Nested invocation examples of shared libraries in Linux

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Reference URL:
Nested routines: https://my.oschina.net/moooofly/blog/506466.html
Linux cannot find a dynamic link library. So file resolution Https://www.cnblogs.com/xudong-bupt/p/3698294.html
Linux shared library, static library, dynamic library detailed:
Https://www.cnblogs.com/sunsky303/p/7731911.html

Create a new test folder and create a new file within this folder:

Vim Hello.cpp

Vim Hello.h

Vim Usehello.cpp

Vim Usehello.h

1. Compiling the dynamic link library

gcc -o hello.so -fpic -shared  -I.   hello.cpplsldd hello.so

gcc -o usehello.so -fpic -shared  -I. -Wl,-rpath=/home/yzw/test  usehello.cpp  hello.so  lsldd usehello.so

Remember that the shared library is written after the. cpp file, otherwise it will not load the dynamic-link library

gcc -o main  -I. -Wl,-rpath=/home/yzw/test  main.cpp usehello.solsldd main

./main '

Note:

1. -I followed by the path of the header file,-I. Indicates the search header file under the current directory
2. -wl,-rpath=/home/yzw/test represents a shared library address that specifies a priority search, first your address must be in the/etc/ld.so.conf file, or in the/etc/ld.so.conf.ld directory.
3. Additional Notes from link one:
   Ldconfig naming is associated with running a program city, and there is no relationship at compile time, so you still need to add precedence to the specified library path at compile time, such as:-wl,-rpath=/home/yzw/test

Nested invocation examples of shared libraries in Linux