New in version 3.9.
Default value for INTERPROCEDURAL_OPTIMIZATION_<CONFIG> of targets.
This variable is used to initialize the INTERPROCEDURAL_OPTIMIZATION_<CONFIG> property on all the targets. See that target property for additional information.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/variable/CMAKE_INTERPROCEDURAL_OPTIMIZATION_CONFIG.html