dpkg-architecture

       building

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

DESCRIPTION
       dpkg-architecture does provide 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  -a  and  -t.  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 -a and -t 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     Print the environment variables, one each line,  in  the  format
              VARIABLE=value. This is the default action.

       -edebian-architecture
              Check  for equality of architecture. By default debian-architec-
              ture is compared against the current Debian architecture,  being
              the  host.   This  action will not expand the architecture wild-
              cards. Command finishes with an exit status of 0 if  matched,  1
              if not matched.

       -iarchitecture-wildcard
              Check  for  identity  of architecture by expanding architecture-
              wildcard as an architecture wildcard and comparing  against  the
              current  Debian architecture. Command finishes with an exit sta-
              tus of 0 if matched, 1 if not matched.

       -qvariable-name
              Print the value of a single variable.

       -s     Print an export command. This can be used to set the environment
              variables using eval.

       -u     Print a similar command to -s but to unset all variables.

       -c command
              Execute  a command in an environment which has all variables set
              to the determined value.

       -L     Print a list of valid architecture names.

       --help Show the usage message and exit.

       --version
              user to override a value even when the call to dpkg-architecture
              is buried in some  other  script  (for  example  dpkg-buildpack-
              age(1)).

TERMS
       build machine
           The machine the package is built on.

       host machine
           The machine the package is built for.

       Debian architecture
           The  Debian architecture string, which specifies the binary tree in
           the FTP archive. Examples: i386, sparc, hurd-i386.

       architecture wildcard
           An 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  dash:  cpu  and  system.  Examples:  i386-linux-gnu,
           sparc-linux-gnu, i386-gnu, x86_64-netbsd.

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.

       DEB_BUILD_ARCH_CPU
           The Debian cpu name of the build machine.

       DEB_BUILD_ARCH_BITS
           The pointer size of the build machine (in bits).

       DEB_BUILD_ARCH_ENDIAN
           The endianness of the build machine (little / big).

       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
           The pointer size of the host machine (in bits).

       DEB_HOST_ARCH_ENDIAN
           The endianness of the host machine (little / big).

       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.

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-architec-
       ture with the -q option. Here are some examples, which  also  show  how
       you can improve the cross compilation support in your package:

       Instead of:

              ARCH=`dpkg --print-architecture`
              configure $(ARCH)-linux

       please use the following:

              DEB_BUILD_GNU_TYPE := $(shell dpkg-architecture -qDEB_BUILD_GNU_TYPE)
              DEB_HOST_GNU_TYPE := $(shell dpkg-architecture -qDEB_HOST_GNU_TYPE)

              configure --build=$(DEB_BUILD_GNU_TYPE) --host=$(DEB_HOST_GNU_TYPE)

       Instead of:

              ARCH=`dpkg --print-architecture`
              ifeq ($(ARCH),alpha)
                ...
              endif

       please use:

              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
       The DEB_HOST_ARCH_CPU and DEB_HOST_ARCH_OS variables were introduced in
       dpkg-dev 1.13.2. Before this debian/rules files  tended  to  check  the
       values  of  the  DEB_HOST_GNU_CPU  or DEB_HOST_GNU_TYPE variables which
       have been subject to change.

       Where debian/rules files check these variables to decide how or what to
       compile,  this  should  be updated to use the new variables and values.
       You may wish to retain backwards compatibility with  older  version  of
       dpkg-dev by using the following code:

              DEB_HOST_ARCH_CPU := $(shell dpkg-architecture -qDEB_HOST_ARCH_CPU 2>/dev/null)
              DEB_HOST_ARCH_OS := $(shell dpkg-architecture -qDEB_HOST_ARCH_OS 2>/dev/null)

              # Take account of old dpkg-architecture output.
              ifeq ($(DEB_HOST_ARCH_CPU),)
                DEB_HOST_ARCH_CPU := $(shell dpkg-architecture -qDEB_HOST_GNU_CPU)
                ifeq ($(DEB_HOST_ARCH_CPU),x86_64)
                  DEB_HOST_ARCH_CPU := amd64
                endif
              endif
              ifeq ($(DEB_HOST_ARCH_OS),)
                DEB_HOST_ARCH_OS := $(subst -gnu,,$(shell dpkg-architecture -qDEB_HOST_GNU_SYSTEM))
                ifeq ($(DEB_HOST_ARCH_OS),gnu)
                  DEB_HOST_ARCH_OS := hurd
                endif
              endif

       And similarly for DEB_BUILD_ARCH_CPU and DEB_BUILD_ARCH_OS.

       If  you still wish to support versions of dpkg-dev that did not include
       dpkg-architecture, the following does the job:

              DEB_BUILD_ARCH := $(shell dpkg --print-architecture)
              DEB_BUILD_GNU_CPU := $(patsubst hurd-%,%,$(DEB_BUILD_ARCH))
              ifeq ($(filter-out hurd-%,$(DEB_BUILD_ARCH)),)
                DEB_BUILD_GNU_SYSTEM := gnu
              else
                DEB_BUILD_GNU_SYSTEM := linux-gnu
              endif
              DEB_BUILD_GNU_TYPE=$(DEB_BUILD_GNU_CPU)-$(DEB_BUILD_GNU_SYSTEM)

              DEB_HOST_ARCH := $(DEB_BUILD_ARCH)
              DEB_HOST_GNU_CPU := $(DEB_BUILD_GNU_CPU)
              DEB_HOST_GNU_SYSTEM := $(DEB_BUILD_GNU_SYSTEM)
              DEB_HOST_GNU_TYPE := $(DEB_BUILD_GNU_TYPE)

       Put a subset of these lines at the top of your debian/rules file; these
       default values will be overwritten if dpkg-architecture is used.

       You don't need the full set. Choose a consistent set which contains the
       values you use in the rules file. For example, if  you  only  need  the
       host  Debian  architecture, `DEB_HOST_ARCH=`dpkg --print-architecture`'
       is sufficient (this is indeed the  Debian  architecture  of  the  build
       machine, but remember that we are only trying to be backward compatible

       Check if an architecture is equal to  the  current  architecture  or  a
       given one:

              dpkg-architecture -elinux-alpha

              dpkg-architecture -amips -elinux-mips

       Check  if  the current architecture or an architecture provided with -a
       are Linux systems:

              dpkg-architecture -ilinux-any

              dpkg-architecture -ai386 -ilinux-any

FILES
       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.

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

AUTHOR
       dpkg-architecture and this man page were initially  written  by  Marcus
       Brinkmann <brinkmd@debian.org>.




Debian Project                    2011-08-14              dpkg-architecture(1)
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