yaml-cpp-config.cmake.in: apply patch to fix #774

[Artturin]

From #774 (comment)

[jbeder]

Can you add a test that confirms this fixes the issue?

[Artturin]

i do not know cpp

i was updating the rstudio package for nixpkgs and i got this error during configuring

CMake Error at src/cpp/CMakeLists.txt:222 (message):
  yaml-cpp not found (re-run dependencies script to install)

and applying the patch in this pr to yaml-cpp fixed it

  patches = [
    # https://github.com/jbeder/yaml-cpp/issues/774
    (fetchpatch {
      url = "https://github.com/jbeder/yaml-cpp/commit/4f48727b365962e31451cd91027bd797bc7d2ee7.patch";
      sha256 = "sha256-jarZAh7NgwL3xXzxijDiAQmC/EC2WYfNMkYHEIQBPhM=";
    })
  ];

[jspricke]

Suggested change

	get_target_property(YAML_CPP_LIBRARIES yaml-cpp IMPORTED_LOCATION_RELEASE)
	set(YAML_CPP_LIBRARIES "yaml-cpp")

note that this only works with CMAKE_BUILD_TYPE=Release. As the value is static anyhow we could just set it.

[jbeder]

It sounds like this is important to get submitted, but I don't understand it. @Artturin, I think what you're trying to fix is an installation step, right?

If so, can you add a case to the github action: https://github.com/jbeder/yaml-cpp/blob/master/.github/workflows/build.yml

If there's a bash command you can run that does the thing you want, that would help ensure this fixes the issue and nothing breaks it down the road.

[Artturin]

better solution in #1077