CMAKE_INTERPROCEDURAL_OPTIMIZATION
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Cmake/docs/3.21/variable/cmake interprocedural optimization
CMAKE_INTERPROCEDURAL_OPTIMIZATION
New in version 3.9.
Default value for INTERPROCEDURAL_OPTIMIZATION of targets.
This variable is used to initialize the INTERPROCEDURAL_OPTIMIZATION property on all the targets. See that target property for additional information.
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https://cmake.org/cmake/help/v3.21/variable/CMAKE_INTERPROCEDURAL_OPTIMIZATION.html