CODEWITHSUNDEEP
c++cmake
MakotoE
MakotoE

Reputation: 2099

Include includes in subproject

I have projectB as a subproject of projectA. Both projects contain an include directory for storing header libraries. The folder structure looks like this:

projectA/CMakeLists.txt
projectA/A.cpp
projectA/include/projectB/CMakeLists.txt
projectA/include/projectB/B.h
projectA/include/projectB/include/boost
projectA/include/projectB/include/...

Inside B.h, I am using Boost, so the include line looks like this:

#include <boost/algorithm/string.hpp>

In A.cpp, I am including B.h.

#include <B.h>

In projectA/CMakeLists.txt, I am including projectB and all of its includes like this:

include_directories(
    include/projectB
    include/projectB/include/boost 
    include/projectB/include/...)

If I didn't include all library directories that projectB uses, I cannot compile, as the compiler cannot find boost. (I get an error which says: boost/algorithm/string.hpp: No such file or directory)

Is there a simpler process to have projectA import all includes from projectB and change the paths to reflect this project hierarchy?

Upvotes: 0

Views: 931

Answers (1)

Torbj&#246;rn
Torbj&#246;rn

Reputation: 5800

With modern CMake (i.e. 3.x) it is not recommended any more to use include_directories. The alternative is to define the include directories per target with appropriate "visibility".

Assuming, projectA is a static or shared library defined in projectA/CMakeLists.txt as follows, with projectA_SOURCES being a list of all source files (i.e. not header files) for that library.

add_library(projectA ${projectA_SOURCES})
target_include_directories(projectA
    PUBLIC ${CMAKE_CURRENT_LIST_DIR}/include/projectB/include
           ${CMAKE_CURRENT_LIST_DIR}/include/projectB/include/boost
    PRIVATE ${CMAKE_CURRENT_LIST_DIR}/include/projectB)

Then, in projectB/CMakeLists.txt after having target projectB being defined (either as a library or executable, that does not matter):

target_include_directories(projectB
    PUBLIC ${CMAKE_CURRENT_LIST_DIR}/include/projectA/include
    PRIVATE ${CMAKE_CURRENT_LIST_DIR}/include/projectA)
target_link_library(projectB
    PUBLIC projectA)

Upvotes: 2

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