如何修复 C 错误 'RTLD_NEXT undeclared'

问题：

你有类似这样的 C 代码

dlsym_example.c

dlsym(RTLD_NEXT, 'myfunc');

dlsym(RTLD_NEXT, 'myfunc');

但当你尝试编译它时，你看到类似这样的错误消息

dlsym_error.txt

main.c:3:11: error: ‘RTLD_NEXT’ undeclared (first use in this function)
     dlsym(RTLD_NEXT, 'myfunc');
           ^~~~~~~~~

main.c:3:11: error: ‘RTLD_NEXT’ undeclared (first use in this function)
     dlsym(RTLD_NEXT, 'myfunc');
           ^~~~~~~~~

添加

fix_rtld_next.c

#define _GNU_SOURCE
#include <dlfcn.h>

#define _GNU_SOURCE
#include <dlfcn.h>

在错误发生的源文件顶部。

为了声明 RTLD_NEXT，#define _GNU_SOURCE 必须出现在第一个 #include 语句之前！

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