在cmake中传递空字符串?

我试图重新定义cmake中的函数。但是,这个函数只有一些签名。如果我不认识签名,我只想用所有原始参数调用原始签名。这很好,除非函数os使用空字符串调用( "" )作为论据。这个问题可以这样说明:

function(y)
  list(LENGTH ARGN len)
  message("y got ${len} elements: ${ARGN}")
endfunction()

function(x)
  list(LENGTH ARGN len)
  message("x got ${len} elements: ${ARGN}")
  y(${ARGN})
endfunction()

x(a b "")
x(a "" c)

将以上内容保存到 x.cmake 然后跑 cmake -P x.cmake ,其中打印

> cmake -P x.cmake
x got 3 elements: a;b;
y got 2 elements: a;b
x got 3 elements: a;;c
y got 2 elements: a;c

即。, y 没有得到空字符串,我重新定义的函数将停止工作。有什么线索可以通过 全部的 参数,包括空字符串?

真正的用例正在试图重新定义 file 以更改安装。“你是另类”似乎并不适用于此:

function(file)
  message("Calling file(${ARGN})")
  _file("${ARGN}")
endfunction()

include("cmake_install.cmake")

这将导致

> cmake -P cmake_ln_install.cmake
-- Install configuration: "RelWithDebInfo"
Calling file(RPATH_CHECK;FILE;/home/janw/cmake/linux/lib/swipl/bin/x86_64-linux/swipl;RPATH;/home/janw/cmake/linux/lib/swipl/lib/x86_64-linux)
CMake Error at cmake_ln_install.cmake:3 (_file):
  _file must be called with at least two arguments.
Call Stack (most recent call first):
  src/cmake_install.cmake:43 (file)
  cmake_install.cmake:42 (include)
  cmake_ln_install.cmake:6 (include)