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Revision 1.43 - (show annotations) (download)
Tue Feb 11 19:00:06 2014 UTC (2 months ago) by slyfox
Branch: MAIN
CVS Tags: HEAD
Changes since 1.42: +40 -19 lines
Add support for parallel building (ghc-7.8+). Disable dynamic library stripping and respect --sysconfdir (Cabal-1.18+).

1 # Copyright 1999-2014 Gentoo Foundation
2 # Distributed under the terms of the GNU General Public License v2
3 # $Header: /var/cvsroot/gentoo-x86/eclass/haskell-cabal.eclass,v 1.42 2013/11/20 09:19:19 slyfox Exp $
4
5 # @ECLASS: haskell-cabal.eclass
6 # @MAINTAINER:
7 # Haskell herd <haskell@gentoo.org>
8 # @AUTHOR:
9 # Original author: Andres Loeh <kosmikus@gentoo.org>
10 # Original author: Duncan Coutts <dcoutts@gentoo.org>
11 # @BLURB: for packages that make use of the Haskell Common Architecture for Building Applications and Libraries (cabal)
12 # @DESCRIPTION:
13 # Basic instructions:
14 #
15 # Before inheriting the eclass, set CABAL_FEATURES to
16 # reflect the tools and features that the package makes
17 # use of.
18 #
19 # Currently supported features:
20 # haddock -- for documentation generation
21 # hscolour -- generation of colourised sources
22 # hoogle -- generation of documentation search index
23 # alex -- lexer/scanner generator
24 # happy -- parser generator
25 # c2hs -- C interface generator
26 # cpphs -- C preprocessor clone written in Haskell
27 # profile -- if package supports to build profiling-enabled libraries
28 # bootstrap -- only used for the cabal package itself
29 # bin -- the package installs binaries
30 # lib -- the package installs libraries
31 # nocabaldep -- don't add dependency on cabal.
32 # only used for packages that _must_ not pull the dependency
33 # on cabal, but still use this eclass (e.g. haskell-updater).
34 # test-suite -- add support for cabal test-suites (introduced in Cabal-1.8)
35
36 inherit eutils ghc-package multilib multiprocessing
37
38 # @ECLASS-VARIABLE: CABAL_EXTRA_CONFIGURE_FLAGS
39 # @DESCRIPTION:
40 # User-specified additional parameters passed to 'setup configure'.
41 # example: /etc/portage/make.conf: CABAL_EXTRA_CONFIGURE_FLAGS=--enable-shared
42 : ${CABAL_EXTRA_CONFIGURE_FLAGS:=}
43
44 # @ECLASS-VARIABLE: CABAL_EXTRA_BUILD_FLAGS
45 # @DESCRIPTION:
46 # User-specified additional parameters passed to 'setup build'.
47 # example: /etc/portage/make.conf: CABAL_EXTRA_BUILD_FLAGS=-v
48 : ${CABAL_EXTRA_BUILD_FLAGS:=}
49
50 # @ECLASS-VARIABLE: GHC_BOOTSTRAP_FLAGS
51 # @DESCRIPTION:
52 # User-specified additional parameters for ghc when building
53 # _only_ 'setup' binary bootstrap.
54 # example: /etc/portage/make.conf: GHC_BOOTSTRAP_FLAGS=-dynamic to make
55 # linking 'setup' faster.
56 : ${GHC_BOOTSTRAP_FLAGS:=}
57
58 # @ECLASS-VARIABLE: CABAL_DEBUG_LOOSENING
59 # @DESCRIPTION:
60 # Show debug output for 'cabal_chdeps' function if set.
61 # Needs working 'diff'.
62 : ${CABAL_DEBUG_LOOSENING:=}
63
64 HASKELL_CABAL_EXPF="pkg_setup src_compile src_test src_install"
65
66 case "${EAPI:-0}" in
67 2|3|4|5) HASKELL_CABAL_EXPF+=" src_configure" ;;
68 *) ;;
69 esac
70
71 EXPORT_FUNCTIONS ${HASKELL_CABAL_EXPF}
72
73 for feature in ${CABAL_FEATURES}; do
74 case ${feature} in
75 haddock) CABAL_USE_HADDOCK=yes;;
76 hscolour) CABAL_USE_HSCOLOUR=yes;;
77 hoogle) CABAL_USE_HOOGLE=yes;;
78 alex) CABAL_USE_ALEX=yes;;
79 happy) CABAL_USE_HAPPY=yes;;
80 c2hs) CABAL_USE_C2HS=yes;;
81 cpphs) CABAL_USE_CPPHS=yes;;
82 profile) CABAL_USE_PROFILE=yes;;
83 bootstrap) CABAL_BOOTSTRAP=yes;;
84 bin) CABAL_HAS_BINARIES=yes;;
85 lib) CABAL_HAS_LIBRARIES=yes;;
86 nocabaldep) CABAL_FROM_GHC=yes;;
87 test-suite) CABAL_TEST_SUITE=yes;;
88 *) CABAL_UNKNOWN="${CABAL_UNKNOWN} ${feature}";;
89 esac
90 done
91
92 if [[ -n "${CABAL_USE_HADDOCK}" ]]; then
93 IUSE="${IUSE} doc"
94 # don't require depend on itself to build docs.
95 # ebuild bootstraps docs from just built binary
96 [[ ${CATEGORY}/${PN} = "dev-haskell/haddock" ]] || DEPEND="${DEPEND} doc? ( dev-haskell/haddock )"
97 fi
98
99 if [[ -n "${CABAL_USE_HSCOLOUR}" ]]; then
100 IUSE="${IUSE} hscolour"
101 DEPEND="${DEPEND} hscolour? ( dev-haskell/hscolour )"
102 fi
103
104 if [[ -n "${CABAL_USE_ALEX}" ]]; then
105 DEPEND="${DEPEND} dev-haskell/alex"
106 fi
107
108 if [[ -n "${CABAL_USE_HAPPY}" ]]; then
109 DEPEND="${DEPEND} dev-haskell/happy"
110 fi
111
112 if [[ -n "${CABAL_USE_C2HS}" ]]; then
113 DEPEND="${DEPEND} dev-haskell/c2hs"
114 fi
115
116 if [[ -n "${CABAL_USE_CPPHS}" ]]; then
117 DEPEND="${DEPEND} dev-haskell/cpphs"
118 fi
119
120 if [[ -n "${CABAL_USE_PROFILE}" ]]; then
121 IUSE="${IUSE} profile"
122 fi
123
124 if [[ -n "${CABAL_TEST_SUITE}" ]]; then
125 IUSE="${IUSE} test"
126 fi
127
128 # We always use a standalone version of Cabal, rather than the one that comes
129 # with GHC. But of course we can't depend on cabal when building cabal itself.
130 if [[ -z ${CABAL_MIN_VERSION} ]]; then
131 CABAL_MIN_VERSION=1.1.4
132 fi
133 if [[ -z "${CABAL_BOOTSTRAP}" && -z "${CABAL_FROM_GHC}" ]]; then
134 DEPEND="${DEPEND} >=dev-haskell/cabal-${CABAL_MIN_VERSION}"
135 fi
136
137 # returns the version of cabal currently in use
138 _CABAL_VERSION_CACHE=""
139 cabal-version() {
140 if [[ -z "${_CABAL_VERSION_CACHE}" ]]; then
141 if [[ "${CABAL_BOOTSTRAP}" ]]; then
142 # We're bootstrapping cabal, so the cabal version is the version
143 # of this package itself.
144 _CABAL_VERSION_CACHE="${PV}"
145 elif [[ "${CABAL_FROM_GHC}" ]]; then
146 local cabal_package=$(echo "$(ghc-libdir)"/Cabal-*)
147 # /path/to/ghc/Cabal-${VER} -> ${VER}
148 _CABAL_VERSION_CACHE="${cabal_package/*Cabal-/}"
149 else
150 # We ask portage, not ghc, so that we only pick up
151 # portage-installed cabal versions.
152 _CABAL_VERSION_CACHE="$(ghc-extractportageversion dev-haskell/cabal)"
153 fi
154 fi
155 echo "${_CABAL_VERSION_CACHE}"
156 }
157
158 cabal-bootstrap() {
159 local setupmodule
160 local cabalpackage
161 if [[ -f "${S}/Setup.lhs" ]]; then
162 setupmodule="${S}/Setup.lhs"
163 elif [[ -f "${S}/Setup.hs" ]]; then
164 setupmodule="${S}/Setup.hs"
165 else
166 die "No Setup.lhs or Setup.hs found"
167 fi
168
169 if [[ -z "${CABAL_BOOTSTRAP}" && -z "${CABAL_FROM_GHC}" ]] && ! ghc-sanecabal "${CABAL_MIN_VERSION}"; then
170 eerror "The package dev-haskell/cabal is not correctly installed for"
171 eerror "the currently active version of ghc ($(ghc-version)). Please"
172 eerror "run haskell-updater or re-build dev-haskell/cabal."
173 die "cabal is not correctly installed"
174 fi
175
176 # We build the setup program using the latest version of
177 # cabal that we have installed
178 cabalpackage=Cabal-$(cabal-version)
179 einfo "Using cabal-$(cabal-version)."
180
181 make_setup() {
182 set -- -package "${cabalpackage}" --make "${setupmodule}" \
183 ${GHC_BOOTSTRAP_FLAGS} \
184 "$@" \
185 -o setup
186 echo $(ghc-getghc) ${HCFLAGS} "$@"
187 $(ghc-getghc) "$@"
188 }
189 if $(ghc-supports-shared-libraries); then
190 # # some custom build systems might use external libraries,
191 # # for which we don't have shared libs, so keep static fallback
192 # bug #411789, http://hackage.haskell.org/trac/ghc/ticket/5743#comment:3
193 # http://hackage.haskell.org/trac/ghc/ticket/7062
194 # http://hackage.haskell.org/trac/ghc/ticket/3072
195 # ghc does not set RPATH for extralibs, thus we do it ourselves by hands
196 einfo "Prepending $(ghc-libdir) to LD_LIBRARY_PATH"
197 if [[ ${CHOST} != *-darwin* ]]; then
198 LD_LIBRARY_PATH="$(ghc-libdir)${LD_LIBRARY_PATH:+:}${LD_LIBRARY_PATH}"
199 export LD_LIBRARY_PATH
200 else
201 DYLD_LIBRARY_PATH="$(ghc-libdir)${DYLD_LIBRARY_PATH:+:}${DYLD_LIBRARY_PATH}"
202 export DYLD_LIBRARY_PATH
203 fi
204 { make_setup -dynamic "$@" && ./setup --help >/dev/null; } ||
205 make_setup "$@" || die "compiling ${setupmodule} failed"
206 else
207 make_setup "$@" || die "compiling ${setupmodule} failed"
208 fi
209 }
210
211 cabal-mksetup() {
212 local setupdir
213
214 if [[ -n $1 ]]; then
215 setupdir=$1
216 else
217 setupdir=${S}
218 fi
219
220 rm -f "${setupdir}"/Setup.{lhs,hs}
221
222 echo 'import Distribution.Simple; main = defaultMainWithHooks defaultUserHooks' \
223 > $setupdir/Setup.hs || die "failed to create default Setup.hs"
224 }
225
226 cabal-hscolour() {
227 set -- hscolour "$@"
228 echo ./setup "$@"
229 ./setup "$@" || die "setup hscolour failed"
230 }
231
232 cabal-haddock() {
233 set -- haddock "$@"
234 echo ./setup "$@"
235 ./setup "$@" || die "setup haddock failed"
236 }
237
238 cabal-hscolour-haddock() {
239 # --hyperlink-source implies calling 'setup hscolour'
240 set -- haddock --hyperlink-source
241 echo ./setup "$@"
242 ./setup "$@" --hyperlink-source || die "setup haddock --hyperlink-source failed"
243 }
244
245 cabal-die-if-nonempty() {
246 local breakage_type=$1
247 shift
248
249 [[ "${#@}" == 0 ]] && return 0
250 eerror "Detected ${breakage_type} packages: ${@}"
251 die "//==-- Please, run 'haskell-updater' to fix ${breakage_type} packages --==//"
252 }
253
254 cabal-show-brokens() {
255 # pretty-printer
256 $(ghc-getghcpkg) check 2>&1 \
257 | egrep -v '^Warning: haddock-(html|interfaces): ' \
258 | egrep -v '^Warning: include-dirs: '
259
260 cabal-die-if-nonempty 'broken' \
261 $($(ghc-getghcpkg) check --simple-output)
262 }
263
264 cabal-show-old() {
265 cabal-die-if-nonempty 'outdated' \
266 $("${EPREFIX}"/usr/sbin/haskell-updater --quiet --upgrade --list-only)
267 }
268
269 cabal-show-brokens-and-die() {
270 cabal-show-brokens
271 cabal-show-old
272
273 die "$@"
274 }
275
276 cabal-configure() {
277 local cabalconf=()
278 has "${EAPI:-0}" 0 1 2 && ! use prefix && EPREFIX=
279
280 if [[ -n "${CABAL_USE_HADDOCK}" ]] && use doc; then
281 cabalconf+=(--with-haddock=${EPREFIX}/usr/bin/haddock)
282 fi
283 if [[ -n "${CABAL_USE_PROFILE}" ]] && use profile; then
284 cabalconf+=(--enable-library-profiling)
285 fi
286 if [[ -n "${CABAL_USE_ALEX}" ]]; then
287 cabalconf+=(--with-alex=${EPREFIX}/usr/bin/alex)
288 fi
289
290 if [[ -n "${CABAL_USE_HAPPY}" ]]; then
291 cabalconf+=(--with-happy=${EPREFIX}/usr/bin/happy)
292 fi
293
294 if [[ -n "${CABAL_USE_C2HS}" ]]; then
295 cabalconf+=(--with-c2hs=${EPREFIX}/usr/bin/c2hs)
296 fi
297 if [[ -n "${CABAL_USE_CPPHS}" ]]; then
298 cabalconf+=(--with-cpphs=${EPREFIX}/usr/bin/cpphs)
299 fi
300 if [[ -n "${CABAL_TEST_SUITE}" ]]; then
301 cabalconf+=($(use_enable test tests))
302 fi
303
304 local option
305 for option in ${HCFLAGS}
306 do
307 cabalconf+=(--ghc-option="$option")
308 done
309
310 # parallel on all available cores
311 if ghc-supports-parallel-make; then
312 local max_jobs=$(makeopts_jobs)
313
314 # limit to sort-of-sane value (same as Cabal)
315 [[ ${max_jobs} -gt 64 ]] && max_jobs=64
316
317 cabalconf+=(--ghc-option=-j"$max_jobs")
318 fi
319
320 # Building GHCi libs on ppc64 causes "TOC overflow".
321 if use ppc64; then
322 cabalconf+=(--disable-library-for-ghci)
323 fi
324
325 # currently cabal does not respect CFLAGS and LDFLAGS on it's own (bug #333217)
326 # so translate LDFLAGS to ghc parameters (without filtering)
327 local flag
328 for flag in $LDFLAGS; do cabalconf+=(--ghc-option="-optl$flag"); done
329
330 # disable executable stripping for the executables, as portage will
331 # strip by itself, and pre-stripping gives a QA warning.
332 # cabal versions previous to 1.4 does not strip executables, and does
333 # not accept the flag.
334 # this fixes numerous bugs, amongst them;
335 # bug #251881, bug #251882, bug #251884, bug #251886, bug #299494
336 cabalconf+=(--disable-executable-stripping)
337
338 cabalconf+=(--docdir="${EPREFIX}"/usr/share/doc/${PF})
339 # As of Cabal 1.2, configure is quite quiet. For diagnostic purposes
340 # it's better if the configure chatter is in the build logs:
341 cabalconf+=(--verbose)
342
343 # We build shared version of our Cabal where ghc ships it's shared
344 # version of it. We will link ./setup as dynamic binary againt Cabal later.
345 [[ ${CATEGORY}/${PN} == "dev-haskell/cabal" ]] && \
346 $(ghc-supports-shared-libraries) && \
347 cabalconf+=(--enable-shared)
348
349 if $(ghc-supports-shared-libraries); then
350 # maybe a bit lower
351 if $(ghc-supports-dynamic-by-default); then
352 cabalconf+=(--enable-shared)
353 fi
354 fi
355
356 # --sysconfdir appeared in Cabal-1.18+
357 if ./setup configure --help | grep -q -- --sysconfdir; then
358 cabalconf+=(--sysconfdir="${EPREFIX}"/etc)
359 fi
360
361 # appeared in Cabal-1.18+ (see '--disable-executable-stripping')
362 if ./setup configure --help | grep -q -- --disable-library-stripping; then
363 cabalconf+=(--disable-library-stripping)
364 fi
365
366 set -- configure \
367 --ghc --prefix="${EPREFIX}"/usr \
368 --with-compiler="$(ghc-getghc)" \
369 --with-hc-pkg="$(ghc-getghcpkg)" \
370 --prefix="${EPREFIX}"/usr \
371 --libdir="${EPREFIX}"/usr/$(get_libdir) \
372 --libsubdir=${P}/ghc-$(ghc-version) \
373 --datadir="${EPREFIX}"/usr/share/ \
374 --datasubdir=${P}/ghc-$(ghc-version) \
375 "${cabalconf[@]}" \
376 ${CABAL_CONFIGURE_FLAGS} \
377 ${CABAL_EXTRA_CONFIGURE_FLAGS} \
378 "$@"
379 echo ./setup "$@"
380 ./setup "$@" || cabal-show-brokens-and-die "setup configure failed"
381 }
382
383 cabal-build() {
384 unset LANG LC_ALL LC_MESSAGES
385 set -- build ${CABAL_EXTRA_BUILD_FLAGS} "$@"
386 echo ./setup "$@"
387 ./setup "$@" \
388 || die "setup build failed"
389 }
390
391 cabal-copy() {
392 has "${EAPI:-0}" 0 1 2 && ! use prefix && ED=${D}
393
394 set -- copy --destdir="${D}" "$@"
395 echo ./setup "$@"
396 ./setup "$@" || die "setup copy failed"
397
398 # cabal is a bit eager about creating dirs,
399 # so remove them if they are empty
400 rmdir "${ED}/usr/bin" 2> /dev/null
401 }
402
403 cabal-pkg() {
404 # This does not actually register since we're using true instead
405 # of ghc-pkg. So it just leaves the .conf file and we can
406 # register that ourselves (if it exists).
407
408 if [[ -n ${CABAL_HAS_LIBRARIES} ]]; then
409 # Newer cabal can generate a package conf for us:
410 ./setup register --gen-pkg-config="${T}/${P}.conf"
411 ghc-setup-pkg "${T}/${P}.conf"
412 ghc-install-pkg
413 fi
414 }
415
416 # Some cabal libs are bundled along with some versions of ghc
417 # eg filepath-1.0 comes with ghc-6.6.1
418 # by putting CABAL_CORE_LIB_GHC_PV="6.6.1" in an ebuild we are declaring that
419 # when building with this version of ghc, the ebuild is a dummy that is it will
420 # install no files since the package is already included with ghc.
421 # However portage still records the dependency and we can upgrade the package
422 # to a later one that's not included with ghc.
423 # You can also put a space separated list, eg CABAL_CORE_LIB_GHC_PV="6.6 6.6.1".
424 cabal-is-dummy-lib() {
425 for version in ${CABAL_CORE_LIB_GHC_PV[*]}; do
426 [[ "$(ghc-version)" == ${version} ]] && return 0
427 done
428 return 1
429 }
430
431 # exported function: check if cabal is correctly installed for
432 # the currently active ghc (we cannot guarantee this with portage)
433 haskell-cabal_pkg_setup() {
434 if [[ -n ${CABAL_HAS_LIBRARIES} ]]; then
435 [[ ${RDEPEND} == *dev-lang/ghc* ]] || eqawarn "QA Notice: A library does not have runtime dependency on dev-lang/ghc."
436 fi
437 if [[ -z "${CABAL_HAS_BINARIES}" ]] && [[ -z "${CABAL_HAS_LIBRARIES}" ]]; then
438 eqawarn "QA Notice: Neither bin nor lib are in CABAL_FEATURES."
439 fi
440 if [[ -n "${CABAL_UNKNOWN}" ]]; then
441 eqawarn "QA Notice: Unknown entry in CABAL_FEATURES: ${CABAL_UNKNOWN}"
442 fi
443 if cabal-is-dummy-lib; then
444 einfo "${P} is included in ghc-${CABAL_CORE_LIB_GHC_PV}, nothing to install."
445 fi
446 }
447
448 haskell-cabal_src_configure() {
449 cabal-is-dummy-lib && return
450
451 pushd "${S}" > /dev/null
452
453 cabal-bootstrap
454
455 cabal-configure "$@"
456
457 popd > /dev/null
458 }
459
460 # exported function: nice alias
461 cabal_src_configure() {
462 haskell-cabal_src_configure "$@"
463 }
464
465 # exported function: cabal-style bootstrap configure and compile
466 cabal_src_compile() {
467 # it's a common mistake when one bumps ebuild to EAPI="2" (and upper)
468 # and forgets to separate src_compile() to src_configure()/src_compile().
469 # Such error leads to default src_configure and we lose all passed flags.
470 if ! has "${EAPI:-0}" 0 1; then
471 local passed_flag
472 for passed_flag in "$@"; do
473 [[ ${passed_flag} == --flags=* ]] && \
474 eqawarn "QA Notice: Cabal option '${passed_flag}' has effect only in src_configure()"
475 done
476 fi
477
478 cabal-is-dummy-lib && return
479
480 has src_configure ${HASKELL_CABAL_EXPF} || haskell-cabal_src_configure "$@"
481 cabal-build
482
483 if [[ -n "${CABAL_USE_HADDOCK}" ]] && use doc; then
484 if [[ -n "${CABAL_USE_HSCOLOUR}" ]] && use hscolour; then
485 # hscolour and haddock
486 cabal-hscolour-haddock
487 else
488 # just haddock
489 cabal-haddock
490 fi
491 else
492 if [[ -n "${CABAL_USE_HSCOLOUR}" ]] && use hscolour; then
493 # just hscolour
494 cabal-hscolour
495 fi
496 fi
497 }
498
499 haskell-cabal_src_compile() {
500 pushd "${S}" > /dev/null
501
502 cabal_src_compile "$@"
503
504 popd > /dev/null
505 }
506
507 haskell-cabal_src_test() {
508 pushd "${S}" > /dev/null
509
510 if cabal-is-dummy-lib; then
511 einfo ">>> No tests for dummy library: ${CATEGORY}/${PF}"
512 else
513 einfo ">>> Test phase [cabal test]: ${CATEGORY}/${PF}"
514 set -- test "$@"
515 echo ./setup "$@"
516 ./setup "$@" || die "cabal test failed"
517 fi
518
519 popd > /dev/null
520 }
521
522 # exported function: cabal-style copy and register
523 cabal_src_install() {
524 has "${EAPI:-0}" 0 1 2 && ! use prefix && EPREFIX=
525
526 if ! cabal-is-dummy-lib; then
527 cabal-copy
528 cabal-pkg
529 fi
530
531 # create a dummy local package conf file for haskell-updater
532 # if it does not exist (dummy libraries and binaries w/o libraries)
533 local ghc_confdir_with_prefix="$(ghc-confdir)"
534 # remove EPREFIX
535 dodir ${ghc_confdir_with_prefix#${EPREFIX}}
536 local conf_file="${D}/$(ghc-confdir)/$(ghc-localpkgconf)"
537 [[ -e $conf_file ]] || echo '[]' > "$conf_file" || die
538
539 # make sure installed packages do not destroy ghc's
540 # bundled packages
541 local initial_pkg_db=${ROOT}/$(ghc-libdir)/package.conf.d.initial
542 if [[ -e ${initial_pkg_db} ]]; then
543 local checked_pkg
544 for checked_pkg in $(ghc-listpkg "${conf_file}")
545 do
546 local initial_pkg
547 for initial_pkg in $(ghc-listpkg "${initial_pkg_db}"); do
548 if [[ ${checked_pkg} = ${initial_pkg} ]]; then
549 eerror "Package ${checked_pkg} is shipped with $(ghc-version)."
550 eerror "Ebuild author forgot CABAL_CORE_LIB_GHC_PV entry."
551 eerror "Found in ${initial_pkg_db}."
552 die
553 fi
554 done
555 done
556 fi
557 }
558
559 haskell-cabal_src_install() {
560 pushd "${S}" > /dev/null
561
562 cabal_src_install
563
564 popd > /dev/null
565 }
566
567 # @FUNCTION: cabal_flag
568 # @DESCRIPTION:
569 # ebuild.sh:use_enable() taken as base
570 #
571 # Usage examples:
572 #
573 # CABAL_CONFIGURE_FLAGS=$(cabal_flag gui)
574 # leads to "--flags=gui" or "--flags=-gui" (useflag 'gui')
575 #
576 # CABAL_CONFIGURE_FLAGS=$(cabal_flag gtk gui)
577 # also leads to "--flags=gui" or " --flags=-gui" (useflag 'gtk')
578 #
579 cabal_flag() {
580 if [[ -z "$1" ]]; then
581 echo "!!! cabal_flag() called without a parameter." >&2
582 echo "!!! cabal_flag() <USEFLAG> [<cabal_flagname>]" >&2
583 return 1
584 fi
585
586 local UWORD=${2:-$1}
587
588 if use "$1"; then
589 echo "--flags=${UWORD}"
590 else
591 echo "--flags=-${UWORD}"
592 fi
593
594 return 0
595 }
596
597 # @FUNCTION: cabal_chdeps
598 # @DESCRIPTION:
599 # Allows easier patching of $CABAL_FILE (${S}/${PN}.cabal by default)
600 # depends
601 #
602 # Accepts argument list as pairs of substitutions: <from-string> <to-string>...
603 #
604 # Dies on error.
605 #
606 # Usage examples:
607 #
608 # src_prepare() {
609 # cabal_chdeps \
610 # 'base >= 4.2 && < 4.6' 'base >= 4.2 && < 4.7' \
611 # 'containers ==0.4.*' 'containers >= 0.4 && < 0.6'
612 #}
613 # or
614 # src_prepare() {
615 # CABAL_FILE=${S}/${MY_PN}.cabal cabal_chdeps \
616 # 'base >= 4.2 && < 4.6' 'base >= 4.2 && < 4.7'
617 # CABAL_FILE=${S}/${MY_PN}-tools.cabal cabal_chdeps \
618 # 'base == 3.*' 'base >= 4.2 && < 4.7'
619 #}
620 #
621 cabal_chdeps() {
622 local cf=${CABAL_FILE:-${S}/${PN}.cabal}
623 local from_ss # ss - substring
624 local to_ss
625 local orig_c # c - contents
626 local new_c
627
628 [[ -f $cf ]] || die "cabal file '$cf' does not exist"
629
630 orig_c=$(< "$cf")
631
632 while :; do
633 from_pat=$1
634 to_str=$2
635
636 [[ -n ${from_pat} ]] || break
637 [[ -n ${to_str} ]] || die "'${from_str}' does not have 'to' part"
638
639 einfo "CHDEP: '${from_pat}' -> '${to_str}'"
640
641 # escape pattern-like symbols
642 from_pat=${from_pat//\*/\\*}
643 from_pat=${from_pat//\[/\\[}
644
645 new_c=${orig_c//${from_pat}/${to_str}}
646
647 if [[ -n $CABAL_DEBUG_LOOSENING ]]; then
648 echo "${orig_c}" >"${T}/${cf}".pre
649 echo "${new_c}" >"${T}/${cf}".post
650 diff -u "${T}/${cf}".{pre,post}
651 fi
652
653 [[ "${orig_c}" == "${new_c}" ]] && die "no trigger for '${from_pat}'"
654 orig_c=${new_c}
655 shift
656 shift
657 done
658
659 echo "${new_c}" > "$cf" ||
660 die "failed to update"
661 }
662
663 # @FUNCTION: replace-hcflags
664 # @USAGE: <old> <new>
665 # @DESCRIPTION:
666 # Replace the <old> flag with <new> in HCFLAGS. Accepts shell globs for <old>.
667 # The implementation is picked from flag-o-matic.eclass:replace-flags()
668 replace-hcflags() {
669 [[ $# != 2 ]] && die "Usage: replace-hcflags <old flag> <new flag>"
670
671 local f new=()
672 for f in ${HCFLAGS} ; do
673 # Note this should work with globs like -O*
674 if [[ ${f} == ${1} ]]; then
675 einfo "HCFLAGS: replacing '${f}' to '${2}'"
676 f=${2}
677 fi
678 new+=( "${f}" )
679 done
680 export HCFLAGS="${new[*]}"
681
682 return 0
683 }

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