How to Use Check_prototype_definition In Cmake?

In CMake, the check_prototype_definition function can be used to check whether a function or macro prototype definition is available in the source code. This can be useful for ensuring that the necessary function or macro definitions are present before attempting to build or compile the project.

To use check_prototype_definition, you first need to specify the name of the function or macro prototype that you want to check for. For example, to check for the presence of the foo function prototype, you would use check_prototype_definition("foo").

You can also specify additional arguments, such as the language in which the prototype should be defined (e.g. C, CXX), or additional compiler flags or definitions that should be used when checking for the prototype.

Once you have specified the prototype definition you want to check for, you can use the check_prototype_definition function in an if statement to conditionally include or exclude certain parts of the CMake configuration based on whether the prototype definition is present.

Overall, check_prototype_definition is a useful tool in CMake for ensuring that the necessary function and macro definitions are present in the source code before proceeding with the build process.

How to correctly format the check_prototype_definition command in cmake?

The correct format for using the check_prototype_definition command in CMake is as follows:

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check_prototype_definition(<prototype> <function> <header> <symbol>)

• : The prototype for the function being checked.
• : The name of the function being checked.
• : The header file containing the function prototype.
• : The symbol returned by the compiler if the function is found.

For example, if you wanted to check if the function foo with prototype int foo(int) is defined in the header file foo.h and returns the symbol _foo, you would use the following command:

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check_prototype_definition("int foo(int)" "foo" "foo.h" "_foo")

Note that the check_prototype_definition command is intended to be used with the CheckPrototypeDefinition module, which must be included in your CMakeLists.txt file with the following command:

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include(CheckPrototypeDefinition)

How to use check_prototype_definition with multiple files in cmake?

To use check_prototype_definition with multiple files in CMake, you can create a separate dedicated CMake file that contains the function definitions and use it in your main CMakeLists.txt file.

Here is an example on how to use check_prototype_definition with multiple files:

1. Create a file "functions.cmake" where you define your functions using check_prototype_definition:

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function(check_prototype_definition PROTOTYPE_DEFINITION)
    # Your implementation of check_prototype_definition function here
endfunction()

function(custom_function1)
    # Your implementation of custom_function1 here
endfunction()

function(custom_function2)
    # Your implementation of custom_function2 here
endfunction()

1. In your main CMakeLists.txt file, include the "functions.cmake" file and use the functions defined in it:

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include(functions.cmake)

# Use the check_prototype_definition function
check_prototype_definition(prototype_example)

# Use the custom functions
custom_function1()
custom_function2()

By using this approach, you can keep your main CMakeLists.txt file clean and organized, and easily maintain and reuse your functions across multiple files in your CMake project.

How to use check_prototype_definition with external libraries in cmake?

To use check_prototype_definition with external libraries in CMake, you can follow these steps:

1. First, make sure that the external libraries you want to check for prototype definitions are properly included in your CMake project.
2. Add the header files of the external libraries to the include directories in your CMakeLists.txt file. You can do this using the include_directories command.
3. Use the check_prototype_definition in your CMakeLists.txt file to check for the prototype definitions of the functions in the external libraries. This command checks for a specific prototype definition in the header files of the included libraries.

Here is an example of how you can use check_prototype_definition in your CMakeLists.txt file:

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include(CheckPrototypeDefinition)

check_prototype_definition("void some_library_function();" SOME_LIBRARY_FUNCTION_EXISTS)

if(NOT SOME_LIBRARY_FUNCTION_EXISTS)
    message(FATAL_ERROR "Prototype definition of some_library_function not found in the included libraries.")
endif()

1. Run CMake to generate the build files and compile your project. If the prototype definition of the function in the external library is not found, CMake will display an error message and the compilation will fail.

By following these steps, you can use check_prototype_definition with external libraries in CMake to ensure that the required prototype definitions are present in the included libraries.