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

       dpkg-architecture  -  set  and  determine  the architecture for package

       dpkg-architecture [options] [commands]

       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.

       -l     Print the environment variables, one each line,  in  the  format
              VARIABLE=value. This is the default action.

              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.

              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.

              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.

              Show the version and exit.

              Set the Debian architecture.

              Set the GNU system type.

       -f     Values set by existing environment variables with the same  name
              as  used by the scripts are honored (i.e. used by dpkg-architec-
              ture), 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-buildpack-

       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.

       The following variables are set by dpkg-architecture:

           The Debian architecture of the build machine.

           The Debian system name of the build machine.

           The Debian cpu name of the build machine.

           The GNU system type of the build machine.

           The CPU part of DEB_BUILD_GNU_TYPE

           The System part of DEB_BUILD_GNU_TYPE.

           The Debian architecture of the host machine.

           The Debian system name of the host machine.

           The Debian cpu name of the host machine.

           The GNU system type of the host machine.

           The CPU part of DEB_HOST_GNU_TYPE.

           The System part of DEB_HOST_GNU_TYPE.

       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)

       please use:

              DEB_HOST_ARCH := $(shell dpkg-architecture -qDEB_HOST_ARCH)

              ifeq ($(DEB_HOST_ARCH),alpha)

       or   if   you  only  need  to  check  the  CPU  or  OS  type,  use  the
       DEB_HOST_ARCH_CPU or DEB_HOST_ARCH_OS variables.

       In general, calling dpkg in the rules file to get architecture informa-
       tion  is deprecated (unless you want to provide backward compatibility,
       see below).  Especially the --print-architecture option  is  unreliable
       since we have Debian architectures which don't equal a processor name.

       The  DEB_HOST_ARCH_CPU  and DEB_HOST_ARCH_OS variables were only intro-
       duced in relatively recent versions of  dpkg-architecture  (since  dpkg
       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
              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

       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
                DEB_BUILD_GNU_SYSTEM := linux-gnu

              DEB_HOST_ARCH := $(DEB_BUILD_ARCH)
              DEB_HOST_GNU_CPU := $(DEB_BUILD_GNU_CPU)

       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
       with native compilation).

       The  -e  and  -i options were only introduced in relatively recent ver-
       sions of dpkg-architecture (since dpkg 1.13.13).

       dpkg-buildpackage accepts the -a option and passes it to dpkg-architec-
       ture. Other examples:

              CC=i386-gnu-gcc dpkg-architecture -c debian/rules build

              eval `dpkg-architecture -u`

       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

       All these files have to be present for dpkg-architecture to work. Their
       location can be overriden at  runtime  with  the  environment  variable

              Table of known CPU names and mapping to their GNU name.

              Table  of  known operating system names and mapping to their GNU

              Mapping between Debian architecture triplets and  Debian  archi-
              tecture names.

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

       dpkg-architecture  and  this  man page were initially written by Marcus
       Brinkmann <brinkmdATdebian.org>.

Debian Project                    2007-03-06              dpkg-architecture(1)