[CMake] Object library build fails due to missing include folder from linked interface library

[Dustyn Blasig]

Hi All,

I have a component similar to this setup ...

  project(foo LANGUAGES CXX CUDA)

  add_library(foo INTERFACE)
  target_include_directories(foo INTERFACE <foo_dir>)

  add_library(bar OBJECT bar.cu)
  target_link_libraries(bar PUBLIC foo)

When building *bar*, there is no "-I <foo_dir>" in the command line fed to
nvcc and the needed headers are therefore not available. I only see this
issue with object libraries.

I've tried using PRIVATE and INTERFACE instead of PUBLIC when defining the
link library specification for *bar *with no luck.

I'm trying to figure out if this is supposed to work, or a known limitation.

Thanks!
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