Unable to build any package due to invalid path to vcpkg (missing platform in triplet name)

[pistecid]

Describe the bug
Unable to build a project which uses any vcpkg library due to incorrect path to vcpkg headers/libs

Environment

• OS: Windows
• Visual Studio 2015

To Reproduce
Steps to reproduce the behavior:

1. Clone vcpkg, build it
2. Install any package
3. Make integrate install
4. Run visual studio, create empty project, try to use the package (e.g. include some header)

Expected behavior
No errors during compilation

Additional context
It looks like the problem is in $(VCPKG_ROOT)\scripts\buildsystems\msbuild\vcpkg.targets.
The default $(VcpkgUserTriplet) is initialized as $(PlatformTarget)-$(VcpkgOSTarget). In solution $(PlatformTarget) seems to be empty when usertriplet is calculated. The workaround is to specify $(VcpkgPlatformTarget) variable ( the same way it is defined in vcpkg.props) and use it instead of $(PlatformTarget)

[aggieNick02]

This is one of the other "odd behaviors" I saw in issue #12062 . It is somehow caused by commit 1451450 .

What is even more odd/interesting is that this doesn't always happen in VS2015. I think it may be dependent upon VS2015 bugfix version, as I see it in VS2015 version 14.0.25425.01 Update 3, but not in VS2015 version 14.0.25431.01 Update 3. The former defaults the triplet to $(PlatformTarget)-$(VcpkgOSTarget), while the latter defaults to $(VcpkgPlatformTarget)-$(VcpkgOSTarget).

I don't know how to bugfix upgrade a VS2015 install (running the latest VS2015 Update 3 installer just told me the update was already installed). As a workaround, you could try figuring out how to install the bugfix update (perhaps just remove then reinstall VS2015 Update 3 with the latest installer), or you can clone vcpkg and then checkout before the problematic commit with

git checkout 14514508d8d30bdbd645b2bec89696aec25497f1~1

from the root directory before building it.

[JackBoosY]

@BillyONeal @Neumann-A Could you take a look?

Thanks.

[JackBoosY]

Close this issue via #12257 merged.