如何在thrift python客户端中设置rpc超时？(How to set rpc timeout in thrift python client?)

 据推测，您已在构建中包含lib.c ，并在main.c包含#include 。 这导致编译对象（例如， lib.o和main.o ）各自具有函数的定义。 链接器选择它（因为它检查所有目标文件，而编译器一次生成一个，因此无法检测两个或多个对象文件多次定义的实例）并抱怨多个定义。 
 
 作为指导原则，永远不要#include .c文件。 
 
 相反，将函数的声明（也称为原型）放在头文件中（比如lib.h ） 
 
 #ifndef LIB_H_INCLUDED
 #define LIB_H_INCLUDED

 #include "defs.h"

 void getUserName();
 void getCourse (index);

  // etc

 #endif
 
 和#include在每个需要使用这些函数的.c文件中。 这提供了足够的信息，因此编译器可以检查您是否正确调用函数。 然后将函数定义（也就是它们的实现）放在lib.c 。 lib.c还需要#include "lib.h" ，因此（除其他外）编译器可以检查标头中函数的声明是否与定义匹配。 
 
 我还在头部放置了包含警卫。 我会把它作为练习让你去谷歌找出原因。 

Presumably, you have included lib.c in your build, as well as #includeing it in main.c. This causes the compiled objects (say, lib.o and main.o) to each have definitions of the functions. The linker picks this up (since it examines all the object files, whereas the compiler produces one at a time, so cannot detect instances where two or more objects files define something more than once) and complains about multiple definitions.
 
As a guideline, never #include a .c file.
 
Instead, place declarations (aka prototypes) of your functions in a header file (say lib.h)
 
 #ifndef LIB_H_INCLUDED
 #define LIB_H_INCLUDED

 #include "defs.h"

 void getUserName();
 void getCourse (index);

  // etc

 #endif
 
and #include that in every .c file that needs to use the functions. This provides enough information so the compiler can check if you are calling the functions correctly. Then place the function definitions (aka their implementations) in lib.c. lib.c will also need to #include "lib.h", so (among other things) the compiler can check if the declarations of the functions from the header match the definitions.
 
I've also placed include guards in the header. I'll leave it as an exercise for you to google to work out why.