在CMake中枚举控制台参数(argv)

Question

我想在CMake中解析/处理传递的控制台参数,所以如果我在控制台中运行它:

cmake -DCMAKE_BUILD_TYPE=Release -DSOME_FLAG=1 ..

我想获得-DCMAKE_BUILD_TYPE=Release和-DSOME_FLAG=1来自这里面的CMake的脚本(通过了所有其他参数)并保存它们的地方.

我想要它的原因是通过自定义CMake脚本(后面调用execute_process(cmake <something>))传递所有参数,例如

cmake -DCMAKE_BUILD_TYPE=Release -P myscript.cmake

Answer 1

还有CMAKE_ARGC其中包含传递给CMake的(由空格分开)变量数量变量,CMAKE_ARGV0,CMAKE_ARGV1,...其中包含实际值.

对于C++语言来说,第一个(零)变量保存你调用的命令(cmake在这种情况下)是很常见的,所以我们需要除了之外的所有内容CMAKE_ARGV0.让我们做一个简单的循环:

set(PASSED_PARAMETERS "") # it will contain all params string
set(ARG_NUM 1) # current index, starting with 1 (0 ignored)

# you can subtract something from that if you want to ignore some last variables
# using "${CMAKE_ARGC}-1" for example 
math(EXPR ARGC_COUNT "${CMAKE_ARGC}") 

while(ARG_NUM LESS ARGC_COUNT)
    # making current arg named "CMAKE_ARGV" + "CURRENT_INDEX"
    # in CMake like in Bash it's easy
    set(CURRENT_ARG ${CMAKE_ARGV${ARG_NUM}}) 

    message(STATUS "Doing whatever with ${CURRENT_ARG}")  

    # adding current param to the list
    set(PASSED_PARAMETERS ${PASSED_PARAMETERS} ${CURRENT_ARG})        

    math(EXPR ARG_NUM "${ARG_NUM}+1") # incrementing current index
endwhile()

(回答我自己的问题,在SO中找不到类似的东西,也许它会帮助某人)