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-rw-r--r--Help/command/target_compile_definitions.rst10
1 files changed, 10 insertions, 0 deletions
diff --git a/Help/command/target_compile_definitions.rst b/Help/command/target_compile_definitions.rst
index 3709e7a..a740117 100644
--- a/Help/command/target_compile_definitions.rst
+++ b/Help/command/target_compile_definitions.rst
@@ -27,3 +27,13 @@ Arguments to ``target_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.
+
+Any leading ``-D`` on an item will be removed. Empty items are ignored.
+For example, the following are all equivalent:
+
+.. code-block:: cmake
+
+ target_compile_definitions(foo PUBLIC FOO)
+ target_compile_definitions(foo PUBLIC -DFOO) # -D removed
+ target_compile_definitions(foo PUBLIC "" FOO) # "" ignored
+ target_compile_definitions(foo PUBLIC -D FOO) # -D becomes "", then ignored