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Re: Cross-building GuixSD (and maybe using pre-built toolchains)
From: |
Ludovic Courtès |
Subject: |
Re: Cross-building GuixSD (and maybe using pre-built toolchains) |
Date: |
Thu, 01 Sep 2016 21:43:38 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) |
Paul Boddie <address@hidden> skribis:
> When you write "cross-compile from x86_64" do you mean run a cross-compiler
> on
> an x86_64 host that targets another architecture? (I'm guessing "yes".)
Yes.
> From previous questions, it appears that any compiler must have been built
> specifically for Guix to use (and cannot be those those pre-built toolchains
> provided by, say, Debian), so would these cross-compilers be the ones
> normally
> used to generate the "bootstrap binaries" (that would normally be used to
> then
> build packages on the target system)?
Yes, Guix packages only depend on other Guix packages; there cannot be
dependencies on external packages.
> Or do I first bootstrap Guix on my (x86_64, in this example) "build system",
> then generate special cross-compilers for my target architecture (that are
> then exposed via offloading)?
Offloading and cross-compilation are unrelated. Offloading is just a
mechanism that allows distributed builds.
Guix supports x86_64-linux-gnu, so, IOW, the distro is already
“bootstrapped” for that platform. There’s nothing special to be done.
I’m trying to find ways to rephrase this, but I can’t think of other
ways than what the “Bootstrapping” and “Porting” sections of the manuals
say. :-)
> And can I provide a foreign architecture build daemon on the same machine as
> the one performing the build?
No.
> Sorry if this is all obvious or if I'm not assuming that what is possible is
> actually possible! I'm used to discovering limitations with build systems.
> (To
> me it is remarkable that given all the portable things like shell scripts
> that
> do a lot of the lifting in build processes, many build systems have an
> unreasonable affinity to the build host's architecture.)
>
> Thanks for all the help!
No problem! I realize it can be difficult to convey the big picture of
Guix here to someone already familiar with other build systems.
Ludo’.