CODEWITHSUNDEEP
compiler-errors
Nazanin
Nazanin

Reputation: 38

Undefined Reference To yywrap()

Wrote the following code in flex and c file has generated but compiler shows "undefined reference to 'yywrap' " error.

%{
int nchar;
int nline;
%}
%%
[\n] {nline++;}
. {nchar++;}
%%
void main(void){
yylex();
printf("%d%d,nchar,nline");
}

Questions like this have been asked and all the answers were based on ignoring yywrap function like adding #define yywrap() 1 Which in this case the program runs but doesn't work but I want it to work.

Upvotes: 1

Views: 2407

Answers (1)

Gudarzi
Gudarzi

Reputation: 575

You can define it yourself like this: 

int yywrap() {  
// open next reference or source file and start scanning  
if((yyin = compiler->getNextFile()) != NULL) {  
  line = 0; // reset line counter for next source file
  return 0;  
   }
return 1;
}

Or decide not to use it: 

    %option noyywrap

Or install it; which is like this for a redhat-based os: 

    yum -y install flex-devel
    ./configure && make

Upvotes: 1

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