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macOS: include weak dependencies in GetPrerequisites and file(GET_RUNTIME_DEPENDENCIES)

Bianca van Schaik requested to merge bvschaik/cmake:bugfix/macos-include-weak-dependencies into master

On macOS, it's possible to weakly link to libraries and frameworks using the -weak_library and -weak_framework linker flags. Those weakly linked libraries are considered optional and can be absent at runtime.

Starting with Clang 12, `otool` output differs for these weakly linked libraries/frameworks:

Output of otool -L:

Clang 11:

        @rpath/libtestlib.dylib (compatibility version 0.0.0, current version 0.0.0)

Clang 12:

        @rpath/libtestlib.dylib (compatibility version 0.0.0, current version 0.0.0, weak)

Output of otool -l:

Clang 11:

Load command 13
          cmd LC_LOAD_DYLIB
      cmdsize 48
         name @rpath/libtestlib.dylib (offset 24)
   time stamp 2 Thu Jan  1 01:00:02 1970
      current version 0.0.0
compatibility version 0.0.0

Clang 12:

Load command 13
          cmd LC_LOAD_WEAK_DYLIB
      cmdsize 48
         name @rpath/libtestlib.dylib (offset 24)
   time stamp 2 Thu Jan  1 01:00:02 1970
      current version 0.0.0
compatibility version 0.0.0

Both GetPrerequisites (used by BundleUtilities) and file(GET_RUNTIME_DEPENDENCIES) didn't take these changes into account.

Fixes: #21684 (closed)
Backport: release
Topic-rename: macos-include-weak-dependencies

Edited by Brad King

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