[CMake] fixup_bundle: installing multiple executables that depend on the same libraries

[Ben Medina]

Hello all,

My project is sprouting new executables, and the simple use case of
using fixup_bundle is no longer sufficient. At the moment, I have:
1. A Qt-based gui application.
2. A command line application.

Both of these apps share common 3rdparty library dependencies (boost,
Qt, etc.). And I anticipate several more apps in the near future, both
gui and command line.

Simply running fixup_bundle on each app works fine on Windows and
Linux; the executables both end up in the bin directory, and all their
dependent libs get copied there as well. However, on the Mac, things
are more complicated. My GUI app is built as a bundle, so fixup_bundle
copies all dependent libs into the bundle. But the command line app is
dependent on some of those same libs, and I don't want duplicate
copies of them in my installation.

So I'm wondering what the best path forward is. Ultimately, I think I
should be doing something like this:
1. Install all the common 3rdparty library dependencies somewhere out
in /Library/Application Support.
2. Install small wrapper scripts for both apps that set
DYLD_LIBRARY_PATH to point to where the 3rdparty libs are installed,
then launch the app.

Does this sound reasonable? Is it possible with CMake/CPack? If so,
are there any examples of how to do this?

Thanks,
Ben