add_library(common_library STATIC ${__SOURCES} ${__HEADERS})

#if defined(MY_DEFINE_1)
// specific code #1
#elif defined (MY_DEFINE_2)
// specific code #2
#else
// error
#endif

target_compile_definitions(common_library -DMY_DEFINE_1)
add_executable(BINARY_1  ${bin1_sources}   )
add_dependencies(BINARY_1      common_library)

target_compile_definitions(common_library -DMY_DEFINE_2)
add_executable(BINARY_2  ${bin2_sources}   )
add_dependencies(BINARY_2      common_library)