COMPILE_DEFINITIONS

Preprocessor definitions for compiling a directory's sources.

This property specifies the list of options given so far to the :command:add_compile_definitions (or :command:add_definitions) command.

The COMPILE_DEFINITIONS property may be set to a semicolon-separated list of preprocessor definitions using the syntax VAR or VAR=value. Function-style definitions are not supported. CMake will automatically escape the value correctly for the native build system (note that CMake language syntax may require escapes to specify some values).

This property will be initialized in each directory by its value in the directory's parent.

CMake will automatically drop some definitions that are not supported by the native build tool.

.. versionadded:: 3.26 Any leading -D on an item will be removed.

.. include:: /include/COMPILE_DEFINITIONS_DISCLAIMER.rst

Contents of COMPILE_DEFINITIONS may use "generator expressions" with the syntax $<...>. See the :manual:cmake-generator-expressions(7) manual for available expressions. See the :manual:cmake-buildsystem(7) manual for more on defining buildsystem properties.

The corresponding :prop_dir:COMPILE_DEFINITIONS_<CONFIG> property may be set to specify per-configuration definitions. Generator expressions should be preferred instead of setting the alternative property.