libopcodes In function 'SUBWORDSISF': third-party/opcodes/cgen-ops.h:323: multiple definition

本文链接：https://blog.youkuaiyun.com/u012140133/article/details/51943605

本文解决Linux环境下编译libopcodes库时遇到的重复定义问题，通过修改宏定义为static inline解决编译错误。

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在 linux 编译库 libopcodes (2007) 提示：

In function 'SUBWORDSISF':
third-party/opcodes/cgen-ops.h:323: multiple definition of 'SUBWORDSISF'

问题在于重复定义。具体而言，extern 变量或函数被包含时，可能被多个文件包含。因为 gcc 是对每个文件单独编译然后在对所有文件一起链接的，所以，在不声明全局变量的前提下，编译时不会报告错误而链接时会发生重复定义。

解决方法有两个：

1. 对于单个文件多次包含，可在被包含文件首末加上 #ifndef ** #define ** #endif

2. 对于多个文件多次包含，只能将被包含内容声明为 static

我们按提示找到 third-party/opcodes/cgen-ops.h 第 323 行，发现是一个 SEMOPS_INLINE 类型的宏函数，就是它被重复定义了。所以现在将其声明为 static 。其他类似的函数也要这么声明。

---28: #define SEMOPS_INLINE extern inline
+++28: #define SEMOPS_INLINE static inline

---299: QI SUBWORDSIQI (SI, int);
---300: HI SUBWORDSIHI (SI, int);
---301: SI SUBWORDSFSI (SF);
---302: SF SUBWORDSISF (SI);
---303: DI SUBWORDDFDI (DF);
---304: DF SUBWORDDIDF (DI);
---305: QI SUBWORDDIQI (DI, int);
---306: HI SUBWORDDIHI (DI, int);
---307: SI SUBWORDDISI (DI, int);
---308: SI SUBWORDDFSI (DF, int);
---309: SI SUBWORDXFSI (XF, int);
---310: SI SUBWORDTFSI (TF, int);

+++299: SEMOPS_INLINE QI SUBWORDSIQI (SI, int);
+++300: SEMOPS_INLINE HI SUBWORDSIHI (SI, int);
+++301: SEMOPS_INLINE SI SUBWORDSFSI (SF);
+++302: SEMOPS_INLINE SF SUBWORDSISF (SI);
+++303: SEMOPS_INLINE DI SUBWORDDFDI (DF);
+++304: SEMOPS_INLINE DF SUBWORDDIDF (DI);
+++305: SEMOPS_INLINE QI SUBWORDDIQI (DI, int);
+++306: SEMOPS_INLINE HI SUBWORDDIHI (DI, int);
+++307: SEMOPS_INLINE SI SUBWORDDISI (DI, int);
+++308: SEMOPS_INLINE SI SUBWORDDFSI (DF, int);
+++309: SEMOPS_INLINE SI SUBWORDXFSI (XF, int);
+++310: SEMOPS_INLINE SI SUBWORDTFSI (TF, int);

---312: UQI SUBWORDSIUQI (SI, int);
---313: UQI SUBWORDDIUQI (DI, int);
+++312: SEMOPS_INLINE UQI SUBWORDSIUQI (SI, int);
+++313: SEMOPS_INLINE UQI SUBWORDDIUQI (DI, int);