[RFC] Fix float128 IFUNC relocations on ppc64le [BZ #21707]

[Florian Weimer]

On 07/05/2017 10:11 PM, Joseph Myers wrote:
> The installed compiler does -lgcc -lc -lgcc (roughly; -lgcc may actually 
> use -lgcc_s or -lgcc_eh, and -lc may vary for e.g. profiling).  -lc is a 
> linker script doing e.g. GROUP ( /lib64/libc.so.6 
> /usr/lib64/libc_nonshared.a  AS_NEEDED ( /lib64/ld-linux-x86-64.so.2 ) ).  
> The shared libgcc is also a linker script on some platforms.
> 
> The glibc build uses libc.so --as-needed ld.so --no-as-needed -lgcc 
> (again, roughly) (but libc.a -lgcc libc.a -lgcc in the static build case).
> 
> I suppose the suggestion is that we should both use -lgcc before linking 
> with libc, not just after (this being the issue involved in the present 
> case), and use -Wl,--start-group -Wl,--end-group around libc.so and ld.so, 
> both to be more similar to how things work with the installed compiler?  
> Which makes sense, but is also rather risky for this development stage.

Okay, then let's postpone the more general approach and use whatever
works on POWER for the release.

I assumed that the general fix would still be POWER-specific, but that
does not seem to be the case.

Thanks,
Florian