Cannot build cmake project with including directories in cmake project

Question

|---Engine |----CMakeList.txt |----Engine.cpp |----Engine.h |---Models |----CMakeList.txt |----Snake.cpp |----Snake.hpp |---Type |----CMakeList.txt |----Point.hpp |---CMakeList.txt |---main.cpp

I just can't tell the main sheet that I want to add a directory with files to it ...

Each time, errors of the following type appear:

CMake Error at CMakeLists.txt: 12 (target_include_directories): Cannot specify include directories for target "Snake" which is not built by this project. CMake Error at CMakeLists.txt: 13 (target_link_directories): Cannot specify link directories for target "Snake" which is not built by this project. CMake Error at Engine / CMakeLists.txt: 8 (target_include_directories): Cannot specify include directories for target "Snake" which is not built by this project. CMake Error at CMakeLists.txt: 17 (target_link_libraries): Cannot specify link libraries for target "Snake" which is not built by this project. - Configuring incomplete, errors occurred!

Which, for several hours of intensified attempts, are not corrected in any way. Can anyone help with this?

CMakeLists.txt from Engine folder:

set(HEADERS Engine.h) set(SOURCES Engine.cpp) add_library(Engine ${HEADERS} ${SOURCES}) target_include_directories(${PROJECT_NAME} PUBLIC ${CMAKE_CURRENT_LIST_DIR})

Main CMakeList.txt:

cmake_minimum_required(VERSION 3.16.3) project(Snake) set(CMAKE_CXX_STANDARD 17) set(CMAKE_CXX_STANDARD_REQUIRED ON) set(CMAKE_CXX_EXTENSIONS OFF) set(PROJECT_SOURCES main.cpp ) target_include_directories(${PROJECT_NAME} PUBLIC Engine) target_link_directories(${PROJECT_NAME} PUBLIC Engine) add_subdirectory(Engine) target_link_libraries(${PROJECT_NAME} Engine) add_executable(${PROJECT_NAME} ${PROJECT_SOURCES} ) find_package(SFML 2.5.1 COMPONENTS graphics audio REQUIRED) include_directories(${SFML_INCLUDE_DIR}) target_link_libraries(${PROJECT_NAME} sfml-graphics sfml-audio) set(SFML_STATIC_LIBRARIES FALSE)

You're trying to use a target (${PROJECT_NAME}) before it's been declared. — Stephen Newell
– Stephen Newell, Commented Sep 16, 2021 at 16:56
Variable PROJECT_NAME refers to the name of the current project, started with project() command. It seems that you forgot to call project() in the Engine/CMakeLists.txt. — Tsyvarev
– Tsyvarev, Commented Sep 16, 2021 at 17:13

ignacio · Accepted Answer · 2021-09-16 17:21:16Z

There are two errors. The first one is to call a PROJECT_NAME that hasn't been built yet. add_executable(${PROJECT_NAME} ...) and add_library(${PROJECT_NAME ...) should be used before the target_include_directories and target_link_directories that refers to it. Because, as @Stephen Newell noted, otherwise you will be using a PROJECT NAME that hasn't been declared/built yet.

The second error is that you are calling a PROJECT_NAME inside Engine/CMakeLists. Maybe you are missing a project(...) inside of it.

Maybe you should move set(SFML_STATIC_LIBRARIES FALSE) before linking it, as well.

I changed my main CMakeLIst and right now its work good but i have another problem and it Type/CMakeLIst.txt ``` project(Snake) set(HEADER Point.hpp) add_library(Type ${HEADER}) target_include_directories(${PROJECT_NAME} PUBLIC ${CMAKE_CURRENT_LIST_DIR}) ``` Its cannot linking with main cmakelist and i havent an idea for solve this problem. New main cmakelist : pastebin.com/tPts9kVu
You would need to also show the Type/CMakeLists.txt, which by the way you wrote with a typo ... make sure that your file doesn't have one as well

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