[SOLVED] How to compile all the libraries as static but one as shared?

Issue

My folder structure is like that:

├── SubLibA
│   ├── CMakeLists.txt
│   ├── include
│   │   └── SubLibA.h
│   └── SubLibA.cpp
├── SubLibB
│   ├── CMakeLists.txt
│   ├── include
│   │   └── structs.h
│   └── SubLibB.cpp
└── SharedLib
    ├── CMakeLists.txt
    ├── include
    │   └── SharedLib.h
    ├── SharedLib.cpp
    └── SharedLib.h

My global CMakeLists.txt looks like this:

add_subdirectory(SubLibA)
add_subdirectory(SubLibB)
add_subdirectory(SharedLib)

They all compile as static by default.

• SharedLib depends on SubLibB that depends on SubLibA.
• The dependent libraries SharedLib and SubLibB have:

#SubLibB
target_link_libraries(${PROJECT_NAME}
    SubLibA::SubLibA
)

#SharedLib
target_link_libraries(${PROJECT_NAME}
    SubLibB::SubLibB
)

Running cmake .. -DBUILD_SHARED_LIBS=ON compiles all the three libs as shared library...

Since they are tightly dependent, I'd like to keep them in the same repository with a unique CMakeLists.txt that compiles them all at once. I want to use the power of Modern CMake with the least hard-coded file and custom files as possible to keep a straightforward maintenance.

Solution

Try setting the variable within cmake:

set(BUILD_SHARED_LIBS OFF)
add_subdirectory(SubLibA)
add_subdirectory(SubLibB)
set(BUILD_SHARED_LIBS ON)
add_subdirectory(SharedLib)
set(BUILD_SHARED_LIBS OFF)

Answered By - KamilCuk