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doc: Document how to enable qemu binfmt service and how to use it.

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* doc/contributing.texi (Submitting Patches): Document how to enable qemu
binfmt service and how to use it.

Co-authored-by: Ricardo Wurmus <rekado@elephly.net>
This commit is contained in:
Danny Milosavljevic 2019-02-03 16:29:00 +01:00
parent 959eaa1eb8
commit 89339a35bd
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doc/contributing.texi
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@ -817,6 +817,33 @@ name of the new or modified package, and fix any errors it reports
Make sure the package builds on your platform, using @code{guix build
@var{package}}.
@item
We recommend you also try building the package on other supported
platforms. As you may not have access to actual hardware platforms, we
recommend using the @code{qemu-binfmt-service-type} to emulate them. In
order to enable it, add the following service to the list of services in
your @code{operating-system} configuration:
@example
(service qemu-binfmt-service-type
(qemu-binfmt-configuration
(platforms (lookup-qemu-platforms "arm" "aarch64" "ppc" "mips64el"))
(guix-support? #t)))
@end example
Then reconfigure your system.
You can then build packages for different platforms by specifying the
@code{--system} option. For example, to build the "hello" package for
the armhf, aarch64, powerpc, or mips64 architectures, you would run the
following commands, respectively:
@example
guix build --system=armhf-linux --rounds=2 hello
guix build --system=aarch64-linux --rounds=2 hello
guix build --system=powerpc-linux --rounds=2 hello
guix build --system=mips64el-linux --rounds=2 hello
@end example
@item
@cindex bundling
Make sure the package does not use bundled copies of software already