extern “C" 的作用為何？
有時候在寫 C/C++ 程式，引用了某些 Library，編譯會出現錯誤，後來查找原因
FFmpeg 編譯： undefined reference to ‘av_frame_alloc()’
原來該 Library 是以純 C 寫的，需要以 extern "C"來讓編譯器識別。
看來我真的對 C/C++ 不熟呢～😜
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