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Example using bison and flex with cygwin on Windows

Date: 2007-02-07  |   Modified: 2009-12-14  |   Tags: bison_flex, c   |   10 Comments
Here is an example of how to use bison and flex (yacc and lex) with cygwin on windows xp.
  1. Go to http://www.cygwin.com/, install Cygwin including bison 2.3-1, flex 2.5.4a-3, gcc-core 3.4.4-1, and make 3.81-1.

  2. Create a file called "simple.flex" in "c:\temp": 
    %{                                                                                          
    #include "simple.tab.h"                                                                     
    extern int line_number;                                                                     
    %}                                                                                          
    %option noyywrap                                                                            
     
    %%                                                                                          
    "float"         { printf("FROM FLEX FLOAT %s\n", yytext); return FLOAT;  }                  
    "int"           { printf("FROM FLEX INT %s\n", yytext); return INT; }                       
    [;] {  return *yytext; }                                                                    
    [_a-zA-Z][_a-zA-Z0-9]* { printf("FROM FLEX IDENTIFIER: %s\n", yytext); return IDENTIFIER; } 
    [ \t\r]+          /* eat up whitespace */                                                   
    [\n ...
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