Including specific paths when using CMake-CodePudding

I have the following code structure:

--src
   |--common--include--common---datatype--a_h_file.hpp
   |         |
   |          --src
   |
   |--main_lib
   |    |--------include-----one---one.hpp
   |          |
   |          |---src--------one----one.cpp
   |          CMakeLists.txt
   |---main.cpp
       CMakeLists.txt

main.cpp uses one.hpp without problem.

My CMakeLists.txt files are like this

Upper level

cmake_minimum_required(VERSION 3.0.0)

project(MyProject VERSION 1.0.0)


add_subdirectory(main_lib)

add_executable(myproj main.cpp)

target_link_libraries(myproj PUBLIC mainpub)

and the other

add_library(mainpub
src/one/one.cpp)

target_include_directories(mainpub PUBLIC include)

With this I can use one.hpp

My problem is that by design it has been decided that one.hpp should include a_h_file.hpp like this

(one.hpp)

#pragma once

float addition(float,float);

#include "common/data_type/a_h_file.hpp"  //<---THIS!

class whatever{
    public:

    int number=1;
};

So, my question is how do I modify the CMake files to include the path /src/common/include to the paths that are going to be considered in order to be able to use a_h_file.hpp?

EDIT: I tried

cmake_minimum_required(VERSION 3.0.0)

project(MyProject VERSION 1.0.0)
add_library(Common INTERFACE)
target_include_directories(Common INTERFACE common/include)

add_subdirectory(main_lib)

add_executable(myproj main.cpp)

target_link_libraries(myproj PUBLIC mainpub)

and in the other

add_library(mainpub
src/one/one.cpp)

#target_include_directories(mainpub PUBLIC include ../common/include) 

#target_include_directories(mainpub PUBLIC Common)

#target_include_directories(mainpub PUBLIC include)

target_include_directories(mainpub PUBLIC Common include)

but it did not work :(

fatal error: common/data_type/a_h_file.hpp: No such file or directory
     #include "common/data_type/a_h_file.hpp"
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~

EDIT2:

Modified the second Cmake file to

add_library(mainpub
src/one/one.cpp)

target_link_libraries(mainpub PUBLIC Common)

target_include_directories(mainpub PUBLIC include)

It did not work either.

CodePudding user response：

First, define an INTERFACE target for your common directory in the top-level CMakeLists.txt:

add_library(Common INTERFACE)
target_include_directories(Common INTERFACE common/include)

Then just link against it in your targets, which will propagate the include directories:

target_link_libraries(mainpub PUBLIC Common)