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doc: Add a "Platforms" chapter.
* doc/guix.texi ("Platforms"): New chapter. ("Porting"): Link it.
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doc/guix.texi
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doc/guix.texi
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@ -183,6 +183,7 @@ Weblate} (@pxref{Translating Guix}).
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* System Configuration:: Configuring the operating system.
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* Home Configuration:: Configuring the home environment.
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* Documentation:: Browsing software user manuals.
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* Platforms:: Defining platforms.
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* Installing Debugging Files:: Feeding the debugger.
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* Using TeX and LaTeX:: Typesetting.
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* Security Updates:: Deploying security fixes quickly.
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@ -407,6 +408,11 @@ Defining Services
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* Shepherd Services:: A particular type of service.
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* Complex Configurations:: Defining bindings for complex configurations.
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Platforms
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* platform Reference:: Detail of platform declarations.
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* Supported Platforms:: Description of the supported platforms.
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Installing Debugging Files
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* Separate Debug Info:: Installing 'debug' outputs.
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@ -41288,6 +41294,115 @@ reader,, info-stnd, Stand-alone GNU Info}) and its Emacs counterpart
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bindings to navigate manuals. @xref{Getting Started,,, info, Info: An
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Introduction}, for an introduction to Info navigation.
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@node Platforms
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@chapter Platforms
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The packages and systems built by Guix are intended, like most computer
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programs, to run on a CPU with a specific instruction set, and under a
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specific operating system. Those programs are often also targeting a
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specific kernel and system library. Those constraints are captured by
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Guix in @code{platform} records.
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@menu
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* platform Reference:: Detail of platform declarations.
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* Supported Platforms:: Description of the supported platforms.
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@end menu
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@node platform Reference
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@section @code{platform} Reference
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The @code{platform} data type describes a @dfn{platform}: an
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@acronym{ISA, instruction set architecture}, combined with an operating
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system and possibly additional system-wide settings such as the
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@acronym{ABI, application binary interface}.
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@deftp {Data Type} platform
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This is the data type representing a platform.
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@table @asis
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@item @code{target}
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This field specifies the platform's GNU triplet as a string
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(@pxref{Specifying Target Triplets, GNU configuration triplets,,
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autoconf, Autoconf}).
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@item @code{system}
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This string is the system type as it is known to Guix and passed,
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for instance, to the @option{--system} option of most commands.
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It usually has the form @code{"@var{cpu}-@var{kernel}"}, where
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@var{cpu} is the target CPU and @var{kernel} the target operating
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system kernel.
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It can be for instance @code{"aarch64-linux"} or @code{"armhf-linux"}.
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You will encounter system types when you perform native builds
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(@pxref{Native Builds}).
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@item @code{linux-architecture} (default: @code{#false})
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This optional string field is only relevant if the kernel is Linux. In
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that case, it corresponds to the ARCH variable used when building Linux,
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@code{"mips"} for instance.
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@item @code{glibc-dynamic-linker}
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This field is the name of the GNU C Library dynamic linker for the
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corresponding system, as a string. It can be
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@code{"/lib/ld-linux-armhf.so.3"}.
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@end table
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@end deftp
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@node Supported Platforms
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@section Supported Platforms
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The @code{(guix platforms @dots{})} modules export the following
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variables, each of which is bound to a @code{platform} record.
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@defvr {Scheme Variable} armv7-linux
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Platform targeting ARM v7 CPU running GNU/Linux.
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@end defvr
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@defvr {Scheme Variable} aarch64-linux
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Platform targeting ARM v8 CPU running GNU/Linux.
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@end defvr
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@defvr {Scheme Variable} mips64-linux
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Platform targeting MIPS little-endian 64-bit CPU running GNU/Linux.
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@end defvr
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@defvr {Scheme Variable} powerpc-linux
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Platform targeting PowerPC big-endian 32-bit CPU running GNU/Linux.
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@end defvr
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@defvr {Scheme Variable} powerpc64le-linux
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Platform targeting PowerPC little-endian 64-bit CPU running GNU/Linux.
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@end defvr
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@defvr {Scheme Variable} riscv64-linux
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Platform targeting RISC-V 64-bit CPU running GNU/Linux.
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@end defvr
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@defvr {Scheme Variable} i686-linux
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Platform targeting x86 CPU running GNU/Linux.
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@end defvr
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@defvr {Scheme Variable} x86_64-linux
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Platform targeting x86 64-bit CPU running GNU/Linux.
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@end defvr
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@defvr {Scheme Variable} i686-mingw
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Platform targeting x86 CPU running Windows, with run-time support from
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MinGW.
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@end defvr
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@defvr {Scheme Variable} x86_64-mingw
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Platform targeting x86 64-bit CPU running Windows, with run-time support
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from MinGW.
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@end defvr
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@defvr {Scheme Variable} i586-gnu
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Platform targeting x86 CPU running GNU/Hurd (also referred to as
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``GNU'').
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@end defvr
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@node Installing Debugging Files
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@chapter Installing Debugging Files
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@ -42027,7 +42142,7 @@ connection between a GNU triplet (@pxref{Specifying Target Triplets, GNU
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configuration triplets,, autoconf, Autoconf}), the equivalent
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@var{system} in Nix notation, the name of the
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@var{glibc-dynamic-linker}, and the corresponding Linux architecture
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name if applicable.
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name if applicable (@pxref{Platforms}).
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Once the bootstrap tarball are built, the @code{(gnu packages
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bootstrap)} module needs to be updated to refer to these binaries on the
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