Issue with dependency propagation for object libraries

[kennyweiss]

There might be a bug with how blt_add_library propagates dependencies for object libraries. My specific case is for an object library that depends on an imported library with its own internal dependencies.

Specifically, I have an axom configuration that depends on RAJA with RAJA_ENABLE_ROCTX = ON.

• The RAJA import has a RAJA target that depends on the RAJA::roctx target.
• Axom's core component is an object library. When invoking blt_add_library, it gets the RAJA dependency, but does not eventually get include paths from RAJA::roctx

Details and links:

• RAJA_ENABLE_ROCTX option: https://github.com/LLNL/RAJA/blob/093bc446fdde333749a13ceca262c09ca3ad1049/cmake/SetupRajaOptions.cmake#L12
• Axom's setup for the core component: https://github.com/LLNL/axom/blob/1f86e245684480c1d9bcfe88f50011b0bb280e6d/src/axom/core/CMakeLists.txt#L96-L116
• Partial dependency setup for object libraries in blt_add_library: https://github.com/LLNL/blt/blob/8c229991e65e7a9603c621b47cb3ba158bb7468c/cmake/BLTMacros.cmake#L635-L646
• More dependency setup in blt_add_library: https://github.com/LLNL/blt/blob/8c229991e65e7a9603c621b47cb3ba158bb7468c/cmake/BLTMacros.cmake#L691-L693
• Possibly relevant: blt_expand_dependencies only applies to (pseudo)-targets created by blt_register_library: https://github.com/LLNL/blt/blob/8c229991e65e7a9603c621b47cb3ba158bb7468c/cmake/BLTPrivateMacros.cmake#L329-L339
• Temporary workaround in axom: https://github.com/LLNL/axom/pull/1002