[Bug ld/13817] Broken IFUNC support

[jakub at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13817

--- Comment #3 from Jakub Jelinek <jakub at redhat dot com> 2012-03-08 08:09:51 
UTC ---
I think you can keep x86_64 as is.  For i386 such PLT slots in the non-pic
binaries could stay, but if we don't have any registers that we can clobber,
the special alternate plt slots that would be needed would be complicated,
especially when there is no red zone on i386.
So perhaps reverting that patch for i386 or limiting it to non-PIE executables
is the best short time fix, until we figure out something that will work. 
Without spare registers/red zone the only alternatives I can imagine are either
one breaking the call/ret heuristics in the CPU (i.e. compute the desired
address in the return slot on the stack (after call) and then ret to it), or
using some __thread variable to hold where would we jump to.

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