To declare a function-like macro using CMake, you can use the define_property function provided by CMake. This function allows you to define custom properties for targets or source files in your CMake project.
To declare a function-like macro, you can use the following syntax:
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function(my_macro target_name) set_property(TARGET ${target_name} PROPERTY MY_MACRO true) endfunction() |
In this example, my_macro is the name of the function-like macro, and target_name is the name of the target to which the macro will be applied. Inside the function, the set_property function is used to set a custom property named MY_MACRO to true for the specified target.
You can then use this custom property in your CMakeLists.txt file to control the behavior of the target using the macro.
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my_macro(my_target) if(TARGET my_target) message("MY_MACRO is enabled for target my_target") endif() |
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How to call a function-like macro in CMake?
To call a function-like macro in CMake, you can use the get_filename_component command.
Here's an example of calling a function-like macro in CMake:
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# Define a function-like macro macro(my_function_like_macro ARG) message("Hello from my_function_like_macro with argument: ${ARG}") endmacro() # Call the function-like macro my_function_like_macro("test argument") |
In this example, the my_function_like_macro macro is defined with an argument ARG. The message command within the macro will print the argument passed to the macro. To call the macro, you simply use its name followed by the argument in parentheses.
What is the default behavior of a function-like macro in CMake?
In CMake, a function-like macro is defined using the macro() command and can be called with arguments like a regular function. The default behavior of a function-like macro is to expand the macro definition when it is called, replacing any arguments with the values provided at the call site. This allows the macro to perform a series of operations or generate code based on the provided arguments.
If no arguments are provided when calling the macro, the macro will still be expanded but the arguments will be empty or not used in the macro definition. The behavior can be customized by writing the macro definition to handle cases where no arguments are provided.
Overall, the default behavior of a function-like macro in CMake is to expand the macro definition and replace any arguments with the values provided at the call site.
How to define a macro in CMake?
In CMake, you can define a macro using the macro() command. Here is an example of how to define a simple macro in CMake:
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macro(my_macro my_argument) message("Hello from my macro with argument: ${my_argument}") endmacro() |
You can then use this macro in your CMake script by calling it like a function:
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my_macro("foo")
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This will output "Hello from my macro with argument: foo" when you run CMake. You can also pass multiple arguments to a macro and use them within the macro definition.
Keep in mind that macros defined with macro() are like functions and can only be called within the CMakeLists.txt where they are defined. If you want to make a macro available globally or across multiple CMakeLists, you can use the include() command to include a CMake script that defines the macros you need.
