gcc使用笔记

 

1.如何在gcc中传输宏定义？

参考如下红色部分，可以传入宏定义

gcc [-c|-S|-E] [-std=standard]
[-g] [-pg] [-Olevel]
[-Wwarn...] [-pedantic]
[-Idir...] [-Ldir...]
[-Dmacro[=defn]...] [-Umacro]
[-foption...] [-mmachine-option...]
[-o outfile] [@file] infile...

示例：

#include <stdio.h>



int main(void)

{

#ifdef TEST

    printf("gcc has predefine!\n");

#else

    printf("gcc no predefine\n");

#endif

    return 0;

}

[root@localhost c]# gcc gcc_D_test.c -DTEST

[root@localhost c]# ./a.out 

gcc has predefine!

[root@localhost c]# gcc gcc_D_test.c

[root@localhost c]# ./a.out 

gcc no predefine