Dynamic linker

Joakim Tjernlund joakim.tjernlund at transmode.se
Wed Mar 23 20:07:17 UTC 2011


bruce bushby <bruce.bushby at gmail.com> wrote on 2011/03/23 20:19:06:
>
> Over the past two weeks I've tried many variations, unfortunately without any success.
>
> I've tried building on these platforms:
> Fedora 12
> Fedora 14
> Ubuntu Natty 11.04
>
> Buildoot:
> buildroot-dailysnapshot
> buildroot-2011-02
>
> uclibc:
> 0.9.31
> 0.9.32-rc2
>
> Building "readline" without "ncurses" and with the dependency on "ncurses" removed:
> [root at dlxarm01 buildroot]# grep -i tgetent make-readline-without-ncurses.log
> checking for tgetent... no
> checking for tgetent in -ltermcap... no
> checking for tgetent in -ltinfo... no
> checking for tgetent in -lcurses... no
> checking for tgetent in -lncurses... no
> [root at dlxarm01 buildroot]#
>
> BUT....readline still compiles.....this could be due to the fact that I am unable to run "autoreconf" when building "readline"?
>
> I then run "make ncurses" and then re-run "make readline" to see if it's uses "ncurses" for "tgetent":
> [root at dlxarm01 buildroot]# grep -i tgetent make-readline-with-ncurses.log
> checking for tgetent... no
> checking for tgetent in -ltermcap... no
> checking for tgetent in -ltinfo... no
> checking for tgetent in -lcurses... yes
> [root at dlxarm01 buildroot]#
>
> So "readline" does find "ncurses".

Yes, but probably doesn't link with it?
do a readelf -d libreadline.so.6, see ncurses it listed in NEEDED:
 0x00000001 (NEEDED)                     Shared library: [libncurses.so.5]
 0x00000001 (NEEDED)                     Shared library: [libc.so.6]

>
> My Fedora 12 X64 desktop uses "termcap" rather then "ncurses":
> [bruce at core readline-6.2]$ ./configure | grep -i tgetent
> checking for tgetent... no
> checking for tgetent in -ltermcap... yes
> [bruce at core readline-6.2]$
>
> I will try and add "readelf" to my build and forward the results of checking "libreadline" and "libncurses"
>
> I really appreciate the help!
>
> I've been stuck for so long now I thought of offering a $200.00 reward to anybody who can fix it.
>
> Bruce
>
> On Wed, Mar 23, 2011 at 6:15 PM, Joakim Tjernlund <joakim.tjernlund at transmode.se> wrote:
> vapierfilter at gmail.com wrote on 2011/03/23 18:57:04:
> >
> > On Wed, Mar 23, 2011 at 1:19 PM, Joakim Tjernlund wrote:
> > > From: Salvatore CRO <salvatore.cro at st.com>
> > >> We have been looking at the same problem in the last days...
> > >> Libreadline needs either libncurses or libtermcap to provide these symbols.
> > >> Even though one of the two is supposed to be linked to libreadline (depending on
> > >> Certain logic in its build configure), it seems this is not actual the case.
> > >> We'll keep investigating into libreadline package configure.
> > >
> > > Unless someone changed this, uClibc needs to have either
> > > libncurses or libtermcap linked to readline(needs to be in
> > > readline's NEEDED list) or uClibc will fail. glibc doesn't require this, but I believe the specs says that all deps should be listed.
> >
> > i'm pretty sure that's the intended behavior we still have.  i wonder
> > if we should FAQ this ...
> > -mike

> Yes, since this is not the first time this problem has happened.
>
>  Jocke



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