Re: cmake 3.31.7 bootstrap illegal instruction on Sparc32 (qemu) ?

[Andrew Randrianasulu <randrianasulu%gmail.com@localhost>]

On Sat, Dec 6, 2025 at 5:57 AM Andrew Randrianasulu
<randrianasulu%gmail.com@localhost> wrote:
>
> On Sat, Dec 6, 2025 at 4:35 AM Andrew Randrianasulu
> <randrianasulu%gmail.com@localhost> wrote:
> >
> > On Fri, Dec 5, 2025 at 4:06 PM Valery Ushakov <uwe%stderr.spb.ru@localhost> wrote:
> > >
> > > On Fri, Dec 05, 2025 at 11:35:23 +0300, Andrew Randrianasulu wrote:
> > >
> > > > So, I am still trying to build things from slightly older pkgsrc tree,
> > > > and Cmake 3.31.7 fails witch attached gzipped log, ending with illegal
> > > > instruction.
> > > >
> > > > Qemu line:
> > > > qemu-system-sparc -hda sparc-netbsd-15g-compressed.qcow2 -m 1536 -g
> > > > 1024x768x24 -M SS-20 -smp 3 -accel tcg,thread=multi,tb-size=256
> > > >
> > > > qemu --version:
> > > > qemu-system-sparc --version
> > > > QEMU emulator version 9.1.50 (v9.1.0-1687-gf0cfd06786-dirty)
> > > > Copyright (c) 2003-2024 Fabrice Bellard and the QEMU Project developers
> > > >
> > > > Note that this configuration survived gnutls , libbluray,
> > > > libtheora-1.2.0  builds
> > > > so generally it works ?
> >
> > even installing pre-build pkg by Vom513 still gives illegal instruction
> >
> > https://mastodon.online/@Andrew_R/115670749252048951
> >
> > _atomic_fetch_add_4 in /usr/pkg/lib/libatomic.so.3 ..


0xede93374 in __atomic_fetch_add_4 () from /usr/pkg/lib/libatomic.so.3
(gdb) disassemble /s __atomic_fetch_add_4
Dump of assembler code for function __atomic_fetch_add_4:
   0xede9335c <+0>:       save  %sp, -96, %sp
   0xede93360 <+4>:       mov  %i0, %g2
   0xede93364 <+8>:       ld  [ %i0 ], %g1
   0xede93368 <+12>:      unknown
   0xede9336c <+16>:      mov  %g1, %i0
   0xede93370 <+20>:      add  %g1, %i1, %g3
=> 0xede93374 <+24>:      casa  [ %g2 ] #ASI_P, %g1, %g3
   0xede93378 <+28>:      unknown
   0xede9337c <+32>:      cmp  %g3, %i0
   0xede93380 <+36>:      unknown
   0xede93384 <+40>:      mov  %g3, %g1
   0xede93388 <+44>:      rett  %i7 + 8
   0xede9338c <+48>:      nop
End of assembler dump.

Hm ...

attempt at building libatomic inside this VM also failed (even without
any -smp  or -cpu params)


> >
> > even with cpu set to
> >
> > qemu-system-sparc -hda sparc-netbsd-15g-compressed.qcow2 -m 1536 -g
> > 1024x768x24 -M SS-20 -smp 3 -accel tcg,thread=multi,tb-size=256 -cpu
> > TI-SuperSparc-60
>
> Strange, bug still exist on
>
> ./qemu/build/qemu-system-sparc --version
> QEMU emulator version 10.1.92 (v10.2.0-rc2-31-g2257f52a97-dirty)
> Copyright (c) 2003-2025 Fabrice Bellard and the QEMU Project developers
>
> compiled for i586 on Slackware 15.0
>
> Next try: put VM to real netBSD amd64 partition, try qemu from there
>
>
> >
> >
> > >
> > > I had varying success with qemu sparc.  Incidentally, I was trying to
> > > build cmake too (that I needed to build some other project, not in
> > > pkgsrc).
> > >
> > > cmake and/or modern c++ compilers are hogs... so I'm not surprised
> > > that particular combination (builing cmake on qemu sparc) might have
> > > reached some darker corners where qemu is not that stable.
> > >
> > > That was an year ago or so, so my memory is hazy.  But IIRC, in the
> > > end it was faster to loan an ultra1 from a friend setup it and build
> > > cmake there.
> > >
> > > PS: My first attempt to build cmake was natively on a (diskless)
> > > javastataion.  That gave me a new reference for "exercise in futility"
> > > (I think I gave up after couple of weeks or so).  That's when I turned
> > > to qemu.  For scale: I also needed to build cmake on macos/ppc (for
> > > the same project).  My mini g4 (1.25GHz cpu with 1G ram) took about a
> > > week to build cmake from macports from scratch.  That time was mostly
> > > spent builidng gcc10 and gcc14, though.  cmake proper was about a day
> > > only, I think.
> > >
> > > -uwe