linux - 将共享对象中的符号解析为可执行文件

Question

我如何创建一个可执行文件来动态加载共享对象并将其 undefined symbol 解析为可执行文件本身？在 Linux 上。

比如共享对象有

extern int a;
void f() { a=1; }

可执行文件有

int a;

我想从可执行文件中调用 f() 并更改 a 的值。

谢谢。

Answer 1

来自 dlopen 手册页:

External references in the library are resolved using the libraries in that library's dependency list and any other libraries previously opened with the RTLD_GLOBAL flag. If the executable was linked with the flag "-rdynamic" (or, synonymously, "--export-dynamic"), then the global symbols in the executable will also be used to resolve references in a dynamically loaded library.

因此，使用 -rdynamic 重新编译您的主应用程序应该会有所帮助。