Mailing List Archive: why doesn't readline-6 install libreadline.so symlink?

why doesn't readline-6 install libreadline.so symlink?

Sep 25, 2009, 9:31 PM

Post #1 of 6 (886 views)

I'm using portage-2.2_pre*. After upgrading to sys-libs/readline-6.0,
portage (naturally) kept /lib/libreadline.so.5 -> /lib/libreadline.so.5.2,
because a lot of programs needed it. I did emerge @preserved-rebuild, and
only one binary using libreadline.so.5.2 left: /usr/bin/gp, the
interactive interpreter of sci-mathematics/pari. Re-emerging it does not
help: headers from readline-6 are used, but the program links wirh
libreadline.so.5.2. I thought something is wrong in the pari's configure.
This package does not use autoconf, but a hand-written Configure script.
It seems all right. Then I found that /lib/libreadline.so symlink still
points to libreadline.so.5. This confuses the pari's Configure. I made it
to point to libreadline.so.6 by hand, and re-emerged pari. OK, gp now
links with libreadline.so.6.0. Why doesn't readline-6.0 ebuild install
this symlink?

After this re-emerging of pari, portage said

!!! existing preserved libs:
>>> package: sys-libs/readline-6.0_p3
* - /lib/libreadline.so
* used by /usr/bin/M2 (sci-mathematics/Macaulay2-1.2-r3)
* used by /usr/bin/Singular-3-0-4 (sci-mathematics/singular-3.0.4.4)
* used by /usr/bin/asy (media-gfx/asymptote-1.86)
* used by 111 other files

I already re-emerged these packages (at least, 3 shown) as a part of
emerging @preserved-rebuild after upgrading readline, and they were not in
the @preserved-rebuild set before I changed the libreadline.so symlink.
Does this mean that all of these packages used libreadline.so ->
libreadline.so.5? This is not good. I'm going to emerge @preserved-rebuild
again, to be sure that my system is in a self-consistent state.

It seems that keeping libreadline.so -> libreadline.so.5 after merging
readline-6.0 and unmerging readline-5.2 is a bad idea.

Andrey

Re: why doesn't readline-6 install libreadline.so symlink? [ In reply to ]

abcd at gentoo

Sep 25, 2009, 11:03 PM

Post #2 of 6 (867 views)

Permalink

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Andrey Grozin wrote:
> I'm using portage-2.2_pre*. After upgrading to sys-libs/readline-6.0,
> portage (naturally) kept /lib/libreadline.so.5 ->
> /lib/libreadline.so.5.2, because a lot of programs needed it. I did
> emerge @preserved-rebuild, and only one binary using libreadline.so.5.2
> left: /usr/bin/gp, the interactive interpreter of sci-mathematics/pari.
> Re-emerging it does not help: headers from readline-6 are used, but the
> program links wirh libreadline.so.5.2. I thought something is wrong in
> the pari's configure. This package does not use autoconf, but a
> hand-written Configure script. It seems all right. Then I found that
> /lib/libreadline.so symlink still points to libreadline.so.5. This
> confuses the pari's Configure. I made it to point to libreadline.so.6 by
> hand, and re-emerged pari. OK, gp now links with libreadline.so.6.0. Why
> doesn't readline-6.0 ebuild install this symlink?
>
> After this re-emerging of pari, portage said
>
> !!! existing preserved libs:
>>>> package: sys-libs/readline-6.0_p3
> * - /lib/libreadline.so
> * used by /usr/bin/M2 (sci-mathematics/Macaulay2-1.2-r3)
> * used by /usr/bin/Singular-3-0-4 (sci-mathematics/singular-3.0.4.4)
> * used by /usr/bin/asy (media-gfx/asymptote-1.86)
> * used by 111 other files
>
> I already re-emerged these packages (at least, 3 shown) as a part of
> emerging @preserved-rebuild after upgrading readline, and they were not
> in the @preserved-rebuild set before I changed the libreadline.so
> symlink. Does this mean that all of these packages used libreadline.so
> -> libreadline.so.5? This is not good. I'm going to emerge
> @preserved-rebuild again, to be sure that my system is in a
> self-consistent state.
>
> It seems that keeping libreadline.so -> libreadline.so.5 after merging
> readline-6.0 and unmerging readline-5.2 is a bad idea.
>
> Andrey
>
>

I'm not completely sure, but I think it doesn't install that symlink
because it (correctly) installs a /usr/lib/libreadline.so ldscript, that
tells the linker to link against /lib/libreadline.so.6, so long as the
linker looks at /usr/lib before /lib, which is usually the case, unless
"-L/lib" is passed to ld (by way of gcc). If you remove
/lib/libreadine.so, then everything will Just Work, and portage will
forget that that file ever existed as soon as you merge a package (any
package). I'm not sure what the correct behavior of
FEATURES="preserve-libs" should actually be in this case, but I think
portage may need to look a little closer at the SONAME, and only
preserve that file (like the old preserve_old_lib) or preserve only that
symlink and what it links to, not everything that points at that.

- --
Jonathan

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Re: Re: why doesn't readline-6 install libreadline.so symlink? [ In reply to ]

zmedico at gentoo

Sep 25, 2009, 11:25 PM

Post #3 of 6 (849 views)

Permalink

Jonathan Callen wrote:
> I'm not completely sure, but I think it doesn't install that symlink
> because it (correctly) installs a /usr/lib/libreadline.so ldscript, that
> tells the linker to link against /lib/libreadline.so.6, so long as the
> linker looks at /usr/lib before /lib, which is usually the case, unless
> "-L/lib" is passed to ld (by way of gcc).

It seems to be the same issue as this bug:

http://bugs.gentoo.org/show_bug.cgi?id=284844

--
Thanks,
Zac

Re: Re: why doesn't readline-6 install libreadline.so symlink? [ In reply to ]

vapier at gentoo

Sep 26, 2009, 5:04 AM

Post #4 of 6 (871 views)

Permalink

On Saturday 26 September 2009 02:03:38 Jonathan Callen wrote:
> I'm not completely sure, but I think it doesn't install that symlink
> because it (correctly) installs a /usr/lib/libreadline.so ldscript, that
> tells the linker to link against /lib/libreadline.so.6

correct

> so long as the linker looks at /usr/lib before /lib, which is usually the
> case, unless "-L/lib" is passed to ld (by way of gcc)

incorrect -- link order doesnt matter here with readline-6
-mike

Re: Re: why doesn't readline-6 install libreadline.so symlink? [ In reply to ]

grozin at woodpecker

Sep 26, 2009, 7:48 AM

Post #5 of 6 (841 views)

Permalink

On Sat, 26 Sep 2009, Mike Frysinger wrote:
>> so long as the linker looks at /usr/lib before /lib, which is usually the
>> case, unless "-L/lib" is passed to ld (by way of gcc)
> incorrect -- link order doesnt matter here with readline-6
Here's a specific example: sci-mathematics/pari-2.3.4-r1. It has a
hand-written Configure script (not configure). It searches for
libreadline.so in a list of directories, and sees that it points to
libreadline.so.5 (this is after libreadline-5 has been unmerged). So, it
adds -l libreadline.so.5 to the linking flags. Clearly, this is not the
desired behaviour. What can be done to avoid it?

Andrey

Re: Re: why doesn't readline-6 install libreadline.so symlink? [ In reply to ]

vapier at gentoo

Sep 26, 2009, 1:42 PM

Post #6 of 6 (846 views)

Permalink

On Saturday 26 September 2009 10:48:53 Andrey Grozin wrote:
> On Sat, 26 Sep 2009, Mike Frysinger wrote:
> >> so long as the linker looks at /usr/lib before /lib, which is usually
> >> the case, unless "-L/lib" is passed to ld (by way of gcc)
> >
> > incorrect -- link order doesnt matter here with readline-6
>
> Here's a specific example: sci-mathematics/pari-2.3.4-r1. It has a
> hand-written Configure script (not configure). It searches for
> libreadline.so in a list of directories, and sees that it points to
> libreadline.so.5 (this is after libreadline-5 has been unmerged). So, it
> adds -l libreadline.so.5 to the linking flags. Clearly, this is not the
> desired behaviour. What can be done to avoid it?

the configure script is broken and it should be fixed. linking directly
against a SONAME is wrong.
-mike

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