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Help: Document target_compile_definitions handling of -D

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Add an example of using the `target_compile_definitions` command and a
note about usage of ``-D`` in items.
This commit is contained in:
Ruslan Baratov
2018-03-20 17:13:41 +03:00
committed by Brad King
parent 5831b6a2ae
commit 3af1daa186
1 changed files with 10 additions and 0 deletions
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Help/command/target_compile_definitions.rst
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@@ -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