Find libraries after building with multi-configuration CMake generator

[dancsi]

I am trying to build CxxWrap using Visual Studio 2019. I am following the instructions from their README and everything goes more or less smoothly:

mkdir libcxxwrap-julia-build
cd libcxxwrap-julia-build
cmake -DJulia_PREFIX=C:\Dev\Julia -DJulia_EXECUTABLE=julia ..\libcxxwrap-julia
cmake --build . --config Release

I can verify that the resulting DLLs have been placed under libcxxwrap-julia-build/bin/Release. The CMAKE_RUNTIME_OUTPUT_DIRECTORY was just libcxxwrap-julia-build/bin/, but the CMake docs state that multi-config generators such as Visual Studio and Xcode create a separate subdirectory for each config (ie Debug or Release).

The problem occurs when I try to rebuild CxxWrap to use the binaries I just built:

julia> ENV["JLCXX_DIR"] = "C:\\Dev\\projects\\CxxWrap.jl\\libcxxwrap-julia-build"
"C:\\Dev\\projects\\CxxWrap.jl\\libcxxwrap-julia-build"

(v1.1) pkg> build CxxWrap
  Building CxxWrap → `C:\Users\danie\.julia\packages\CxxWrap\sarOk\deps\build.log`
┌ Error: Error building `CxxWrap`:
│ ┌ Warning: On Windows, creating file symlinks requires Administrator privileges
│ └ @ Base.Filesystem file.jl:794
│ ERROR: LoadError: The libcxxwrap-julia library was not found in the provided JLCXX_DIR directory C:\Dev\projects\CxxWrap.jl\libcxxwrap-julia-build
│ Stacktrace:
│  [1] error(::String) at .\error.jl:33
│  [2] top-level scope at C:\Users\danie\.julia\packages\CxxWrap\sarOk\deps\build.jl:50
│  [3] include at .\boot.jl:326 [inlined]
│  [4] include_relative(::Module, ::String) at .\loading.jl:1038
│  [5] include(::Module, ::String) at .\sysimg.jl:29
│  [6] include(::String) at .\client.jl:403
│  [7] top-level scope at none:0
│ in expression starting at C:\Users\danie\.julia\packages\CxxWrap\sarOk\deps\build.jl:31
└ @ Pkg.Operations C:\cygwin\home\Administrator\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.1\Pkg\src\Operations.jl:1075

From what I understood, the problem happens because the LibraryProduct doesn't specify its dir_path, so the dir_path filled by BinaryProvider is just libcxxwrap-julia-build/bin/, and thus the library search fails.

[dancsi]

On a second thought, maybe I am not using BinaryProvider correctly, since once I install CxxWrap to some prefix (cmake --install .), the DLLs are found and the package is built without any issues.