The answer is related to how your projects are set up and if you use EDE. EDE - Emacs Development Envornment (an IDE game), and how CEDET keeps track of which files belong to your project. This limiter is associated with both productivity (finding less material) and preventing the configuration of one project bleeding into another.
, Maven CEDET/EDE. , , ede-cpp-root ( ++) . , java.
EDE GNU Global (. GNU Global EDE, Semantic), GTAGS .
-1 -2, GTAGS -1, . GTAGS EDE .
, GTAGS, , , EDE, GTAGS.
cedet-devel , .