如何修复 Linux 项目中的共享库 (.so) 之一？
我想快速修复项目的 .so 库之一。重新编译 .so 并替换原来的是否安全？或者我必须重建并重新安装整个项目？或者这取决于？
I want to make a quick fix to one of the project's .so libraries. Is it safe to just recompile the .so and replace the original? Or I have to rebuild and reinstall the whole project? Or it depends?
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这取决于。共享库需要与您的可执行文件二进制兼容。
例如，
经验法则（对于生产版本）是，如果您没有意识到自己正在维护二进制兼容性，或者不确定什么是二进制兼容性，则应该重新编译。
It depends. Shared library needs to be binary-compatible with your executable.
For example,
The rule of thumb (for production releases) is that, if you are not consciously aware that you are maintaining binary compatibility, or not sure what binary compatibility is, you should recompile.
这当然是使用动态库的目的：如果库中的某些内容需要更新，那么您只需更新该库，而使用它的程序不需要更改。如果您要更改的函数的签名没有改变，并且它完成了相同的事情，那么这通常没问题。
当然，总会有一些边缘情况，其中程序依赖于函数的某些未记录的副作用，然后更改该函数的实现可能会更改副作用并破坏程序；但这就是生活。
That's certainly the intent of using dynamic libraries: if something in the library needs updating, then you just update the library, and programs that use it don't need to be changed. If the signature of the function you're changing doesn't change, and it accomplishes the same thing, then this will in general be fine.
There are of course always edge cases where a program depends on some undocumented side-effect of a function, and then changing that function's implementation might change the side-effect and break the program; but c'est la vie.
如果您没有更改共享库的ABI，则只需重建并替换该库即可。
If you have not changed the ABI of the shared library, you can just rebuild and replace the library.
这取决于是。
但是，我假设您拥有构建其他内容的完全相同的源代码和编译器，现在如果您仅在
.cpp文件中更改某些内容，那就没问题了。其他事情，例如更改头文件中的接口（共享库和系统其余部分之间）是不好的。
It depends yes.
However, I assume you have the exact same source and compiler that built the other stuff and now if you only change in a
.cppfile something, it is fine.Other things e.g. changing an interface (between the shared lib and the rest of the system) in a header file is not fine.
如果您不更改库二进制接口，则仅重新编译和重新部署共享库就可以了。
很好的参考：
If you don't change your library binary interface, it's ok to recompile and redeploy only the shared library.
Good references: