New in version 3.6.
This cache variable is used by the Eclipse project generator. See cmake-generators(7).
If this variable is set to TRUE, the Eclipse project generator will generate an Eclipse project in CMAKE_SOURCE_DIR . This project can then be used in Eclipse e.g. for the version control functionality. CMAKE_ECLIPSE_GENERATE_SOURCE_PROJECT defaults to FALSE; so nothing is written into the source directory.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/variable/CMAKE_ECLIPSE_GENERATE_SOURCE_PROJECT.html