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NAME | SYNOPSIS | DESCRIPTION | COMMANDS | OPTIONS | TERMS | VARIABLES | FILES | EXAMPLES | NOTES | SEE ALSO | COLOPHON |
dpkg-architecture(1) dpkg suite dpkg-architecture(1)
dpkg-architecture - set and determine the architecture for package
building
dpkg-architecture [option...] [command]
dpkg-architecture provides a facility to determine and set the build
and host architecture for package building.
The build architecture is always determined by an external call to
dpkg(1), and cannot be set at the command line.
You can specify the host architecture by providing one or both of the
options --host-arch and --host-type. The default is determined by an
external call to gcc(1), or the same as the build architecture if CC
or gcc are both not available. One out of --host-arch and --host-type
is sufficient, the value of the other will be set to a usable
default. Indeed, it is often better to only specify one, because
dpkg-architecture will warn you if your choice does not match the
default.
-l, --list
Print the environment variables, one each line, in the format
VARIABLE=value. This is the default action.
-e, --equal architecture
Check for equality of architecture (since dpkg 1.13.13). It
compares the current or specified Debian host architecture
against architecture, to check if they are equal. This action
will not expand the architecture wildcards. Command finishes
with an exit status of 0 if matched, 1 if not matched.
-i, --is architecture-wildcard
Check for identity of architecture (since dpkg 1.13.13). It
compares the current or specified Debian host architecture
against architecture-wildcard after having expanded it as an
architecture wildcard, to check if they match. Command
finishes with an exit status of 0 if matched, 1 if not
matched.
-q, --query variable-name
Print the value of a single variable.
-s, --print-set
Print an export command. This can be used to set the
environment variables using eval.
-u, --print-unset
Print a similar command to --print-unset but to unset all
variables.
-c, --command command
Execute a command in an environment which has all variables
set to the determined value.
-L, --list-known
Print a list of valid architecture names. Possibly restricted
by one or more of the matching options --match-wildcard,
--match-bits or --match-endian (since dpkg 1.17.14).
-?, --help
Show the usage message and exit.
--version
Show the version and exit.
-a, --host-arch architecture
Set the host Debian architecture.
-t, --host-type gnu-system-type
Set the host GNU system type.
-A, --target-arch architecture
Set the target Debian architecture (since dpkg 1.17.14).
-T, --target-type gnu-system-type
Set the target GNU system type (since dpkg 1.17.14).
-W, --match-wildcard architecture-wildcard
Restrict the architectures listed by --list-known to ones
matching the specified architecture wildcard (since dpkg
1.17.14).
-B, --match-bits architecture-bits
Restrict the architectures listed by --list-known to ones with
the specified CPU bits (since dpkg 1.17.14). Either 32 or 64.
-E, --match-endian architecture-endianness
Restrict the architectures listed by --list-known to ones with
the specified endianness (since dpkg 1.17.14). Either little
or big.
-f, --force
Values set by existing environment variables with the same
name as used by the scripts are honored (i.e. used by
dpkg-architecture), except if this force flag is present. This
allows the user to override a value even when the call to
dpkg-architecture is buried in some other script (for example
dpkg-buildpackage(1)).
build machine
The machine the package is built on.
host machine
The machine the package is built for.
target machine
The machine the compiler is building for. This is only needed
when building a cross-toolchain, one that will be built on the
build architecture, to be run on the host architecture, and to
build code for the target architecture.
Debian architecture
The Debian architecture string, which specifies the binary tree
in the FTP archive. Examples: i386, sparc, hurd-i386.
Debian architecture tuple
A Debian architecture tuple is the fully qualified architecture
with all its components spelled out. This differs with Debian
architectures in that at least the cpu component does not embed
the abi. The current tuple has the form abi-libc-os-cpu.
Examples: base-gnu-linux-amd64, eabihf-musl-linux-arm.
Debian architecture wildcard
A Debian architecture wildcard is a special architecture string
that will match any real architecture being part of it. The
general form is a Debian architecture tuple with four or less
elements, and with at least one of them being any. Missing
elements of the tuple are prefixed implicitly as any, and thus
the following pairs are equivalent:
any-any-any-any = any
any-any-os-any = os-any
any-libc-any-any = libc-any-any
Examples: linux-any, any-i386, hurd-any, eabi-any-any-arm,
musl-any-any.
GNU system type
An architecture specification string consisting of two parts
separated by a hyphen: cpu and system. Examples: i586-linux-gnu,
sparc-linux-gnu, i686-gnu, x86_64-netbsd.
multiarch triplet
The clarified GNU system type, used for filesystem paths. This
triplet does not change even when the baseline ISA gets bumped,
so that the resulting paths are stable over time. The only
current difference with the GNU system type is that the CPU part
for i386 based systems is always i386. Examples: i386-linux-gnu,
x86_64-linux-gnu. Example paths: /lib/powerpc64le-linux-gnu/,
/usr/lib/i386-kfreebsd-gnu/.
The following variables are set by dpkg-architecture:
DEB_BUILD_ARCH
The Debian architecture of the build machine.
DEB_BUILD_ARCH_ABI
The Debian abi name of the build machine (since dpkg 1.18.11).
DEB_BUILD_ARCH_LIBC
The Debian libc name of the build machine (since dpkg 1.18.11).
DEB_BUILD_ARCH_OS
The Debian system name of the build machine (since dpkg 1.13.2).
DEB_BUILD_ARCH_CPU
The Debian cpu name of the build machine (since dpkg 1.13.2).
DEB_BUILD_ARCH_BITS
The pointer size of the build machine (in bits; since dpkg
1.15.4).
DEB_BUILD_ARCH_ENDIAN
The endianness of the build machine (little / big; since dpkg
1.15.4).
DEB_BUILD_GNU_CPU
The CPU part of DEB_BUILD_GNU_TYPE.
DEB_BUILD_GNU_SYSTEM
The System part of DEB_BUILD_GNU_TYPE.
DEB_BUILD_GNU_TYPE
The GNU system type of the build machine.
DEB_BUILD_MULTIARCH
The clarified GNU system type of the build machine, used for
filesystem paths (since dpkg 1.16.0).
DEB_HOST_ARCH
The Debian architecture of the host machine.
DEB_HOST_ARCH_ABI
The Debian abi name of the host machine (since dpkg 1.18.11).
DEB_HOST_ARCH_LIBC
The Debian libc name of the host machine (since dpkg 1.18.11).
DEB_HOST_ARCH_OS
The Debian system name of the host machine (since dpkg 1.13.2).
DEB_HOST_ARCH_CPU
The Debian cpu name of the host machine (since dpkg 1.13.2).
DEB_HOST_ARCH_BITS
The pointer size of the host machine (in bits; since dpkg
1.15.4).
DEB_HOST_ARCH_ENDIAN
The endianness of the host machine (little / big; since dpkg
1.15.4).
DEB_HOST_GNU_CPU
The CPU part of DEB_HOST_GNU_TYPE.
DEB_HOST_GNU_SYSTEM
The System part of DEB_HOST_GNU_TYPE.
DEB_HOST_GNU_TYPE
The GNU system type of the host machine.
DEB_HOST_MULTIARCH
The clarified GNU system type of the host machine, used for
filesystem paths (since dpkg 1.16.0).
DEB_TARGET_ARCH
The Debian architecture of the target machine (since dpkg
1.17.14).
DEB_TARGET_ARCH_ABI
The Debian abi name of the target machine (since dpkg 1.18.11).
DEB_TARGET_ARCH_LIBC
The Debian libc name of the target machine (since dpkg 1.18.11).
DEB_TARGET_ARCH_OS
The Debian system name of the target machine (since dpkg
1.17.14).
DEB_TARGET_ARCH_CPU
The Debian cpu name of the target machine (since dpkg 1.17.14).
DEB_TARGET_ARCH_BITS
The pointer size of the target machine (in bits; since dpkg
1.17.14).
DEB_TARGET_ARCH_ENDIAN
The endianness of the target machine (little / big; since dpkg
1.17.14).
DEB_TARGET_GNU_CPU
The CPU part of DEB_TARGET_GNU_TYPE (since dpkg 1.17.14).
DEB_TARGET_GNU_SYSTEM
The System part of DEB_TARGET_GNU_TYPE (since dpkg 1.17.14).
DEB_TARGET_GNU_TYPE
The GNU system type of the target machine (since dpkg 1.17.14).
DEB_TARGET_MULTIARCH
The clarified GNU system type of the target machine, used for
filesystem paths (since dpkg 1.17.14).
Architecture tables
All these files have to be present for dpkg-architecture to work.
Their location can be overridden at runtime with the environment
variable DPKG_DATADIR. These tables contain a format Version pseudo-
field on their first line to mark their format, so that parsers can
check if they understand it, such as "# Version=1.0".
/usr/local/share/dpkg/cputable
Table of known CPU names and mapping to their GNU name.
Format version 1.0 (since dpkg 1.13.2).
/usr/local/share/dpkg/ostable
Table of known operating system names and mapping to their GNU
name. Format version 2.0 (since dpkg 1.18.11).
/usr/local/share/dpkg/tupletable
Mapping between Debian architecture tuples and Debian
architecture names. Format version 1.0 (since dpkg 1.18.11).
/usr/local/share/dpkg/abitable
Table of Debian architecture ABI attribute overrides. Format
version 2.0 (since dpkg 1.18.11).
Packaging support
/usr/local/share/dpkg/architecture.mk
Makefile snippet that properly sets and exports all the
variables that dpkg-architecture outputs (since dpkg 1.16.1).
dpkg-buildpackage accepts the -a option and passes it to
dpkg-architecture. Other examples:
CC=i386-gnu-gcc dpkg-architecture -c debian/rules build
eval `dpkg-architecture -u`
Check if the current or specified host architecture is equal to an
architecture:
dpkg-architecture -elinux-alpha
dpkg-architecture -amips -elinux-mips
Check if the current or specified host architecture is a Linux
system:
dpkg-architecture -ilinux-any
dpkg-architecture -ai386 -ilinux-any
Usage in debian/rules
The environment variables set by dpkg-architecture are passed to
debian/rules as make variables (see make documentation). However, you
should not rely on them, as this breaks manual invocation of the
script. Instead, you should always initialize them using
dpkg-architecture with the -q option. Here are some examples, which
also show how you can improve the cross compilation support in your
package:
Retrieving the GNU system type and forwarding it to ./configure:
DEB_BUILD_GNU_TYPE ?= $(shell dpkg-architecture -qDEB_BUILD_GNU_TYPE)
DEB_HOST_GNU_TYPE ?= $(shell dpkg-architecture -qDEB_HOST_GNU_TYPE)
[...]
ifeq ($(DEB_BUILD_GNU_TYPE), $(DEB_HOST_GNU_TYPE))
confflags += --build=$(DEB_HOST_GNU_TYPE)
else
confflags += --build=$(DEB_BUILD_GNU_TYPE) \
--host=$(DEB_HOST_GNU_TYPE)
endif
[...]
./configure $(confflags)
Doing something only for a specific architecture:
DEB_HOST_ARCH ?= $(shell dpkg-architecture -qDEB_HOST_ARCH)
ifeq ($(DEB_HOST_ARCH),alpha)
[...]
endif
or if you only need to check the CPU or OS type, use the
DEB_HOST_ARCH_CPU or DEB_HOST_ARCH_OS variables.
Note that you can also rely on an external Makefile snippet to
properly set all the variables that dpkg-architecture can provide:
include /usr/local/share/dpkg/architecture.mk
ifeq ($(DEB_HOST_ARCH),alpha)
[...]
endif
In any case, you should never use dpkg --print-architecture to get
architecture information during a package build.
All long command and option names available only since dpkg 1.17.17.
dpkg-buildpackage(1), dpkg-cross(1).
This page is part of the dpkg (Debian Package Manager) project.
Information about the project can be found at
⟨https://wiki.debian.org/Teams/Dpkg/⟩. If you have a bug report for
this manual page, see
⟨http://bugs.debian.org/cgi-bin/pkgreport.cgi?src=dpkg⟩. This page
was obtained from the project's upstream Git repository
⟨git://git.debian.org/git/dpkg/dpkg.git⟩ on 2017-07-05. If you dis‐
cover any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page, or
you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a mail
to man-pages@man7.org
1.18.15-3-ga2ef 1970-01-01 dpkg-architecture(1)
Pages that refer to this page: dpkg-buildpackage(1), deb-src-control(5)