如何修复 C 警告：implicit declaration of function 'dlsym'

问题：

你有类似这样的 C 代码

main.c

dlsym(RTLD_NEXT, 'myfunc');

dlsym(RTLD_NEXT, 'myfunc');

但当你尝试编译它时，你看到类似这样的警告消息

dlsym_warning.txt

main.c: In function ‘main’:
main.c:3:5: warning: implicit declaration of function ‘dlsym’ [-Wimplicit-function-declaration]
     dlsym(RTLD_NEXT, 'myfunc');

main.c: In function ‘main’:
main.c:3:5: warning: implicit declaration of function ‘dlsym’ [-Wimplicit-function-declaration]
     dlsym(RTLD_NEXT, 'myfunc');

解决方案

添加

main_fixed.c

#include <dlfcn.h>

#include <dlfcn.h>

在错误发生的源文件顶部。这将包含 dlopen、dlsym 以及相关定义如 RTLD_NEXT。

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