Help: Clarify INTERFACE_SYSTEM_INCLUDE_DIRECTORIES documentation.
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@ -7,8 +7,15 @@ Targets may populate this property to publish the include directories
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which contain system headers, and therefore should not result in
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which contain system headers, and therefore should not result in
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compiler warnings. The :command:`target_include_directories(SYSTEM)`
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compiler warnings. The :command:`target_include_directories(SYSTEM)`
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command signature populates this property with values given to the
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command signature populates this property with values given to the
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``PUBLIC`` and ``INTERFACE`` keywords. Projects may also get and set the
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``PUBLIC`` and ``INTERFACE`` keywords.
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property directly.
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Projects may also get and set the property directly, but must be aware that
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adding directories to this property does not make those directories used
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during compilation. Adding directories to this property marks directories
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as ``SYSTEM`` which otherwise would be used in a non-``SYSTEM`` manner. This
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can appear similar to 'duplication', so prefer the
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high-level :command:`target_include_directories(SYSTEM)` command and avoid
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setting the property by low-level means.
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When target dependencies are specified using :command:`target_link_libraries`,
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When target dependencies are specified using :command:`target_link_libraries`,
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CMake will read this property from all target dependencies to mark the
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CMake will read this property from all target dependencies to mark the
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