* Carlos O'Donell: > +Care should be taken when packaging such application with a package manager, > +particularly the scenario where an optimized library is being removed. With > +certain package managers, particularly rpm, the newer version of the Twice “particularly”. > +application is installed first, which means that for a period of time during > +the upgrade all applications that use the library may start with a mixed set of > +libraries e.g. the old library from the feature-based search path, and new Commas arount e.g.? > +libraries from the upgrade. To avoid this scenario the new library version > +should delete all known optimized libraries in the post-install phase. There is a different mechanism: Debian has patched glibc to disable hwcap subdirectors if the file /etc/ld.so.nohwcap exists. You now list the AT_PLATFORM directories (determined by the kernel on most architectures) along the regular hwcaps directories, although they are handled somewhat differently. For example, on s390x, if you have a “z15” machine (as indicated by AT_PLATFORM), the “z13” subdirectory is not selected. ldconfig will add it to the cache, but it will not be used at run time. I'm not sure if your proposed description gives readers the right idea what happens. Thanks, Florian
