I don't know about the targets, but you can get all variables currently
defined for a directory by reading the VARIABLES property, e.g.
get_property(_variables DIRECTORY "${CMAKE_SOURCE_DIR}" PROPERTY VARIABLES)
I use this to dump the variables into a file so I can see with which
variable
Right now I am fighting my way through large amounts of CMake code (actually
working on a ParaView custom application with many own plugins, views, domains,
property widgets etc. etc.), and it is sometimes really not easy not to lose
track completely! Sometimes I am happy to be back into
