Undefined Reference To yywrap

Question

I have a simple \"language\" that I\'m using Flex(Lexical Analyzer), it\'s like this:

/* Just like UNIX wc */
%{
int chars = 0;
int words = 0;
int lines = 0;         


        

Answer 1

The scanner calls this function on end of file, so you can point it to another file and continue scanning its contents. If you don't need this, use

%option noyywrap

in the scanner specification.

Although disabling yywrap is certainly the best option, it may also be possible to link with -lfl to use the default yywrap() function in the library fl (i.e. libfl.a) provided by flex. Posix requires that library to be available with the linker flag -ll and the default OS X install only provides that name.