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Generator expressions are supported in many places and are a distinct concept worthy of their own manual page. The old builtin documentation was previously represented by preprocessor macros to generate it into each place that supports them. Factor out the duplicate content into a dedicated cmake-generator-expressions manual page and reference it from each original location.
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INCLUDE_DIRECTORIES
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-------------------
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List of preprocessor include file search directories.
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This property specifies the list of directories given so far to the
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include_directories command. This property exists on directories and
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targets. In addition to accepting values from the include_directories
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command, values may be set directly on any directory or any target
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using the set_property command. A target gets its initial value for
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this property from the value of the directory property. A directory
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gets its initial value from its parent directory if it has one. Both
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directory and target property values are adjusted by calls to the
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include_directories command.
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The target property values are used by the generators to set the
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include paths for the compiler. See also the include_directories
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command.
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Contents of INCLUDE_DIRECTORIES may use "generator expressions" with the
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syntax "$<...>". See the :manual:`cmake-generator-expressions(7)` manual for
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available expressions.
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