[gentoo-commits] repo/gentoo:master commit in: dev-lang/ghc/, dev-lang/ghc/files/

[Sam James]

commit:     9f39f305a5e3ace79efb86f41638070f9c97fae5
Author:     Jack Todaro <solpeth <AT> posteo <DOT> org>
AuthorDate: Tue Feb  1 09:42:46 2022 +0000
Commit:     Sam James <sam <AT> gentoo <DOT> org>
CommitDate: Mon Jul  4 00:32:53 2022 +0000
URL:        https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=9f39f305

dev-lang/ghc: add 9.0.2 (no keywords)

Package-Manager: Portage-3.0.30, Repoman-3.0.3
Signed-off-by: Jack Todaro <solpeth <AT> posteo.org>
Closes: https://github.com/gentoo/gentoo/pull/24042
Signed-off-by: Sam James <sam <AT> gentoo.org>

 dev-lang/ghc/Manifest                              |   4 +
 dev-lang/ghc/files/ghc-9.0.2-CHOST-prefix.patch    |  17 +
 dev-lang/ghc/files/ghc-9.0.2-darwin.patch          |  31 +
 .../ghc/files/ghc-9.0.2-fix-tests-python310.patch  |  33 +
 dev-lang/ghc/files/ghc-9.0.2-modorigin.patch       |  24 +
 .../ghc/files/ghc-9.0.2-verbose-modunusable.patch  |  12 +
 dev-lang/ghc/ghc-9.0.2.ebuild                      | 824 +++++++++++++++++++++
 7 files changed, 945 insertions(+)

diff --git a/dev-lang/ghc/Manifest b/dev-lang/ghc/Manifest
index 0c3307d5e446..fde4b8f1e0c6 100644
--- a/dev-lang/ghc/Manifest
+++ b/dev-lang/ghc/Manifest
@@ -8,6 +8,8 @@ DIST ghc-8.8.4-src.tar.xz 19395252 BLAKE2B 6fa898b9552398a724f0452f5cc88ba073264
 DIST ghc-8.8.4-testsuite.tar.xz 1965820 BLAKE2B 3b715700561788b8abdc986961d533b91399461d57a1686ededb4ccc36881503cdc3fc126b9a7b204a728c24b9a9ca97320142348644367aca9b47c87a5b3b51 SHA512 79d8fb0ba8de0fb48c938bd54c8c3278f1895d8ce5c700ce8cf6b3fc550073bb757208e85d4f9818400ebecca96f51d9248b8bbdac9eb2995671756164d08c16
 DIST ghc-9.0.1-src.tar.xz 20782336 BLAKE2B 53eaf903081d705d641459fbc1e6fa7387a6039f9cd466b4708bda86e81252a84d80878d6eb956ec2e1e5b721a313e68eeb796f8345244ca62f536a7a3f0c6df SHA512 bee7950a5118be8d8cefe0db5070139a5a93ca21c5bc6f8bf453429831f0c44f5e0fb5ee569865d6b8b92749044ee4123be06920928ac7a1ec9cffa9404a3e53
 DIST ghc-9.0.1-testsuite.tar.xz 2322432 BLAKE2B 350df763c607dd89ba58ad6e856d815556159a9f088dc0b069de48ae87c1e874a45fad51159e65a3c9a9beed68602eeb2a2728dbce86277bd287455f46f6c53a SHA512 13fbe0f0ab5e2426820d0fb37f0a75e1198ef2a660398508806e8ef094fd23647ca3d386815a2118168d12253d8df3273043678dbb37cf3924c689dd0fd1932e
+DIST ghc-9.0.2-src.tar.xz 27270396 BLAKE2B 0a73d910d3ef11161f895849025fe37ce231932f7cde441fdf620cf8c51678060a804467879eb0ee5c0a30413604c56e28e2aa1cde01e45c620b76987d9c0c0e SHA512 32994c7d2b8f47bae604cd825bfcf9c788d79ce26d1d5f58bd73a7093e11ae6c3c17b31dc0c9e454dbf67ca169b942f92213c388d615768cae86055bf6094dee
+DIST ghc-9.0.2-testsuite.tar.xz 2403564 BLAKE2B 0e7f6fefb9c972f94073aca8b15147913ffa8d3cd3ff7fc63ef7e20b4efd8b443cf21f12e1ab0f5044790f6d8af6cf7788bda85a21b2f356ddface86eb896670 SHA512 b2375500ae837d74af8085d099899b5a7a589c59bdcc033ca0bd6e00f33c4f8d90b481e0c7c3de113e607fcfafdfe8edde4713e6d242b2d4ee87df2eb960c9c7
 DIST ghc-bin-8.10.4-i686-pc-linux-gnu.tbz2 123831294 BLAKE2B 1ca4c1b5c34c948011049a73d409c741db89658d10e311cffbe464c631c3733278fc7dede6ad27474832295ded2c26fd4d6419c760505255e29f7cb232a670a4 SHA512 1f87cf63651f7c0e5f7f55d1f4d7d7c48b0a911cc6673a899d4b92190d765b359f9c7d73c329969c1b76f1af102b7e2c18a80382c81d5dade9ac7dd57de4ef65
 DIST ghc-bin-8.10.4-x86_64-pc-linux-gnu.tbz2 122558873 BLAKE2B 9f07c7bdc3beccfa629d28b2524ccd2f4688a5c0036a45408f5ace2d530a2a0e42f95b3cda5037ebb365317999e1ae776c6f9d21692867abfe85e33f2892b1be SHA512 68bd70f94961547746a696aa2839e156c95858fda0c7ec5b2ecf802070724ab7102b0aa86bcbf93432170d521cce4af10f46b851b470e5dc49dfa5b07380f46d
 DIST ghc-bin-8.10.5-i686-pc-linux-gnu.tbz2 124356781 BLAKE2B 53c5d259a19f11db83d69f7a2f39090d623b07caf1859eb8bf0385183586f538d8eb3eadb06f56f4b7160fa82043eb0f7b8df1632d55af562b8b1cb21c08b4c3 SHA512 58676b4eaeef9e05f69b7c821e115f3a678487b0de696e702ff6378f7d8f23fafda997b0c19d52a730c22bf8012a99c01783d16d00e356fe12532156d5965fc6
@@ -18,3 +20,5 @@ DIST ghc-bin-8.8.4-i686-pc-linux-gnu.tbz2 120336081 BLAKE2B 55dfbb90d5e55c2af5e9
 DIST ghc-bin-8.8.4-x86_64-pc-linux-gnu.tbz2 118897883 BLAKE2B a180b2dd1a3bc222044ece809ad700aee29d0c3e75b57ee9af3ca33c9c0f59dbf36f68202f746d99f80915cb717a9c41fc12db507f1cb469981732703a06b9cc SHA512 9d4be02dbd9704c93ef18feb92ea30bd5d590df31f288bf1b364818424c5019ca9ada26eec88418199f90ae8f4459d0a9352104e3f3186bbdc241891eb1b66c4
 DIST ghc-bin-9.0.1-i686-pc-linux-gnu.tbz2 122955511 BLAKE2B b870f46cc78fcc1d715aafe7108951582cfd12495b4e9d804d4b66562c66a6a2b2d9513031aedc8f3630a0cdbb3257943304b05732301a084f89487452f2f2d9 SHA512 aafd4233c40f93b71e6ac1acc8a75e30d49b826e4bce6d9832836966fd5f6c4898963bd4c2f34577f4199c1d9a3f537ac1e7d87eab11e9fb5e849573580ed3fb
 DIST ghc-bin-9.0.1-x86_64-pc-linux-gnu.tbz2 121542968 BLAKE2B 837870e68138f8d97dc8b2aae90090cf02416628602ca4ba4417ac92b49155f10028b05ac465665b8872b32372a5cee075616983f2eacdebb0188bd2ce6a93d2 SHA512 0e8c6d2e6f32fac95588f7323a4e02dddfc9ec2476a82b97bf5a106d3810f7e638fda7124c53b5bbc563fce70f4436553c282d8ea2f1f5fdf4fcccfb15a2b079
+DIST ghc-bin-9.0.2-i686-pc-linux-gnu.tbz2 123509908 BLAKE2B 45614984803a7bfa266f99d4adb4b5f2ab7b9e5e89c6ecd501296fc99a1d96e798ccb9c832f8dcb15fff9725beb918a7b63e62ff13f59b6506a2ef17930c45d2 SHA512 e0b7f4474c16f0763a2f787027fbdfeb3125b48c987fa1196bc189fefad9f0bfa2806da62af46d61ca911f5275b578076e2b326acf39e0894a8daa9deda0843a
+DIST ghc-bin-9.0.2-x86_64-pc-linux-gnu.tbz2 121536759 BLAKE2B 4433e2d266f065d2b2944b711d622ec26288a2187ac03562257a671744b44da35110ce16ac6d76f7062a563488885326be073e0ff03c7e48250051c3b4763d96 SHA512 2de29a9ddbfd0fac797cdd628f3657ff38e6a153151849508bba75d36f84394ed77750435ff5cc1bdfcd30ef2b6e009bde965bd0a83e0496b5027239642f4b6c

diff --git a/dev-lang/ghc/files/ghc-9.0.2-CHOST-prefix.patch b/dev-lang/ghc/files/ghc-9.0.2-CHOST-prefix.patch
new file mode 100644
index 000000000000..204eb3ef7dcd
--- /dev/null
+++ b/dev-lang/ghc/files/ghc-9.0.2-CHOST-prefix.patch
@@ -0,0 +1,17 @@
+Strip versioning components from *HOST for Darwin and Solaris
+
+--- a/m4/fptools.m4
++++ b/m4/fptools.m4
+@@ -1358,6 +1358,12 @@
+   freebsd*)
+     $2="freebsd"
+     ;;
++  darwin*)
++    $2="darwin"
++	;;
++  solaris2.*)
++    $2="solaris2"
++	;;
+   *)
+     echo "Unknown OS $1"
+     exit 1

diff --git a/dev-lang/ghc/files/ghc-9.0.2-darwin.patch b/dev-lang/ghc/files/ghc-9.0.2-darwin.patch
new file mode 100644
index 000000000000..c3d8109e6ccc
--- /dev/null
+++ b/dev-lang/ghc/files/ghc-9.0.2-darwin.patch
@@ -0,0 +1,31 @@
+From d39a3409acd3c40fb018ec1c114f15d3ecef6ef9 Mon Sep 17 00:00:00 2001
+From: Sergei Trofimovich <slyfox@g.o>
+Date: Thu, 1 Jun 2017 22:30:05 +0100
+Subject: [PATCH] aclocal.m4: add support for versioned darwin triplets
+
+The change adds support for 'darwin*' OS:
+    $ ./configure --target=aarch64-apple-darwin14
+
+Reported-by: jp_rider
+Signed-off-by: Sergei Trofimovich <slyfox@g.o>
+---
+ aclocal.m4 | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/aclocal.m4 b/aclocal.m4
+index 7ad9c36453..437974a0c7 100644
+--- a/m4/fptools.m4
++++ b/m4/fptools.m4
+@@ -1906,6 +1906,9 @@ AC_DEFUN([GHC_CONVERT_OS],[
+       aix*) # e.g. powerpc-ibm-aix7.1.3.0
+         $3="aix"
+         ;;
++      darwin*) # e.g. aarch64-apple-darwin14
++        $3="darwin"
++        ;;
+       freebsd*) # like i686-gentoo-freebsd7
+                 #      i686-gentoo-freebsd8
+                 #      i686-gentoo-freebsd8.2
+-- 
+2.14.1
+

diff --git a/dev-lang/ghc/files/ghc-9.0.2-fix-tests-python310.patch b/dev-lang/ghc/files/ghc-9.0.2-fix-tests-python310.patch
new file mode 100644
index 000000000000..c59cfcbfc4a2
--- /dev/null
+++ b/dev-lang/ghc/files/ghc-9.0.2-fix-tests-python310.patch
@@ -0,0 +1,33 @@
+From 81a8f7a7daeb87db53d598ced4b303f8f320442f Mon Sep 17 00:00:00 2001
+From: Zubin Duggal <zubin.duggal@×××××.com>
+Date: Wed, 12 Jan 2022 23:01:40 +0530
+Subject: [PATCH] testsuite: Fix import on python 3.10
+
+---
+ testsuite/driver/testlib.py | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/testsuite/driver/testlib.py b/testsuite/driver/testlib.py
+index fb2a7010f59..6b6462f527b 100644
+--- a/testsuite/driver/testlib.py
++++ b/testsuite/driver/testlib.py
+@@ -16,6 +16,7 @@ import sys
+ from math import ceil, trunc, floor, log
+ from pathlib import Path, PurePath
+ import collections
++import collections.abc
+ import subprocess
+ 
+ from testglobals import config, ghc_env, default_testopts, brokens, t, \
+@@ -907,7 +908,7 @@ def join_normalisers(*a):
+         Taken from http://stackoverflow.com/a/2158532/946226
+         """
+         for el in l:
+-            if (isinstance(el, collections.Iterable)
++            if (isinstance(el, collections.abc.Iterable)
+                 and not isinstance(el, (bytes, str))):
+                 for sub in flatten(el):
+                     yield sub
+-- 
+GitLab
+

diff --git a/dev-lang/ghc/files/ghc-9.0.2-modorigin.patch b/dev-lang/ghc/files/ghc-9.0.2-modorigin.patch
new file mode 100644
index 000000000000..3c7053778e98
--- /dev/null
+++ b/dev-lang/ghc/files/ghc-9.0.2-modorigin.patch
@@ -0,0 +1,24 @@
+diff --git a/compiler/GHC/Unit/State.hs b/compiler/GHC/Unit/State.hs
+index cefa5e5058bf68e68aaafadad0c7874189bf8225..92b38443c8378eb69db19a40d23abca47d6acee8 100644
+--- a/compiler/GHC/Unit/State.hs
++++ b/compiler/GHC/Unit/State.hs
+@@ -224,14 +224,16 @@ fromFlag :: ModuleOrigin
+ fromFlag = ModOrigin Nothing [] [] True
+ 
+ instance Semigroup ModuleOrigin where
+-    ModOrigin e res rhs f <> ModOrigin e' res' rhs' f' =
++    x@(ModOrigin e res rhs f) <> y@(ModOrigin e' res' rhs' f') =
+         ModOrigin (g e e') (res ++ res') (rhs ++ rhs') (f || f')
+       where g (Just b) (Just b')
+                 | b == b'   = Just b
+-                | otherwise = panic "ModOrigin: package both exposed/hidden"
++                | otherwise = pprPanic "ModOrigin: package both exposed/hidden" $
++                    text "x: " <> ppr x $$ text "y: " <> ppr y
+             g Nothing x = x
+             g x Nothing = x
+-    _x <> _y = panic "ModOrigin: hidden module redefined"
++    x <> y = pprPanic "ModOrigin: hidden module redefined" $
++                 text "x: " <> ppr x $$ text "y: " <> ppr y
+ 
+ instance Monoid ModuleOrigin where
+     mempty = ModOrigin Nothing [] [] False

diff --git a/dev-lang/ghc/files/ghc-9.0.2-verbose-modunusable.patch b/dev-lang/ghc/files/ghc-9.0.2-verbose-modunusable.patch
new file mode 100644
index 000000000000..13d12efdc0ec
--- /dev/null
+++ b/dev-lang/ghc/files/ghc-9.0.2-verbose-modunusable.patch
@@ -0,0 +1,12 @@
+diff -urN ghc-9.0.2/compiler/GHC/Unit/State.hs ghc-9.0.2-r1/compiler/GHC/Unit/State.hs
+--- ghc-9.0.2/compiler/GHC/Unit/State.hs	2021-10-19 05:20:00.000000000 -0600
++++ ghc-9.0.2-r1/compiler/GHC/Unit/State.hs	2022-02-17 01:04:05.117930250 -0700
+@@ -194,7 +194,7 @@
+ 
+ instance Outputable ModuleOrigin where
+     ppr ModHidden = text "hidden module"
+-    ppr (ModUnusable _) = text "unusable module"
++    ppr (ModUnusable reason) = text "unusable module" $$ ppr reason
+     ppr (ModOrigin e res rhs f) = sep (punctuate comma (
+         (case e of
+             Nothing -> []

diff --git a/dev-lang/ghc/ghc-9.0.2.ebuild b/dev-lang/ghc/ghc-9.0.2.ebuild
new file mode 100644
index 000000000000..b39fe464ab9a
--- /dev/null
+++ b/dev-lang/ghc/ghc-9.0.2.ebuild
@@ -0,0 +1,824 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+# to make make a crosscompiler use crossdev and symlink ghc tree into
+# cross overlay. result would look like 'cross-sparc-unknown-linux-gnu/ghc'
+export CBUILD=${CBUILD:-${CHOST}}
+export CTARGET=${CTARGET:-${CHOST}}
+if [[ ${CTARGET} = ${CHOST} ]] ; then
+	if [[ ${CATEGORY/cross-} != ${CATEGORY} ]] ; then
+		export CTARGET=${CATEGORY/cross-}
+	fi
+fi
+
+PYTHON_COMPAT=( python3_{8..10} )
+inherit python-any-r1
+inherit autotools bash-completion-r1 eutils flag-o-matic ghc-package
+inherit multilib multiprocessing pax-utils toolchain-funcs prefix
+inherit check-reqs
+DESCRIPTION="The Glasgow Haskell Compiler"
+HOMEPAGE="https://www.haskell.org/ghc/"
+
+# we don't have any binaries yet
+arch_binaries=""
+
+BIN_PV=${PV}
+# sorted!
+#arch_binaries="$arch_binaries alpha? ( https://slyfox.uni.cx/~slyfox/distfiles/ghc-bin-${PV}-alpha.tbz2 )"
+#arch_binaries="$arch_binaries arm? ( https://slyfox.uni.cx/~slyfox/distfiles/ghc-bin-${PV}-armv7a-hardfloat-linux-gnueabi.tbz2 )"
+#arch_binaries="$arch_binaries arm64? ( https://slyfox.uni.cx/~slyfox/distfiles/ghc-bin-${PV}-aarch64-unknown-linux-gnu.tbz2 )"
+arch_binaries="$arch_binaries amd64? ( https://eidetic.codes/ghc-bin-${PV}-x86_64-pc-linux-gnu.tbz2 )"
+#arch_binaries="$arch_binaries ia64?  ( https://slyfox.uni.cx/~slyfox/distfiles/ghc-bin-${PV}-ia64-fixed-fiw.tbz2 )"
+#arch_binaries="$arch_binaries ppc? ( https://slyfox.uni.cx/~slyfox/distfiles/ghc-bin-${PV}-ppc.tbz2 )"
+#arch_binaries="$arch_binaries ppc64? ( https://slyfox.uni.cx/~slyfox/distfiles/ghc-bin-${PV}-ppc64.tbz2 )"
+#arch_binaries="$arch_binaries ppc64? ( !big-endian? ( https://slyfox.uni.cx/~slyfox/distfiles/ghc-bin-${PV}-powerpc64le-unknown-linux-gnu.tbz2 ) )"
+#arch_binaries="$arch_binaries sparc? ( https://slyfox.uni.cx/~slyfox/distfiles/ghc-bin-${PV}-sparc.tbz2 )"
+arch_binaries="$arch_binaries x86? ( https://eidetic.codes/ghc-bin-${PV}-i686-pc-linux-gnu.tbz2 )"
+
+# various ports:
+#arch_binaries="$arch_binaries x86-fbsd? ( https://slyfox.uni.cx/~slyfox/distfiles/ghc-bin-${PV}-x86-fbsd.tbz2 )"
+
+# 0 - yet
+yet_binary() {
+	case "${ARCH}" in
+		#alpha) return 0 ;;
+		#arm64) return 0 ;;
+		#arm) return 0 ;;
+		amd64) return 0 ;;
+		#ia64) return 0 ;;
+		#ppc) return 0 ;;
+		#ppc64)
+		#	use big-endian && return 0
+		#	return 0
+		#	;;
+		#sparc) return 0 ;;
+		x86) return 0 ;;
+		*) return 1 ;;
+	esac
+}
+
+GHC_PV=${PV}
+#GHC_PV=8.10.0.20200123 # uncomment only for -alpha, -beta, -rc ebuilds
+GHC_P=${PN}-${GHC_PV} # using ${P} is almost never correct
+
+SRC_URI="!binary? (
+	https://downloads.haskell.org/ghc/${PV/_/-}/${GHC_P}-src.tar.xz
+	test? ( https://downloads.haskell.org/ghc/${PV/_/-}/${GHC_P}-testsuite.tar.xz )
+)"
+S="${WORKDIR}"/${GHC_P}
+
+[[ -n $arch_binaries ]] && SRC_URI+=" !ghcbootstrap? ( $arch_binaries )"
+
+BUMP_LIBRARIES=(
+	# "hackage-name          hackage-version"
+)
+
+LICENSE="BSD"
+SLOT="0/${PV}"
+KEYWORDS=""
+IUSE="big-endian +doc elfutils ghcbootstrap ghcmakebinary +gmp numa profile test"
+IUSE+=" binary"
+RESTRICT="!test? ( test )"
+
+RDEPEND="
+	>=dev-lang/perl-5.6.1
+	dev-libs/gmp:0=
+	sys-libs/ncurses:=[unicode(+)]
+	elfutils? ( dev-libs/elfutils )
+	!ghcmakebinary? ( dev-libs/libffi:= )
+	numa? ( sys-process/numactl )
+"
+
+# This set of dependencies is needed to run
+# prebuilt ghc. We specifically avoid ncurses
+# dependency with:
+#    utils/ghc-pkg_HC_OPTS += -DBOOTSTRAPPING
+PREBUILT_BINARY_DEPENDS="
+	!prefix? ( elibc_glibc? ( >=sys-libs/glibc-2.17 ) )
+"
+# This set of dependencies is needed to install
+# ghc[binary] in system. terminfo package is linked
+# against ncurses.
+PREBUILT_BINARY_RDEPENDS="${PREBUILT_BINARY_DEPENDS}
+	sys-libs/ncurses:0/6
+"
+
+RDEPEND+="binary? ( ${PREBUILT_BINARY_RDEPENDS} )"
+
+DEPEND="${RDEPEND}"
+BDEPEND="
+	virtual/pkgconfig
+	doc? ( app-text/docbook-xml-dtd:4.2
+		app-text/docbook-xml-dtd:4.5
+		app-text/docbook-xsl-stylesheets
+		dev-python/sphinx
+		>=dev-libs/libxslt-1.1.2 )
+	!ghcbootstrap? ( ${PREBUILT_BINARY_DEPENDS} )
+	test? ( ${PYTHON_DEPS} )
+"
+
+needs_python() {
+	# test driver is written in python
+	use test && return 0
+	return 1
+}
+
+# we build binaries without profiling support
+REQUIRED_USE="
+	?? ( ghcbootstrap binary )
+	?? ( profile binary )
+"
+
+# haskell libraries built with cabal in configure mode, #515354
+QA_CONFIGURE_OPTIONS+=" --with-compiler --with-gcc"
+
+is_crosscompile() {
+	[[ ${CHOST} != ${CTARGET} ]]
+}
+
+is_native() {
+	[[ ${CHOST} == ${CBUILD} ]] && [[ ${CHOST} == ${CTARGET} ]]
+}
+
+if ! is_crosscompile; then
+	PDEPEND="!ghcbootstrap? ( >=app-admin/haskell-updater-1.2 )"
+fi
+
+# returns tool prefix for crosscompiler.
+# Example:
+#  CTARGET=armv7a-unknown-linux-gnueabi
+#  CHOST=x86_64-pc-linux-gnu
+#    "armv7a-unknown-linux-gnueabi-"
+#  CTARGET=${CHOST}
+#    ""
+# Used in tools and library prefix:
+#    "${ED}"/usr/bin/$(cross)haddock
+#    "${ED}/usr/$(get_libdir)/$(cross)${GHC_P}/package.conf.d"
+
+cross() {
+	if is_crosscompile; then
+		echo "${CTARGET}-"
+	else
+		echo ""
+	fi
+}
+
+append-ghc-cflags() {
+	local persistent compile assemble link
+	local flag ghcflag
+
+	for flag in $*; do
+		case ${flag} in
+			persistent)	persistent="yes";;
+			compile)	compile="yes";;
+			assemble)	assemble="yes";;
+			link)		link="yes";;
+			*)
+				[[ ${compile}  ]] && ghcflag="-optc${flag}"  CFLAGS+=" ${flag}" && GHC_FLAGS+=" ${ghcflag}" &&
+					[[ ${persistent} ]] && GHC_PERSISTENT_FLAGS+=" ${ghcflag}"
+				[[ ${assemble} ]] && ghcflag="-opta${flag}"  CFLAGS+=" ${flag}" && GHC_FLAGS+=" ${ghcflag}" &&
+					[[ ${persistent} ]] && GHC_PERSISTENT_FLAGS+=" ${ghcflag}"
+				[[ ${link}     ]] && ghcflag="-optl${flag}" LDFLAGS+=" ${flag}" && GHC_FLAGS+=" ${ghcflag}" &&
+					[[ ${persistent} ]] && GHC_PERSISTENT_FLAGS+=" ${ghcflag}"
+				;;
+		esac
+	done
+}
+
+# $1 - lib name (under libraries/)
+# $2 - lib version
+# example: bump_lib "transformers" "0.4.2.0"
+bump_lib() {
+	local pn=$1 pv=$2
+	local p=${pn}-${pv}
+	local f
+
+	einfo "Bumping ${pn} up to ${pv}"
+
+	for f in ghc.mk GNUmakefile; do
+		mv libraries/"${pn}"/$f "${WORKDIR}"/"${p}"/$f || die
+	done
+	mv libraries/"${pn}" "${WORKDIR}"/"${pn}".old || die
+	mv "${WORKDIR}"/"${p}" libraries/"${pn}" || die
+}
+
+update_SRC_URI() {
+	local p pn pv
+	for p in "${BUMP_LIBRARIES[@]}"; do
+		set -- $p
+		pn=$1 pv=$2
+
+		SRC_URI+=" https://hackage.haskell.org/package/${pn}-${pv}/${pn}-${pv}.tar.gz"
+	done
+}
+
+update_SRC_URI
+
+bump_libs() {
+	local p pn pv
+	for p in "${BUMP_LIBRARIES[@]}"; do
+		set -- $p
+		pn=$1 pv=$2
+
+		bump_lib "${pn}" "${pv}"
+	done
+}
+
+ghc_setup_cflags() {
+	# TODO: plumb CFLAGS and BUILD_CFLAGS to respective CONF_CC_OPTS_STAGE<N>
+	if ! is_native; then
+		export CFLAGS=${GHC_CFLAGS-"-O2 -pipe"}
+		export LDFLAGS=${GHC_LDFLAGS-"-Wl,-O1"}
+		einfo "Crosscompiling mode:"
+		einfo "   CHOST:   ${CHOST}"
+		einfo "   CTARGET: ${CTARGET}"
+		einfo "   CFLAGS:  ${CFLAGS}"
+		einfo "   LDFLAGS: ${LDFLAGS}"
+		einfo "   prefix: $(cross)"
+		return
+	fi
+	# We need to be very careful with the CFLAGS we ask ghc to pass through to
+	# gcc. There are plenty of flags which will make gcc produce output that
+	# breaks ghc in various ways. The main ones we want to pass through are
+	# -mcpu / -march flags. These are important for arches like alpha & sparc.
+	# We also use these CFLAGS for building the C parts of ghc, ie the rts.
+	strip-flags
+	strip-unsupported-flags
+
+	# Cmm can't parse line numbers #482086
+	replace-flags -ggdb[3-9] -ggdb2
+
+	GHC_FLAGS=""
+	GHC_PERSISTENT_FLAGS=""
+	for flag in ${CFLAGS}; do
+		case ${flag} in
+
+			# Ignore extra optimisation (ghc passes -O to gcc anyway)
+			# -O2 and above break on too many systems
+			-O*) ;;
+
+			# Arch and ABI flags are what we're really after
+			-m*) append-ghc-cflags compile assemble ${flag};;
+
+			# Sometimes it's handy to see backtrace of RTS
+			# to get an idea what happens there
+			-g*) append-ghc-cflags compile ${flag};;
+
+			# Ignore all other flags, including all -f* flags
+		esac
+	done
+
+	for flag in ${LDFLAGS}; do
+		append-ghc-cflags link ${flag}
+	done
+
+	# GHC uses ${CBUILD}-gcc, ${CHOST}-gcc and ${CTARGET}-gcc at a single build.
+	# Skip any gentoo-specific tweaks for cross-case to avoid passing unsupported
+	# options to gcc.
+	if is_native; then
+		# prevent from failing to build unregisterised ghc:
+		# https://www.mail-archive.com/debian-bugs-dist@××××××××××××.org/msg171602.html
+		use ppc64 && append-ghc-cflags persistent compile -mminimal-toc
+	fi
+}
+
+# substitutes string $1 to $2 in files $3 $4 ...
+relocate_path() {
+	local from=$1
+	local   to=$2
+	shift 2
+	local file=
+	for file in "$@"
+	do
+		sed -i -e "s|$from|$to|g" \
+			"$file" || die "path relocation failed for '$file'"
+	done
+}
+
+# changes hardcoded ghc paths and updates package index
+# $1 - new absolute root path
+relocate_ghc() {
+	local to=$1 ghc_v=${BIN_PV}
+
+	# libdir for prebuilt binary and for current system may mismatch
+	# It does for prefix installation for example: bug #476998
+	local bin_ghc_prefix=${WORKDIR}/usr
+	local bin_libpath=$(echo "${bin_ghc_prefix}"/lib*)
+	local bin_libdir=${bin_libpath#${bin_ghc_prefix}/}
+
+	# backup original script to use it later after relocation
+	local gp_back="${T}/ghc-pkg-${ghc_v}-orig"
+	cp "${WORKDIR}/usr/bin/ghc-pkg-${ghc_v}" "$gp_back" || die "unable to backup ghc-pkg wrapper"
+
+	if [[ ${bin_libdir} != $(get_libdir) ]]; then
+		einfo "Relocating '${bin_libdir}' to '$(get_libdir)' (bug #476998)"
+		# moving the dir itself is not strictly needed
+		# but then USE=binary would result in installing
+		# in '${bin_libdir}'
+		mv "${bin_ghc_prefix}/${bin_libdir}" "${bin_ghc_prefix}/$(get_libdir)" || die
+
+		relocate_path "/usr/${bin_libdir}" "/usr/$(get_libdir)" \
+			"${WORKDIR}/usr/bin/ghc-${ghc_v}" \
+			"${WORKDIR}/usr/bin/ghci-${ghc_v}" \
+			"${WORKDIR}/usr/bin/ghc-pkg-${ghc_v}" \
+			"${WORKDIR}/usr/bin/hsc2hs" \
+			"${WORKDIR}/usr/bin/runghc-${ghc_v}" \
+			"$gp_back" \
+			"${WORKDIR}/usr/$(get_libdir)/${PN}-${ghc_v}/package.conf.d/"*
+	fi
+
+	# Relocate from /usr to ${EPREFIX}/usr
+	relocate_path "/usr" "${to}/usr" \
+		"${WORKDIR}/usr/bin/ghc-${ghc_v}" \
+		"${WORKDIR}/usr/bin/ghci-${ghc_v}" \
+		"${WORKDIR}/usr/bin/ghc-pkg-${ghc_v}" \
+		"${WORKDIR}/usr/bin/haddock-ghc-${ghc_v}" \
+		"${WORKDIR}/usr/bin/hp2ps" \
+		"${WORKDIR}/usr/bin/hpc" \
+		"${WORKDIR}/usr/bin/hsc2hs" \
+		"${WORKDIR}/usr/bin/runghc-${ghc_v}" \
+		"${WORKDIR}/usr/$(get_libdir)/${PN}-${ghc_v}/package.conf.d/"*
+
+	# this one we will use to regenerate cache
+	# so it should point to current tree location
+	relocate_path "/usr" "${WORKDIR}/usr" "$gp_back"
+
+	if use prefix; then
+		hprefixify "${bin_libpath}"/${PN}*/settings
+	fi
+
+	# regenerate the binary package cache
+	"$gp_back" recache || die "failed to update cache after relocation"
+	rm "$gp_back"
+}
+
+ghc-check-reqs() {
+	# These are pessimistic values (slightly bigger than worst-case)
+	# Worst case is UNREG USE=profile ia64. See bug #611866 for some
+	# numbers on various arches.
+	CHECKREQS_DISK_BUILD=8G
+	CHECKREQS_DISK_USR=2G
+	# USE=binary roughly takes
+	use binary && CHECKREQS_DISK_BUILD=4G
+
+	"$@"
+}
+
+pkg_pretend() {
+	ghc-check-reqs check-reqs_pkg_pretend
+}
+
+pkg_setup() {
+	ghc-check-reqs check-reqs_pkg_setup
+
+	# quiet portage about prebuilt binaries
+	use binary && QA_PREBUILT="*"
+
+	[[ ${MERGE_TYPE} == binary ]] && return
+
+	if use ghcbootstrap; then
+		ewarn "You requested ghc bootstrapping, this is usually only used"
+		ewarn "by Gentoo developers to make binary .tbz2 packages."
+
+		[[ -z $(type -P ghc) ]] && \
+			die "Could not find a ghc to bootstrap with."
+	else
+		if ! yet_binary; then
+			eerror "Please try emerging with USE=ghcbootstrap and report build"
+			eerror "sucess or failure to the haskell team (haskell@g.o)"
+			die "No binary available for '${ARCH}' arch yet, USE=ghcbootstrap"
+		fi
+	fi
+
+	if needs_python; then
+		python-any-r1_pkg_setup
+	fi
+}
+
+src_unpack() {
+	# Create the ${S} dir if we're using the binary version
+	use binary && mkdir "${S}"
+
+	# the Solaris and Darwin binaries from ghc (maeder) need to be
+	# unpacked separately, so prevent them from being unpacked
+	local ONLYA=${A}
+	case ${CHOST} in
+		*-darwin* | *-solaris*)  ONLYA=${GHC_P}-src.tar.xz  ;;
+	esac
+	unpack ${ONLYA}
+}
+
+src_prepare() {
+	ghc_setup_cflags
+
+	if ! use ghcbootstrap && [[ ${CHOST} != *-darwin* && ${CHOST} != *-solaris* ]]; then
+		# Modify the wrapper script from the binary tarball to use GHC_PERSISTENT_FLAGS.
+		# See bug #313635.
+		sed -i -e "s|\"\$topdir\"|\"\$topdir\" ${GHC_PERSISTENT_FLAGS}|" \
+			"${WORKDIR}/usr/bin/ghc-${BIN_PV}"
+
+		# allow hardened users use vanilla binary to bootstrap ghc
+		# ghci uses mmap with rwx protection at it implements dynamic
+		# linking on it's own (bug #299709)
+		pax-mark -m "${WORKDIR}/usr/$(get_libdir)/${PN}-${BIN_PV}/bin/ghc"
+	fi
+
+	if use binary; then
+		if use prefix; then
+			relocate_ghc "${EPREFIX}"
+		fi
+
+		# Move unpacked files to the expected place
+		mv "${WORKDIR}/usr" "${S}"
+		eapply_user
+	else
+		if ! use ghcbootstrap; then
+			case ${CHOST} in
+				*-darwin* | *-solaris*)
+				# UPDATE ME for ghc-7
+				mkdir "${WORKDIR}"/ghc-bin-installer || die
+				pushd "${WORKDIR}"/ghc-bin-installer > /dev/null || die
+				use sparc-solaris && unpack ghc-6.10.4-sparc-sun-solaris2.tar.bz2
+				use x86-solaris && unpack ghc-7.0.3-i386-unknown-solaris2.tar.bz2
+				use x86-macos && unpack ghc-7.4.1-i386-apple-darwin.tar.bz2
+				use x64-macos && unpack ghc-7.4.1-x86_64-apple-darwin.tar.bz2
+				popd > /dev/null
+
+				pushd "${WORKDIR}"/ghc-bin-installer/ghc-[67].?*.? > /dev/null || die
+				# fix the binaries so they run, on Solaris we need an
+				# LD_LIBRARY_PATH which has our prefix libdirs, on
+				# Darwin we need to replace the frameworks with our libs
+				# from the prefix fix before installation, because some
+				# of the tools are actually used during configure/make
+				if [[ ${CHOST} == *-solaris* ]] ; then
+					export LD_LIBRARY_PATH="${EPREFIX}/$(get_libdir):${EPREFIX}/usr/$(get_libdir):${LD_LIBRARY_PATH}"
+				elif [[ ${CHOST} == *-darwin* ]] ; then
+					local readline_framework=GNUreadline.framework/GNUreadline
+					local gmp_framework=/opt/local/lib/libgmp.10.dylib
+					local ncurses_file=/opt/local/lib/libncurses.5.dylib
+					for binary in $(scanmacho -BRE MH_EXECUTE -F '%F' .) ; do
+						install_name_tool -change \
+							${readline_framework} \
+							"${EPREFIX}"/lib/libreadline.dylib \
+							${binary} || die
+						install_name_tool -change \
+							${gmp_framework} \
+							"${EPREFIX}"/usr/lib/libgmp.dylib \
+							${binary} || die
+						install_name_tool -change \
+							${ncurses_file} \
+							"${EPREFIX}"/usr/lib/libncurses.dylib \
+							${binary} || die
+					done
+					# we don't do frameworks!
+					sed -i \
+						-e 's/\(frameworks = \)\["GMP"\]/\1[]/g' \
+						-e 's/\(extraLibraries = \)\["m"\]/\1["m","gmp"]/g' \
+						rts/package.conf.in || die
+				fi
+
+				# it is autoconf, but we really don't want to give it too
+				# many arguments, in fact we do the make in-place anyway
+				./configure --prefix="${WORKDIR}"/usr || die
+				make install || die
+				popd > /dev/null
+				;;
+				*)
+				relocate_ghc "${WORKDIR}"
+				;;
+			esac
+		fi
+
+		sed -i -e "s|\"\$topdir\"|\"\$topdir\" ${GHC_PERSISTENT_FLAGS}|" \
+			"${S}/ghc/ghc.wrapper"
+
+		cd "${S}" # otherwise eapply will break
+
+		eapply "${FILESDIR}"/${PN}-9.0.2-CHOST-prefix.patch
+		eapply "${FILESDIR}"/${PN}-9.0.2-darwin.patch
+
+		# Below patch should not be needed by ghc-9.2
+		eapply "${FILESDIR}"/${PN}-9.0.2-modorigin.patch
+
+		# ModUnusable pretty-printing should include the reason
+		eapply "${FILESDIR}/${PN}-9.0.2-verbose-modunusable.patch"
+
+		# Needed for testing with python-3.10
+		use test && eapply "${FILESDIR}/${PN}-9.0.2-fix-tests-python310.patch"
+
+		#needs a port?
+		#eapply "${FILESDIR}"/${PN}-8.8.1-revert-CPP.patch
+		eapply "${FILESDIR}"/${PN}-8.10.1-allow-cross-bootstrap.patch
+		#eapply "${FILESDIR}"/${PN}-8.10.3-C99-typo-ac270.patch
+
+		# a bunch of crosscompiler patches
+		# needs newer version:
+		#eapply "${FILESDIR}"/${PN}-8.2.1_rc1-hp2ps-cross.patch
+
+		# mingw32 target
+		pushd "${S}/libraries/Win32"
+			eapply "${FILESDIR}"/${PN}-8.2.1_rc1-win32-cross-2-hack.patch # bad workaround
+		popd
+
+		bump_libs
+
+		eapply_user
+		# as we have changed the build system
+		eautoreconf
+	fi
+}
+
+src_configure() {
+	if ! use binary; then
+		# initialize build.mk
+		echo '# Gentoo changes' > mk/build.mk
+
+		# Put docs into the right place, ie /usr/share/doc/ghc-${GHC_PV}
+		echo "docdir = ${EPREFIX}/usr/share/doc/$(cross)${PF}" >> mk/build.mk
+		echo "htmldir = ${EPREFIX}/usr/share/doc/$(cross)${PF}" >> mk/build.mk
+
+		# We also need to use the GHC_FLAGS flags when building ghc itself
+		echo "SRC_HC_OPTS+=${HCFLAGS} ${GHC_FLAGS}" >> mk/build.mk
+		echo "SRC_CC_OPTS+=${CFLAGS}" >> mk/build.mk
+		echo "SRC_LD_OPTS+=${LDFLAGS}" >> mk/build.mk
+		# Speed up initial Cabal bootstrap
+		echo "utils/ghc-cabal_dist_EXTRA_HC_OPTS+=$(ghc-make-args)" >> mk/build.mk
+
+		# We can't depend on haddock except when bootstrapping when we
+		# must build docs and include them into the binary .tbz2 package
+		# app-text/dblatex is not in portage, can not build PDF or PS
+		echo "BUILD_SPHINX_PDF  = NO"  >> mk/build.mk
+		echo "BUILD_SPHINX_HTML = $(usex doc YES NO)" >> mk/build.mk
+		echo "BUILD_MAN = $(usex doc YES NO)" >> mk/build.mk
+
+		# this controls presence on 'xhtml' and 'haddock' in final install
+		echo "HADDOCK_DOCS       = YES" >> mk/build.mk
+
+		# not used outside of ghc's test
+		if [[ -n ${GHC_BUILD_DPH} ]]; then
+				echo "BUILD_DPH = YES" >> mk/build.mk
+			else
+				echo "BUILD_DPH = NO" >> mk/build.mk
+		fi
+
+		# Any non-native build has to skip as it needs
+		# target haddock binary to be runnabine.
+		if ! is_native; then
+			# disable docs generation as it requires running stage2
+			echo "HADDOCK_DOCS=NO" >> mk/build.mk
+			echo "BUILD_SPHINX_HTML=NO" >> mk/build.mk
+			echo "BUILD_SPHINX_PDF=NO" >> mk/build.mk
+		fi
+
+		if is_crosscompile; then
+			# Install ghc-stage1 crosscompiler instead of
+			# ghc-stage2 cross-built compiler.
+			echo "Stage1Only=YES" >> mk/build.mk
+		fi
+
+		# allows overriding build flavours for libraries:
+		# v   - vanilla (static libs)
+		# p   - profiled
+		# dyn - shared libraries
+		# example: GHC_LIBRARY_WAYS="v dyn"
+		if [[ -n ${GHC_LIBRARY_WAYS} ]]; then
+			echo "GhcLibWays=${GHC_LIBRARY_WAYS}" >> mk/build.mk
+		fi
+		echo "BUILD_PROF_LIBS = $(usex profile YES NO)" >> mk/build.mk
+
+		# Get ghc from the unpacked binary .tbz2
+		# except when bootstrapping we just pick ghc up off the path
+		if ! use ghcbootstrap; then
+			export PATH="${WORKDIR}/usr/bin:${PATH}"
+		fi
+
+		echo "BIGNUM_BACKEND = $(usex gmp gmp native)" >> mk/build.mk
+
+		# don't strip anything. Very useful when stage2 SIGSEGVs on you
+		echo "STRIP_CMD = :" >> mk/build.mk
+
+		local econf_args=()
+
+		# GHC embeds toolchain it was built by and uses it later.
+		# Don't allow things like ccache or versioned binary slip.
+		# We use stable thing across gcc upgrades.
+		# User can use EXTRA_ECONF=CC=... to override this default.
+		econf_args+=(
+			AR=${CTARGET}-ar
+			CC=${CTARGET}-gcc
+			# these should be inferred by GHC but ghc defaults
+			# to using bundled tools on windows.
+			Windres=${CTARGET}-windres
+			DllWrap=${CTARGET}-dllwrap
+			# we set the linker explicitly below
+			--disable-ld-override
+		)
+		case ${CTARGET} in
+			arm*)
+				# ld.bfd-2.28 does not work for ghc. Force ld.gold
+				# instead. This should be removed once gentoo gets
+				# a fix for R_ARM_COPY bug: https://sourceware.org/PR16177
+				econf_args+=(LD=${CTARGET}-ld.gold)
+			;;
+			sparc*)
+				# ld.gold-2.28 does not work for ghc. Force ld.bfd
+				# instead. This should be removed once gentoo gets
+				# a fix for missing --no-relax support bug:
+				# https://sourceware.org/ml/binutils/2017-07/msg00183.html
+				econf_args+=(LD=${CTARGET}-ld.bfd)
+			;;
+			*)
+				econf_args+=(LD=${CTARGET}-ld)
+		esac
+
+		if [[ ${CBUILD} != ${CHOST} ]]; then
+			# GHC bug: ghc claims not to support cross-building.
+			# It does, but does not distinct --host= value
+			# for stage1 and stage2 compiler.
+			econf_args+=(--host=${CBUILD})
+		fi
+
+		if use ghcmakebinary; then
+			# When building booting libary we are trying to
+			# bundle or restrict most of external depends
+			# with unstable ABI:
+			#  - embed libffi (default GHC behaviour)
+			#  - disable ncurses support for ghci (via haskeline)
+			#    https://bugs.gentoo.org/557478
+			#  - disable ncurses support for ghc-pkg
+			echo "libraries/haskeline_CONFIGURE_OPTS += --flag=-terminfo" >> mk/build.mk
+			echo "utils/ghc-pkg_HC_OPTS += -DBOOTSTRAPPING" >> mk/build.mk
+		elif is_native; then
+			# using ${GTARGET}'s libffi is not supported yet:
+			# GHC embeds full path for ffi includes without /usr/${CTARGET} account.
+			econf_args+=(--with-system-libffi)
+			econf_args+=(--with-ffi-includes=$($(tc-getPKG_CONFIG) libffi --cflags-only-I | sed -e 's@^-I@@'))
+		fi
+
+		einfo "Final mk/build.mk:"
+		cat mk/build.mk || die
+
+		econf ${econf_args[@]} \
+			--enable-bootstrap-with-devel-snapshot \
+			$(use_enable elfutils dwarf-unwind) \
+			$(use_enable numa)
+
+		if [[ ${PV} == *9999* ]]; then
+			GHC_PV="$(grep 'S\[\"PACKAGE_VERSION\"\]' config.status | sed -e 's@^.*=\"\(.*\)\"@\1@')"
+			GHC_P=${PN}-${GHC_PV}
+		fi
+	fi # ! use binary
+}
+
+src_compile() {
+	if ! use binary; then
+		# Stage1Only crosscompiler does not build stage2
+		if ! is_crosscompile; then
+			# 1. build/pax-mark compiler binary first
+			emake ghc/stage2/build/tmp/ghc-stage2
+			# 2. pax-mark (bug #516430)
+			pax-mark -m ghc/stage2/build/tmp/ghc-stage2
+			# 2. build/pax-mark haddock using ghc-stage2
+			if is_native; then
+				# non-native build does not build haddock
+				# due to HADDOCK_DOCS=NO, but it could.
+				emake utils/haddock/dist/build/tmp/haddock
+				pax-mark -m utils/haddock/dist/build/tmp/haddock
+			fi
+		fi
+		# 3. and then all the rest
+		emake all
+	fi # ! use binary
+}
+
+src_test() {
+	# TODO: deal with:
+	#    - sandbox (pollutes environment)
+	#    - extra packages (to extend testsuite coverage)
+	# bits are taken from 'validate'
+	local make_test_target='test' # can be fulltest
+	# not 'emake' as testsuite uses '$MAKE' without jobserver available
+	make $make_test_target stage=2 THREADS=$(makeopts_jobs)
+}
+
+src_install() {
+	if use binary; then
+		use prefix && mkdir -p "${ED}"
+		mv "${S}/usr" "${ED}"
+	else
+		[[ -f VERSION ]] || emake VERSION
+
+		# -j1 due to a rare race in install script:
+		#    make --no-print-directory -f ghc.mk phase=final install
+		#    /usr/lib/portage/python3.4/ebuild-helpers/xattr/install -c -m 755 \
+		#        -d "/tmp/portage-tmpdir/portage/cross-armv7a-unknown-linux-gnueabi/ghc-9999/image/usr/lib64/armv7a-unknown-linux-gnueabi-ghc-8.3.20170404/include"
+		#    /usr/lib/portage/python3.4/ebuild-helpers/xattr/install -c -m 644  utils/hsc2hs/template-hsc.h \
+		#           "/tmp/portage-tmpdir/portage/cross-armv7a-unknown-linux-gnueabi/ghc-9999/image/usr/lib64/armv7a-unknown-linux-gnueabi-ghc-8.3.20170404"
+		#    /usr/bin/install: cannot create regular file \
+		#           '/tmp/portage-tmpdir/portage/cross-armv7a-unknown-linux-gnueabi/ghc-9999/image/usr/lib64/armv7a-unknown-linux-gnueabi-ghc-8.3.20170404': No such file or directory
+		emake -j1 install DESTDIR="${D}"
+
+		# Skip for cross-targets as they all share target location:
+		# /usr/share/doc/ghc-9999/
+		if ! is_crosscompile; then
+			dodoc "distrib/README" "LICENSE" "VERSION"
+		fi
+
+		# rename ghc-shipped files to avoid collision
+		# of external packages. Motivating example:
+		#  user had installed:
+		#      dev-lang/ghc-7.8.4-r0 (with transformers-0.3.0.0)
+		#      dev-haskell/transformers-0.4.2.0
+		#  then user tried to update to
+		#      dev-lang/ghc-7.8.4-r1 (with transformers-0.4.2.0)
+		#  this will lead to single .conf file collision.
+		local shipped_conf renamed_conf
+		local package_confdir="${ED}/usr/$(get_libdir)/$(cross)${GHC_P}/package.conf.d"
+		for shipped_conf in "${package_confdir}"/*.conf; do
+			# rename 'pkg-ver-id.conf' to 'pkg-ver-id-gentoo-${PF}.conf'
+			renamed_conf=${shipped_conf%.conf}-gentoo-${PF}.conf
+			mv "${shipped_conf}" "${renamed_conf}" || die
+		done
+
+		# remove link, but leave 'haddock-${GHC_P}'
+		rm -f "${ED}"/usr/bin/$(cross)haddock
+
+		if ! is_crosscompile; then
+			newbashcomp "${FILESDIR}"/ghc-bash-completion ghc-pkg
+			newbashcomp utils/completion/ghc.bash         ghc
+		fi
+	fi
+
+	# path to the package.cache
+	local package_confdir="${ED}/usr/$(get_libdir)/$(cross)${GHC_P}/package.conf.d"
+	PKGCACHE="${package_confdir}"/package.cache
+	# copy the package.conf.d, including timestamp, save it so we can help
+	# users that have a broken package.conf.d
+	cp -pR "${package_confdir}"{,.initial} || die "failed to backup intial package.conf.d"
+
+	# copy the package.conf, including timestamp, save it so we later can put it
+	# back before uninstalling, or when upgrading.
+	cp -p "${PKGCACHE}"{,.shipped} \
+		|| die "failed to copy package.conf.d/package.cache"
+
+	if is_crosscompile; then
+		# When we build a cross-compiler the layout is the following:
+		#     usr/lib/${CTARGET}-ghc-${VER}/ contains target libraries
+		# but
+		#     usr/lib/${CTARGET}-ghc-${VER}/bin/ directory
+		# containst host binaries (modulo bugs).
+
+		# Portage's stripping mechanism does not skip stripping
+		# foreign binaries. This frequently causes binaries to be
+		# broken.
+		#
+		# Thus below we disable stripping of target libraries and allow
+		# stripping hosts executables.
+		dostrip -x "/usr/$(get_libdir)/$(cross)${GHC_P}"
+		dostrip    "/usr/$(get_libdir)/$(cross)${GHC_P}/bin"
+	fi
+}
+
+pkg_preinst() {
+	# have we got an earlier version of ghc installed?
+	if has_version "<${CATEGORY}/${PF}"; then
+		haskell_updater_warn="1"
+	fi
+}
+
+pkg_postinst() {
+	ghc-reregister
+
+	# path to the package.cache
+	PKGCACHE="${EROOT}/usr/$(get_libdir)/$(cross)${GHC_P}/package.conf.d/package.cache"
+
+	# give the cache a new timestamp, it must be as recent as
+	# the package.conf.d directory.
+	touch "${PKGCACHE}"
+
+	if [[ "${haskell_updater_warn}" == "1" ]]; then
+		ewarn
+		ewarn "\e[1;31m************************************************************************\e[0m"
+		ewarn
+		ewarn "You have just upgraded from an older version of GHC."
+		ewarn "You may have to run"
+		ewarn "      'haskell-updater'"
+		ewarn "to rebuild all ghc-based Haskell libraries."
+		ewarn
+		ewarn "\e[1;31m************************************************************************\e[0m"
+		ewarn
+	fi
+}
+
+pkg_prerm() {
+	PKGCACHE="${EROOT}/usr/$(get_libdir)/$(cross)${GHC_P}/package.conf.d/package.cache"
+	rm -rf "${PKGCACHE}"
+
+	cp -p "${PKGCACHE}"{.shipped,}
+}
+
+pkg_postrm() {
+	ghc-package_pkg_postrm
+}