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Debian GNU/Linux Reference Guide
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13.7.3 Flex – a better Lex

flex is a fast lexical analyzer generator.

References for flex:

  • info flex (tutorial)

  • flex(1)

You need to provide your own main() and yywrap(), or your program.l should look like this to compile without a library (yywrap is a macro; %option main turns on %option noyywrap implicitly):

     %option main
     .|\n    ECHO ;

Alternatively, you may compile with the -lfl linker option at the end of your cc command line (like AT&T-Lex with -ll). No %option is needed in this case.

Debian GNU/Linux Reference Guide
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