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Re: Help: problems with unreferenced yywrap

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 parser.c
> mv 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


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 "").
      |\      _,,,---,,_
ZZZzz /,`.-'`'    -.  ;-;;,_
     |,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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