[CMake] Help with fixup_bundle for Mac OS - @executable_path, @loader_path, @rpath

[Scott Fowler]

I have an application "Foo" which distributes a plugin for a separate application "Bar".  My plugin is dependent on libraries distributed with application "Foo".  When application "Bar" tries to load the plugin, the plugin will not load, as it cannot find the libraries distributed with "Foo".

As far as I can tell this boils down to the @executable_path reference which fixup_bundle inserts into my binaries.

>otool -L plugin.dylib
@executable_path/../MacOS/libsomedependency.dylib
@executable_path/../MacOS/libsomeotherdependency.dylib
etc...

When application "Bar" loads my plugin, I'm assuming that @executable_path resolves to the location of "Bar", but the plugin's dependent libraries are in Foo.app/Contents/MacOS, not in Bar.app/Contents/MacOS.

All this leads me to believe that I should be using @loader_path or @rpath instead, but I don't see a way to do this using CMake as it appears that BundleUtilities.cmake and GetPrerequisites.cmake are hardcoded to use @executable_path.

Any advice would be greatly appreciated.

Thanks!
Scott

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