eclass/haskell-cabal.eclass - mirrors/cros/chromiumos/overlays/portage-stable - Git at Google

 # Copyright 1999-2006 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 # $Header: /var/cvsroot/gentoo-x86/eclass/haskell-cabal.eclass,v 1.18 2010/01/26 20:50:40 kolmodin Exp $
 #
 # Original authors: Andres Loeh <kosmikus@gentoo.org>
 #                   Duncan Coutts <dcoutts@gentoo.org>
 # Maintained by: Haskell herd <haskell@gentoo.org>
 #
 # This eclass is for packages that make use of the
 # Haskell Common Architecture for Building Applications
 # and Libraries (cabal).
 #
 # Basic instructions:
 #
 # Before inheriting the eclass, set CABAL_FEATURES to
 # reflect the tools and features that the package makes
 # use of.
 #
 # Currently supported features:
 #   haddock    --  for documentation generation
 #   alex       --  lexer/scanner generator
 #   happy      --  parser generator
 #   c2hs       --  C interface generator
 #   cpphs      --  C preprocessor clone written in Haskell
 #   profile    --  if package supports to build profiling-enabled libraries
 #   bootstrap  --  only used for the cabal package itself
 #   bin        --  the package installs binaries
 #   lib        --  the package installs libraries
 #   nocabaldep --  don't add dependency on cabal.
 #					only used for packages that _must_ not pull the dependency
 #					on cabal, but still use this eclass (e.g. haskell-updater).
 #
 # Dependencies on other cabal packages have to be specified
 # correctly.
 #
 # Cabal libraries should usually be SLOTted with "${PV}".
 #
 # Many Cabal packages require S to be manually set.
 #
 # Conforming Cabal packages don't require any function definitions
 # in the ebuild.
 #
 # Special flags to Cabal Configure can now be set by using
 # CABAL_CONFIGURE_FLAGS

 inherit ghc-package multilib


 for feature in ${CABAL_FEATURES}; do
 	case ${feature} in
 		haddock)    CABAL_USE_HADDOCK=yes;;
 		alex)       CABAL_USE_ALEX=yes;;
 		happy)      CABAL_USE_HAPPY=yes;;
 		c2hs)       CABAL_USE_C2HS=yes;;
 		cpphs)      CABAL_USE_CPPHS=yes;;
 		profile)    CABAL_USE_PROFILE=yes;;
 		bootstrap)  CABAL_BOOTSTRAP=yes;;
 		bin)        CABAL_HAS_BINARIES=yes;;
 		lib)        CABAL_HAS_LIBRARIES=yes;;
 		nocabaldep) CABAL_FROM_GHC=yes;;
 		*) CABAL_UNKNOWN="${CABAL_UNKNOWN} ${feature}";;
 	esac
 done

 if [[ -n "${CABAL_USE_HADDOCK}" ]]; then
 	IUSE="${IUSE} doc"
 	DEPEND="${DEPEND} doc? ( dev-haskell/haddock )"
 fi

 if [[ -n "${CABAL_USE_ALEX}" ]]; then
 	DEPEND="${DEPEND} dev-haskell/alex"
 	cabalconf="${cabalconf} --with-alex=/usr/bin/alex"
 fi

 if [[ -n "${CABAL_USE_HAPPY}" ]]; then
 	DEPEND="${DEPEND} dev-haskell/happy"
 	cabalconf="${cabalconf} --with-happy=/usr/bin/happy"
 fi

 if [[ -n "${CABAL_USE_C2HS}" ]]; then
 	DEPEND="${DEPEND} dev-haskell/c2hs"
 	cabalconf="${cabalconf} --with-c2hs=/usr/bin/c2hs"
 fi

 if [[ -n "${CABAL_USE_CPPHS}" ]]; then
 	DEPEND="${DEPEND} dev-haskell/cpphs"
 	cabalconf="${cabalconf} --with-cpphs=/usr/bin/cpphs"
 fi

 if [[ -n "${CABAL_USE_PROFILE}" ]]; then
 	IUSE="${IUSE} profile"
 fi

 # We always use a standalone version of Cabal, rather than the one that comes
 # with GHC. But of course we can't depend on cabal when building cabal itself.
 if [[ -z ${CABAL_MIN_VERSION} ]]; then
 	CABAL_MIN_VERSION=1.1.4
 fi
 if [[ -z "${CABAL_BOOTSTRAP}" && -z "${CABAL_FROM_GHC}" ]]; then
 	DEPEND="${DEPEND} >=dev-haskell/cabal-${CABAL_MIN_VERSION}"
 fi

 # Libraries require GHC to be installed.
 if [[ -n "${CABAL_HAS_LIBRARIES}" ]]; then
 	RDEPEND="${RDEPEND} dev-lang/ghc"
 fi

 # returns the version of cabal currently in use
 _CABAL_VERSION_CACHE=""
 cabal-version() {
 	if [[ -z "${_CABAL_VERSION_CACHE}" ]]; then
 		if [[ "${CABAL_BOOTSTRAP}" ]]; then
 			# We're bootstrapping cabal, so the cabal version is the version
 			# of this package itself.
 			_CABAL_VERSION_CACHE="${PV}"
 		elif [[ "${CABAL_FROM_GHC}" ]]; then
 			# We can't assume there's a version of Cabal installed by ebuild as
 			# this might be a first time install of GHC (for packages that
 			# use the shipped Cabal like haskell-updater).

 			# The user is likely to only have one version of Cabal, provided
 			# by GHC. Note that dev-haskell/cabal can be a dummy package, only
 			# using the version provided by GHC. If the user has another version
 			# of Cabal too (more recent than the one GHC provides through
 			# dev-haskell/cabal, or possibly older if he used an old
 			# Cabal package) the most recent is used (expected to be the last
 			# one in the ghc-pkg output).
 			_CABAL_VERSION_CACHE="$(ghc-pkg field Cabal version | tail -n 1)"

 			# Strip out the "version: " prefix
 			_CABAL_VERSION_CACHE="${_CABAL_VERSION_CACHE#"version: "}"
 		else
 			# We ask portage, not ghc, so that we only pick up
 			# portage-installed cabal versions.
 			_CABAL_VERSION_CACHE="$(ghc-extractportageversion dev-haskell/cabal)"
 		fi
 	fi
 	echo "${_CABAL_VERSION_CACHE}"
 }

 cabal-bootstrap() {
 	local setupmodule
 	local cabalpackage
 	if [[ -f "${S}/Setup.lhs" ]]; then
 		setupmodule="${S}/Setup.lhs"
 	else
 		if [[ -f "${S}/Setup.hs" ]]; then
 			setupmodule="${S}/Setup.hs"
 		else
 			die "No Setup.lhs or Setup.hs found"
 		fi
 	fi

 	# We build the setup program using the latest version of
 	# cabal that we have installed
 	if version_is_at_least "6.4" "$(ghc-version)"; then
 		cabalpackage=Cabal-$(cabal-version)
 	else
 		# older ghc's don't support package versioning
 		cabalpackage=Cabal
 	fi
 	einfo "Using cabal-$(cabal-version)."
 	$(ghc-getghc) -package "${cabalpackage}" --make "${setupmodule}" -o setup \
 		|| die "compiling ${setupmodule} failed"
 }

 cabal-mksetup() {
 	local setupdir

 	if [[ -n $1 ]]; then
 		setupdir=$1
 	else
 		setupdir=${S}
 	fi

 	rm -f "${setupdir}"/Setup.{lhs,hs}

 	echo 'import Distribution.Simple; main = defaultMainWithHooks defaultUserHooks' \
 		> $setupdir/Setup.hs
 }

 cabal-haddock() {
 	./setup haddock || die "setup haddock failed"
 }

 cabal-configure() {
 	if [[ -n "${CABAL_USE_HADDOCK}" ]] && use doc; then
 		cabalconf="${cabalconf} --with-haddock=/usr/bin/haddock"
 	fi
 	if [[ -n "${CABAL_USE_PROFILE}" ]] && use profile; then
 		cabalconf="${cabalconf} --enable-library-profiling"
 	fi
 	# Building GHCi libs on ppc64 causes "TOC overflow".
 	if use ppc64; then
 		cabalconf="${cabalconf} --disable-library-for-ghci"
 	fi

 	if version_is_at_least "1.4" "$(cabal-version)"; then
 		# disable executable stripping for the executables, as portage will
 		# strip by itself, and pre-stripping gives a QA warning.
 		# cabal versions previous to 1.4 does not strip executables, and does
 		# not accept the flag.
 		# this fixes numerous bugs, amongst them;
 		# bug #251881, bug #251882, bug #251884, bug #251886, bug #299494
 		cabalconf="${cabalconf} --disable-executable-stripping"
 	fi

 	if version_is_at_least "1.2.0" "$(cabal-version)"; then
 		cabalconf="${cabalconf} --docdir=/usr/share/doc/${PF}"
 		# As of Cabal 1.2, configure is quite quiet. For diagnostic purposes
 		# it's better if the configure chatter is in the build logs:
 		cabalconf="${cabalconf} --verbose"
 	fi
 	# Note: with Cabal-1.1.6.x we do not have enough control
 	# to put the docs into the right place. They're currently going
 	# into			/usr/share/${P}/ghc-x.y/doc/
 	# rather than	/usr/share/doc/${PF}/
 	# Because we can only set the datadir, not the docdir.

 	./setup configure \
 		--ghc --prefix=/usr \
 		--with-compiler="$(ghc-getghc)" \
 		--with-hc-pkg="$(ghc-getghcpkg)" \
 		--prefix=/usr \
 		--libdir=/usr/$(get_libdir) \
 		--libsubdir=${P}/ghc-$(ghc-version) \
 		--datadir=/usr/share/ \
 		--datasubdir=${P}/ghc-$(ghc-version) \
 		${cabalconf} \
 		${CABAL_CONFIGURE_FLAGS} \
 		"$@" || die "setup configure failed"
 }

 cabal-build() {
 	unset LANG LC_ALL LC_MESSAGES
 	./setup build \
 		|| die "setup build failed"
 }

 cabal-copy() {
 	./setup copy \
 		--destdir="${D}" \
 		|| die "setup copy failed"

 	# cabal is a bit eager about creating dirs,
 	# so remove them if they are empty
 	rmdir "${D}/usr/bin" 2> /dev/null

 	# GHC 6.4 has a bug in get/setPermission and Cabal 1.1.1 has
 	# no workaround.
 	# set the +x permission on executables
 	if [[ -d "${D}/usr/bin" ]] ; then
 		chmod +x "${D}/usr/bin/"*
 	fi
 	# TODO: do we still need this?
 }

 cabal-pkg() {
 	# This does not actually register since we're using true instead
 	# of ghc-pkg. So it just leaves the .installed-pkg-config and we can
 	# register that ourselves (if it exists).
 	local result
 	local err

 	if [[ -n ${CABAL_HAS_LIBRARIES} ]]; then
 		if version_is_at_least "1.2.0" "$(cabal-version)"; then
 			# Newer cabal can generate a package conf for us:
 			./setup register --gen-pkg-config="${T}/${P}.conf"
 			ghc-setup-pkg "${T}/${P}.conf"
 			ghc-install-pkg
 		else
 			# With older cabal we have to hack it by replacing its ghc-pkg
 			# with true and then just picking up the .installed-pkg-config
 			# file and registering that ourselves (if it exists).
 			sed -i "s|$(ghc-getghcpkg)|$(type -P true)|" .setup-config
 			./setup register || die "setup register failed"
 			if [[ -f .installed-pkg-config ]]; then
 				ghc-setup-pkg .installed-pkg-config
 				ghc-install-pkg
 			else
 				die "setup register has not generated a package configuration file"
 			fi
 		fi
 	fi
 }

 # Some cabal libs are bundled along with some versions of ghc
 # eg filepath-1.0 comes with ghc-6.6.1
 # by putting CABAL_CORE_LIB_GHC_PV="6.6.1" in an ebuild we are declaring that
 # when building with this version of ghc, the ebuild is a dummy that is it will
 # install no files since the package is already included with ghc.
 # However portage still records the dependency and we can upgrade the package
 # to a later one that's not included with ghc.
 # You can also put a space separated list, eg CABAL_CORE_LIB_GHC_PV="6.6 6.6.1".
 cabal-is-dummy-lib() {
 	for version in ${CABAL_CORE_LIB_GHC_PV[*]}; do
 		[[ "$(ghc-version)" == "$version" ]] && return 0
 	done
 	return 1
 }

 # exported function: check if cabal is correctly installed for
 # the currently active ghc (we cannot guarantee this with portage)
 haskell-cabal_pkg_setup() {
 	ghc-package_pkg_setup
 	if [[ -z "${CABAL_BOOTSTRAP}" && -z "${CABAL_FROM_GHC}" ]] && ! ghc-sanecabal "${CABAL_MIN_VERSION}"; then
 		eerror "The package dev-haskell/cabal is not correctly installed for"
 		eerror "the currently active version of ghc ($(ghc-version)). Please"
 		eerror "run ghc-updater or haskell-updater or re-build dev-haskell/cabal."
 		die "cabal is not correctly installed"
 	fi
 	if [[ -z "${CABAL_HAS_BINARIES}" ]] && [[ -z "${CABAL_HAS_LIBRARIES}" ]]; then
 		eerror "QA: Neither bin nor lib are in CABAL_FEATURES."
 	fi
 	if [[ -n "${CABAL_UNKNOWN}" ]]; then
 		ewarn "Unknown entry in CABAL_FEATURES: ${CABAL_UNKNOWN}"
 	fi
 	if cabal-is-dummy-lib; then
 		einfo "${P} is included in ghc-${CABAL_CORE_LIB_GHC_PV}, nothing to install."
 	fi
 }

 # exported function: cabal-style bootstrap configure and compile
 cabal_src_compile() {
 	if ! cabal-is-dummy-lib; then
 		cabal-bootstrap
 		cabal-configure
 		cabal-build

 		if [[ -n "${CABAL_USE_HADDOCK}" ]] && use doc; then
 			cabal-haddock
 		fi
 	fi
 }

 haskell-cabal_src_compile() {
 	cabal_src_compile
 }

 # exported function: cabal-style copy and register
 cabal_src_install() {
 	if cabal-is-dummy-lib; then
 		# create a dummy local package conf file for the sake of ghc-updater
 		dodir "$(ghc-confdir)"
 		echo '[]' > "${D}/$(ghc-confdir)/$(ghc-localpkgconf)"
 	else
 		cabal-copy
 		cabal-pkg

 		if [[ -n "${CABAL_USE_HADDOCK}" ]] && use doc; then
 			if ! version_is_at_least "1.1.6" "$(cabal-version)"; then
 				dohtml -r dist/doc/html/*
 			fi
 		fi
 	fi
 }
 haskell-cabal_src_install() {
 	cabal_src_install
 }

 EXPORT_FUNCTIONS pkg_setup src_compile src_install
	# Copyright 1999-2006 Gentoo Foundation
	# Distributed under the terms of the GNU General Public License v2
	# $Header: /var/cvsroot/gentoo-x86/eclass/haskell-cabal.eclass,v 1.18 2010/01/26 20:50:40 kolmodin Exp $
	#
	# Original authors: Andres Loeh <kosmikus@gentoo.org>
	# Duncan Coutts <dcoutts@gentoo.org>
	# Maintained by: Haskell herd <haskell@gentoo.org>
	#
	# This eclass is for packages that make use of the
	# Haskell Common Architecture for Building Applications
	# and Libraries (cabal).
	#
	# Basic instructions:
	#
	# Before inheriting the eclass, set CABAL_FEATURES to
	# reflect the tools and features that the package makes
	# use of.
	#
	# Currently supported features:
	# haddock -- for documentation generation
	# alex -- lexer/scanner generator
	# happy -- parser generator
	# c2hs -- C interface generator
	# cpphs -- C preprocessor clone written in Haskell
	# profile -- if package supports to build profiling-enabled libraries
	# bootstrap -- only used for the cabal package itself
	# bin -- the package installs binaries
	# lib -- the package installs libraries
	# nocabaldep -- don't add dependency on cabal.
	# only used for packages that _must_ not pull the dependency
	# on cabal, but still use this eclass (e.g. haskell-updater).
	#
	# Dependencies on other cabal packages have to be specified
	# correctly.
	#
	# Cabal libraries should usually be SLOTted with "${PV}".
	#
	# Many Cabal packages require S to be manually set.
	#
	# Conforming Cabal packages don't require any function definitions
	# in the ebuild.
	#
	# Special flags to Cabal Configure can now be set by using
	# CABAL_CONFIGURE_FLAGS

	inherit ghc-package multilib


	for feature in ${CABAL_FEATURES}; do
	case ${feature} in
	haddock) CABAL_USE_HADDOCK=yes;;
	alex) CABAL_USE_ALEX=yes;;
	happy) CABAL_USE_HAPPY=yes;;
	c2hs) CABAL_USE_C2HS=yes;;
	cpphs) CABAL_USE_CPPHS=yes;;
	profile) CABAL_USE_PROFILE=yes;;
	bootstrap) CABAL_BOOTSTRAP=yes;;
	bin) CABAL_HAS_BINARIES=yes;;
	lib) CABAL_HAS_LIBRARIES=yes;;
	nocabaldep) CABAL_FROM_GHC=yes;;
	*) CABAL_UNKNOWN="${CABAL_UNKNOWN} ${feature}";;
	esac
	done

	if [[ -n "${CABAL_USE_HADDOCK}" ]]; then
	IUSE="${IUSE} doc"
	DEPEND="${DEPEND} doc? ( dev-haskell/haddock )"
	fi

	if [[ -n "${CABAL_USE_ALEX}" ]]; then
	DEPEND="${DEPEND} dev-haskell/alex"
	cabalconf="${cabalconf} --with-alex=/usr/bin/alex"
	fi

	if [[ -n "${CABAL_USE_HAPPY}" ]]; then
	DEPEND="${DEPEND} dev-haskell/happy"
	cabalconf="${cabalconf} --with-happy=/usr/bin/happy"
	fi

	if [[ -n "${CABAL_USE_C2HS}" ]]; then
	DEPEND="${DEPEND} dev-haskell/c2hs"
	cabalconf="${cabalconf} --with-c2hs=/usr/bin/c2hs"
	fi

	if [[ -n "${CABAL_USE_CPPHS}" ]]; then
	DEPEND="${DEPEND} dev-haskell/cpphs"
	cabalconf="${cabalconf} --with-cpphs=/usr/bin/cpphs"
	fi

	if [[ -n "${CABAL_USE_PROFILE}" ]]; then
	IUSE="${IUSE} profile"
	fi

	# We always use a standalone version of Cabal, rather than the one that comes
	# with GHC. But of course we can't depend on cabal when building cabal itself.
	if [[ -z ${CABAL_MIN_VERSION} ]]; then
	CABAL_MIN_VERSION=1.1.4
	fi
	if [[ -z "${CABAL_BOOTSTRAP}" && -z "${CABAL_FROM_GHC}" ]]; then
	DEPEND="${DEPEND} >=dev-haskell/cabal-${CABAL_MIN_VERSION}"
	fi

	# Libraries require GHC to be installed.
	if [[ -n "${CABAL_HAS_LIBRARIES}" ]]; then
	RDEPEND="${RDEPEND} dev-lang/ghc"
	fi

	# returns the version of cabal currently in use
	_CABAL_VERSION_CACHE=""
	cabal-version() {
	if [[ -z "${_CABAL_VERSION_CACHE}" ]]; then
	if [[ "${CABAL_BOOTSTRAP}" ]]; then
	# We're bootstrapping cabal, so the cabal version is the version
	# of this package itself.
	_CABAL_VERSION_CACHE="${PV}"
	elif [[ "${CABAL_FROM_GHC}" ]]; then
	# We can't assume there's a version of Cabal installed by ebuild as
	# this might be a first time install of GHC (for packages that
	# use the shipped Cabal like haskell-updater).

	# The user is likely to only have one version of Cabal, provided
	# by GHC. Note that dev-haskell/cabal can be a dummy package, only
	# using the version provided by GHC. If the user has another version
	# of Cabal too (more recent than the one GHC provides through
	# dev-haskell/cabal, or possibly older if he used an old
	# Cabal package) the most recent is used (expected to be the last
	# one in the ghc-pkg output).
	_CABAL_VERSION_CACHE="$(ghc-pkg field Cabal version \| tail -n 1)"

	# Strip out the "version: " prefix
	_CABAL_VERSION_CACHE="${_CABAL_VERSION_CACHE#"version: "}"
	else
	# We ask portage, not ghc, so that we only pick up
	# portage-installed cabal versions.
	_CABAL_VERSION_CACHE="$(ghc-extractportageversion dev-haskell/cabal)"
	fi
	fi
	echo "${_CABAL_VERSION_CACHE}"
	}

	cabal-bootstrap() {
	local setupmodule
	local cabalpackage
	if [[ -f "${S}/Setup.lhs" ]]; then
	setupmodule="${S}/Setup.lhs"
	else
	if [[ -f "${S}/Setup.hs" ]]; then
	setupmodule="${S}/Setup.hs"
	else
	die "No Setup.lhs or Setup.hs found"
	fi
	fi

	# We build the setup program using the latest version of
	# cabal that we have installed
	if version_is_at_least "6.4" "$(ghc-version)"; then
	cabalpackage=Cabal-$(cabal-version)
	else
	# older ghc's don't support package versioning
	cabalpackage=Cabal
	fi
	einfo "Using cabal-$(cabal-version)."
	$(ghc-getghc) -package "${cabalpackage}" --make "${setupmodule}" -o setup \
	\|\| die "compiling ${setupmodule} failed"
	}

	cabal-mksetup() {
	local setupdir

	if [[ -n $1 ]]; then
	setupdir=$1
	else
	setupdir=${S}
	fi

	rm -f "${setupdir}"/Setup.{lhs,hs}

	echo 'import Distribution.Simple; main = defaultMainWithHooks defaultUserHooks' \
	> $setupdir/Setup.hs
	}

	cabal-haddock() {
	./setup haddock \|\| die "setup haddock failed"
	}

	cabal-configure() {
	if [[ -n "${CABAL_USE_HADDOCK}" ]] && use doc; then
	cabalconf="${cabalconf} --with-haddock=/usr/bin/haddock"
	fi
	if [[ -n "${CABAL_USE_PROFILE}" ]] && use profile; then
	cabalconf="${cabalconf} --enable-library-profiling"
	fi
	# Building GHCi libs on ppc64 causes "TOC overflow".
	if use ppc64; then
	cabalconf="${cabalconf} --disable-library-for-ghci"
	fi

	if version_is_at_least "1.4" "$(cabal-version)"; then
	# disable executable stripping for the executables, as portage will
	# strip by itself, and pre-stripping gives a QA warning.
	# cabal versions previous to 1.4 does not strip executables, and does
	# not accept the flag.
	# this fixes numerous bugs, amongst them;
	# bug #251881, bug #251882, bug #251884, bug #251886, bug #299494
	cabalconf="${cabalconf} --disable-executable-stripping"
	fi

	if version_is_at_least "1.2.0" "$(cabal-version)"; then
	cabalconf="${cabalconf} --docdir=/usr/share/doc/${PF}"
	# As of Cabal 1.2, configure is quite quiet. For diagnostic purposes
	# it's better if the configure chatter is in the build logs:
	cabalconf="${cabalconf} --verbose"
	fi
	# Note: with Cabal-1.1.6.x we do not have enough control
	# to put the docs into the right place. They're currently going
	# into /usr/share/${P}/ghc-x.y/doc/
	# rather than /usr/share/doc/${PF}/
	# Because we can only set the datadir, not the docdir.

	./setup configure \
	--ghc --prefix=/usr \
	--with-compiler="$(ghc-getghc)" \
	--with-hc-pkg="$(ghc-getghcpkg)" \
	--prefix=/usr \
	--libdir=/usr/$(get_libdir) \
	--libsubdir=${P}/ghc-$(ghc-version) \
	--datadir=/usr/share/ \
	--datasubdir=${P}/ghc-$(ghc-version) \
	${cabalconf} \
	${CABAL_CONFIGURE_FLAGS} \
	"$@" \|\| die "setup configure failed"
	}

	cabal-build() {
	unset LANG LC_ALL LC_MESSAGES
	./setup build \
	\|\| die "setup build failed"
	}

	cabal-copy() {
	./setup copy \
	--destdir="${D}" \
	\|\| die "setup copy failed"

	# cabal is a bit eager about creating dirs,
	# so remove them if they are empty
	rmdir "${D}/usr/bin" 2> /dev/null

	# GHC 6.4 has a bug in get/setPermission and Cabal 1.1.1 has
	# no workaround.
	# set the +x permission on executables
	if [[ -d "${D}/usr/bin" ]] ; then
	chmod +x "${D}/usr/bin/"*
	fi
	# TODO: do we still need this?
	}

	cabal-pkg() {
	# This does not actually register since we're using true instead
	# of ghc-pkg. So it just leaves the .installed-pkg-config and we can
	# register that ourselves (if it exists).
	local result
	local err

	if [[ -n ${CABAL_HAS_LIBRARIES} ]]; then
	if version_is_at_least "1.2.0" "$(cabal-version)"; then
	# Newer cabal can generate a package conf for us:
	./setup register --gen-pkg-config="${T}/${P}.conf"
	ghc-setup-pkg "${T}/${P}.conf"
	ghc-install-pkg
	else
	# With older cabal we have to hack it by replacing its ghc-pkg
	# with true and then just picking up the .installed-pkg-config
	# file and registering that ourselves (if it exists).
	sed -i "s\|$(ghc-getghcpkg)\|$(type -P true)\|" .setup-config
	./setup register \|\| die "setup register failed"
	if [[ -f .installed-pkg-config ]]; then
	ghc-setup-pkg .installed-pkg-config
	ghc-install-pkg
	else
	die "setup register has not generated a package configuration file"
	fi
	fi
	fi
	}

	# Some cabal libs are bundled along with some versions of ghc
	# eg filepath-1.0 comes with ghc-6.6.1
	# by putting CABAL_CORE_LIB_GHC_PV="6.6.1" in an ebuild we are declaring that
	# when building with this version of ghc, the ebuild is a dummy that is it will
	# install no files since the package is already included with ghc.
	# However portage still records the dependency and we can upgrade the package
	# to a later one that's not included with ghc.
	# You can also put a space separated list, eg CABAL_CORE_LIB_GHC_PV="6.6 6.6.1".
	cabal-is-dummy-lib() {
	for version in ${CABAL_CORE_LIB_GHC_PV[*]}; do
	[[ "$(ghc-version)" == "$version" ]] && return 0
	done
	return 1
	}

	# exported function: check if cabal is correctly installed for
	# the currently active ghc (we cannot guarantee this with portage)
	haskell-cabal_pkg_setup() {
	ghc-package_pkg_setup
	if [[ -z "${CABAL_BOOTSTRAP}" && -z "${CABAL_FROM_GHC}" ]] && ! ghc-sanecabal "${CABAL_MIN_VERSION}"; then
	eerror "The package dev-haskell/cabal is not correctly installed for"
	eerror "the currently active version of ghc ($(ghc-version)). Please"
	eerror "run ghc-updater or haskell-updater or re-build dev-haskell/cabal."
	die "cabal is not correctly installed"
	fi
	if [[ -z "${CABAL_HAS_BINARIES}" ]] && [[ -z "${CABAL_HAS_LIBRARIES}" ]]; then
	eerror "QA: Neither bin nor lib are in CABAL_FEATURES."
	fi
	if [[ -n "${CABAL_UNKNOWN}" ]]; then
	ewarn "Unknown entry in CABAL_FEATURES: ${CABAL_UNKNOWN}"
	fi
	if cabal-is-dummy-lib; then
	einfo "${P} is included in ghc-${CABAL_CORE_LIB_GHC_PV}, nothing to install."
	fi
	}

	# exported function: cabal-style bootstrap configure and compile
	cabal_src_compile() {
	if ! cabal-is-dummy-lib; then
	cabal-bootstrap
	cabal-configure
	cabal-build

	if [[ -n "${CABAL_USE_HADDOCK}" ]] && use doc; then
	cabal-haddock
	fi
	fi
	}

	haskell-cabal_src_compile() {
	cabal_src_compile
	}

	# exported function: cabal-style copy and register
	cabal_src_install() {
	if cabal-is-dummy-lib; then
	# create a dummy local package conf file for the sake of ghc-updater
	dodir "$(ghc-confdir)"
	echo '[]' > "${D}/$(ghc-confdir)/$(ghc-localpkgconf)"
	else
	cabal-copy
	cabal-pkg

	if [[ -n "${CABAL_USE_HADDOCK}" ]] && use doc; then
	if ! version_is_at_least "1.1.6" "$(cabal-version)"; then
	dohtml -r dist/doc/html/*
	fi
	fi
	fi
	}
	haskell-cabal_src_install() {
	cabal_src_install
	}

	EXPORT_FUNCTIONS pkg_setup src_compile src_install