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-rw-r--r--Help/prop_dir/COMPILE_DEFINITIONS_CONFIG.rst11
1 files changed, 10 insertions, 1 deletions
diff --git a/Help/prop_dir/COMPILE_DEFINITIONS_CONFIG.rst b/Help/prop_dir/COMPILE_DEFINITIONS_CONFIG.rst
index 0876ddf..c22606b 100644
--- a/Help/prop_dir/COMPILE_DEFINITIONS_CONFIG.rst
+++ b/Help/prop_dir/COMPILE_DEFINITIONS_CONFIG.rst
@@ -3,6 +3,15 @@ COMPILE_DEFINITIONS_<CONFIG>
Per-configuration preprocessor definitions in a directory.
-This is the configuration-specific version of COMPILE_DEFINITIONS.
+This is the configuration-specific version of :prop_dir:`COMPILE_DEFINITIONS`
+where ``<CONFIG>`` is an upper-case name (ex. ``COMPILE_DEFINITIONS_DEBUG``).
+
This property will be initialized in each directory by its value in
the directory's parent.
+
+Contents of ``COMPILE_DEFINITIONS_<CONFIG>`` 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.
+
+Generator expressions should be preferred instead of setting this property.