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X-Authentication-Warning: slinky.cs.nyu.edu: pechtcha owned process doing -bs
Date: Tue, 13 May 2003 12:07:02 -0400 (EDT)
From: Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To: cygwin AT cygwin DOT com
To: Chu Wang <c DOT wang AT hud DOT ac DOT uk>
cc: cygwin AT cygwin DOT com
Subject: Re: Help: problems with unreferenced yywrap
In-Reply-To: <Pine.GSO.4.44.0305131157140.393-100000@slinky.cs.nyu.edu>
Message-ID: <Pine.GSO.4.44.0305131205310.393-100000@slinky.cs.nyu.edu>
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On Tue, 13 May 2003, Igor Pechtchanski wrote:

> On Tue, 13 May 2003, Chu Wang wrote:
>
> > Hi, all
> >
> > I tried to compile and install a package under Cygwin, and the package
> > requires lex and yacc tool.  I have installed bison and flex into
> > Cygwin, but the configuration process didn't find yywrap... actually I
> > don't know what the yywrap is for and have few ideas about lex and yacc.
> > I just want to install the package and run it. Part of the configuration
> > results like below:
> >
> > creating cache ./config.cache
> > checking for name and version number... \c
> > concepts 0.3f
> > checking for bison... \c
> > bison -y
> > checking for flex... \c
> > flex
> > checking for yywrap in -lfl... \c
> > no
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > checking for gcc... \c
> > gcc
> >
> > A Makefile is created after configuration. When I tried to make the
> > files, errors appeared like below:
> >
> > gcc -c  -DHAVE_CONFIG_H -g concept.c
> > gcc -c  -DHAVE_CONFIG_H -g hash.c
> > gcc -c  -DHAVE_CONFIG_H -g list.c
> > gcc -c  -DHAVE_CONFIG_H -g main.c
> > gcc -c  -DHAVE_CONFIG_H -g panic.c
> > gcc -c  -DHAVE_CONFIG_H -g print.c
> > gcc -c  -DHAVE_CONFIG_H -g relation.c
> > gcc -c  -DHAVE_CONFIG_H -g set.c
> > gcc -c  -DHAVE_CONFIG_H -g context.c
> > gcc -c  -DHAVE_CONFIG_H -g input.c
> > gcc -c  -DHAVE_CONFIG_H -g arrow.c
> > flex  scanner.lex
> > mv lex.yy.c scanner.c
> > bison -y -d  parser.yacc
> > mv y.tab.c parser.c
> > mv y.tab.h parser.h
> > gcc -c  -DHAVE_CONFIG_H -g scanner.c
> > gcc -c  -DHAVE_CONFIG_H -g parser.c
> > gcc -c  -DHAVE_CONFIG_H -g lib.c
> > gcc -g -o concepts concept.o hash.o list.o main.o panic.o print.o relation.o set.o context.o input.o arrow.o scanner.o parser.o lib.o
> > scanner.o(.text+0x92e): In function `yylex':
> > /cygdrive/c/work/concept/lex.yy.c:793: undefined reference to `_yywrap'
> > scanner.o(.text+0x111f): In function `input':
> > /cygdrive/c/work/concept/lex.yy.c:1142: undefined reference to `_yywrap'
> > collect2: ld returned 1 exit status
> > make: *** [concepts] Error 1
> >
> > I checked with previous email archieves, and found yywrap is a
> > function in flex library libfl.a. However, I have installed flex ,
> > what else do I need to get the package installed?
> >
> > Any suggestion will be highly appreciated! Thanks a lot.
> >
> > Regards,
> > Chu
>
> Chu,
>
> Note the underlined line above.  "configure" is not all-knowing, and
> sometimes makes mistakes.  In this particular case, the program that
> tested for yywrap in libfl.a failed (possibly for an unrelated reason),
> and configure assumed that yywrap is not available in -lfl, and, judging
> by the lower commands, decided not to link it in.  This probably is a bug
> in the configure script.
>
> To find out why the test program failed, look in "config.log" for the line
> "checking for yywrap in -lfl".  The exact failed program, and the nature
> of the failure (i.e., compiler errors) should be right around that line.
> Once that is fixed (which might require editing "configure", or rerunning
> autoconf if the project uses "configure.in").
                                              ^
                                              , your project should compile fine.

Nasty, nasty "Send" key combination.  Bad fingers, bad! :-D
	Igor
-- 
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     |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski
    '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!

Knowledge is an unending adventure at the edge of uncertainty.
  -- Leto II


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