cmake_minimum_required(VERSION 3.4)

project(Foo)

include(GenerateExportHeader)

file(WRITE foo.hpp [[
    #include "foo_export.h"

    class FOO_EXPORT Foo
    {
    public:
        Foo() {}

        static void my_static();
    };
]])

file(WRITE foo.cpp [[
    #include "foo.hpp"

    void Foo::my_static()
    {

    }
]])

add_library(foo SHARED foo.cpp foo.hpp)
target_include_directories(foo PUBLIC ${CMAKE_CURRENT_BINARY_DIR})

generate_export_header(foo)

file(WRITE bar.cpp [[
    #include "foo.hpp"

    int main()
    {
        Foo::my_static();

        Foo foo;
    }
]])

add_executable(bar bar.cpp)
target_link_libraries(bar PRIVATE foo)