如何从cmake中的函数提前返回？

Question

如何从CMake中的函数早期返回,如下例所示？

function do_the_thing(HAS_PROPERTY_A)
    # don't do things that have property A when property A is disabled globally
    if (PROPERTY_A_DISABLED AND HAS_PROPERTY_A)
        # What do you put here to return?
    endif()

    # do things and implement magic
endfunction()

Answer 1

您可以使用return()(此处为 CMake手册页),如果在函数中调用,则从函数返回.

例如:

cmake_minimum_required(VERSION 3.0)
project(returntest)

# note: your function syntax was wrong - the function name goes
# after the parenthesis
function (do_the_thing HAS_PROPERTY_A)

    if (HAS_PROPERTY_A)
        message(STATUS "Early Return")
        return()
    endif()

    message(STATUS "Later Return")
endfunction()


do_the_thing(TRUE)
do_the_thing(FALSE)

结果是:

$ cmake ../returntest
-- Early Return
-- Later Return
-- Configuring done
...

它也可以在函数外部工作:如果你从include()ed文件中调用它,它会返回到includer,如果你从文件中调用add_subdirectory()它,它会返回到父文件.