Re: ANN: NetworkManager 0.9.9.98 (0.9.10-rc1) released

[Dan Williams <dcbw redhat com>]

On Thu, 2014-06-26 at 17:53 +0200, Vincent Bernat wrote:
>  ❦ 26 juin 2014 10:16 -0500, Dan Williams <dcbw redhat com> :
>
> > What does 'ldd' on your libreadline.so return?  Mine has:
> >
> >     linux-vdso.so.1 =>  (0x00007fff191fe000)
> >     libtinfo.so.5 => /lib64/libtinfo.so.5 (0x0000003473400000)
> >     libc.so.6 => /lib64/libc.so.6 (0x000000345ac00000)
> >     /lib64/ld-linux-x86-64.so.2 (0x000000345a800000)
>
> I have a similar output:
>
>         linux-vdso.so.1 (0x00007fff2c9fe000)
>         libtinfo.so.5 => /lib/x86_64-linux-gnu/libtinfo.so.5 (0x00007f98d71e2000)
>         libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f98d6e39000)
>         /lib64/ld-linux-x86-64.so.2 (0x00007f98d768a000)
>
> > so at least the dynamic linker knows that libtinfo (provided by ncurses)
> > is required here, and should load that in for the configure test
> > program.
>
> The dynamic linker knows but the linker used to build the executables
> may not resolve symbols from one object with the dependencies of another
> object. Only symbols of explicitely linked libraries may be used.
>
> GNU linker will try to resolve dependencies recursively but more modern
> linkers like the Gold linker doesn't. GNU linker may be told not to do
> that with -Wl,--no-add-needed. Reading the documentation, I see that
> --no-add-needed is now --no-copy-dt-needed-entries and I am a bit lazy
> to understand the explanation. Also read the --as-needed option:
>  https://sourceware.org/binutils/docs/ld/Options.html
>
> Some distribution enforce those flags.

Yeah, I forgot about gold.  I guess this is why pkgconfig is great,
since then you don't have to do a crapload of guesswork yourself (or in
the m4).  So, I suppose we add the readline m4 thing, but unfortunately
we need to hack it up ourselves, because it doesn't define READLINE_LIBS
even though it did all the work to find them...

Dan