On Mon, Mar 18, 2013 at 06:18:58PM +0100, Richard Biener wrote: > I was asking for the ifunc selector to be > Overridable by ld_preload or a similar mechanism at dynamic load time.
Please don't. Calling an ifunc resolver function in another library is just asking for trouble with current glibc. Why? Well, the other library containing the resolver function may not have had any dynamic relocations applied. So if the resolver makes use of the GOT (to read some variable), it will use unrelocated addresses. You'll segfault if you're lucky. For anyone playing with ifunc, please test out your great ideas on i386, ppc32, mips, arm, etc. *NOT* x86_64 or powerpc64 which both avoid the GOT in many cases. -- Alan Modra Australia Development Lab, IBM
