CMake宏从流的中间返回吗？ [英] CMake macro return from middle of the flow?

问题描述

我可以从CMake 宏的中间返回吗？我想到的一个用例如下。

Can I return from the middle of a CMake macro? A use case I have in mind is below.

macro (my_macro a b c)
    if (NOT USE_${a})
         # I WANT TO RETURN FROM HERE.
    endif ()
    if (NOT USE_${b})
         # I WANT TO RETURN FROM HERE.
    endif ()
    # Do something to c...
endmacro()

推荐答案

CMake中的宏基本上是替代品，因此您实际上并没有从中返回。我建议您将 b和 c代码包装到 else（）中：

Macros in CMake are basically substitutions, so you don't actually return from it. I'd suggest you wrapping "b" and "c" code into else():

macro (my_macro a b c)
    if (NOT USE_${a})
         # I WANT TO RETURN FROM HERE.
    else ()
    if (NOT USE_${b})
         # I WANT TO RETURN FROM HERE.
    endif ()
    # Do something to c...
    endif(NOT USE_${a})
endmacro()

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