c++ text.txt

---------------  C++  ---------------

command -> action -> output


## 1 ##

g++ -c main.cpp -> compiles main.cpp -> main.o object file

NOTE: 

- To include external header files out of standard path (/usr/include/) use:
g++ -c main.cpp -I<ext-lib-install-path>/include

- The include folder contains the .hpp files, which are the declarations for
the classes, functions, etc.


## 2 ##

g++ main.o -o my-app -> links the libraries -> my-app executable

NOTE: 

- C++ dynamic libraries are of kind lib<name-of-lib>.so (libsqlite3.so).
Similarly static/archive are lib<name-of-lib>.a

- To link external library use:
g++ main.o -o my-app -l<name-of-lib> (without lib and, so or a).

- To link external library out of standard path (/usr/lib/) use:
g++ main.o -o my-app -L<ext-lib-install-path>/lib -l<name-of-lib>


## 3 ##

./my-app -> runs the executable -> output in console or external window, etc.

NOTE: 

- If external dynamic library is not in standard path (/usr/lib/) use:
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:<ext-lib-install-path>/lib && ./my-app

- Generally, library files (.so and .a) are in lib folders, if not so adjust accordingly.

Ref:
* https://www.sfml-dev.org/tutorials/2.5/start-linux.php
* https://iq.opengenus.org/create-archive-library-in-cpp
* https://iq.opengenus.org/link-static-archive-file-in-gcc
* http://www.yolinux.com/TUTORIALS/LibraryArchives-StaticAndDynamic.html


PS:
On Windows .a extension is .lib and .so is .dll 


#### Generate dynamic library ####

- g++ -fPIC -c library.cpp
- g++ -shared library.o -o liblibrary.so


#### Generate static library ####

- g++ -c library.cpp -o librarystat.o
- ar rcs liblibrarystat.a librarystat.o