It would be nice to extend the current properties set of LINK_LIBRARIES and
INTERFACE_LINK_LIBRARIES with a property to obtain actually all transitive
linked libraries of a specific target. Currently you will have to traverse
yourself over all targets to get in CMake a full overview of all linked
libraries. This information should already be present internally to write out
accordingly all the generator files accordingly. I do understand the fact that
this information is only fully available during generation time. Would you be
open for such extension point or is there are already one maybe?
For example:
add_library(Library1 library1.cpp)
target_link_libraries(Library1 PRIVATE Library2 PUBLIC Library3)
add_library(Library2 SHARED library2.cpp)
add_library(Library3 SHARED library3.cpp)
add_library(Library4 SHARED library4.cpp)
target_link_libraries(Library4 PRIVATE Library1 PUBLIC Library2)
get_target_property(ALL_DEPENDENCIES1 Library1 LINK_LIBRARIES)
get_target_property(ALL_DEPENDENCIES2 Library2 LINK_LIBRARIES)
get_target_property(ALL_DEPENDENCIES3 Library3 LINK_LIBRARIES)
get_target_property(ALL_DEPENDENCIES4 Library4 LINK_LIBRARIES)
get_target_property(INTERFACE_DEPENDENCIES1 Library1 INTERFACE_LINK_LIBRARIES)
get_target_property(INTERFACE_DEPENDENCIES2 Library2 INTERFACE_LINK_LIBRARIES)
get_target_property(INTERFACE_DEPENDENCIES3 Library3 INTERFACE_LINK_LIBRARIES)
get_target_property(INTERFACE_DEPENDENCIES4 Library4 INTERFACE_LINK_LIBRARIES)
message("All dependencies of Library1 are: ${ALL_DEPENDENCIES1}")
message("All dependencies of Library2 are: ${ALL_DEPENDENCIES2}")
message("All dependencies of Library3 are: ${ALL_DEPENDENCIES3}")
message("All dependencies of Library4 are: ${ALL_DEPENDENCIES4}")
message("Interface dependencies of Library1 are: ${INTERFACE_DEPENDENCIES1}")
message("Interface dependencies of Library2 are: ${INTERFACE_DEPENDENCIES2}")
message("Interface dependencies of Library3 are: ${INTERFACE_DEPENDENCIES3}")
message("Interface dependencies of Library4 are: ${INTERFACE_DEPENDENCIES4}")
That would result in:
All dependencies of Library1 are: Library2;Library3
All dependencies of Library2 are: ALL_DEPENDENCIES2-NOTFOUND
All dependencies of Library3 are: ALL_DEPENDENCIES3-NOTFOUND
All dependencies of Library4 are: Library1;Library2
Interface dependencies of Library1 are: $<LINK_ONLY:Library2>;Library3
Interface dependencies of Library2 are: INTERFACE_DEPENDENCIES2-NOTFOUND
Interface dependencies of Library3 are: INTERFACE_DEPENDENCIES3-NOTFOUND
Interface dependencies of Library4 are: Library2
It would be nice to request with a property for example from target Library4
all its linked libraries (i.e. the actual linker line), so in the example case
you would get then Library1, Library2, Library3.
--
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