Re: Compilation failure.

[Neil Jerram <neil@ossau.uklinux.net>]

Frank J. R. Hanstick <trog24@comcast.net> writes:

> Hello,
> 	Thank you for responding.

Hi Frank,

Here's another response, but I'm afraid a very late one...  I've added
CC to the list, for the record and for other MacOS users.

> 	I went to
> http://www.gnu.org/software/guile/docs/faq/guile-faq.html  (the FAQ
> pointed to from http://www.gnu.org/software/guile/ guile.html) and
> searched for the error and it was no where to be  found.  I then went
> to http://www.gnu.org/software/guile/docs/faq/OLD- 
> guile-faq.html and came up with the same result.  I had done this
> before emailing; but, did it again just to be sure I had not missed
> anything.  Is there another FAQ page?

Yes, there was, in the Guile distribution itself.  But I see now that
this was confusing, so I've removed it that file and merged the
information that was in it (about Readline/Editline) into
http://www.gnu.org/software/guile/docs/faq/guile-faq.html.

> 	libedit was installed.  The source of the installation is most
> likely Darwin since I had not installed anything BSD related since
> installing the MacOS.  There was no readline installed; therefore, I
> installed readline-5.2.  That corrected the rl_pending_input" error;
> but, now get the following:
>
> ld: warning multiple definitions of symbol _rl_free_line_state
> .libs/readline.o definition of _rl_free_line_state in section
> (__TEXT,__text)
> /usr/local/lib/libreadline.dylib(signals.so) definition of
> _rl_free_line_state
> ld: warning multiple definitions of symbol _rl_cleanup_after_signal
> .libs/readline.o definition of _rl_cleanup_after_signal in section
> (__TEXT,__text)
> /usr/local/lib/libreadline.dylib(signals.so) definition of
> _rl_cleanup_after_signal

Those multiple definitions would occur if libreadline was being picked
up during the build but not when configure was run.

Could you consider

- looking at the part of guile-readline/config.log that covers looking
  for rl_cleanup_after_signal, to see if there are any clues there

- running configure again with CPPFLAGS and LDFLAGS set like this:

CPPFLAGS=-I/usr/local/include LDFLAGS=-L/usr/local/lib ./configure [your usual options]

> ld: warning multiple definitions of symbol _PC
> /usr/local/lib/libreadline.dylib(terminal.so) definition of _PC
> /usr/lib/gcc/powerpc-apple-darwin8/4.0.1/../../../libncurses.dylib
> (lib_tputs.o) definition of _PC
> ld: warning multiple definitions of symbol _UP
> /usr/local/lib/libreadline.dylib(terminal.so) definition of _UP
> /usr/lib/gcc/powerpc-apple-darwin8/4.0.1/../../../libncurses.dylib
> (lib_termcap.o) definition of _UP
> ld: warning multiple definitions of symbol _BC
> /usr/local/lib/libreadline.dylib(terminal.so) definition of _BC
> /usr/lib/gcc/powerpc-apple-darwin8/4.0.1/../../../libncurses.dylib
> (lib_termcap.o) definition of _BC

I don't know about these, but it looks as though libreadline.dylib
already includes those curses symbols.  Maybe the -lncurses isn't
needed on MacOS?

Based on Guile's guile-readline/configure.in and Gnulib's readline.m4,
it looks like that might be the case.  guile-readline/configure.in
tries pretty hard to find and use a curses library:

  for termlib in ncurses curses termcap terminfo termlib ; do
     AC_CHECK_LIB(${termlib}, tgoto,
                  [LIBS="-l${termlib} $LIBS"; break])
  done

but Gnulib is more careful:

    dnl On some systems, -lreadline doesn't link without an additional
    dnl -lncurses or -ltermcap.
    dnl Try -lncurses before -ltermcap, because libtermcap is unsecure
    dnl by design and obsolete since 1994. Try -lcurses last, because
    dnl libcurses is unusable on some old Unices.
    for extra_lib in "" ncurses termcap curses; do
      LIBS="$am_save_LIBS $LIBREADLINE"
      if test -n "$extra_lib"; then
        LIBS="$LIBS -l$extra_lib"
      fi
      AC_TRY_LINK([#include <stdio.h>
#include <readline/readline.h>],
        [readline((char*)0);],
        [gl_cv_lib_readline=" -l$extra_lib"])
      if test "$gl_cv_lib_readline" != no; then
	break
      fi
    done

Probably Guile (1.8.x) should be do the same as Gnulib does.  If
you're still in a position to try that out, I'll work out a patch.

Regards,
        Neil