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                            # 禁止函數被優化掉

## 例子

	#if (GCC_VERSION > 4000)
	#define DEBUG_FUNCTION __attribute__ ((__used__))
	#define DEBUG_VARIABLE __attribute__ ((__used__))
	#else 
	#define DEBUG_FUNCTION
	#define DEBUG_VARIABLE
	#endif
	
	DEBUG_FUNCTION void
	debug_bb (basic_block bb)
	{
	  dump_bb (bb, stderr, 0);
	}

## 技巧

上面的例子是gcc的源碼。使用gcc的擴展功能——函數屬性`__attribute__ ((__used__))`，可以指定該函數是有用的，不能被優化掉。

詳情參見[gcc手冊](https://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function-Attributes)

## 貢獻者

xmj


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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