Example Analysis of Joint compilation dynamic Link Library in centos

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What is a dynamic link library

On Windows is dynamic linklibrary (DLL), suffix? Xxx.dll

On UNIX or Linux, it is Shared Library. The suffix is xxx.so

Compile the file into a dynamic link library in .so format

Gcc-o libme.so wso.c-shared

Compile wso.c into a libme.so library named me

Lib so is a prefix and suffix

Joint compilation

Gcc-L / root/myc/-l me ws.c-o newws

Folder location of-L dynamic link library

-l the name of the dynamic link library (excluding the leading lib and .so is the library name)

Then you will find that the compilation is successful, but the run still fails.

Failed because the operating system could not find it.

In fact, Linux, like windows, has a system library folder similar to system32. All kinds of public class libraries are placed here

There are two folders in CentOS that hold common libraries very similar to windows.

/ lib kernel level

/ usr/lib user system level

/ usr/lib64/ 64-bit system only

It doesn't matter if you leave your library blindly.

Solution method

Copy the SO file we made to the common library (cp command)

Then ldconfig (cache the dynamic library). Add new gadgets and need to update the cache)

Run newws successfully

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