如何在CMake的execute_process中传递列表变量？

Question

我想在execute_process的子目录中执行CMake命令，并将一些缓存变量作为-D选项传递。

如果变量的类型为string，则可以正常工作。但是，如果变量是列表，则在命令行中传递列表的typical method似乎不起作用。

我尝试了该答案中列出的所有组合。我甚至试图加入mylist与"\\;"或"\\\\;"。然而，execute_process似乎总是将'-DVal2=a\\;b\\;c\\;'或'-DVal2=a;b;c'解压缩到-Dval2=a b c。

我怎么能阻止这个？只有-DVal2=a\\;b\\;c工作，但它非常烦人。

set(
    mylist
    a
    b
    c
)

set(
    cmake_args
    "-DVal1=abc"
    "'-DVal2=${mylist}'" #does not work, the execute_process will unpack it into seperated args
)

execute_process(
        COMMAND ${CMAKE_COMMAND} ${cmake_args} ${CMAKE_SOURCE_DIR}/subproject
        OUTPUT_FILE ${CMAKE_BINARY_DIR}/config.log
        ERROR_FILE ${CMAKE_BINARY_DIR}/config.log
        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/subproject
        RESULT_VARIABLE config_result
)

Answer 1

我认为你需要逃避;字符，它是CMake中列表的默认分隔符，但不清楚你是如何做到这一点的，因此它不适合你。

所以，尝试这样的事情

set(mylist_str "")

foreach(item ${mylist})
  string(APPEND mylist_str ${item} "\;")
endforeach()

# this is for debugging
message(STATUS "List as string: ${mylist_str}")

set(cmake_args 
    "-DVal1=abc"
    "-DVal2=${mylist_str}"
    "-DVal3=\"${mylist_str}\"" # this has quotes around it
)

# this is for debugging
foreach(item ${cmake_args})
  message(STATUS "A list item: ${item}")
endforeach()