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- HEADER_FILE_ONLY
- ----------------
- Is this source file only a header file.
- A property on a source file that indicates if the source file is a
- header file with no associated implementation. This is set
- automatically based on the file extension and is used by CMake to
- determine if certain dependency information should be computed.
- By setting this property to ``ON``, you can disable compilation of
- the given source file, even if it should be compiled because it is
- part of the library's/executable's sources.
- This is useful if you have some source files which you somehow
- pre-process, and then add these pre-processed sources via
- :command:`add_library` or :command:`add_executable`. Normally, in IDE,
- there would be no reference of the original sources, only of these
- pre-processed sources. So by setting this property for all the original
- source files to ``ON``, and then either calling :command:`add_library`
- or :command:`add_executable` while passing both the pre-processed
- sources and the original sources, or by using :command:`target_sources`
- to add original source files will do exactly what would one expect, i.e.
- the original source files would be visible in IDE, and will not be built.
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