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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/104117] [9,10,11,12 Regression] Darwin ppc64 uses
 invalid non-PIC address to access constants (in PIC code).
Date: Sun, 06 Feb 2022 13:23:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104117

--- Comment #19 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Sergey Fedorov from comment #18)
> (In reply to Iain Sandoe from comment #17)
> > FTR: this is the patch I came up with:
>=20
> Does it affect only ppc64? I am asking since if it affects ppc32, then I
> rather rebuild gcc10ppc and gcc11ppc installed on 10.6.8 Rosetta and on
> 10A190. While if it matters only for ppc64, then rebuilding on 10.5.8 is
> enough.

The problem is triggered by deciding to force a constant to memory, in
principle that could happen for ppc32 as well [e.g. for a double constant] =
(so
far, we have not seen an example).  Since we build the compiler
'mdynamic-no-pic' for performance, it is not going to show up there [since
SYMBOL_REF is a valid address in that case].

Once the patch is tested, posted and applied to master, then we will surely
back port to the effected branches.=