Sometimes there is the need to introduce options that are dependent on the value of other options. In our example, we might wish to offer the option to either produce a static or a shared library. However, this option would have no meaning if the USE_LIBRARY logical was not set to ON. CMake offers the cmake_dependent_option() command to define options that depend on other options:
include(CMakeDependentOption)# second option depends on the value of the firstcmake_dependent_option( MAKE_STATIC_LIBRARY "Compile sources into a static library" OFF "USE_LIBRARY" ON )# third option depends on the value of the firstcmake_dependent_option( MAKE_SHARED_LIBRARY "Compile sources into a shared library" ON "USE_LIBRARY" ON )
If USE_LIBRARY ...
