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I want to use my headers and libs as common libraries for app1 and app2. My project tree are below. image/ and math/ are library directories used by app1 and app2. In this case, should I set same settings to both CmakeLists.txt under app1 and app2? Of course I know it works, but are there any smarter ways to set common libraries?

|-- CMakeLists.txt |-- app1 | |-- CMakeLists.txt | `-- main.cc |-- app2 | |-- CMakeLists.txt | `-- main.cc |-- image | |-- CMakeLists.txt | |-- include | | `-- image_func.h | `-- src | `-- image_func.cc `-- math |-- CMakeLists.txt |-- include | `-- math_util.h `-- src `-- math_util.cc

Roots CMakelists.txt is below. Is it possible to set math and image parameters for app1 and app2? My actual project has many applications which uses multiple libraries.

 cmake_minimum_required(VERSION 2.8) add_subdirectory("./image") add_subdirectory("./math") add_subdirectory("./app1") add_subdirectory("./app2")
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With newer versions oft CMake (since 2.8.12) you can use target_link_libraries and related functions to manage dependencies. By specifying PUBLIC the includes and libraries are also applied to all targets using the library. This will reduce duplication to a minimum.

For math and image you need to specify that the respective include directory is used and any libraries you might require.

math/CMakeLists.txt

add_library(math ...) target_include_directories(math PUBLIC include ...) target_link_libraries(math PUBLIC ...)

image/CMakeLists.txt

add_library(image ...) target_include_directories(image PUBLIC include ...) target_link_libraries(image PUBLIC ...)

app1/CMakeLists.txt

add_executabke(app1 ...) target_link_libraries(app1 PUBLIC image math)

app2/CMakeLists.txt

add_executabke(app2 ...) target_link_libraries(app2 PUBLIC image math)
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