问题描述
|
我在Linux中有一个可执行文件-
exe
该可执行文件具有一些功能,这些功能在整个代码中都使用:
sendMsg
debugPrint
然后,我想动态加载一个为我的可执行文件提供额外功能的ѭ3。
在此共享库中,我包含sendMsg
和debugPrint
的标头。
我用dlopen()
加载了这个共享库,并用ѭ7create创建了一个API。
但是,在ѭ6时,我使用RTLD_NOW
在加载时解析所有符号。
它未能说明找不到sendMsg
符号。
该符号必须在可执行文件中,因为在其中编译了“ 11”。
但是,我的可执行文件已被“ 12”进程删除。因此,dlopen
找不到符号将是有意义的。
我该如何解决这种情况?
我可以将共享功能构建到静态库中,并将该静态库链接到exe
和.so
中。这会增加代码大小:(
我可以去掉ѭ0的剥离,以便可以找到符号
进行一些我不知道的魔术链接时的编译时间,以便.so
知道符号在ѭ0中的位置
解决方法
man ld
:
-E
--export-dynamic
--no-export-dynamic
When creating a dynamically linked executable,using the -E option or the --export-dynamic option causes the linker to add all symbols to the dynamic symbol table. The
dynamic symbol table is the set of symbols which are visible from dynamic objects at run time.
If you do not use either of these options (or use the --no-export-dynamic option to restore the default behavior),the dynamic symbol table will normally contain only those
symbols which are referenced by some dynamic object mentioned in the link.
If you use \"dlopen\" to load a dynamic object which needs to refer back to the symbols defined by the program,rather than some other dynamic object,then you will probably
need to use this option when linking the program itself.
You can also use the dynamic list to control what symbols should be added to the dynamic symbol table if the output format supports it. See the description of
--dynamic-list.
Note that this option is specific to ELF targeted ports. PE targets support a similar function to export all symbols from a DLL or EXE; see the description of
--export-all-symbols below.
您还可以将-rdynamic
选项传递给gcc / g ++(如注释中所述)。根据您设置make脚本的方式,这将很方便