If i start a dotnet build with a local dotnet.exe, the build uses the one specified in the path to find the C# or F# compiler.

[KevinRansom]

I have installed a global dotnet/cli.

when I use a locally installed dotnet cli to build a dotnetsdk it uses the globally installed dotnetcl compilers instead of the local one.

When I run this command:

c:\microsoft\visualfsharp\Tools\dotnet20\dotnet.exe build /v:normal

I expect it to use the compilers and tools from this location: c:\microsoft\visualfsharp\Tools\dotnet20\

Instead it uses this location: C:\Program Files\dotnet\sdk\2.0.2-vspre-006949

Below is the build log that demonstrates this:

c:\microsoft\visualfsharp\Tools\dotnet20\dotnet.exe build /v:normal
Build started 9/28/2017 11:21:38 AM.
     1>Project "c:\temp\csrepro\csrepro.csproj" on node 1 (Restore target(s)).
     1>Restore:
         Committing restore...
         Assets file has not changed. Skipping assets file writing. Path: c:\temp\csrepro\obj\project.assets.json
         Restore completed in 26.54 ms for c:\temp\csrepro\csrepro.csproj.

         NuGet Config files used:
             C:\Users\kevinr.REDMOND\AppData\Roaming\NuGet\NuGet.Config
             C:\Program Files (x86)\NuGet\Config\Microsoft.VisualStudio.Offline.config

         Feeds used:
             C:\Program Files (x86)\Microsoft SDKs\NuGetPackages\
             C:\Users\kevinr.REDMOND\.dotnet\NuGetFallbackFolder
             https://api.nuget.org/v3/index.json
     1>Done Building Project "c:\temp\csrepro\csrepro.csproj" (Restore target(s)).

Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:00:00.80
Microsoft (R) Build Engine version 15.3.409.57025 for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

Build started 9/28/2017 11:21:39 AM.
     1>Project "c:\temp\csrepro\csrepro.csproj" on node 1 (Build target(s)).
     1>GenerateTargetFrameworkMonikerAttribute:
       Skipping target "GenerateTargetFrameworkMonikerAttribute" because all output files are up-to-date with respect to the input files.
       CoreCompile:
         C:\Program Files\dotnet\sdk\2.0.2-vspre-006949\Roslyn\RunCsc.cmd /noconfig /unsafe- /checked- /nowarn:1701,1702,1705,1701,1702 /nostdlib+ /errorreport:prompt /warn:4 /define:TRACE;DEBUG;NETCOREAPP2_0 /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\Microsoft.CSharp.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\Microsoft.VisualBasic.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\Microsoft.Win32.Primitives.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\mscorlib.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\netstandard.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\System.AppContext.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\System.Buffers.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\System.Collections.Concurrent.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\System.Collections.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\System.Collections.Immutable.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\System.Collections.NonGeneric.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\System.Collections.Specialized.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\System.ComponentModel.Annotations.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\System.ComponentModel.Composition.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\System.ComponentModel.DataAnnotations.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\System.ComponentModel.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\System.ComponentModel.EventBasedAsync.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\System.ComponentModel.Primitives.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\System.ComponentModel.TypeConverter.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\System.Configuration.dll 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/reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\System.Xml.XPath.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\System.Xml.XPath.XDocument.dll /reference:C:\Users\kevinr.REDMOND\.nuget\packages\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\WindowsBase.dll /debug+ /debug:portable /filealign:512 /nologo /optimize- /out:obj\Debug\netcoreapp2.0\csrepro.dll /target:exe /warnaserror- /utf8output /deterministic+ Program.cs "C:\Users\kevinr.REDMOND\AppData\Local\Temp\.NETCoreApp,Version=v2.0.AssemblyAttributes.cs" obj\Debug\netcoreapp2.0\csrepro.AssemblyInfo.cs /warnaserror+:NU1605
       CopyFilesToOutputDirectory:
         Copying file from "obj\Debug\netcoreapp2.0\csrepro.dll" to "bin\Debug\netcoreapp2.0\csrepro.dll".
         csrepro -> c:\temp\csrepro\bin\Debug\netcoreapp2.0\csrepro.dll
         Copying file from "obj\Debug\netcoreapp2.0\csrepro.pdb" to "bin\Debug\netcoreapp2.0\csrepro.pdb".
     1>Done Building Project "c:\temp\csrepro\csrepro.csproj" (Build target(s)).

Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:00:03.43

[tannergooding]

@KevinRansom, Is there an existing mechanism used to determine where the F# compiler/tasks are loaded from?

The C#/VB compilers have special properties that control this and allow things such as the toolset compiler NuGet package to exist. It also allows the compiler consumed from VS for design time builds to be overridden and for the compiler used by the dotnet executable to be overridden.

[KevinRansom]

This is a C# repro :-)

[tannergooding]

Tagging @khyperia

[tannergooding]

As I understand it, this PR contains the fix: dotnet/cli#7311

[eerhardt]

By default, if you don't explicitly specify an sdk version in a global.json, the SDK used will be the highest version installed across:

1. The 'sdk' folder next to the dotnet.exe being executed
2. The %PROGRAMFILES%\dotnet\sdk folder

You can opt out of this behavior by setting

$env:DOTNET_MULTILEVEL_LOOKUP = '0'

There is a lot of literature on this behavior:

https://github.com/dotnet/cli/issues/5896
https://github.com/dotnet/core-setup/issues/1664
dotnet/core-setup#1568

[eerhardt]

To verify it isn't just using the Roslyn from %PROGRAMFILES%, but instead it is loading the whole .NET Core SDK from %PROGRAMFILES%, you can type

c:\microsoft\visualfsharp\Tools\dotnet20\dotnet.exe --info

And the output will tell you the version of the SDK and where it is running from.

[nguerrera]

I replied on an offline email from @KevinRansom about this with similar info to @eerhardt's posts above. I think what you're seeing is indeed multi level lookup. If so, it's orthogonal to the problems around CscToolPath, but we need to solve those too for separate reasons and @khyperia's changes should indeed fix them.

[KevinRansom]

thanks for the info: DOTNET_MULTILEVEL_LOOKUP = '0' looks like it may be my friend.