Re: xterm fails to link against local ncurses

[Thomas Dickey]

On Thu, 25 Nov 2010, Christian Ebert wrote:

> * Thomas Dickey on Thursday, November 25, 2010 at 15:57:12 -0500
> > On Thu, 25 Nov 2010, Christian Ebert wrote:
> > > * Thomas Dickey on Thursday, November 25, 2010 at 12:43:42 -0500
> > > > What does the link command for xterm look like?  It's more likely on
> > > > that end, than in ncurses.
> > >
> > > Sorry to be a noob; what exactly do you mean by "link command"?
> >
> > something like
> >
> > gcc -o xterm main.o charproc.o ... -L /usr/local/lib/ -lncurses
> >
> > In xterm's makefile, it's done at the end of plink.sh
>
> You mean what becomes of
> xterm$x : $(OBJS1)
>         $(SHELL) $(srcdir)/plink.sh $(LINK) $(LDFLAGS) -o $@ $(OBJS1) $(LIBS) 
> $(EXTRA_LOADFLAGS)
>
> ?
>
> /bin/sh ./plink.sh gcc -g -O2 -I/usr/local/include -I/sw/include  
> -L/usr/local/lib -L/sw/lib -o xterm button.o cachedGCs
> ..o charproc.o charsets.o cursor.o data.o doublechr.o fontutils.o input.o 
> linedata.o main.o menu.o misc.o print.o ptydata
> ..o scrollback.o screen.o scrollbar.o tabs.o util.o xstrings.o xtermcap.o 
> VTPrsTbl.o TekPrsTbl.o Tekproc.o charclass.o pr
> ecompose.o wcwidth.o -L/sw/lib -L/usr/X11/lib -lXft -lXrender -lfontconfig 
> -lfreetype -lX11 -L/usr/X11/lib -lXaw8 -lXmu
> -lXt -lX11 -lSM -lICE -lXau -L/usr/X11/lib -lXt -lX11 -lSM -lICE -ltermcap

and at the end of "plink.sh", _it_ does an

eval $LINKIT

For debugging the script, I sometimes add an echo command, e.g.,

echo "$LINKIT"

The text above seems to have the -L's in the right order, but a potential
problem is in omitting some library just because the linker doesn't report
an error.

I see "-ltermcap" above.  Perhaps that's a symbolic link to the copy of
ncurses that you don't want.  xterm tries to find a termcap library unless
you give this option (see INSTALL):

  --disable-full-tgetent  disable check for termcap library

and that might be the problem (it's not using "-lncurses", so the linker
skips over your /usr/local/lib.  This chunk in aclocal.m4 hints at the
possible matches, depending on that option:

if test "$cf_full_tgetent" = yes ; then
    cf_TERMLIB="termcap termlib ncurses curses"
    cf_TERMTST="buffer[[0]] == 0"
else
    cf_TERMLIB="termlib ncurses curses"
    cf_TERMTST="0"
fi

(if you also have a "termlib" in the "wrong" place, then that's an 
additional problem)

> > plink.sh tries to remove as many -l's as it can, to make the binaries
> > less sensitive to changes in the libraries.  (It also has some special
> > case to handle the PCRE library).
> >
> > On some systems, it's hard to mix static and shared libraries (but I
> > seem to recall you're building shared libraries).
> >
> > > > xterm has an additional complication, using plink.sh to filter out
> > > > unnecessary libraries.  I made that feature optional in another
> > > > configure script (though I'm thinking the problem is more along the
> > > > lines of not giving the right type of -L or rpath option).
> > >
> > > Could it be that because freetype is under /sw it gets the upper
> > > hand?
> >
> > It might be - referring to ncurses' shlib script - something in the
> > list of directories given in the DYLD_LIBRARY_PATH environment
> > variable.
>
> Normally you do not set this environment variable on MacOS X.
>
> c
> --
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>
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--
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net