[capnproto] Add Capnproto package

[tarcila]

Add a new CapnProto package. Tested on Windows and Linux (Ubuntu 18.10).
The embedded patch as also been submitted upstream (capnproto/capnproto#804)

[msftclas]

All CLA requirements met.

[Rastaban]

This can be moved into the PATCHES argument to vcpkg_from_github

[tarcila]

👍

[Rastaban]

This is looking good so far. It looks like the uwp failures are expected so those can be ignored. I also see failures arm64-windows is that expected?

[tarcila]

This is looking good so far. It looks like the uwp failures are expected so those can be ignored.

Yes, for uwp, the code relies on some LoadLibrary calls, so this is a no go.

I also see failures arm64-windows is that expected?

Not sure about this one. I can't seem to have access to build logs. Anything you can share?
The original website does make mention of C++11 compatibility, a quick search did not bring more details.

[tarcila]

I have pushed an updated version that address PATCHES comment, plus some cmake related cleanups.

Once #5630 is merged, this should make the vcpkg_test_cmake() statement work correctly on currently broken Linux and OSX.

[Rastaban]

With the latest commit I see failures on everything except x86-windows.

Starting package 2/2: capnproto:x64-windows
Building package capnproto[core]:x64-windows... 
Could not locate cached archive: C:\vsts\_work\1\s\archives\b3\b3fd7d6ae526f020b8ca476d47d0431257398d86.zip
Building DLLs not supported. Building static instead.
-- Downloading https://github.com/capnproto/capnproto/archive/v0.7.0.tar.gz...
-- Extracting source C:/vsts/_work/1/s/downloads/capnproto-capnproto-v0.7.0.tar.gz
-- Applying patch C:/vsts/_work/1/s/ports/capnproto/0001-fix-capnpc-extension-handling-on-Windows.patch
-- Using source at C:/vsts/_work/1/s/buildtrees/capnproto/src/v0.7.0-b4a52715c4
-- Configuring x64-windows
-- Building x64-windows-dbg
-- Building x64-windows-rel
-- Performing CMake integration test
CMake Error at scripts/cmake/vcpkg_test_cmake.cmake:56 (message):
  CMake integration test failed; unable to find_package(CapnProto CONFIG
  REQUIRED)
Call Stack (most recent call first):
  ports/capnproto/portfile.cmake:39 (vcpkg_test_cmake)
  scripts/ports.cmake:71 (include)


Error: Building package capnproto:x64-windows failed with: BUILD_FAILED
Elapsed time for package capnproto:x64-windows: 3.784 min

Log files:
capmproto_2484052.zip

[tarcila]

Thanks for the logs. Most of the failures are for now expected, waiting for a few fixes:

• Make sure vcpkg_test_cmake uses the correct generator #5635: CMake integration test is broken on 64 bits builds when the default CMake generator is 32 bits, hence the broken x64-windows build
• [scripts] Fix vcpkg_fixup_cmake on non Windows platforms #5630: CMake targets declaration is broken for non Windows platform (binaries are moved to the tools/ folder, but Targets.cmake is not correctly updated), again breaking the CMake integration test

Checking for the logs, arm64 failures seem related to upstream code being incompatible with the target platform (__popcnt intrinsic)

[tarcila]

@Rastaban I can remove the cmake integration test from the package. That would make the package fully functional, but only on Windows (x86 and x64). Would it be an acceptable solution?

It would later on be fixed on Linux and OSX when #5630 is integrated and cmake integration test could be added back once #5635 is fixed.

[Rastaban]

@tarcila that sounds good to me. Having it in and functional for some architectures is more useful than none.