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From: zimoun <zimon.toutoune@HIDDEN>
Date: Wed, 21 Oct 2020 10:12:14 +0200
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Dear,

Using Guix 58af4c9, the package =E2=80=99sbcl=E2=80=99 seems not-reproducib=
le.

The output of =E2=80=9Cguix challenge=E2=80=9D is:

--8<---------------cut here---------------start------------->8---
  differing files:
    /lib/sbcl/contrib/sb-rt.fasl
    /lib/sbcl/contrib/uiop.fasl
    /lib/sbcl/contrib/sb-cover.fasl
    /lib/sbcl/contrib/sb-capstone.fasl
    /lib/sbcl/contrib/sb-executable.fasl
    /lib/sbcl/contrib/sb-bsd-sockets.fasl
    /lib/sbcl/contrib/sb-simple-streams.fasl
    /lib/sbcl/contrib/sb-queue.fasl
    /lib/sbcl/contrib/sb-gmp.fasl
    /lib/sbcl/contrib/sb-aclrepl.fasl
    /lib/sbcl/contrib/sb-sprof.fasl
    /lib/sbcl/contrib/sb-grovel.fasl
    /lib/sbcl/contrib/sb-posix.fasl
    /lib/sbcl/contrib/asdf.fasl
    /lib/sbcl/contrib/sb-mpfr.fasl
    /lib/sbcl/contrib/sb-cltl2.fasl
    /lib/sbcl/contrib/sb-concurrency.fasl
    /lib/sbcl/contrib/sb-md5.fasl
    /lib/sbcl/contrib/sb-introspect.fasl
    /lib/sbcl/contrib/sb-rotate-byte.fasl
    /lib/sbcl/sbcl.core
    /bin/sbcl
    /share/sbcl/src/runtime/coreparse.o
    /share/sbcl/src/runtime/sbcl

1 store items were analyzed:
  - 0 (0.0%) were identical
  - 1 (100.0%) differed
  - 0 (0.0%) were inconclusive
--8<---------------cut here---------------end--------------->8---

which is confirmed by the experimental Data Service webpage:

https://data.guix-patches.cbaines.net/revision/4e0498c4d3f5ef03ac5afa4a3e57=
0205c10c28c5/package-derivation-outputs?search_query=3Dsbcl&output_consiste=
ncy=3Dnot-matching&system=3Dx86_64-linux&target=3Dnone&after_path=3D&limit_=
results=3D&all_results=3Don


I do not know if the patches in =E2=80=99staging=E2=80=99 will fix this.

Note that this issue does not imply that the build system
=E2=80=99asdf-build-system/sbcl=E2=80=99 is or will be not reproducible.  H=
owever, this
issues cuts any Diverse Double Compiling attempt.

All the best,
simon




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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: zimoun <zimon.toutoune@HIDDEN>
Subject: bug#44112: Acknowledgement (SBCL is not reproducible)
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44112: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D44112
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Subject: bug#44112: SBCL is not reproducible
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--=-=-=
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zimoun <zimon.toutoune@HIDDEN> skribis:

> Using Guix 58af4c9, the package =E2=80=99sbcl=E2=80=99 seems not-reproduc=
ible.
>
> [...]
>
> I do not know if the patches in =E2=80=99staging=E2=80=99 will fix this.
>
> Note that this issue does not imply that the build system
> =E2=80=99asdf-build-system/sbcl=E2=80=99 is or will be not reproducible. =
 However, this
> issues cuts any Diverse Double Compiling attempt.

IIRC, when compiling, SBCL puts the timestamp of the source file in the
compiled file. It's not a problem when just doing basic compilation
because the source files' timestamps have been set to "1970-01-01".

However, some packages generate some source files at build time, usually
containing things like data type sizes fetched from system header in
order to use C libraries with FFI. The timestamp of a generated file
is the current time, therefore the build is not reproducible.

IIRC, SBCL itself is built in 2 stages. First its core is compiled
using another Common Lisp implementation (currently clisp in Guix), then
the complete SBCL is compiled using the core compiled in stage 1. There
is probably also an embedded timestamp issue here (coming for clisp,
from SBCL, or both) causing the reproducibility issue.

The patches currently in the staging branch don't have any effect on
the generation of source files or on the format of the compiled files,
so they will not help with this issue.

Removing this source file timestamp from compiled files would simplify
things. Maybe nothing really depends on it and it would be possible...

--=-=-=
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--=-=-=--




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Hi,

Thank you for the explanations.

On Wed, 21 Oct 2020 at 14:42, Guillaume Le Vaillant <glv@HIDDEN> wrote:

> However, some packages generate some source files at build time, usually
> containing things like data type sizes fetched from system header in
> order to use C libraries with FFI. The timestamp of a generated file
> is the current time, therefore the build is not reproducible.

This is an issue.  Do you think it is affordable to fix these
timestamps to 1970-01-01?


> IIRC, SBCL itself is built in 2 stages. First its core is compiled
> using another Common Lisp implementation (currently clisp in Guix), then
> the complete SBCL is compiled using the core compiled in stage 1. There
> is probably also an embedded timestamp issue here (coming for clisp,
> from SBCL, or both) causing the reproducibility issue.

Yes.  But I have replaced this "clisp" by ECL or by SBCL itself.
Still unreproducible.

Out-of-scope with this bug report, my aim is to have a fixed point:

 - first compile SBCL with CLISP (using the 2 stages you describe):
produce SBCL-A
 - second recompile SBCL with the previous SBCL-A (again using the 2
stages): produce SBCL-B
 - third recompile SBCL with the previous SBCL-B (again using the 2
stages): produces SBCL-C

The binary SBCL-A is not deterministic probably because of CLISP (and
CLISP should be fixed but that's another story :-)).
However, SBCL-B and SBCL-C must be deterministic.  And ideally
bit-to-bit identical but that's another story. :-)
And they are not; from my experiments at least.

Even, you could do the same procedure replacing CLISP by ECL,
producing SBCL-{A,B,C}-bis.  Then SBCL-C and SBCL-C-bis should be
bit-to-bit identical.


> Removing this source file timestamp from compiled files would simplify
> things. Maybe nothing really depends on it and it would be possible...

Thanks for the explanation.


All the best,
simon




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On Wed, 21 Oct 2020 at 15:39, zimoun <zimon.toutoune@HIDDEN> wrote:

> > IIRC, SBCL itself is built in 2 stages. First its core is compiled
> > using another Common Lisp implementation (currently clisp in Guix), then
> > the complete SBCL is compiled using the core compiled in stage 1. There
> > is probably also an embedded timestamp issue here (coming for clisp,
> > from SBCL, or both) causing the reproducibility issue.

In addition, GCC is also involved in the party.  And I have also
replaced it by Clang with the same effect.

Cheers,
simon




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zimoun <zimon.toutoune@HIDDEN> writes:

> In addition, GCC is also involved in the party.  And I have also
> replaced it by Clang with the same effect.

Where?

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Guillaume Le Vaillant <glv@HIDDEN> writes:

> IIRC, SBCL itself is built in 2 stages. First its core is compiled
> using another Common Lisp implementation (currently clisp in Guix), then
> the complete SBCL is compiled using the core compiled in stage 1.

Yes, this is correct.

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 Content preview:  On Wed, 21 Oct 2020 at 16:32, Pierre Neidhardt wrote: > >
 In addition, GCC is also involved in the party. And I have also > > replaced
 it by Clang with the same effect. > > Where? --8<cut herestart>8---
 (define-module
 (ddc-sbcl) #:use-module (guix packages) #:use-module (guix utils) #:use-module
 ((guix build utils) #:select (modify-pha [...] 
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On Wed, 21 Oct 2020 at 16:32, Pierre Neidhardt <mail@HIDDEN> wrote:

> > In addition, GCC is also involved in the party.  And I have also
> > replaced it by Clang with the same effect.
>
> Where?

--8<---------------cut here---------------start------------->8---
(define-module (ddc-sbcl)
  #:use-module (guix packages)
  #:use-module (guix utils)
  #:use-module ((guix build utils) #:select (modify-phases))
  #:use-module (srfi srfi-1)
  #:use-module (ice-9 match)

  #:use-module (gnu packages lisp)
  #:use-module (gnu packages commencement)
  #:use-module (gnu packages llvm))

(define  (make-sbcl name string-compil compil cc)
  (package
    (inherit sbcl)
    (name name)
    (arguments
     (substitute-keyword-arguments (package-arguments sbcl)
       ((#:phases phases)
        `(modify-phases ,phases
           (replace 'build
             (lambda* (#:key outputs #:allow-other-keys)
             (setenv "CC" ,cc)
             (invoke "sh" "make.sh" ,string-compil
                     (string-append "--prefix="
                                    (assoc-ref outputs "out"))
                     "--dynamic-space-size=2Gb"
                     "--with-sb-core-compression"
                     "--with-sb-xref-for-internals")))))))
    (native-inputs
     `(,@(alist-delete "clisp" (package-native-inputs sbcl))
       ("compil" ,compil)))))


(define-public sbcl-A
  (package-with-c-toolchain
   (make-sbcl "sbcl-A" "clisp" clisp "gcc")
   `(("gcc" ,gcc-toolchain))))      ;fail with 6

(define-public sbcl-B
  (package-with-c-toolchain
   (make-sbcl "sbcl-B" "ecl" ecl "clang")
   `(("clang" ,clang-toolchain))))



(define-public sbcl-AA
  (package-with-c-toolchain
   (make-sbcl "sbcl-AA" "sbcl" sbcl-A "gcc")
   `(("gcc" ,gcc-toolchain))))

(define-public sbcl-BB
  (package-with-c-toolchain
   (make-sbcl "sbcl-BB" "sbcl" sbcl-B "clang")
   `(("clang" ,clang-toolchain))))


(define-public sbcl-CC
  (package-with-c-toolchain
   (make-sbcl "sbcl-CC" "sbcl" sbcl-A "clang")
   `(("clang" ,clang-toolchain))))

(define-public sbcl-DD
  (package-with-c-toolchain
   (make-sbcl "sbcl-DD" "sbcl" sbcl-B "gcc")
   `(("gcc" ,gcc-toolchain))))
--8<---------------cut here---------------end--------------->8---




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--=-=-=
Content-Type: text/plain


zimoun <zimon.toutoune@HIDDEN> skribis:

>> Removing this source file timestamp from compiled files would simplify
>> things. Maybe nothing really depends on it and it would be possible...
>
>Thanks for the explanation.

A developer of SBCL agrees that the timestamp should be removed [1], but
currently Slime has a function depending on it. I asked if this could
be fixed [2]. We'll see...

[1] https://sourceforge.net/p/sbcl/mailman/message/37133640/
[2] https://github.com/slime/slime/issues/583

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 Content preview: Guillaume Le Vaillant <glv@HIDDEN> writes: > A developer
 of SBCL agrees that the timestamp should be removed [1], but > currently
 Slime has a function depending on it. I asked if this could > be fixed [2].
 We'll see... > > [1] https://sourcefo [...] 
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 Content preview:  Guillaume Le Vaillant <glv@HIDDEN> writes: > A developer
    of SBCL agrees that the timestamp should be removed [1], but > currently
   Slime has a function depending on it. I asked if this could > be fixed [2].
    We'll see... > > [1] https://sourcefo [...] 
 
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--=-=-=
Content-Type: text/plain
Content-Transfer-Encoding: quoted-printable

Guillaume Le Vaillant <glv@HIDDEN> writes:

> A developer of SBCL agrees that the timestamp should be removed [1], but
> currently Slime has a function depending on it. I asked if this could
> be fixed [2]. We'll see...
>
> [1] https://sourceforge.net/p/sbcl/mailman/message/37133640/
> [2] https://github.com/slime/slime/issues/583

Thank you so much for asking!

=2D-=20
Pierre Neidhardt
https://ambrevar.xyz/

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Hi Guillaume,

Thank you for asking upstream.


On Wed, 21 Oct 2020 at 18:45, Guillaume Le Vaillant <glv@HIDDEN> wrote:

> A developer of SBCL agrees that the timestamp should be removed [1], but
> currently Slime has a function depending on it. I asked if this could
> be fixed [2]. We'll see...
>
> [1] https://sourceforge.net/p/sbcl/mailman/message/37133640/

Ouch!  Hard to read when not subscribed. :-)

> [2] https://github.com/slime/slime/issues/583

If upstream does not want to patch, do you think it is doable to patch
SLIME and maintain the patch with the Guix package?

Thanks,
simon




Message sent to bug-guix@HIDDEN:


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 Content preview: zimoun <zimon.toutoune@HIDDEN> writes: > If upstream does
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 the patch with the Guix package? Accepted or not, we also need to ping the
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 Content preview:  zimoun <zimon.toutoune@HIDDEN> writes: > If upstream does
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--=-=-=
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zimoun <zimon.toutoune@HIDDEN> writes:

> If upstream does not want to patch, do you think it is doable to patch
> SLIME and maintain the patch with the Guix package?

Accepted or not, we also need to ping the SLY maintainer to apply the
same change.  (SLY is a fork of SLIME.)

=2D-=20
Pierre Neidhardt
https://ambrevar.xyz/

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--=-=-=--





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