淺談，C語言編譯原理的個人見解

預處理：c語言主要有兩種檔案 .c 和 .h 檔案，#include和#define都是預處理，主要包括巨集定義 檔案包含 條件編譯（eg：用於中英文版本使用一套原始碼的情況跟if else的區別就是可以是程式碼的精簡if else中的兩部分程式碼都會進行編譯，而條件編譯是不符合條件就不會進行編譯）三種，編譯器看見的檔案都是預處理之後的樣子。比如進行過巨集定義之後，預處理就是將巨集進行替換然後給編譯器進行識別，標頭檔案還可以插入到原始碼中。

編譯：物件是單個的標頭檔案和其中遞迴包含的標頭檔案組成的編譯單元。一般來說標頭檔案不直接參與編譯。c語言編譯的時候在windows系統下將生成 .obj 檔案，在unix系統中將生成 .o檔案

同時會進行語法的檢查，詞法分析，產生目的碼並進行優化，為全域性變數和區域性變數分配記憶體，並檢查函式是否定義，如果沒有定義會檢查函式是否宣告，若有函式宣告則就告訴編譯器函式的定義將晚些定義或者在其他檔案中進行定義，你先給我編譯通過。

連結：是將編譯生成的零散的二進位制機器程式碼組合成可以執行的檔案，一是解析其他檔案中的函式引用或其他引用，二是解析庫函式。

函式必須先宣告再引用，如果不定義函式的話 能編譯但是不能進行連結，連線錯誤的原因就是不能找到函式實體。

原因舉例：例如1.c檔案中宣告並且呼叫了一個函式，這個函式卻在2.c中進行的定義，連結就是在2.c中找到函式並對其進行解析，若是找不到就會進行錯誤提示：存在尚未解析的物件，宣告的外部變數也是這樣
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