To unset a CMake property, you can use the UNSET command followed by the name of the property you want to unset. For example, if you want to unset the property MY_PROPERTY, you can use the command UNSET(MY_PROPERTY). This will remove the property from the CMake cache and reset it to its default value. If the property was previously set with a value, unsetting it will revert it to its default behavior.
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What is the impact of unsetting a cmake property on the overall CMake project?
Unsetting a CMake property can have a significant impact on the overall CMake project, depending on which property is being unset.
Some potential impacts of unsetting a CMake property include:
- Changing the behavior of a target or build rule: Certain properties define how a target or build rule is processed or executed. Unsetting these properties can change the behavior of the target or rule, potentially leading to unexpected results or errors.
- Modifying compiler or linker settings: Properties related to compiler or linker settings can affect how your code is compiled or linked. Unsetting these properties can result in different compiler flags being used, potentially impacting the performance or functionality of your project.
- Removing dependencies: Some properties define dependencies between targets or files. Unsetting these properties can remove these dependencies, potentially breaking the build process or resulting in missing or incomplete output files.
It is important to carefully consider the implications of unsetting a CMake property and to test the changes thoroughly before incorporating them into your project.
How to disable a cmake property for a specific file?
To disable a specific property for a specific file in CMake, you can use the set_source_files_properties command with the PROPERTIES option. Here's an example of how you can disable a property for a specific file:
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set_source_files_properties(my_file.cpp PROPERTIES COMPILE_FLAGS "")
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In this example, my_file.cpp is the specific file for which you want to disable the COMPILE_FLAGS property. By setting the property to an empty string, you effectively disable it for that file.
You can also use this approach to disable other properties for specific files in your CMake project. Just replace COMPILE_FLAGS with the name of the property you want to disable.
How to revert a cmake property to its default setting?
To revert a CMake property to its default setting, you can use the cmake_policy(SET) command.
Here's an example of how you can revert the property CXX_STANDARD to its default setting:
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cmake_policy(SET CMP0072 NEW)
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This command sets the CMake policy to the default behavior for a specific property, which in this case is CMP0072.
Alternatively, you can also explicitly set the property to its default value. For example, to revert the CXX_STANDARD property to its default value, you can use the following command:
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set_property(TARGET <target_name> PROPERTY CXX_STANDARD)
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Replace <target_name> with the name of your target. This command will set the CXX_STANDARD property for the specified target to its default value.
Overall, using either cmake_policy(SET) or set_property command will help you revert a CMake property to its default setting.
What is the behavior of CMake when unsetting a property that is not set?
When unsetting a property that is not set in CMake, there will be no error or warning message. CMake will simply ignore the unset command and continue with the rest of the script. This is because CMake's property system allows for flexibility in setting and unsetting properties, and it does not require that all properties be explicitly set before being unset.
