CMake/Help/variable/CMAKE_EXTRA_GENERATOR.rst

CMAKE_EXTRA_GENERATOR
---------------------

The extra generator used to build the project.

When using the Eclipse, CodeBlocks or KDevelop generators, CMake
generates Makefiles (CMAKE_GENERATOR) and additionally project files
for the respective IDE.  This IDE project file generator is stored in
CMAKE_EXTRA_GENERATOR (e.g.  "Eclipse CDT4").