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From: "xry111 at mengyan1223 dot wang" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/97787] [10/11 regression] 64bit mips lto: .symtab local
 symbol at index x (>= sh_info of y)
Date: Mon, 25 Jan 2021 10:16:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97787

--- Comment #21 from Xi Ruoyao <xry111 at mengyan1223 dot wang> ---
(In reply to Richard Biener from comment #20)
> Indeed already the name, .LTHUNK5.lto_priv.0, hints at that this should b=
e a
> local symbol.  Not sure why we end up with a .reloc then.
>=20
>         ld      $25,%got_disp(.LTHUNK5.lto_priv.0)($28)
> .LEHB26 =3D .
>         .reloc  1f,R_MIPS_JALR,.LTHUNK5.lto_priv.0
> 1:      jalr    $25
>=20
> this seems to be in _ZN4Sass6Parser16parse_parametersEv
>=20
> Maybe it's possible to reduce the testcase by bisecting the object files
> necessary to produce the bogus LTRANS assembly?  From that one can start
> reducing the source of the necessary object files.
>=20
> Another interesting bit would be to see the IPA dumps of the broken LTRANS
> unit.  If you add -fdump-ipa-all-details to the link command you should g=
et
> dump files alongside the ltrans temp files.

I can confirm that the workaround in gas (released in binutils-2.36) "fixes"
the problem.

Some function aliases named ".LTHUNK%d" are created in C++ FE (cp/method.c,
L232).  With LTO those are cloned as ".LTHUNK%d.lto_priv.%d".

Functions aliases should not be named ".xxx" IMO.  Perhaps names like
__gcc_lthunk.%d is better.=