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Add docs for compile_definitions with no value #3551

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Jan 30, 2024
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Add docs for compile_definitions with no value #3551

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6 changes: 4 additions & 2 deletions reference/tools/cmake/cmaketoolchain.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -153,12 +153,14 @@ This attribute allows defining compiler preprocessor definitions, for multiple c
tc.preprocessor_definitions["MYDEF"] = "MyValue"
tc.preprocessor_definitions.debug["MYCONFIGDEF"] = "MyDebugValue"
tc.preprocessor_definitions.release["MYCONFIGDEF"] = "MyReleaseValue"
# Setting to None will add the definition with no value
tc.preprocessor_definitions["NOVALUE_DEF"] = None
tc.generate()

This will be translated to:

- One ``add_definitions()`` definition for ``MYDEF`` in ``conan_toolchain.cmake`` file.
- One ``add_definitions()`` definition, using a cmake generator expression in ``conan_toolchain.cmake`` file,
- One ``add_compile_definitions()`` definition for ``MYDEF`` in ``conan_toolchain.cmake`` file.
- One ``add_compile_definitions()`` definition, using a cmake generator expression in ``conan_toolchain.cmake`` file,
using the different values for different configurations.

.. _conan-cmake-toolchain-cache_variables:
Expand Down