如何定义字符串中的gcc命令行的文字？ [英] How to define a string literal in gcc command line?

问题描述

在GCC命令行中，我想定义一个字符串，如 -Dname =玛丽，然后在源$ C ​​$ C我想的printf（％S，姓名）; 打印玛丽结果
我怎么能这样做呢？

In gcc command line, I want to define a string such as -Dname=Mary, then in the source code I want printf("%s", name); to print Mary.
How could I do it?

推荐答案

两个选项。首先，逃避引号使shell不会吃他们：

Two options. First, escape the quotation marks so the shell doesn't eat them:

gcc -Dname=\"Mary\"

或者，如果你真的想-Dname =玛丽，你可以stringize它，虽然它有点哈克。

Or, if you really want -Dname=Mary, you can stringize it, though it's a bit hacky.

#include <stdio.h>

#define STRINGIZE(x) #x
#define STRINGIZE_VALUE_OF(x) STRINGIZE(x)


int main(int argc, char *argv[])
{
    printf("%s", STRINGIZE_VALUE_OF(name));
}

注意STRINGIZE_VALUE_OF将愉快地评价到宏的最终定义。

Note that STRINGIZE_VALUE_OF will happily evaluate down to the final definition of a macro.

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