[CMake] Troubles with include_directories

[Eric Noulard]

Le sam. 9 mars 2019 à 08:44, Workbench at gmx.at <workbench at gmx.at> a écrit :

> Hi everyone,
>
> i've a project setup that looks like this:
>
>
> abc.h
>
> def.h
>
> and all my other .cpp and .h files are in the folder intern. Now my
> CMakeLists.txt looks like this:
>
> cmake_minimum_required(VERSION 3.7)
> project(BS_Application)
> set(SRC
>      BS_AppTypes.hpp
>      BS_IEvent.hpp
>      BS_ISystem.hpp
>      BS_IWindow.hpp
>      BS_ITimerTask.hpp
>      BS_IEventConsumer.hpp
>      BS_Application.cpp
>      BS_Button.cpp
>      BS_ContextSDL.cpp
>      BS_ISystem.cpp
>      BS_System.cpp
>      BS_SystemSDL.cpp
>      BS_WindowSDL.cpp
>      BS_ContextSDL.cpp
>      BS_DisplayManagerSDL.cpp
>      BS_Button.cpp
>      BS_EventManager.cpp
>      BS_EventPrinter.cpp
>      BS_ModifierKeys.cpp
>      BS_DisplayManager.cpp
> )
> set(INC
>      intern
> )
> include_directories(${INC})
> add_library(BS_Application STATIC ${SRC})
>
> Where all files above BS_Application.cpp are in the folder intern but he
> is not able to find BS_Application.cpp but i added it to the
> include_direcotires, what am i doing wrong here ?
>

First of all usage of include_directories is a discouraged old-style
variable oriented CMake.
You should prefer target oriented rule.
Namelly target_include_directories().
You can have a look at:
https://steveire.wordpress.com/2017/11/05/embracing-modern-cmake/ and/or
refered presentation from Daniel Pfeifer or Mathieu Ropert there in.
It'll get you a broad view of the "Modern CMake way to go".

Now both commands (target_include_directories or include_directories)
influence where *header* file are found.
So that if you say

include_directories(${INC})
add_library(BS_Application STATIC BS_Application.cpp)

CMake won't go looking for "BS_Application.cpp" inside ${INC}.
You should refer to your source files with the proper path:
i.e.
add_library(BS_Application STATIC ${INC}/BS_Application.cpp)

You may consider having a look at how to use target_source as well.
Craig Scott published a nice blog entry about that:
https://crascit.com/2016/01/31/enhanced-source-file-handling-with-target_sources/

Regards,
Eric


> best regards!
>
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-- 
Eric
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