https://github.com/1010code/c--shared-library-tutorial

c++-shared-library-tutorial
https://github.com/1010code/c--shared-library-tutorial

Last synced: 5 days ago
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c++-shared-library-tutorial

• Host: GitHub
• URL: https://github.com/1010code/c--shared-library-tutorial
• Owner: 1010code
• Created: 2022-08-28T14:09:48.000Z (over 2 years ago)
• Default Branch: main
• Last Pushed: 2024-04-14T07:00:52.000Z (10 months ago)
• Last Synced: 2024-04-28T05:22:51.139Z (10 months ago)
• Language: C++
• Size: 5.86 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
## 建立函式庫

建立標頭檔，定義所需的函式。

```c

# mylib.h

#include

#include

#include

using namespace std;

void say(string message);

void say(vector vec);

```

實作函式庫內容。

```c

# mylib.cpp

#include

#include

#include

using namespace std;

void say(string message){

  cout << message << endl;

}

void say(vector vec){

  for(int c=0; c -I{include dirs} to inform gcc where to look when you #include something.

> -L tells gcc about paths to look into for libraries, and -l{libname} links against a library.

另外也可以將編譯好的 object file `.o` 檔，轉換成 `.so`:

```sh

gcc hello.o -shared -o libhello.so

```

## 其他方法

### 直接在編譯時給予外部函式庫路徑

```sh

g++ -o main main.cpp ./mylib.cpp -std=c++11 

```

### 或是先編譯成 o 檔

compile those source files to object files, first:

```sh

g++ -c -o mylib.o ./mylib.cpp

```

> -c tells gcc not to try and link things together

```sh

g++ -o main mylib.o main.cpp -std=c++11

```

## 重點整理

Search Path and Library Linking Flags.

- -l[linalg]

  - => Links to shared library or shared object - Specifically, it links to linalg.dll on Windows, liblinalg.so (on Unix-like oses like Linux, BSD, AIX, …) or linalg.dylib on MacOSX.

- -L[/path/to/shared-libraries]

  - => Add search path to shared libraries, directory containing *.so, *.dll or *.dlyb files such as libLinearAlgebra.so depending on the current operating system.

- -I[/path/to/header-files]

  - Add search path to header files (.h) or (.hpp).

## Reference

- [C++ Creating Shared Library on macOS](https://www.youtube.com/watch?v=PRUR_bN3r-E).

- [[stackoverflow] Properly Link Libraries in the Command Line](https://stackoverflow.com/questions/33110118/properly-link-libraries-in-the-command-line)

- [CPP/C++ Compiler Flags and Options](https://caiorss.github.io/C-Cpp-Notes/compiler-flags-options.html)

- [什麼是SO檔案格式?](https://template.city/so/)

- [Static vs Dynamic Libraries](https://www.bogotobogo.com/cplusplus/libraries.php)

- [windows dll 和 Linux so 的異同](https://www.796t.com/content/1546146567.html)

- [Linux靜態庫與共享庫的使用](https://jasonblog.github.io/note/linked_and_loader/linux_jing_tai_ku_yu_gong_xiang_ku_de_shi_yong.html)