Static and Dynamic library creation and use

The essence library is a binary format of executable code. It can be loaded into the memory and executed in two types: static library and dynamic library.
I. Concept
The name of the static function library is generally the link of libxxx. A function library, which is used to link all related objects during compilation and the function library involved to form an executable file. It is no longer related to the function library.
The name of the dynamic function library is generally libxxx. So.
II. Advantages and disadvantagesThe disadvantage of the static function library is that the file is large, which wastes the space library or changes to the program.
The advantage file of the dynamic function library is small, saving space. The Library is public, and there is always only one code in the memory.
III. Static and Dynamic Link Library Creation


2. Create and use static databases.


3. Create and use a dynamic library.


-L path of the library file to be loaded.-lfun indicates the name of the library file.
Static create static Link Library. Shared create dynamic link library.

4. Find the dynamic library Method
1. Copy the Library to the/usr/lib and/lib directories.
2. Add the path to the library in the LD_LIBRARY_PATH environment variable. Export LD_LIBRARY_PATH = $ LD_LIBRARY_PATH:/c_pram/practice/lib/
3. Modify the/etc/lD. So. conf file, add the path of the Library to the end of the file, and execute sudo ldconfig to refresh.

V. . View symbols in the library
You can use LDD to view which libraries the executable files depend on.