dpkg-architecture man page on Darwin

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DPKG-ARCHITECTURE(1)  User Contributed Perl Documentation DPKG-ARCHITECTURE(1)

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

SYNOPSIS
       dpkg-architecture [options] [action]

       Valid options: -aDebian-Architecture -tGnu-System-Type -f

       Valid actions: -l, -qVariable-Name, -s, -u, -c Command

DESCRIPTION
       dpkg-architecture does provide a facility to determine and set the
       build and host architecture for package building.

OVERVIEW
       The build architecture is always determined by an external call to
       dpkg, 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, 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
       doesn't match the default.

       The default action is -l, which prints the environment variales, one
       each line, in the format VARIABLE=value. If you are only interested in
       the value of a single variable, you can use -q. If you specify -s, it
       will output an export command. This can be used to set the environment
       variables using eval. -u does return a similar command to unset all
       variables. -c does execute a command in an environment which has all
       variables set to the determined value.

       Existing environment variables with the same name as used by the
       scripts are not overwritten, except if the -f 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).

TERMS
       build machine
	   The machine the package is built on.

       host machine
	   The machine the package is built for.

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

       GNU System Type
	   An architecture specification string consisting of two or three
	   parts, cpu-system or cpu-vendor-system. Examples: i386-linux,
	   sparc-linux, i386-gnu.

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"`

VARIABLES
       The following variables are set by dpkg-architecture:

       DEB_BUILD_ARCH
	   The Debian architecture of the build machine.

       DEB_BUILD_GNU_TYPE
	   The GNU system type of the build machine.

       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_HOST_ARCH
	   The Debian architecture of the host machine.

       DEB_HOST_GNU_TYPE
	   The GNU system type of the host machine.

       DEB_HOST_GNU_CPU
	   The CPU part of DEB_HOST_GNU_TYPE

       DEB_HOST_GNU_SYSTEM
	   The System part of DEB_HOST_GNU_TYPE

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:

       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

       In general, calling dpkg in the rules file to get architecture
       information is deprecated (until 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.

BACKWARD COMPATIBILITY
       When providing a new facility, it is always a good idea to stay
       compatible with old versions of the programs.  Note that dpkg-
       architecture does not affect old debian/rules files, so the only thing
       to consider is using old versions of dpkg-dev with new debian/rules
       files.  The following does the job:

       DEB_BUILD_ARCH := $(shell dpkg --print-installation-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 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-installation-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).

SEE ALSO
       dpkg-buildpackage dpkg-cross

CONTACT
       If you have questions about the usage of the make variables in your
       rules files, or about cross compilation support in your packages,
       please email me.	 The address is Marcus Brinkmann <brinkmd@debian.org>.

perl v5.16.2			  2004-03-08		  DPKG-ARCHITECTURE(1)
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