Linking error in visual studio C++ 2010

I am using MS visual studio 2010 for building a C project. My project uses flex and bison for parsing purpose. When I build the project there is no error in compiling but error in linking.
Following is the error:


proparse.obj:could not resolved the pro_lex referenced in the function pro_parse

Now,pro_lex is the function defined in the lex file. Lets say pro.lex. I used flex to generate the pro.c .And this function is defined and called as follows:

In prolex.c

#ifndef YY_ABCD
#define YY_ABCD 1

extern int pro_lex (void);

#define YY_ABCD int pro_lex (void)
#endif

YY_ABCD{ /*This is the main function which does all the lexical function
.....
........}


And the yacc file proparse.y generates two file using bison viz proparse.h and proparse.c . The functions pro_lex and pro_parse are defined in the proparse.c as follows.

In proparse.c


#define yyparse pro_parse
#define yylex pro_lex

int yylex(void); /*defined in lex file
.
.
.
pro_parse(); /*parsing function is called.


Could you please let me know what can be the reason for it? I would also like to know if I can set some rules to link certain object files in the IDE. I think it is getting this error
becasue of the inability of linking. I would be glad if you could let me know if I can set some rules so that these two files can link.

Many thanks in advance.

Quote:

---

Originally Posted by __bairagi

is no error in compiling but error in linking.
Following is the error:

proparse.obj:could not resolved the pro_lex referenced in the function pro_parse

---

That couldn't be the exact error message from the Microsoft linker. Please post the exact message you are receiving.

Quote:

---

Now,pro_lex is the function defined in the lex file. Lets say pro.lex. I used flex to generate the pro.c .And this function is defined and called as follows:

---

You posted only function declarations, not actual function implementations. Where are the actual functions implemented?

Also, use code tags when posting code. Then there is no need for "......" in your post.

Quote:

---

Could you please let me know what can be the reason for it?

---

All a declaration does is tell the compiler that a function exists somewhere. The linker now wants to know more -- where is the function? That's the reason for the error.

Regards,

Paul McKenzie