[Bug target/80600] hidden symbol `__cpu_model' is referenced by DSO

["coypu at sdf dot org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80600

--- Comment #10 from coypu <coypu at sdf dot org> ---
(In reply to H.J. Lu from comment #9)
> 
> This may break Linux.  You may want to investigate if this approach:
> 
> commit 6e6c7fc1e15525a10f48d4f5ac2edd853e2f5cb7
> Author: nsz <nsz@138bc75d-0d04-0410-961f-82ee72b054a4>
> Date:   Fri Nov 11 17:31:07 2016 +0000
> 
>     [i386][musl] Add cpuinfo to static libgcc only on *-musl*
>     
>     The __cpu_indicator_init and __cpu_model symbols are not safe to use
>     from shared libgcc_s.so from ifunc resolvers, so since gcc-6, only
>     the definitions from static libgcc.a are used, however the symbols
>     are kept in libgcc_s as well for backward compatibility (with
>     appropriate symbol version).  On targets without such backward
>     compatibility concern add cpuinfo to the static library only (this
>     avoids running the ctor, reduces libgcc_s size and elf abi concerns
>     about the versioned symbols).
> 
> works for you.

Thanks. if I understand it correctly, it breaks backwards compatibility, so
would rather avoid it. With my (not upstreamable) patch we have a working GCC,
so it's not a pressing issue for us, although it seems to affect many other
platforms.