From: zimoun <zimon.toutoune@gmail.com>
To: kiasoc5@tutanota.com
Cc: Guix Devel <guix-devel@gnu.org>
Subject: Re: Hardened toolchain
Date: Sun, 27 Mar 2022 22:06:33 +0200 [thread overview]
Message-ID: <86k0cftb1y.fsf@gmail.com> (raw)
In-Reply-To: <Mz6i-jN--3-2@tutanota.com>
Hi,
On Sat, 26 Mar 2022 at 20:33, kiasoc5@tutanota.com wrote:
> Just so I understand, in other (imperative) words:
>
> gcc-hardened-1 = gcc-hardened built with regular gcc
> gcc-hardened-2 = gcc-hardened built with gcc-hardened-1
> n = 1
> while checksum(gcc-hardened-{n}) != checksum(gcc-hardened-{n+1}):
> gcc-hardened-{n+1} = gcc-hardened built with gcc-hardened-{n}
> n++
> define the new toolchain with gcc-hardened-{n+1}
To be totally correct:
binary gcc-hardened-1 = source gcc-hardened built with binary gcc
binary gcc-hardened-2 = source gcc-hardened built with binary gcc-hardened-1
where ’binary gcc’ is the binary seed of the bootstrap.
>> Guix is not auto-magically resolving the fixed-point, i.e., it does not
>> unroll the cycle by magic. :-) You have to do it manually or write code
>> for automatise the process; described above.
>>
> Thanks, are there any examples in the code base that would be a good
> reference?
(gnu packages commencement), I guess.
On Sat, 26 Mar 2022 at 23:02, kiasoc5@tutanota.com wrote:
> Here's a smaller example that has the same error:
>
> ===the file===
> (use-modules (gnu)
> (guix)
> (guix packages))
>
> (use-package-modules gcc base commencement)
>
> (package-with-c-toolchain gcc `(("toolchain" ,(make-gcc-toolchain gcc))))
> ===the file===
[...]
> The gcc package already exists! Why can't I build gcc with itself?
Well, the symbol ’gcc’ can refer to 3 things:
- source
- recipe for building the source
- binary
Maybe I misunderstand you, but it appears to me that you want:
binary1 = recipe built with binary0
but because ’package-with-c-toolchain’ is recursive, it reads, instead:
binary0 = recipe built with binary0
so, it is a cycle. You cannot build binary0 using this very same
binary0.
Therefore, you have to tweak and manually write the chain, i.e., unroll
the cycle. For example, gcc-hardened-boot build with gcc (seed), then
gcc-hardened built with gcc-hardened-boot. Once you have this binary
gcc-hardened, you can use it with package-with-c-toolchain; however, not
for rebuilding gcc-hardened-boot or gcc-hardened, otherwise you are
introducing a cycle.
Hope that helps.
Cheers,
simon
next prev parent reply other threads:[~2022-03-27 20:15 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-21 13:34 Hardened toolchain zimoun
[not found] ` <Mymdzxm--3-2@tutanota.com>
2022-03-22 19:06 ` zimoun
2022-03-22 20:02 ` kiasoc5--- via Development of GNU Guix and the GNU System distribution.
2022-03-25 19:39 ` kiasoc5--- via Development of GNU Guix and the GNU System distribution.
2022-03-25 22:54 ` zimoun
2022-03-26 19:33 ` kiasoc5--- via Development of GNU Guix and the GNU System distribution.
2022-03-26 22:02 ` kiasoc5--- via Development of GNU Guix and the GNU System distribution.
2022-03-27 20:06 ` zimoun [this message]
2022-03-27 20:22 ` Maxime Devos
2022-03-28 3:17 ` Maxim Cournoyer
2022-03-28 7:35 ` zimoun
2022-03-29 0:02 ` kiasoc5--- via Development of GNU Guix and the GNU System distribution.
2022-03-29 10:15 ` Ludovic Courtès
2022-04-14 18:59 ` kiasoc5--- via Development of GNU Guix and the GNU System distribution.
2022-04-15 15:18 ` jbranso
2022-04-15 16:04 ` Zhu Zihao
2022-04-15 16:34 ` raingloom
2022-04-26 11:07 ` Katherine Cox-Buday
2022-04-28 17:36 ` Aurora
2022-04-28 17:41 ` Katherine Cox-Buday
2022-04-28 19:53 ` Aurora
2022-04-28 17:50 ` Vagrant Cascadian
2022-04-28 19:54 ` Aurora
2022-04-29 10:31 ` zimoun
2022-04-29 15:51 ` kiasoc5--- via Development of GNU Guix and the GNU System distribution.
2022-05-02 14:55 ` Katherine Cox-Buday
2022-05-02 16:25 ` Maxime Devos
2022-05-02 17:41 ` zimoun
2022-05-02 21:10 ` Maxime Devos
-- strict thread matches above, loose matches on Subject: below --
2022-04-15 20:36 Nathan Dehnel
2022-04-16 3:51 ` raingloom
2022-03-21 4:31 kiasoc5--- via Development of GNU Guix and the GNU System distribution.
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