Provided by: dpkg-dev_1.19.0.5ubuntu2_all bug

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 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.

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 variables.

       -c, --command command-string
              Execute a command-string 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 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)).

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 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/.

VARIABLES

       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).

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.  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/share/dpkg/cputable
              Table  of known CPU names and mapping to their GNU name.  Format version 1.0 (since
              dpkg 1.13.2).

       /usr/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/share/dpkg/tupletable
              Mapping  between  Debian architecture tuples and Debian architecture names.  Format
              version 1.0 (since dpkg 1.18.11).

       /usr/share/dpkg/abitable
              Table of Debian architecture ABI attribute overrides.  Format  version  2.0  (since
              dpkg 1.18.11).

   Packaging support
       /usr/share/dpkg/architecture.mk
              Makefile   snippet   that   properly  sets  and  exports  all  the  variables  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.

ENVIRONMENT

       DPKG_DATADIR
              If set, it will be used as the dpkg data directory, where the  architecture  tables
              are located (since dpkg 1.14.17).  Defaults to «/usr/share/dpkg».

NOTES

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

SEE ALSO

       dpkg-buildpackage(1).