Re: Patch: RFC: make libltdl search for version-specific symlinks first

[Andrew Haley <aph at redhat dot com>]

Michael Koch writes:
 > Am Montag, 23. August 2004 19:10 schrieb Thomas Fitzsimmons:
 > > Hi,
 > >
 > > This patch makes libltdl search for a version-specific DSO before
 > > searching for the corresponding versionless DSO.  This will allow
 > > multiple ABI-incompatible versions of libgcj to be installed in
 > > parallel in the same prefix.  Currently, this isn't possible
 > > because libltdl finds only the versionless .so symlink, so only the
 > > most
 > > recently-installed libgcj will find the correct version of the peer
 > > library.
 > >
 > > Currently, libltdl searches for the peer library like this: first
 > > it looks for lib-gnu-java-awt-peer-gtk.la.  Failing that, it looks
 > > for lib-gnu-java-awt-peer-gtk.so.  This patch adds an intermediate
 > > search for lib-gnu-java-awt-peer-gtk.so.n, where n is the ABI
 > > version number.
 > >
 > > Comments?
 > 
 > I talked with Matthias Klose about this patch privately and we now 
 > think this patch is bit of wrong. I searches the *.la file before the 
 > *.so.version file but the *.so.version is hardcoded in the *.la file. 
 > So if an app is compiled again *.so.version and *.la points to 
 > *.so.version+1 it loads the wrong library.

Ah, right.  This is because the .la file has no version number in its
name.  Nasty.

 > The solution would be to try to load the *.so.version before trying 
 > the *.la file.

I guess so, but this is all getting rather horrible.  Paging Tom
Tromey...

Andrew.