c - 在两个源文件之间拆分类似函数的宏调用

Question

C 标准中是否有任何内容阻止我执行以下操作？

// main.c
#define DECORATE(x) ***x***
#include "call_macro.h"
this is the text I want decorated)

// call_macro.h
DECORATE(

当通过 gcc -E main.c 运行它时，我希望得到

*** this is the text I want decorated***

相反，它提示 macro_call.h:2: error: unterminated argument list invoking macro "DECORATE"，但实际上我在标准中找不到任何对它的禁止。

想法？

Answer 1

5.1.1.2 Translation phases
(1.4) Preprocessing directives are executed, macro invocations are expanded, and _Pragma unary operator expressions are executed... A #include preprocessing directive causes the named header or source file to be processed from phase 1through phase 4, recursively. All preprocessing directives are then deleted.

我相信这表明每个包含的 header 在“合并”到整个翻译单元之前都经过单独预处理。正是在这一点上，不完整的类似函数的宏调用将是格式错误的:

6.10.3/4 ... There shall exist a ) preprocessing token that terminates the invocation.