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How to Unset A Variable In Cmake Using Command Line?

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To unset a variable in CMake using the command line, you can use the -U flag followed by the variable name. For example, to unset a variable named MY_VARIABLE, you can use the command cmake -UMY_VARIABLE. This will remove the variable from the CMake cache, essentially unsetting it. This can be useful when you want to reset a variable to its default value or remove it entirely from the build configuration.


How to ensure successful unsetting of a variable in cmake using the command line?

To ensure successful unsetting of a variable in CMake using the command line, you can follow these steps:

  1. Use the -U flag followed by the variable name to unset a variable in CMake. For example, to unset a variable named MY_VAR, you can run the following command: cmake -U MY_VAR .
  2. Make sure that the variable you are unsetting is defined in the CMakeLists.txt file or the cache file. If the variable is not defined, the unset command may not have any effect.
  3. Check the CMake output for any error messages or warnings that may indicate issues with unsetting the variable. If there are no error messages, the variable should be successfully unset.
  4. Verify that the variable has been successfully unset by checking the CMake cache file (CMakeCache.txt) or by running the cmake -LA command to list all cached variables.


By following these steps, you can ensure successful unsetting of a variable in CMake using the command line.


How can I clear a variable value in cmake using the command line?

To clear a variable value in CMake using the command line, you can use the -U option followed by the variable name. Here is the syntax for clearing a variable value in CMake:

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cmake -U <variable_name> /path/to/source


Replace <variable_name> with the name of the variable you want to clear, and /path/to/source with the path to your CMake project directory. This will remove the previously set value for the specified variable and reset it to an empty value.


How to remove a variable assignment in cmake through the command line?

To remove a variable assignment in CMake through the command line, you can use the -U option followed by the variable name. Here's an example:

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cmake -U my_variable


This command will remove the assignment of the variable my_variable from the CMake cache.


How do I delete a variable value in cmake from the command line?

To delete a variable value in CMake from the command line, you can use the -U flag followed by the variable name.


For example, if you want to delete the value of a variable named MY_VARIABLE, you can do the following:

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cmake -U MY_VARIABLE


This will remove the value assigned to the MY_VARIABLE variable, but the variable itself will still exist. If you want to completely remove the variable, you can use the unset command in your CMakeLists.txt file:

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unset(MY_VARIABLE CACHE)


Place this line in your CMakeLists.txt file before the variable is used so that it will not be set during the CMake configuration process.

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