在Cmake中使用变量名调用宏 [英] Invoke macro with variable name in Cmake

问题描述

我希望能够做到这一点（如果可能的话（尝试获取伪多态性/函数传递以避免复制粘贴））

I'd like to be able to do this (if possible (trying to get pseudo polymorphism/function passing to avoid copy-paste))

 macro(do_A x)
 endmacro()

 macro(do_B x)
 endmacro()

 macro(C y x)
 do_${x}(y)
 endmacro()

 C(asdf,A)

有没有做这种事情的机制？

Is there any mechanism to do such a thing?

编辑：问起来可能更准确，可以吗将宏作为参数传递给另一个宏？

it may be more accurate to ask, can you pass a macro as an argument to another macro?

推荐答案

我不确定是否有更好的方法，但是可以使用 configure_file 和 include 作为帮助程序。

I'm not sure if there's a better way, but you can use configure_file and include here as helpers.

所以，我如果您创建了一个名为 macro_helper.cmake.in的输入文件，其内容如下所示：

So, if you create an input file called "macro_helper.cmake.in" and have its contents as just the following line:

@MacroName@(MacroArg)

然后，您可以将其配置为每个宏的输出文件，然后简单地 include 输出文件：

Then you can configure this to a per-macro output file, and simply then include the output file:

macro(C MacroArg MacroId)
  set(MacroName do_${MacroId})
  # Need to make MacroArg a "proper" variable since we're in a macro, not a
  # function.  Run 'cmake --help-command macro' for more info.
  set(MacroArg ${MacroArg})
  set(OutputFile ${CMAKE_BINARY_DIR}/helpers/macro_helper_${MacroId}.cmake)
  configure_file(macro_helper.cmake.in ${OutputFile} @ONLY)
  include(${OutputFile})
endmacro()

注意：调用 C 时不希望逗号-只需这样做：

Note: you don't want the comma when invoking C - just do:

C(asdf A)

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