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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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COMPILE_DEFINITIONS
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-------------------
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Preprocessor definitions for compiling a target's sources.
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The COMPILE_DEFINITIONS property may be set to a semicolon-separated
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list of preprocessor definitions using the syntax VAR or VAR=value.
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Function-style definitions are not supported. CMake will
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automatically escape the value correctly for the native build system
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(note that CMake language syntax may require escapes to specify some
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values). This property may be set on a per-configuration basis using
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the name COMPILE_DEFINITIONS_<CONFIG> where <CONFIG> is an upper-case
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name (ex. "COMPILE_DEFINITIONS_DEBUG").
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CMake will automatically drop some definitions that are not supported
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by the native build tool. The VS6 IDE does not support definition
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values with spaces (but NMake does).
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Contents of COMPILE_DEFINITIONS may use "generator expressions" with the
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syntax "$<...>". See the :manual:`cmake-generator-expressions(7)` manual
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for available expressions.
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.. include:: /include/COMPILE_DEFINITIONS_DISCLAIMER.txt
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