How to make QtCreator CMake build depend on another CMake project?-CodePudding

I have a CMake project that produces a static library. It compiles fine in QtCreator and produces the library in build dir. The CMakeLists.txt for the static library looks like this:

cmake_minimum_required(VERSION 3.5)

project(mystaticlib VERSION 0.1 LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

file(GLOB mystaticlib_SRC "src/**.cpp")
add_library( mystaticlib STATIC
    ${mystaticlib_SRC}
)
target_include_directories( mystaticlib PRIVATE include/mystaticlib INTERFACE include )

Now I have a Qt application project and I'd like to make it so that it depends on the other one - meaning I can do something like in the QtProject:

cmake_minimum_required(VERSION 3.25)

project(MyQtProject VERSION 0.1 LANGUAGES CXX)

# This is how I imagine it working, not an actual code
include_project(mystaticlib, "~/my_projects/mystaticlib/CMakeLists.txt")
set(HEADERS_mystaticlib get_project_headers(mystaticlib))
# end of made up code
add_executable(MyQtProjectEXE ${PROJECT_SOURCES})
target_link_libraries(MyQtProjectEXE mystaticlib)
target_include_directories(MyQtProjectEXE HEADERS_mystaticlib)

How can I get something like that? In practice, I'd like it to work so that the dependent project directory can be set to whatever during cmake configure step.

CodePudding user response：

You are most likely interested in add_subdirectory.

If the containing subdirectory has a CMakeLists.txt then by:

add_subdirectory("./path/to/the/directory")

You will include all targets defined in that CMakeLists.txt file.

All you have to do is add a dependency by using target_link_libraries. CMake will then understand that the subdirectory needs to be build beforehand.

EDIT: To use your project as an example:

cmake_minimum_required(VERSION 3.25)

project(MyQtProject VERSION 0.1 LANGUAGES CXX)

# This is how I imagine it working, not an actual code


#if the path is a subdirectory within the current folder
add_subdirectory("./local_path/to/mystaticlib")
#if not you need to specify a binary dir
add_subdirectory("/absolute/path/to/mystaticlib" "${CMAKE_CURRENT_BINARY_DIR}/mystaticlib")


set(HEADERS_mystaticlib get_project_headers(mystaticlib))
# end of made up code
add_executable(MyQtProjectEXE ${PROJECT_SOURCES})
target_link_libraries(MyQtProjectEXE mystaticlib)
target_include_directories(MyQtProjectEXE HEADERS_mystaticlib)