Re: Alternate versions of the same shared library?
On Wed, Sep 22, 1999 at 12:36:17AM -0400, Camm Maguire wrote:
> Greetings! Is there any way to maintain alternate versions of the
> same shared library on a Debian system? (i.e. same soname) One can
> have two packages which conflict with each other, but I was thinking
> about some run-time switching functionality, like in the
> 'alternatives' system, so that one could choose between an
> experimental but fast shared lib, and the trusted but slower one, at
> runtime. I've tried several things, but lintian disallows most of them.
One way to do this is to include a wrapper script with your
alternate-library version and place the libs in a package-specific
directory. I use the following script under Irix to replace the
GLX-dependent libraries with bare-X11 Mesa equivalents when running tools
to non-GLX platforms:
mesa
----
#!/bin/sh
export _RLD_LIST _RLD64_LIST _RLDN32_LIST
_RLD_LIST=/usr/lib/libm.so:/usr/local/Mesa/lib/libGL.so:DEFAULT
_RLD64_LIST=/usr/lib64/libm.so:/usr/local/Mesa/lib64/libGL.so:DEFAULT
_RLDN32_LIST=/usr/lib32/libm.so:/usr/local/Mesa/lib32/libGL.so:DEFAULT
exec $*
From man ld.so the Linux equivalents would be LD_LIBRARY_PATH and
LD_AOUT_LIBRARY_PATH. LD_PRELOAD could also be used to replace just a few
routines.
The /usr/lib/lib*.so.N could then be placed under alternatives control if
the maintainers all cooperated, with the alternatives available in the
wrapped environments.
This is for libblas?
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