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Does anyone know a simple way to apply the "include once" pattern in CMake files? In C/C++ it used to require a #ifdef / #endif pair in the beginning and end of the header file until #pragma once became common. Of course, it's possible to do the same in CMake, but I thought it'd be nice if it didn't require an explicit conditional statement.
Re-edition: It seems that the return() command should do it. And I'd define a macro like this:
macro(include_once)
if (INCLUDED_${CMAKE_CURRENT_LIST_FILE})
return()
endif()
set(INCLUDED_${CMAKE_CURRENT_LIST_FILE} true)
endmacro()
Use the macro in the beginning of your file, without any arguments. Because it's a macro, the return is from the include command for the file, not from the macro itself.
Notice that the created variable has an odd name, but CMake seems to accept this.
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cmake is searched first in CMAKE_MODULE_PATH , then in the CMake module directory. There is one exception to this: if the file which calls include() is located itself in the CMake builtin module directory, then first the CMake builtin module directory is searched and CMAKE_MODULE_PATH afterwards.
To include headers in CMake targets, use the command target_include_directories(...) . Depending on the purpose of the included directories, you will need to define the scope specifier – either PUBLIC , PRIVATE or INTERFACE .
CMakeLists files can be edited in almost any text editor. Some editors, such as Notepad++, come with CMake syntax highlighting and indentation support built-in.
I used to use the logic that others have suggested as the solution. Then I learned that cmake has this functionality built in.
Take a look at include_guard(). I believe this will do what you want.
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