On Wed, Apr 22, 2015 at 09:04:04PM +0200, Jakob Bohm wrote: > For parallel installation of OpenSSL 1.0.2a and the OS > supplied OpenSSL 1.0.1 (with patches equivalent to the > latest release), modify SHLIB_VERSION_NUMBER from 1.0.0 > to 1.0.2 in the folliwing files from the tarball: The ABI version really is 1.0.0. Symbol versioning is the right way to distinguish between 1.0.[012]. The Debian OpenSSL build does symbol versioning to avoid conflicts between multiple libraries that support the 1.0.0 ABI. Yes, the ABI compatibility is only backwards compatibility, so applications that link to a newer version of the library at compile time, need to use the same or newer library at run-time. Applications using a non-system library need to record a suitable RPATH (often using "$ORIGIN" is a good bet if the application ships a copy of the library). Ideally applications would use the system supplied library, otherwise patching becomes rather difficult... -- Viktor.
