiCompilerPath>
+    <DotnetFsiCompilerPath Condition="'$(DotnetFscCompilerPath)' == ''">"$(MSBuildThisFileDirectory)fsi.dll"</DotnetFsiCompilerPath>
   </PropertyGroup>
 
   <ItemGroup Condition="'$(DisableImplicitSystemValueTupleReference)' != 'true'

src/fsharp/Microsoft.FSharp.Compiler/Microsoft.FSharp.Compiler.nuspec

@@ -46,8 +46,8 @@
             this approach gives a very small deployment. Which is kind of necessary.
         -->
         <!-- assemblies -->
-        <file src="fsc\$Configuration$\netcoreapp3.1\fsc.exe"                                             target="lib\netcoreapp3.1" />
-        <file src="fsi\$Configuration$\netcoreapp3.1\fsi.exe"                                             target="lib\netcoreapp3.1" />
+        <file src="fsc\$Configuration$\netcoreapp3.1\fsc.dll"                                             target="lib\netcoreapp3.1" />
+        <file src="fsi\$Configuration$\netcoreapp3.1\fsi.dll"                                             target="lib\netcoreapp3.1" />
         <file src="FSharp.Core\$Configuration$\netstandard2.0\FSharp.Core.dll"                            target="lib\netcoreapp3.1" />
         <file src="FSharp.Core\$Configuration$\netstandard2.0\FSharp.Core.xml"                            target="lib\netcoreapp3.1" />
         <file src="FSharp.Compiler.Private\$Configuration$\netstandard2.0\FSharp.Compiler.Private.dll"    target="lib\netcoreapp3.1" />

src/fsharp/fsc/fsc.fsproj

@@ -7,12 +7,11 @@
     <TargetFrameworks Condition="'$(ProtoTargetFramework)' != ''">$(ProtoTargetFramework)</TargetFrameworks>
     <TargetFrameworks Condition="'$(ProtoTargetFramework)' == ''">net472;netcoreapp3.1</TargetFrameworks>
     <TargetFrameworks Condition="'$(OS)' == 'Unix'">netcoreapp3.1</TargetFrameworks>
-    <TargetExt>.exe</TargetExt>
     <NoWarn>$(NoWarn);45;55;62;75;1204</NoWarn>
     <AllowCrossTargeting>true</AllowCrossTargeting>
     <OtherFlags>$(OtherFlags) --maxerrors:20 --extraoptimizationloops:1</OtherFlags>
     <NGenBinary>true</NGenBinary>
-    <UseAppHost>false</UseAppHost>
+    <UseAppHost>true</UseAppHost>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(TargetFramework)' == 'net472'">

src/fsharp/fsi/fsi.fsproj

@@ -7,13 +7,12 @@
     <TargetFrameworks Condition="'$(ProtoTargetFramework)' != ''">$(ProtoTargetFramework)</TargetFrameworks>
     <TargetFrameworks Condition="'$(ProtoTargetFramework)' == ''">net472;netcoreapp3.1</TargetFrameworks>
     <TargetFrameworks Condition="'$(OS)' == 'Unix'">netcoreapp3.1</TargetFrameworks>
-    <TargetExt>.exe</TargetExt>
     <NoWarn>$(NoWarn);45;55;62;75;1204</NoWarn>
     <AllowCrossTargeting>true</AllowCrossTargeting>
     <OtherFlags>--warnon:1182 --maxerrors:20 --extraoptimizationloops:1</OtherFlags>
     <Win32Resource>fsi.res</Win32Resource>
     <NGenBinary>true</NGenBinary>
-    <UseAppHost>false</UseAppHost>
+    <UseAppHost>true</UseAppHost>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(TargetFramework)' == 'net472'">

tests/FSharp.Test.Utilities/CompilerAssert.fs

@@ -239,7 +239,7 @@ let main argv = 0"""
         let args =
             options
             |> Array.append defaultProjectOptions.OtherOptions
-            |> Array.append [| "fsc.exe"; inputFilePath; "-o:" + outputFilePath; (if isExe then "--target:exe" else "--target:library"); "--nowin32manifest" |]
+            |> Array.append [| "fsc.dll"; inputFilePath; "-o:" + outputFilePath; (if isExe then "--target:exe" else "--target:library"); "--nowin32manifest" |]
         let errors, _ = checker.Compile args |> Async.RunSynchronously
         errors, outputFilePath
 

tests/FSharp.Test.Utilities/TestFramework.fs

@@ -293,13 +293,19 @@ let config configurationName envVars =
         if File.Exists(repoLocalDotnetPath) then repoLocalDotnetPath
         else DOTNET_EXE
 
+#if !NETCOREAPP
     let FSI_PATH = ("fsi" ++ configurationName ++ fsiArchitecture ++ "fsi.exe")
+#else
+    let FSI_PATH = ("fsi" ++ configurationName ++ fsiArchitecture ++ "fsi.dll")
+#endif
     let FSI_FOR_SCRIPTS = requireArtifact FSI_PATH
     let FSI = requireArtifact FSI_PATH
 #if !NETCOREAPP
     let FSIANYCPU = requireArtifact ("fsiAnyCpu" ++ configurationName ++ "net472" ++ "fsiAnyCpu.exe")
-#endif
     let FSC = requireArtifact ("fsc" ++ configurationName ++ fscArchitecture ++ "fsc.exe")
+#else
+    let FSC = requireArtifact ("fsc" ++ configurationName ++ fscArchitecture ++ "fsc.dll")
+#endif
     let FSCOREDLLPATH = requireArtifact ("FSharp.Core" ++ configurationName ++ fsharpCoreArchitecture ++ "FSharp.Core.dll")
 
     let defaultPlatform =