cmake-macro-vs-function

cmake中，macro类似于C中的宏函数，会进行参数替换，而function类似于C中的函数，
参数是一个变量，可以进行赋值等操作。

示例：

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set(var "ABC")

macro(Moo arg)
  message("arg = ${arg}")
  set(arg "abc")
  message("# After change the value of arg.")
  message("arg = ${arg}")
endmacro()
message("=== Call macro ===")
Moo(${var})

function(Foo arg)
  message("arg = ${arg}")
  set(arg "abc")
  message("# After change the value of arg.")
  message("arg = ${arg}")
endfunction()
message("=== Call function ===")
Foo(${var})

输出：

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=== Call macro ===
arg = ABC
# After change the value of arg.
arg = ABC
=== Call function ===
arg = ABC
# After change the value of arg.
arg = abc

参考

  1. http://stackoverflow.com/questions/24297999/function-vs-macro-in-cmake
  2. http://www.cmake.org/cmake/help/v3.0/command/macro.html
  3. http://www.cmake.org/cmake/help/v3.0/command/function.html

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