I'm building a weird set of libraries and would like libtool to help out a bit by providing some mechanism to modify the SONAME placed into the .so file.
X has three versions of the Xaw library; version 6, 7 and 8 (cooresponding to the .so major version numbers, which are the same across all supported X platforms). Unfortunately, we want to be able to install all three at the same time, and permit applications to select which to link against. To make this possible on the widest range of platforms, this means that we should really use different filenames for the various libraries: Version 6 Xaw -> libXaw6.so.6.0.1, libXaw6.so.6, libXaw6.so Version 7 Xaw -> libXaw7.so.7.0.0, libXaw7.so.7, libXaw7.so Version 8 Xaw -> libXaw8.so.8.0.0, libXaw8.so.8, libXaw8.so These are obviously easy enough to generate with libtool, and I've done so. However, I have an additional constraint -- existing applications using these libraries must continue to operate normally. These existing applications use version-less filenames: Version 6 Xaw -> libXaw.so.6.0.1, libXaw.so.6 Version 7 Xaw -> libXaw.so.7.0.0, libXaw.so.7 Version 8 Xaw -> libXaw.so.8.0.0, libXaw.so.8, libXaw.so We could use these same filenames again, but you'll note that only one version can link to the bare .so name, leaving applications at the mercy of the system to decide which version of the library they will use. There is another way to solve the problem; we can change the SONAME in the versioned filename varients: Version 6 Xaw -> libXaw6.so.6.0.1 SONAME=libXaw.so.6 Version 7 Xaw -> libXaw7.so.7.0.0 SONAME=libXaw.so.7 Version 8 Xaw -> libXaw8.so.8.0.0 SONAME=libXaw.so.8 With this setup, existing applications will find the right library, and new applications will be able to select the appropriate version to link against. The help I need from libtool is to permit me to change the 'libname' placed into the SONAME of the library at link time. Is there a better way of solving this problem? Or is my plan something that would be acceptable in a distributed version of libtool? If so, I'll send a patch. -keith
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