Are the three "make XXX_workspace" just placeholders?

[Scott Chamberlain]

In "$(SRC_ROOT)/Makefile" there is three examples at the bottom of the file
that show up when you do "make help"

169:    $(info     make eclipse_workspace  # Create an Eclipse workspace)
170:    $(info     make netbeans_workspace # Create a NetBeans workspace)
171:    $(info     make vs_workspace       # Create a Visual Studio
workspace)

However none of those 3 build choices are defined anywhere in the make
file, nor in "$(SPEC)" or "$(SRC_ROOT)/common/make/MakeBase.gmk"

Are those 3 commented lines just placeholders and the three builds is going
to be implemented in the future, or is it a part of a idea that started
that has been abandoned and was never removed?