Flex build error
- by incrediman
I'm totally new to flex.
I'm getting a build error when using flex. That is, I've generated a .c file using flex, and, when running it, am getting this error:
1>lextest.obj : error LNK2001: unresolved external symbol "int __cdecl isatty(int)" (?isatty@@YAHH@Z)
1>C:\...\lextest.exe : fatal error LNK1120: 1 unresolved externals
here is the lex file I'm using (grabbed from here):
/*** Definition section ***/
%{
/* C code to be copied verbatim */
#include <stdio.h>
%}
/* This tells flex to read only one input file */
%option noyywrap
%%
/*** Rules section ***/
/* [0-9]+ matches a string of one or more digits */
[0-9]+ {
/* yytext is a string containing the matched text. */
printf("Saw an integer: %s\n", yytext);
}
. { /* Ignore all other characters. */ }
%%
/*** C Code section ***/
int main(void)
{
/* Call the lexer, then quit. */
yylex();
return 0;
}
As well, why do I have to put a 'main' function in the lex syntax code? What I'd like is to be able to call yylex(); from another c file.
