Bug 55579 - error MSB4064: The "SkipCompilerExecution" parameter is not supported by the "Fsc" task.
Summary: error MSB4064: The "SkipCompilerExecution" parameter is not supported by the ...
Alias: None
Product: Tools
Classification: Mono
Component: msbuild ()
Version: 5.0 (2017-02)
Hardware: PC Mac OS
: High critical
Target Milestone: 15.2
Assignee: Ankit Jain
Depends on:
Reported: 2017-04-25 17:53 UTC by Kyle White
Modified: 2017-04-28 13:24 UTC (History)
3 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Kyle White 2017-04-25 17:53:07 UTC
It looks like we cannot compile .NET Core F# apps with mono `msbuild`

Steps to reproduce:
1) `dotnet new console -lang F# -n HelloWorld`
2) `cd HelloWorld`
3) `msbuild /t:Restore HelloWorld.fsproj`
4) `msbuild /t:Build HelloWorld.fsproj`

"/Users/kylewhite/deleteme/HelloWorld/HelloWorld.fsproj" (Build target) (1) ->
(CoreCompile target) ->
  /Users/kylewhite/.nuget/packages/fsharp.net.sdk/1.0.2/build/FSharp.NET.Core.Sdk.targets(210,15): error MSB4064: The "SkipCompilerExecution" parameter is not supported by the "Fsc" task. Verify the parameter exists on the task, and it is a settable public instance property. [/Users/kylewhite/deleteme/HelloWorld/HelloWorld.fsproj]
  /Users/kylewhite/.nuget/packages/fsharp.net.sdk/1.0.2/build/FSharp.NET.Core.Sdk.targets(170,9): error MSB4063: The "Fsc" task could not be initialized with its input parameters.  [/Users/kylewhite/deleteme/HelloWorld/HelloWorld.fsproj]

Diagnostic restore and build logs: https://gist.github.com/kdubau/d4177b9eed5647889c058d1b2dea2d5b

Mono JIT compiler version (2017-02/1434f9c Tue Apr 25 05:54:09 EDT 2017)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
	TLS:           normal
	SIGSEGV:       altstack
	Notification:  kqueue
	Architecture:  x86
	Disabled:      none
	Misc:          softdebug
	LLVM:          yes(3.6.0svn-mono-master/8b1520c)
	GC:            sgen (concurrent by default)
Comment 1 Ankit Jain 2017-04-26 05:29:34 UTC
This is blocked on https://github.com/dotnet/netcorecli-fsc/issues/96 .
Matt Ward suggests that for now you have to change the FSharp.NET.Sdk package reference to 1.0.1 .
@Matt, any idea when they plan to fix this?
Comment 2 Matt Ward 2017-04-26 08:12:07 UTC
I guess we need to update the F# compiler that ships with Mono to support the SkipCompilerExecution parameter. Whether that is going to happen for 15.2 is another question.

Whilst the project here was created with dotnet new, VS for Mac has the same problem since it is using the same templates that have:

 <PackageReference Include="FSharp.NET.Sdk" Version="1.0.*" PrivateAssets="All" />

Which currently means the 1.0.2 FSharp.NET.Sdk NuGet package is used.

The current workaround is just to change this to use 1.0.1:

<PackageReference Include="FSharp.NET.Sdk" Version="1.0.1" PrivateAssets="All" />

On the VS for Mac side a short term fix may be to create custom project templates for F# and set the FSharp.NET.Sdk version to 1.0.1 so they work out of the box.
Comment 3 Matt Ward 2017-04-26 11:05:18 UTC
We should probably mark this as an upstream bug since it is not something we can fix in Mono's MSBuild. It is a bug in the FSharp.Compiler.Tools:


Mono's F# compiler is not used.

The only workaround is to edit the .fsproj and change the FSharp.NET.Sdk to target 1.0.1.
Comment 5 Matt Ward 2017-04-27 15:53:36 UTC
This has been fixed in the FSharp.NET.Sdk 1.0.3 NuGet package.
Comment 6 Kyle White 2017-04-28 13:24:14 UTC
It working for me with the new package. Verified