Dynamic linking to specific .so versions

Daniel Jacobowitz drow@false.org
Tue Oct 31 17:53:00 GMT 2006

On Tue, Oct 31, 2006 at 06:07:19PM +0100, Lluís Batlle wrote:
> Hi,
> I've noticed that "ld" doesn't link the final ELF to the ".so"
> library, but to the ".so.X", where X is a number. At least in my Linux
> ELF system.
> For instance, "readelf" may show that for a given ELF program:
> 0x00000001 (NEEDED)                     Shared library: [libX11.so.6]
> I'd like to know what is the algorithm of choosing ".so.X", and not
> ".so.X.Y", or ".so". Is that hardcoded and unchangeable in ld? Is that
> Linux-ELF specific? Can that be changed?

It is the choice of each library.  Take a look at the ELF generic ABI,
specifically "DT_SONAME".

Daniel Jacobowitz

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