Use ResolveProjectReferences target and limit WinMDs passed to mdmerge.exe

[jlaanstra]

This PR fixes a few issues with the way CppWinRT handles project references, that prevent certain project types from not being included in the reference projection or causes duplicate type errors because the winmd ends up being referenced twice:

• When a Runtime Component and a Static Library reference the same NuGet package containing a WinMD file, it will be referenced twice because the WinMD will always be copied to the output folder.
• A CX project referenced by a CppWinRT project won't have it's WinMD included in the reference projection.
• You have to set project to project references to not copy the reference locally in the properties window to prevent duplicate type errors.

To fix those problems I made two changes.

1. Hook into the ResolveProjectReferences target instead of ResolvedLinkLib.
2. Pass the winmds directly to mdmerge, instead of using folders as input.

[jlaanstra]

Seems like I have some whitespace changes that I will revert.

[jlaanstra]

@kennykerr probably want to wait for @Scottj1s to take a look before merging.

[kennykerr]

Yes, Scott will be back in a week. This can wait.

[Scottj1s]

Lots of tweaks (thanks!) - how has this been tested? Both VS 2017 and 2019, with various p2p reference scenarios?

[jlaanstra]

I tested this on the YourPhone solution with 34 projects. It has:

• Static lib -> Nuget package
• Dynamic lib -> NuGet package
• Dynamic lib -> Static lib
• Dynamic lib -> Dynamic lib
• CX -> WinRT
• WinRT -> CX

[Scottj1s]

Great - thank you!

One remaining test scenario - dynamic projects with multiple winmds (see comment)

---

In reply to: 509732892 [](ancestors = 509732892)

[Scottj1s]

great test collateral - just need to point to props/targets in repo instead of using last published Nuget.

I was just discussing with Kenny scripting the creation of something like this from project templates (also testing the VSIX). Seems doable with dotnet CLI, which can create projects, references, etc - but we can do that later.

[Scottj1s]

Looks Good!