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Enable interprocedural optimization for a target.
If set to true, enables interprocedural optimizations if they are
known :module:`to be supported <CheckIPOSupported>` by the compiler. Depending
on value of policy :policy:`CMP0069`, the error will be reported or ignored,
if interprocedural optimization is enabled but not supported.
This property is initialized by the
:variable:`CMAKE_INTERPROCEDURAL_OPTIMIZATION` variable if it is set when a
target is created.