GNU bug report logs -
#74216
[science team] flint build failure
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Reported by: Greg Hogan <code <at> greghogan.com>
Date: Tue, 5 Nov 2024 20:44:01 UTC
Severity: normal
Done: Greg Hogan <code <at> greghogan.com>
Bug is archived. No further changes may be made.
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Your bug report
#74216: [science team] flint build failure
which was filed against the guix package, has been closed.
The explanation is attached below, along with your original report.
If you require more details, please reply to 74216 <at> debbugs.gnu.org.
--
74216: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=74216
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems
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On Tue, Nov 12, 2024 at 9:01 AM Andreas Enge <andreas <at> enge.fr> wrote:
>
> Hello Greg,
>
> Am Tue, Nov 05, 2024 at 03:43:31PM -0500 schrieb Greg Hogan:
> > flint fails to build for me with the following error unless I include
> > as an input a newer gcc version.
>
> out of curiosity, what is your exact build architecture and processor
> line? The package builds without problems on my rather old laptop, and
> on the Guix build farms.
AWS r7a, AMD EPYC (4th Gen) 9R14
> I have asked someone who knows the flint code well, and they said it
> means that gcc has trouble realising how to expand the assembly code
> into load and stores and computation on machines with less than 8
> registers. Apparently it is a combination of compiler versions and
> processor specifics.
>
> Apart from that, I think we can apply your patch without worries, but
> I am just curious about what is happening.
>
> What is mildly worrying is that we already use the "--disable-assembly"
> configure flag; this could be a bug in the flint configuration.
>
> Andreas
Thanks for investigating this issue and pointing me in the right
direction. Turns out the flint package builds successfully when
upgrading GCC from 11.4 to 11.5. It looks like the processor was too
new.
When considering reproducible builds, this is a bug when building on
future, unknown hardware. For a time-bomb we can set back the clock,
and here we would need processor emulation?
Marking as done since the fix is to update a core package.
Greg
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flint fails to build for me with the following error unless I include
as an input a newer gcc version.
Greg
--8<---------------cut here---------------start------------->8---
CC fmpz_poly_q/add.c
In file included from src/fft_small/mpn_mul.c:17:
src/fft_small/mpn_mul.c: In function ‘_mpn_from_ffts_8’:
./src/crt_helpers.h:120:3: error: ‘asm’ operand has impossible constraints
120 | __asm__ ("addq %23,%q7\nadcq %21,%q6\nadcq %19,%q5\n\tadcq
%17,%q4\n\tadcq %15,%q3\n\tadcq %13,%q2\n\tadcq %11,%q1\n\tadcq
%9,%q0" \
| ^~~~~~~
./src/crt_helpers.h:378:5: note: in expansion of macro
‘add_ssssssssaaaaaaaaaaaaaaaa’
378 | add_ssssssssaaaaaaaaaaaaaaaa(z[7],z[6],z[5],z[4],z[3],z[2],z[1],z[0],
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
./src/crt_helpers.h:120:3: error: ‘asm’ operand has impossible constraints
120 | __asm__ ("addq %23,%q7\nadcq %21,%q6\nadcq %19,%q5\n\tadcq
%17,%q4\n\tadcq %15,%q3\n\tadcq %13,%q2\n\tadcq %11,%q1\n\tadcq
%9,%q0" \
| ^~~~~~~
./src/crt_helpers.h:378:5: note: in expansion of macro
‘add_ssssssssaaaaaaaaaaaaaaaa’
378 | add_ssssssssaaaaaaaaaaaaaaaa(z[7],z[6],z[5],z[4],z[3],z[2],z[1],z[0],
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
--8<---------------cut here---------------end--------------->8---
[diy9z2pwhjn6g5friaxcq32jpdx36b-flint-3.1.2.drv.gz (application/gzip, attachment)]
This bug report was last modified 188 days ago.
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