如何编写具有多个参数组的cmake函数？

Question

例如,我想my_add_lib用以下语法编写一个函数:

my_add_lib(NAME <name>
           SRCS [src1 [src2 ...]]
           DEPS [dependency1 [dependancy2 ...]]])

如何实现这些"参数组"？

Answer 1

CMake提供了CMakeParseArguments模块,可以为您进行参数解析.例:

include(CMakeParseArguments)

function(my_add_lib)
    cmake_parse_arguments(
        PARSED_ARGS # prefix of output variables
        "" # list of names of the boolean arguments (only defined ones will be true)
        "NAME" # list of names of mono-valued arguments
        "SRCS;DEPS" # list of names of multi-valued arguments (output variables are lists)
        ${ARGN} # arguments of the function to parse, here we take the all original ones
    )
    # note: if it remains unparsed arguments, here, they can be found in variable PARSED_ARGS_UNPARSED_ARGUMENTS
    if(NOT PARSED_ARGS_NAME)
        message(FATAL_ERROR "You must provide a name")
    endif(NOT PARSED_ARGS_NAME)
    message("Provided sources are:")
    foreach(src ${PARSED_ARGS_SRCS})
        message("- ${src}")
    endforeach(src)
endfunction(my_add_lib)

从CMake 3.5开始,cmake_parse_arguments变成内置命令(用C++而不是CMake编写):include(CMakeParseArguments)不再需要,但是,目前,文件CMakeParseArguments.cmake保持为空以保持兼容性.