Re: shrext and Autoconf

[Peter O'Gorman]

Fabrice Bauzac wrote:

> Hello there,
>
> First, thanks to everyone.  Maintaining libtool is far from being an
> easy task, while it is such a useful tool.
>
> I think I have discovered a problem in current versions of libtool
> (1.5.6 to 1.5.10 at least).
>
> I use libtool with Autoconf.  When "configure" is run, a file
> "libtool" is generated.  Let's call that file "GEN" instead of its
> real name to avoid confusion.  That file is created from different
> sources, notably configure itself and ltmain.sh.
>
> configure inserts several lines into GEN.  Among them:
>
> # Shared library suffix (normally ".so").
> shrext='.so'
>
> ltmain.sh inserts several lines into GEN.  Among them:
>
> # Darwin sucks
> eval std_shrext=\"$shrext_cmds\"
>
> The same ltmain.sh variable is now called shrext_cmds, but was called
> shrext before in GEN.  It means that there are problems with library
> extensions if we use Autoconf 2.59 with current versions of libtool.
>
> I'm the maintainer of a library, libcdaudio.  The shrext issue does
> not prevent my library from installing and functionning correctly on
> my Debian GNU/x86 system, but the library is installed as
> libcdaudio.1.0.0 instead of libcdaudio.so.1.0.0.
>
> I guess it has an impact on portability.
>
> Just to let you know.
>
> If you need to contact me, please CC: to my e-mail address, since I'm
> not a subscriber of bug-libtool.

Hi,

This issue is due to a mismatch in your libtool.m4 and ltmain.sh. I guess 
you have set up your PATH somewhat like mine "/usr/local/bin:/bin:/usr/bin" 
(well, I cut some stuff out). Assuming the first libtoolize in your path is 
/usr/local/bin/libtoolize and the first aclocal in your path is 
/usr/bin/aclocal then you will get an ltmain.sh from 
/usr/local/share/libtool/ and you'll get the m4 stuff for configure from 
/usr/share/aclocal/libtool.m4.

There are a couple of ways of dealing with this, the one I use is to always 
have all the autotools installed in each prefix where I want any of them. So 
I have /usr/local/bin/aclocal and /usr/local/bin/autoconf etc...

If the correct libtool.m4 is used then you will not see this problem. I 
think Gary fixed HEAD so that it checks that libtool was generated from the 
same versions of libtool.m4 and ltmain.sh.

Peter
--
Peter O'Gorman - http://www.pogma.com