The extra generator used to build the project. See cmake-generators(7).
When using the Eclipse, CodeBlocks, CodeLite, Kate or Sublime 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).
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/variable/CMAKE_EXTRA_GENERATOR.html