Re: new gcc8/gcc10 build breakage between 9.99.63 and 9.99.67

[Thomas Klausner <wiz%NetBSD.org@localhost>]

On Thu, Jun 18, 2020 at 08:25:00AM +0200, Thomas Klausner wrote:
> I've updated my system from 9.99.63 to 9.99.67.
> 
> I did a bulk build just before that and one right after, i.e. I have
> binary packages from June 16.
> 
> After the upgrade, gcc8 and gcc10 do not build any longer because of
> differences in the stage2 and stage3 files.
> 
> gcc8:
> 
> gmake[3]: Leaving directory '/scratch/lang/gcc8/work/build'
> Comparing stages 2 and 3
> warning: gcc/cc1obj-checksum.o differs
> warning: gcc/cc1objplus-checksum.o differs
> Bootstrap comparison failure!
> gcc/crtbegin.o differs
> gcc/crtend.o differs
> gcc/crtbeginS.o differs
> gcc/crtendS.o differs
> gcc/crtbeginT.o differs
> gmp/mpf/init.o differs
> ...
> 
> gcc10:
> 
> gmake[3]: Leaving directory '/scratch/lang/gcc10/work/build'
> Comparing stages 2 and 3
> warning: gcc/cc1obj-checksum.o differs
> warning: gcc/cc1objplus-checksum.o differs
> Bootstrap comparison failure!
> gcc/build/version.o differs
> gcc/version.o differs
> gcc/crtbegin.o differs
> gcc/crtend.o differs
> gcc/crtendS.o differs
> gcc/crtbeginT.o differs
> gmp/mpf/init2.o differs
> gmp/mpf/set_z.o differs
> gmp/mpf/iset_str.o differs
> gmp/mpf/clear.o differs
> 
> Does anyone have an idea what could have changed to break this?

Maya pointed me at http://gnats.netbsd.org/55370 and indeed, when I
build gcc8 outside of my sandbox (i.e., no null mounts involved) it
builds fine.
 Thomas