Hi, we have several projects setup where the main target has a dependency on a 
smaller target and the smaller target’s executable gets copied into the main 
target’s OS X app bundle. We’ve been doing this with a combination of getting 
the target’s LOCATION property and making that path a source of the main target 
and setting its MACOSX_PACKAGE_LOCATION property.

However with CMake 3’s policy change we’re trying to replace usage of this. 
Unfortunately it looks like we have to now use add_custom_command() and 
$<TARGET_FILE:…>. This works, but I’m wondering if there’s a better way to 
accomplish what I’m after? It’d be great if CMake had some command that takes 
generator expressions but places targets into a bundle. We don’t use the 
“install” targets as we need the bundles to be setup with the executables for 
debugging.

Also it’d be very hand to have a generator expression to get the target’s 
bundle folder. To do that now we have to use "$<TARGET_FILE_DIR:${TARGET}>/..” 
but it’d be nice and clean to have something like $<TARGET_BUNDLE:…>

Thanks,
Kevin

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