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add_compile_definitions
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-----------------------
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Add preprocessor definitions to the compilation of source files.
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.. code-block:: cmake
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add_compile_definitions(<definition> ...)
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Adds preprocessor definitions to the compiler command line.
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The preprocessor definitions are added to the :prop_dir:`COMPILE_DEFINITIONS`
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directory property for the current ``CMakeLists`` file. They are also added to
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the :prop_tgt:`COMPILE_DEFINITIONS` target property for each target in the
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current ``CMakeLists`` file.
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Definitions are specified using the syntax ``VAR`` or ``VAR=value``.
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Function-style definitions are not supported. CMake will automatically
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escape the value correctly for the native build system (note that CMake
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language syntax may require escapes to specify some values).
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Arguments to ``add_compile_definitions`` may use "generator expressions" with
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the syntax ``$<...>``. See the :manual:`cmake-generator-expressions(7)`
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manual for available expressions. See the :manual:`cmake-buildsystem(7)`
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manual for more on defining buildsystem properties.
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