如何避免“非空值”编译器警告的“空参数”?

Compiling the following code:

编译下面的代码:

#include <string.h>
#define FOO (NULL)

int main(int argc, char *argv[])
{
    char *foo;

    if (FOO)
        foo = strdup(FOO);

    return 0;
}
#inc