cmake examples

cmake externalproject_add_step(EXCLUDE_FROM_MAIN) examples

antlr/antlr4 runtime/Cpp/cmake/ExternalAntlr4Cpp.cmake :132

ExternalProject_Add_Step(
    antlr4_runtime
    build_static
    COMMAND ${ANTLR4_BUILD_COMMAND} antlr4_static
    # Depend on target instead of step (a custom command)
    # to avoid running dependent steps concurrently
    DEPENDS antlr4_runtime
    BYPRODUCTS ${ANTLR4_STATIC_LIBRARIES}
    EXCLUDE_FROM_MAIN 1
    WORKING_DIRECTORY ${ANTLR4_BUILD_DIR})

antlr/antlr4 runtime/Cpp/cmake/ExternalAntlr4Cpp.cmake :153

ExternalProject_Add_Step(
    antlr4_runtime
    build_shared
    COMMAND ${ANTLR4_BUILD_COMMAND} antlr4_shared
    # Depend on target instead of step (a custom command)
    # to avoid running dependent steps concurrently
    DEPENDS antlr4_runtime
    BYPRODUCTS ${ANTLR4_SHARED_LIBRARIES} ${ANTLR4_RUNTIME_LIBRARIES}
    EXCLUDE_FROM_MAIN 1
    WORKING_DIRECTORY ${ANTLR4_BUILD_DIR})