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How to Disable A Cmake Option?

4 minutes read

To disable a cmake option, you can either remove the option from the CMakeLists.txt file or set the option to OFF when configuring your build. If the option is defined as a variable in the CMakeLists.txt file, you can simply comment out or delete the line that sets the variable. If the option is defined as a CMake cache variable, you can use the cmake -DOPTION=OFF command when configuring your build to explicitly set the option to OFF. This will disable the option for the current build.


What is the syntax for disabling a cmake option?

To disable a CMake option, you can use the option command in CMake by setting the value of the option to OFF. Here is an example:

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option(DISABLE_FEATURE "Disable feature" OFF)


This will set the DISABLE_FEATURE option to OFF, effectively disabling it.


You can also use an if statement to conditionally disable a feature based on another option. Here is an example:

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if(OTHER_OPTION)
  set(DISABLE_FEATURE OFF)
else()
  set(DISABLE_FEATURE ON)
endif()


This will disable the DISABLE_FEATURE option if OTHER_OPTION is set, and enable it otherwise.


How to disable a cmake option using the CMake GUI?

To disable a CMake option using the CMake GUI, follow these steps:

  1. Open the CMake GUI interface.
  2. Find the option that you want to disable in the list of CMake options.
  3. Uncheck the checkbox or toggle button next to the option to disable it.
  4. Click on the "Configure" button to re-run the CMake configuration process and apply the changes.
  5. Once the configuration is complete, click on the "Generate" button to generate the build files with the option disabled.
  6. Build your project using the generated build files.


By following these steps, you can easily disable a CMake option using the CMake GUI interface.


How to disable a cmake option in a subdirectory?

To disable a CMake option in a subdirectory, you can set the option to FALSE before calling the parent CMakeLists.txt file. Here is an example:

  1. In the subdirectory CMakeLists.txt file, set the option to FALSE before including the parent CMakeLists.txt file.
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set(DISABLE_OPTION OFF) # set the option to FALSE
include(${CMAKE_CURRENT_SOURCE_DIR}/../CMakeLists.txt)


  1. In the parent CMakeLists.txt file, check if the DISABLE_OPTION is TRUE before enabling the option.
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option(OPTION_NAME "Enable Option" ON)

if(DISABLE_OPTION)
    set(OPTION_NAME OFF)
endif()

# Use the OPTION_NAME in your project


By following these steps, you can effectively disable a CMake option in a specific subdirectory.


What is the best practice for communicating the decision to disable a cmake option to the project team?

The best practice for communicating the decision to disable a CMake option to the project team is to be transparent and provide a clear explanation for why the option is being disabled. The team should be informed of the reasons behind the decision, any potential implications for the project, and any alternative solutions or workarounds that may be available.


It is also important to involve relevant team members in the decision-making process and solicit feedback before finalizing the decision. This can help ensure that all perspectives are taken into account and that the team is on board with the decision.


Additionally, the communication should be clear and concise, with all necessary information provided in a timely manner. It may be helpful to hold a team meeting or send out an email to ensure that all team members are aware of the decision and any next steps that need to be taken.


Overall, open and honest communication is key when communicating a decision to disable a CMake option to the project team. This can help ensure that team members understand the reasoning behind the decision and can work together to find the best solution for the project.


How to troubleshoot issues after disabling a cmake option?

  1. Check for syntax errors or typos in the CMakeLists.txt file where the option was disabled. Make sure that the option is correctly commented out or removed.
  2. Verify that the option was properly disabled by checking the build log or output. Look for any warning or error messages related to the disabled option.
  3. Rebuild the project to ensure that the changes made to the CMakeLists.txt file are correctly applied. Use a clean build to make sure that there are no leftover artifacts from previous builds that could be causing issues.
  4. If the issue persists after rebuilding, try reverting the changes made to disable the option and rebuild the project again to see if the problem is resolved. This can help identify if the issue is related to the disabled option.
  5. Check for any dependencies or other configurations that may be impacted by disabling the option. Make sure that all necessary dependencies are still properly linked and included in the build.
  6. Consult the CMake documentation or project-specific documentation to see if there are any specific considerations or steps to take when disabling a particular option.
  7. If the issue remains unresolved, try reaching out to the project's community or support channels for further assistance. Provide details about the specific issue and what steps have been taken to troubleshoot it.


What is the command to disable a cmake option?

To disable a CMake option, you can use the following command:

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cmake -D<option_name>=OFF <path_to_source>


Replace <option_name> with the name of the option you want to disable and <path_to_source> with the path to your source code directory. Using OFF as the value for the option will effectively disable it.

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