[CMake] Generator expression $<TARGET_OBJECTS:objLib> in add_custom_command()

[Kukosa Tomáš]

Hi,

would it be possible and useful to support the TARGET_OBJECTS also in 
the add_custom_command() context (COMMAND and DEPENDS options)?

What I need is to build list of objects and than process them by custom 
command.

Best regards,
   Tomas