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authorDanny Milosavljevic <dannym@scratchpost.org>2019-02-03 16:29:00 +0100
committerDanny Milosavljevic <dannym@scratchpost.org>2019-02-04 17:56:28 +0100
commit89339a35bd8610ec585da36f3da6ddf116c3fe89 (patch)
treed5a1eaab6fedeab0dac4dabfb81c1ccb9a35bf12 /doc/contributing.texi
parent959eaa1eb834fd47ceab3c5bbbe4967e808d530b (diff)
downloadguix-89339a35bd8610ec585da36f3da6ddf116c3fe89.tar
guix-89339a35bd8610ec585da36f3da6ddf116c3fe89.tar.gz
doc: Document how to enable qemu binfmt service and how to use it.
* 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>
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diff --git a/doc/contributing.texi b/doc/contributing.texi
index d579a39c5d..9459c481a7 100644
--- a/doc/contributing.texi
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@@ -818,6 +818,33 @@ 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
available as separate packages.