Why does Linux need to explicitly link dynamic libraries?

linux explicitly links dynamic libraries, the benefits are: 1. By using dynamic link libraries, different applications can share the same library, saving memory space; 2. Encapsulate commonly used functions in dynamic link libraries , which can make the source code of the application more concise and simplify program compilation and maintenance; 3. The code of the dynamic link library is loaded and mapped into the memory during program execution, which can improve operating efficiency; 4. The dynamic link library supports version management , the library version can be updated without affecting already compiled programs.

The operating system of this tutorial: Linux5.18.14 system, Dell G3 computer.

In Linux, using dynamic link libraries has the following benefits, which is why in many cases it is recommended to link dynamic libraries into applications:

1. Save memory space: A dynamic link library (also called a shared library) is a collection of executable codes and functions that can be shared and used by multiple applications. By using dynamic link libraries, different applications can share the same library, thus avoiding repeated loading and occupying additional memory space.

2. Simplify program compilation and maintenance: Encapsulating commonly used functions in dynamic link libraries can make the source code of the application more concise, and only need to reference the library functions in the program. If the library code needs to be updated or a vulnerability needs to be fixed, only the dynamic link library itself needs to be updated, without the need to recompile the entire program.

3. Improve operating efficiency: The code of the dynamic link library is loaded and mapped into memory during program execution, which saves disk space and reduces program loading and startup time. Compared with static link libraries, dynamic link libraries are not completely loaded into memory when the program starts, but are loaded on demand, which improves the running efficiency of the program.

4. Flexible version management: The dynamic link library supports version management, and the version of the library can be updated without affecting the compiled program. If an application depends on a specific version of a dynamic link library, you can ensure that that version is available and switch if needed.

Although explicitly linking dynamic libraries has some disadvantages in some cases, such as dependence on the library, the need to ensure the availability of the library during deployment, etc., in most cases, using Dynamic link libraries will provide better flexibility, higher resource utilization, and simpler code.

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