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From: "syq at debian dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug d/103604] [12 Regression] trunk 20210506 fails to build in
 libphobos on mips64el-linux-gnu
Date: Tue, 14 Dec 2021 01:44:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103604

--- Comment #11 from YunQiang Su <syq at debian dot org> ---
(In reply to Iain Buclaw from comment #10)
> (In reply to YunQiang Su from comment #6)
> >=20
> > This patch can solve this problem: of course, we need to back port it to
> > gcc-10/gcc-11 also.
> >=20
> > The problem is due to that:=20
> >     N32 and N64 uses different "struct stat"
> >     In the older version, __USE_FILE_OFFSET64 may be not defined for N64
> >          while now, it is defined.
> Is this patch backwards compatible though?  Perhaps the value of
> `__USE_FILE_OFFSET64` should instead be fixed to match that of the target.

ohhh. you are right. I misunderstand this problem.=