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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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