summaryrefslogtreecommitdiff
blob: 719778ce02fe46bb4f13dae30427635575172e68 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
# Copyright 1999-2015 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$

EAPI=5

# to make make a crosscompiler use crossdev and symlink ghc tree into
# cross overlay. result would look like 'cross-sparc-unknown-linux-gnu/ghc'
#
# 'CTARGET' definition and 'is_crosscompile' are taken from 'toolchain.eclass'
export CTARGET=${CTARGET:-${CHOST}}
if [[ ${CTARGET} = ${CHOST} ]] ; then
	if [[ ${CATEGORY/cross-} != ${CATEGORY} ]] ; then
		export CTARGET=${CATEGORY/cross-}
	fi
fi

inherit autotools bash-completion-r1 eutils flag-o-matic ghc-package
inherit multilib pax-utils toolchain-funcs versionator

DESCRIPTION="The Glasgow Haskell Compiler"
HOMEPAGE="http://www.haskell.org/ghc/"

# we don't have any binaries yet
arch_binaries=""

# sorted!
#arch_binaries="$arch_binaries alpha? ( http://code.haskell.org/~slyfox/ghc-alpha/ghc-bin-${PV}-alpha.tbz2 )"
#arch_binaries="$arch_binaries arm? ( http://code.haskell.org/~slyfox/ghc-arm/ghc-bin-${PV}-arm.tbz2 )"
arch_binaries="$arch_binaries amd64? ( http://code.haskell.org/~slyfox/ghc-amd64/ghc-bin-${PV}-amd64.tbz2 )"
#arch_binaries="$arch_binaries ia64?  ( http://code.haskell.org/~slyfox/ghc-ia64/ghc-bin-${PV}-ia64-fixed-fiw.tbz2 )"
#arch_binaries="$arch_binaries ppc? ( http://code.haskell.org/~slyfox/ghc-ppc/ghc-bin-${PV}-ppc.tbz2 )"
#arch_binaries="$arch_binaries ppc64? ( http://code.haskell.org/~slyfox/ghc-ppc64/ghc-bin-${PV}-ppc64.tbz2 )"
#arch_binaries="$arch_binaries sparc? ( http://code.haskell.org/~slyfox/ghc-sparc/ghc-bin-${PV}-sparc.tbz2 )"
arch_binaries="$arch_binaries x86? ( http://code.haskell.org/~slyfox/ghc-x86/ghc-bin-${PV}-x86.tbz2 )"

# various ports:
#arch_binaries="$arch_binaries x86-fbsd? ( http://code.haskell.org/~slyfox/ghc-x86-fbsd/ghc-bin-${PV}-x86-fbsd.tbz2 )"

# 0 - yet
yet_binary() {
	case "${ARCH}" in
		#alpha) return 0 ;;
		#arm)
		#	ewarn "ARM binary is built on armv5tel-eabi toolchain. Use with caution."
		#	return 0
		#;;
		amd64) return 0 ;;
		#ia64) return 0 ;;
		#ppc) return 0 ;;
		#ppc64) return 0 ;;
		#sparc) return 0 ;;
		x86) return 0 ;;
		*) return 1 ;;
	esac
}

GHC_PV=${PV}
#GHC_PV=7.10.1.20150630 # uncomment only for -rc ebuilds
GHC_P=${PN}-${GHC_PV} # using ${P} is almost never correct

#SRC_URI="!binary? ( http://downloads.haskell.org/~ghc/${PV/_rc/-rc}/${GHC_P}-src.tar.bz2 )"
# Upstream tarball was repackaged and inplace-updated. CDN cached old version for
# many users
SRC_URI="!binary? ( https://dev.gentoo.org/~slyfox/distfiles/${GHC_P}-src.tar.bz2 )"
S="${WORKDIR}"/${GHC_P}

[[ -n $arch_binaries ]] && SRC_URI+=" !ghcbootstrap? ( $arch_binaries )"

BUMP_LIBRARIES=(
	# "hackage-name          hackage-version"
	"binary                  0.7.5.0"
	"hoopl                   3.10.1.0"
	"transformers            0.4.3.0"
)

LICENSE="BSD"
SLOT="0/${PV}"
KEYWORDS="~amd64 ~x86 ~amd64-linux ~x86-linux"
IUSE="doc ghcbootstrap ghcmakebinary +gmp"
IUSE+=" binary"
IUSE+=" elibc_glibc" # system stuff

RDEPEND="
	>=dev-lang/perl-5.6.1
	>=dev-libs/gmp-5:=
	sys-libs/ncurses:=[unicode]
	!ghcmakebinary? ( virtual/libffi:= )
	!kernel_Darwin? ( >=sys-devel/gcc-2.95.3:* )
	kernel_linux? ( >=sys-devel/binutils-2.17:* )
	kernel_SunOS? ( >=sys-devel/binutils-2.17:* )
"

# force dependency on >=gmp-5, even if >=gmp-4.1 would be enough. this is due to
# that we want the binaries to use the latest versioun available, and not to be
# built against gmp-4

# similar for glibc. we have bootstrapped binaries against glibc-2.17
DEPEND="${RDEPEND}
	doc? ( app-text/docbook-xml-dtd:4.2
		app-text/docbook-xml-dtd:4.5
		app-text/docbook-xsl-stylesheets
		>=dev-libs/libxslt-1.1.2 )
	!ghcbootstrap? ( !prefix? ( elibc_glibc? ( >=sys-libs/glibc-2.17 ) ) )"

PDEPEND="!ghcbootstrap? ( =app-admin/haskell-updater-1.2* )"

REQUIRED_USE="?? ( ghcbootstrap binary )"

# haskell libraries built with cabal in configure mode, #515354
QA_CONFIGURE_OPTIONS+=" --with-compiler --with-gcc"

is_crosscompile() {
	[[ ${CHOST} != ${CTARGET} ]]
}

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+=" mirror://hackage/package/${pn}/${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() {
	if is_crosscompile; 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}"
		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

	# hardened-gcc needs to be disabled, because the mangler doesn't accept
	# its output.
	gcc-specs-pie && append-ghc-cflags persistent compile link -nopie
	gcc-specs-ssp && append-ghc-cflags persistent compile      -fno-stack-protector

	# prevent from failind building unregisterised ghc:
	# http://www.mail-archive.com/debian-bugs-dist@lists.debian.org/msg171602.html
	use ppc64 && append-ghc-cflags persistent compile -mminimal-toc
	# fix the similar issue as ppc64 TOC on ia64. ia64 has limited size of small data
	# currently ghc fails to build haddock
	# http://osdir.com/ml/gnu.binutils.bugs/2004-10/msg00050.html
	use ia64 && append-ghc-cflags persistent compile -G0
}

# 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

	# 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_PV}-orig"
	cp "${WORKDIR}/usr/bin/ghc-pkg-${GHC_PV}" "$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_PV}" \
			"${WORKDIR}/usr/bin/ghci-${GHC_PV}" \
			"${WORKDIR}/usr/bin/ghc-pkg-${GHC_PV}" \
			"${WORKDIR}/usr/bin/hsc2hs" \
			"${WORKDIR}/usr/bin/runghc-${GHC_PV}" \
			"$gp_back" \
			"${WORKDIR}/usr/$(get_libdir)/${GHC_P}/package.conf.d/"*
	fi

	# Relocate from /usr to ${EPREFIX}/usr
	relocate_path "/usr" "${to}/usr" \
		"${WORKDIR}/usr/bin/ghc-${GHC_PV}" \
		"${WORKDIR}/usr/bin/ghci-${GHC_PV}" \
		"${WORKDIR}/usr/bin/ghc-pkg-${GHC_PV}" \
		"${WORKDIR}/usr/bin/hsc2hs" \
		"${WORKDIR}/usr/bin/runghc-${GHC_PV}" \
		"${WORKDIR}/usr/$(get_libdir)/${GHC_P}/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
		# and insert LD_LIBRARY_PATH entry to EPREFIX dir tree
		# TODO: add the same for darwin's CHOST and it's DYLD_
		local new_ldpath='LD_LIBRARY_PATH="'${EPREFIX}/$(get_libdir):${EPREFIX}/usr/$(get_libdir)'${LD_LIBRARY_PATH:+:}${LD_LIBRARY_PATH}"\nexport LD_LIBRARY_PATH'
		sed -i -e '2i'"$new_ldpath" \
			"${WORKDIR}/usr/bin/ghc-${GHC_PV}" \
			"${WORKDIR}/usr/bin/ghci-${GHC_PV}" \
			"${WORKDIR}/usr/bin/ghc-pkg-${GHC_PV}" \
			"${WORKDIR}/usr/bin/hsc2hs" \
			"${WORKDIR}/usr/bin/runghc-${GHC_PV}" \
			"$gp_back" \
			"${WORKDIR}/usr/bin/hsc2hs" \
			|| die "Adding LD_LIBRARY_PATH for wrappers failed"
	fi

	# regenerate the binary package cache
	"$gp_back" recache || die "failed to update cache after relocation"
	rm "$gp_back"
}

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 $(type -P ghc) ]] && \
			die "Could not find a ghc to bootstrap with."
	else
		if ! yet_binary; then
			eerror "Please try emerging with USE=ghcbootstrap and report build"
			eerror "sucess or failure to the haskell team (haskell@gentoo.org)"
			die "No binary available for '${ARCH}' arch yet, USE=ghcbootstrap"
		fi
	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.bz2  ;;
	esac
	unpack ${ONLYA}

	if [[ -d "${S}"/libraries/dph ]]; then
		# Sometimes dph libs get accidentally shipped with ghc
		# but they are not installed unless user requests it.
		# We never install them.
		elog "Removing 'libraries/dph'"
		rm -rf "${S}"/libraries/dph
	fi
}

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-${GHC_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)/${GHC_P}/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}"
	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
				# much 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 epatch will break

		epatch "${FILESDIR}"/${PN}-7.0.4-CHOST-prefix.patch

		epatch "${FILESDIR}"/${PN}-7.8.2-cgen-constify.patch
		epatch "${FILESDIR}"/${PN}-7.8.3-prim-lm.patch
		epatch "${FILESDIR}"/${PN}-7.10.1-rc3-ghc-7.10-bootstrap.patch
		epatch "${FILESDIR}"/${PN}-7.10.1-T10590-dequeue.patch
		# Since ${S}/packages does not include base, etc. add them to gen_contents_index
		sed -e 's@\(for REPO in .*\)@\1 base integer-gmp integer-gmp2 integer-simple template-haskell@' \
			-i libraries/gen_contents_index || die

		if use prefix; then
			# Make configure find docbook-xsl-stylesheets from Prefix
			sed -e '/^FP_DIR_DOCBOOK_XSL/s:\[.*\]:['"${EPREFIX}"'/usr/share/sgml/docbook/xsl-stylesheets/]:' \
				-i utils/haddock/doc/configure.ac || die
		fi

		bump_libs

		# 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 = ${EPREFIX}/usr/share/doc/${P}" >> mk/build.mk
		echo "htmldir = ${EPREFIX}/usr/share/doc/${P}" >> 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

		# 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_DOCBOOK_PDF  = NO"  >> mk/build.mk
		echo "BUILD_DOCBOOK_PS   = NO"  >> mk/build.mk
		if use doc; then
			echo "BUILD_DOCBOOK_HTML = YES" >> mk/build.mk
		else
			echo "BUILD_DOCBOOK_HTML = NO" >> mk/build.mk
		fi

		# this controls presence on 'xhtml' and 'haddock' in final install
		echo "HADDOCK_DOCS       = YES" >> mk/build.mk

		# 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

		# 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

		if use gmp; then
			echo "INTEGER_LIBRARY=integer-gmp2" >> mk/build.mk
		else
			echo "INTEGER_LIBRARY=integer-simple" >> mk/build.mk
		fi

		# don't strip anything. Very useful when stage2 SIGSEGVs on you
		echo "STRIP_CMD = :" >> mk/build.mk

		elog "Final mk/build.mk:"
		cat mk/build.mk || die

		local econf_args=()

		# GHC embeds 'gcc' 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.
		is_crosscompile || econf_args+=(--with-gcc=${CHOST}-gcc)

		if ! use ghcmakebinary; then
			econf_args+=(--with-system-libffi)
			econf_args+=(--with-ffi-includes=$(pkg-config libffi --cflags-only-I | sed -e 's@^-I@@'))
		fi

		econf ${econf_args[@]} --enable-bootstrap-with-devel-snapshot

		if [[ ${PV} == *9999* ]]; then
			GHC_PV="$(grep 'S\[\"PACKAGE_VERSION\"\]' config.status | sed -e 's@^.*=\"\(.*\)\"@\1@')"
			GHC_P=${PN}-${GHC_PV}
		fi
		GHC_TPF="$(grep 'S\[\"TargetPlatformFull\"\]' config.status | sed -e 's@^.*=\"\(.*\)\"@\1@')"
	fi # ! use binary
}

src_compile() {
	if ! use binary; then
		# 1. build compiler binary first
		emake ghc/stage2/build/tmp/ghc-stage2
		# 2. pax-mark (bug #516430)
		pax-mark -m ghc/stage2/build/tmp/ghc-stage2
		# 3. and then all the rest
		emake all
	fi # ! use binary
}

src_install() {
	if use binary; then
		use prefix && mkdir -p "${ED}"
		mv "${S}/usr" "${ED}"
	else

		emake -j1 install DESTDIR="${D}"
		dodoc "distrib/README" "ANNOUNCE" "LICENSE" "VERSION"

		# 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)/${GHC_P}/package.conf.d"
		for shipped_conf in "${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/haddock

		if [[ ! -f "${S}/VERSION" ]]; then
			echo "${GHC_PV}" > "${S}/VERSION" \
				|| die "Could not create file ${S}/VERSION"
		fi
		newbashcomp "${FILESDIR}"/ghc-bash-completion ghc-pkg
		newbashcomp utils/completion/ghc.bash         ghc
	fi

	# path to the package.cache
	local package_confdir="${ED}/usr/$(get_libdir)/${GHC_P}/package.conf.d"
	PKGCACHE="${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"
}

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)/${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)/${GHC_P}/package.conf.d/package.cache"
	rm -rf "${PKGCACHE}"

	cp -p "${PKGCACHE}"{.shipped,}
}

pkg_postrm() {
	ghc-package_pkg_postrm
}