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課程編譯：C的基本訓練

問題1：項目文件 - 00_04.c
- 終端：編譯和運行正常。
- Eclipse Neon：在控制檯中生成但不顯示輸出。 02_01.c
- 項目：

00_04.c

#include <stdio.h> 
#include <stdlib.h> 

int main(void) { 
    puts("!!!Hello World!!!"); /* prints !!!Hello World!!! */ 
    return EXIT_SUCCESS; 
} 

Eclipse控制檯輸出

15:49:04 **** Incremental Build of configuration Debug for project NewProject **** 
make all 
make: Nothing to be done for `all'. 

15:49:04 Build Finished (took 99ms) 

問題2：（MacOS X的GCC與工具鏈創建） - 終端：不識別包含的文件

02_01.c

#include <stdio.h>   // Notice the library included in the header of this file 
#include <stdlib.h> 

#include "myLibrary.h"  // Notice that myLibrary.h uses different include syntax 

myLibrary.h

#ifndef MYLIBRARY_H_ 
#define MYLIBRARY_H_ 

void function1(void); 
void function2(void); 

#endif /* MYLIBRARY_H_ */ 

myLibrary.c

void function1(void){ 
    puts("It works :)"); 
} 

void function2(void){ 
    //This function does nothing as well 
} 

端子輸出

Undefined symbols for architecture x86_64: 
    "_function1", referenced from: 
     _main in 02_01-7f91e4.o 
ld: symbol(s) not found for architecture x86_64 
clang: error: linker command failed with exit code 1 (use -v to see invocation) 

Answer 1

如果你正在運行cc 02_01.c的命令。然後編譯器試圖在文件（02_01.c）或包含的文件（myLibrary.h）中尋找main()函數。

在02_01.c和myLibrary.h中沒有main()函數，所以你得到那個編譯器錯誤。

要修復，讓你的02_01.c看起來像這樣。

#include <stdio.h>   // Notice the library included in the header of this file 
#include <stdlib.h> 

#include "myLibrary.c"  // Notice that myLibrary.h uses different include syntax 
int main(void) 
{ 
    function1(); 
    return 0; 
}