CODEWITHSUNDEEP
ccmake
Phocs
Phocs

Reputation: 2510

CMake: include libraries in the project

I'm new to CMake and I need help. I'm trying to develop the following cmaketutorial project:

.
├── CMakeLists.txt
├── lib
│   ├── CMakeLists.txt
│   ├── lib1
│   │   ├── CMakeLists.txt
│   │   └── lib1.h
│   └── lib2
│       ├── CMakeLists.txt
│       ├── lib2.c
│       └── lib2.h
└── cmaketutorial
    ├── CMakeLists.txt
    └── cmaketutorial.c

lib1: general purpose library. It only contains a .h and its CMakeFiles.txt allows you to install it in /usr/local/include.

lib2: general purpose library. It contains a .c and .h and its CMakeFiles.txt allows you to install it in /usr/local/include.

lib1 and lib2: they are two libraries that exist by themselves and are taken from their respective projects.

cmaketutorial: this is the project in question, it contains a .c that includes lib1 and lib2.

CMakeLists.txt (root)

cmake_minimum_required(VERSION 3.12)
project(
    cmaketutorial
    VERSION 0.0.1
    LANGUAGES C
)

add_definitions(-D_GNU_SOURCE)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Werror -pedantic -Wno-unused-parameter")

add_subdirectory(lib)
add_subdirectory(cmaketutorial)

CMakeLists.txt (root/lib)

add_subdirectory(lib1)
add_subdirectory(lib2)

CMakeLists.txt (root/lib/lib1)

cmake_minimum_required(VERSION 3.12)
project(
    lib1
    VERSION 0.0.1
    LANGUAGES C
)

add_library(${PROJECT_NAME} INTERFACE)

target_include_directories(
    lib1
    INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}
)

# install rules
install(FILES lib1.h DESTINATION include)

CMakeLists.txt (root/lib/lib2)

cmake_minimum_required(VERSION 3.12)
project(
    lib2
    VERSION 0.0.1
    LANGUAGES C
)

if(CMAKE_CURRENT_BINARY_DIR)
    set(CMAKE_CURRENT_BINARY_DIR ${CMAKE_CURRENT_SOURCE_DIR})
endif(CMAKE_CURRENT_BINARY_DIR)

add_library(
    ${PROJECT_NAME}
    lib2.c
    ${CMAKE_CURRENT_BINARY_DIR}/lib2.h
)

target_include_directories(
    ${PROJECT_NAME}
    INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}
    PRIVATE ${CMAKE_CURRENT_BINARY_DIR}
)

install(TARGETS ${PROJECT_NAME} DESTINATION lib)
install(FILES lib2.h DESTINATION include)

CMakeLists.txt (root/cmaketutorial)

# add the executable
add_executable(cmaketutorial cmaketutorial.c)

target_include_directories(
    cmaketutorial PUBLIC
    "${PROJECT_BINARY_DIR}"
)

With current CMakeFiles * when compiling cmaketutorial.c it cannot link lib1 and lib2. How can I modify the general CMakeFiles.txt so that everything goes as it should? Can I use the original CMakeFiles.txt of lib1 and lib2?

Also, could I set up the project for which includes in cmaketutorial.c have the form #include <lib/lib1.h> and #include <lib/lib2.h>?

Upvotes: 0

Views: 200

Answers (1)

KamilCuk
KamilCuk

Reputation: 141985

How can I modify the general CMakeFiles.txt so that everything goes as it should?

You have to link cmaketutorial executable with lib1 and lib2 libraries. Add target_link_libraries (cmaketutorial PUBLIC lib1 lib2) to cmaketutorial/CMakeLists.txt.

could I set up the project for which includes in cmaketutorial.c have the form #include and #include ?

Move those files into appriopriate directories. So do:

mkdir lib/lib1/lib lib/lib2/lib
mv lib/lib1/lib1.h lib/lib1/lib
mv lib/lib2/lib2.h lib/lib2/lib/lib2.h

and then update lib/lib2/CMakeLists.txt with add_library(... lib/lib2.h) and update all the install rules when needed.

Upvotes: 2

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