flex 2.5.4a -- Bug?

[Nikos Balkanas]

Hi folks,

 

I've come across a rather strange behaviour which I would like to run with you. It seems to be system dependent. It didn't manifest on AIX or Solaris, but it did on Linux.

 

Specs: Linux Suse 6.2, kernel 2.2.10, flex 2.5.4 distribution, or 2.5.4a compliled from source, egcs-2.91.66.

 

Code:

 

%{

#include <stdio.h>

#include <ctype.h>

#include <string.h>

 

int lineno = 1;

%}

 

space [ \t]

sp {space}+

ws {space}*

newline \n

 

%option nounput

%option noyymore

%%

 

{newline}             { printf("Hello!\n"); }

\n                       { printf("Wrong-->\n"); }

.                         { ECHO; }

 

%%

 

Caveat: {newline} never expands correctly. Name of pattern doesn't matter. Output consists of echoed text + "Wrong->" in place of newlines. I traced it to the yy_accept array, which seems to be wrong. If I change the particular entry (from 2 to 1) and compile, I get lots of "Hello!"'s.

 

Any Ideas?

 

Thanks, Nikos.