dpkg-architecture

dpkg-architecture(1)            dpkg utilities            dpkg-architecture(1)

NAME
       dpkg-architecture  -  set  and  determine  the architecture for package
       building

SYNOPSIS
       dpkg-architecture [option...] [command]

DESCRIPTION
       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 can not 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.

COMMANDS
       -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 vari-
              ables.

       -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.

OPTIONS
       -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 match-
              ing 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)).

TERMS
       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 wildcard
           A Debian architecture wildcard is  a  special  architecture  string
           that will match any real architecture being part of it. The general
           form is <kernel>-<cpu>.  Examples: linux-any, any-i386, hurd-any.

       GNU system type
           An architecture specification string consisting of two parts  sepa-
           rated  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/.

VARIABLES
       The following variables are set by dpkg-architecture:

       DEB_BUILD_ARCH
           The Debian architecture of the build machine.

       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_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_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).

FILES
   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.

       /usr/share/dpkg/cputable
              Table of known CPU names and mapping to their GNU name.

       /usr/share/dpkg/ostable
              Table  of  known operating system names and mapping to their GNU
              name.

       /usr/share/dpkg/triplettable
              Mapping between Debian architecture triplets and  Debian  archi-
              tecture names.

       /usr/share/dpkg/abitable
              Table of Debian architecture ABI attribute overrides.

   Packaging support
       /usr/share/dpkg/architecture.mk
              Makefile  snippet  that  properly sets and exports all the vari-
              ables that dpkg-architecture outputs (since dpkg 1.16.1).

EXAMPLES
       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/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.

NOTES
       All long command and option names available only since dpkg 1.17.17.

SEE ALSO
       dpkg-buildpackage(1), dpkg-cross(1).

Debian Project                    2013-03-28              dpkg-architecture(1)
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