Bug 14922 - xBuild fails to parse F# 3.1 project files
Summary: xBuild fails to parse F# 3.1 project files
Alias: None
Product: Tools
Classification: Mono
Component: xbuild ()
Version: unspecified
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2013-09-23 05:40 UTC by Gustavo Guerra
Modified: 2013-11-14 10:05 UTC (History)
2 users (show)

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

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Description Gustavo Guerra 2013-09-23 05:40:47 UTC
F# 3.0 projects files had an import like this:

<Import Project="$(MSBuildExtensionsPath32)\..\Microsoft SDKs\F#\3.0\Framework\v4.0\Microsoft.FSharp.Targets" Condition=" Exists('$(MSBuildExtensionsPath32)\..\Microsoft SDKs\F#\3.0\Framework\v4.0\Microsoft.FSharp.Targets')" />

but F# 3.1 project files have this instead:

  <When Condition="'$(VisualStudioVersion)' == '11.0'">
      <FSharpTargetsPath>$(MSBuildExtensionsPath32)\..\Microsoft SDKs\F#\3.0\Framework\v4.0\Microsoft.FSharp.Targets</FSharpTargetsPath>
    <PropertyGroup>      <FSharpTargetsPath>$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)\FSharp\Microsoft.FSharp.Targets</FSharpTargetsPath>

<Import Project="$(FSharpTargetsPath)" Condition="Exists('$(FSharpTargetsPath)')" />

This is failing because $(FSharpTargetsPath) is not correctly replaced in the Import Project tag.
Comment 1 Mikayla Hutchinson [MSFT] 2013-09-23 18:31:25 UTC
So the targets depend on the VisualStudioVersion property having a value?
Comment 2 Gustavo Guerra 2013-09-23 18:37:23 UTC
If VisualStudioVersion doesn't have a value, the condition turns to '' == '11.0' so the Otherwise case is the valid one. So I was expecting FSharpTargetsPath to be set to $(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)\FSharp\Microsoft.FSharp.Targets, but it's set to "" and InvalidProjectFileException is thrown in mcs/class/Microsoft.Build.Engine/Microsoft.Build.BuildEngineImport.cs, line 221
Comment 3 Gustavo Guerra 2013-09-25 16:55:05 UTC
This applies to a project upgraded from VS2012 to VS2013. For a F# project created directly in VS2013, there's more stuff that needs to be fixed :(
*>= in Conditions
Comment 4 Gustavo Guerra 2013-09-25 17:35:29 UTC
VS2013 also includes a new ImportGroup tag that groups several Imports under a condition
Comment 5 Gustavo Guerra 2013-09-25 18:12:41 UTC
I've submitted a pull request with a fix: https://github.com/mono/mono/pull/767
Comment 6 Gustavo Guerra 2013-11-14 10:05:00 UTC
The pull request for this has been merged and according to @kumpera will be released in 3.2.5