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I'm running RedHat 7.1 and I can't get the readline author's example program
to compile (nor any other readline-using program).  Any suggestions?  Here
are the error messages:

[root@db:/home/jake/weber/unix/readline-example]$gcc -lreadline rl.c /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../libreadline.so: undefined reference to tgetnum' /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../libreadline.so: undefined reference to tgoto' /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../libreadline.so: undefined reference to tgetflag' /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../libreadline.so: undefined reference to BC' /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../libreadline.so: undefined reference to tputs' /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../libreadline.so: undefined reference to PC' /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../libreadline.so: undefined reference to tgetent' /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../libreadline.so: undefined reference to UP' /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../libreadline.so: undefined reference to tgetstr' collect2: ld returned 1 exit status   0 Reply Jason 7/13/2003 11:30:16 PM See related articles to this posting "Jason" <jake1138@NO.SPAM.yahoo.com> writes: > I'm running RedHat 7.1 and I can't get the readline author's example program > to compile (nor any other readline-using program). Any suggestions? Here > are the error messages: > > [root@db:/home/jake/weber/unix/readline-example]$ gcc -lreadline rl.c
> reference to tgetnum'
> reference to tgoto'
> reference to tgetflag'
> reference to BC'
> reference to tputs'
> reference to PC'
> reference to tgetent'
> reference to UP'
> reference to tgetstr'
> collect2: ld returned 1 exit status

--
Maurizio Loreti                         http://www.pd.infn.it/~loreti/mlo.html
Dept. of Physics, Univ. of Padova, Italy              ROT13: ybergv@cq.vasa.vg

 0

Maurizio Loreti <mlo@foobar.it> wrote in message news:<rmy8z1u0pe.fsf@mlinux.pd.infn.it>...

Better make that "gcc rl.c -lreadline -ltermcap".
The order of sources and libraries matters, and so does spelling.

Cheers,

 0

"Maurizio Loreti" <mlo@foobar.it> wrote in message
news:rmy8z1u0pe.fsf@mlinux.pd.infn.it...
> "Jason" <jake1138@NO.SPAM.yahoo.com> writes:
>
> > I'm running RedHat 7.1 and I can't get the readline author's example
program
> > to compile (nor any other readline-using program).  Any suggestions?
Here
> > are the error messages:
> >
> > [root@db:/home/jake/weber/unix/readline-example]$gcc -lreadline rl.c > > /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../libreadline.so: undefined > > reference to tgetnum' > > /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../libreadline.so: undefined > > reference to tgoto' > > /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../libreadline.so: undefined > > reference to tgetflag' > > /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../libreadline.so: undefined > > reference to BC' > > /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../libreadline.so: undefined > > reference to tputs' > > /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../libreadline.so: undefined > > reference to PC' > > /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../libreadline.so: undefined > > reference to tgetent' > > /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../libreadline.so: undefined > > reference to UP' > > /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../libreadline.so: undefined > > reference to tgetstr' > > collect2: ld returned 1 exit status > > RTFM. gcc -lreadline -termcap rl.c > > -- > Maurizio Loreti http://www.pd.infn.it/~loreti/mlo.html > Dept. of Physics, Univ. of Padova, Italy ROT13: ybergv@cq.vasa.vg And what FM would that be? I can compile this just fine on a Debian system with just -lreadline, but not on either of the RedHat systems that I've tried. I can add -ltermcap or -lncurses and either one will allow it to compile though. Anyone care to shed some light on why? What does readline have to do with termcap or ncurses? By the way, thanks for your responses. -- Jason [ jake1138 AT yahoo DOT com ]   0 Reply Jason 7/15/2003 5:21:41 AM "Jason" <jake1138@NO.SPAM.yahoo.com> wrote in message news:<bf0316$sk7$1@terabinaries.xmission.com>... > And what FM would that be? This doesn't appear to be documented in the info pages ;-( You could have figured it out, though:$ nm -AD /usr/lib/lib*.so 2>/dev/null | grep ' tgetnum'
/usr/lib/libcurses.so:00029140 T tgetnum
/usr/lib/libncurses.so:00029140 T tgetnum
/usr/lib/libtermcap.so:00001e60 T tgetnum

> I can compile this just fine on a Debian system with just -lreadline, but
> not on either of the RedHat systems that I've tried.  I can add -ltermcap
> or -lncurses and either one will allow it to compile though.  Anyone care to
> shed some light on why?

Probably because libreadline.so on Debian has a dynamic dependency on
libtermcap.so or libncurses.so, while on RedHat it doesn't.

Run "ldd your_exe" to find which libreadline.so it uses, then
"ldd /path/to/libreadline.so" on both systems, and compare the results.

> What does readline have to do with termcap or ncurses?

It needs to redraw your screen (well, just the line on which you are typing),
and position your cursor. That's precisely what lib{curses,termcap} do.
Typing "info termcap" will tell you more.

Cheers,

 0
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