Hi Junichi,

while using cow-shell on an amd64 system I came across a 32bit program
running there and producing LD_PRELOAD warnings because the 64bit
library obviously can't be preloaded in this case.
The program is proprietary binary only, so no chance to get a 64bit
version of this.

I can live with this little annoyance, but perhaps it's something to
think about: making cowdancer multilib capable and setting LD_PRELOAD in
a multilib compatible way.


Andreas

Hi,

I think this request is reasonable; if I can overcome the technical
barriers, this should probably be implemented.

libcowdancer only depends on the libc, so it's going to be
straight-forward.  You could even just extract the 32-bit binary from
i386 package and try running. Building it is another exercise, but
that should be trivial.

Do you know if there is such a way? I don't quite know offhand if it
is possible already.


regards,
	junichi

Hi Junichi,

Junichi Uekawa wrote:

I just tried with the lib from the i386 package and it works if the
library is found in standard paths, e.g. the following seems to work:

  LD_LIBRARY_PATH=/usr/lib32/cowdancer:/usr/lib/cowdancer
  LD_PRELOAD=libcowdancer.so
  32bitcommand

So with /usr/lib{,32}/cowdancer/libcowdancer.so it currently does not work.

Thinking about this again, there are more packages relying on LD_PRELOAD
 that are affected by this multilib issue.
E.g. fakeroot sets the following:

beckmann@cake:~/bin$ fakeroot
root@cake:~/bin# echo $LD_PRELOAD
libfakeroot-sysv.so
root@cake:~/bin# echo $LD_LIBRARY_PATH
/usr/lib/libfakeroot:/usr/lib64/libfakeroot:/usr/lib32/libfakeroot

And the fakeroot package may also be a ressource for how to do the
multilib build.


Andreas

block 460924 by 466880
thanks

Hi Junichi,

I started to work on biarch support for libcowdancer (based on the
fakeroot biarch build system), building on amd64 works so far, but
testing failed due to #466880


Andreas