For example: target_include_directories(mylib PUBLIC $ Relative paths should not be used in BUILD_INTERFACE expressions because they will not be converted to absolute. Relative paths are allowed within the INSTALL_INTERFACE expression and are interpreted as relative to the installation prefix. The BUILD_INTERFACE and INSTALL_INTERFACE generator expressions can be used to describe separate usage requirements based on the usage location. Include directories usage requirements commonly differ between the build-tree and the install-tree. If the path starts with a generator expression, it will always be assumed to be an absolute path (with one exception noted below) and will be used unmodified. CMAKE_CURRENT_SOURCE_DIR) and converted to an absolute path before storing it in the associated target property. A relative path will be interpreted as relative to the current source directory (i.e. Specified include directories may be absolute paths or relative paths. See the cmake-buildsystem(7) manual for more on defining buildsystem properties. See the cmake-generator-expressions(7) manual for available expressions. If SYSTEM is used together with PUBLIC or INTERFACE, the INTERFACE_SYSTEM_INCLUDE_DIRECTORIES target property will be populated with the specified directories.Īrguments to target_include_directories may use generator expressions with the syntax $. Additionally, system include directories are searched after normal include directories regardless of the order specified. This may have effects such as suppressing warnings or skipping the contained headers in dependency calculations (see compiler documentation). If SYSTEM is specified, the compiler will be told the directories are meant as system include directories on some platforms. Repeated calls for the same append items in the order called. New in version 3.11: Allow setting INTERFACE items on IMPORTED targets. The following arguments specify include directories. PUBLIC and INTERFACE items will populate the INTERFACE_INCLUDE_DIRECTORIES property of. PRIVATE and PUBLIC items will populate the INCLUDE_DIRECTORIES property of. The INTERFACE, PUBLIC and PRIVATE keywords are required to specify the scope of the following arguments. The named must have been created by a command such as add_executable() or add_library() and must not be an ALIAS target.īy using AFTER or BEFORE explicitly, you can select between appending and prepending, independent of the default. Specifies include directories to use when compiling a given target. I hope this explanation clarifies the concepts and helps you use target_include_directories() effectively in your CMake projects.Īdd include directories to a target. Consider using generator expressions for dynamic paths.Using target_include_directories() for an imported target (use find_package() instead).Don't mix target_include_directories() with include_directories(), as they have different scopes.Overusing SYSTEM might lead to platform-specific issues.Use PUBLIC sparingly to avoid exposing unnecessary dependencies. # Public includes for any consumer using the library target_include_directories(my_program PUBLIC PRIVATE: Only accessible by code within the target itself.Īdd_executable(my_program main.cpp other_file.cpp).PUBLIC: Accessible by other targets that link to this target and also by code within the target itself.INTERFACE: Accessible by other targets that link to this target but not by code within the target itself.: One of INTERFACE, PUBLIC, or PRIVATE, depending on who can access the directories.: Name of the target you want to modify.This tells the compiler where to find header files your code needs during compilation. With the built-in support you have a direct view onto your directory structure, have to bother less about IDE-specific things and can leverage many nice features like presets or faster builds with Ninja.This command adds include directories to a specific target (executable or library) built by CMake. But since Visual Studio has built-in support for CMake since 2015 (IMHO pretty decent one since 2019), I would recommend using that instead of generating solution and project files. for plugins) then once you intend to package/install your artifacts you need to use the $ and $ generator expressions as documented for the target_include_directories() command.įor managing the folder structure of the generated Visual Studio project have a look at the source_group() command. If your building a library instead or your executable provides any INTERFACE/ PUBLIC headers (e.g. Then setting the include paths should be as easy as: target_include_directories(Engine PRIVATE "$") I assume you are building an executable (because of main.cpp) and that your CMakeLists.txt resides in the Engine/ directory.
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