aboutsummaryrefslogtreecommitdiffstats
path: root/waflib/extras/qt4.py
blob: 90cae7e0ae5550066780750aa6ae803aca912af8 (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
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
#!/usr/bin/env python
# encoding: utf-8
# Thomas Nagy, 2006-2010 (ita)

"""

Tool Description
================

This tool helps with finding Qt4 tools and libraries,
and also provides syntactic sugar for using Qt4 tools.

The following snippet illustrates the tool usage::

	def options(opt):
		opt.load('compiler_cxx qt4')

	def configure(conf):
		conf.load('compiler_cxx qt4')

	def build(bld):
		bld(
			features = 'qt4 cxx cxxprogram',
			uselib   = 'QTCORE QTGUI QTOPENGL QTSVG',
			source   = 'main.cpp textures.qrc aboutDialog.ui',
			target   = 'window',
		)

Here, the UI description and resource files will be processed
to generate code.

Usage
=====

Load the "qt4" tool.

You also need to edit your sources accordingly:

- the normal way of doing things is to have your C++ files
  include the .moc file.
  This is regarded as the best practice (and provides much faster
  compilations).
  It also implies that the include paths have beenset properly.

- to have the include paths added automatically, use the following::

     from waflib.TaskGen import feature, before_method, after_method
     @feature('cxx')
     @after_method('process_source')
     @before_method('apply_incpaths')
     def add_includes_paths(self):
        incs = set(self.to_list(getattr(self, 'includes', '')))
        for x in self.compiled_tasks:
            incs.add(x.inputs[0].parent.path_from(self.path))
        self.includes = sorted(incs)

Note: another tool provides Qt processing that does not require
.moc includes, see 'playground/slow_qt/'.

A few options (--qt{dir,bin,...}) and environment variables
(QT4_{ROOT,DIR,MOC,UIC,XCOMPILE}) allow finer tuning of the tool,
tool path selection, etc; please read the source for more info.

"""

try:
	from xml.sax import make_parser
	from xml.sax.handler import ContentHandler
except ImportError:
	has_xml = False
	ContentHandler = object
else:
	has_xml = True

import os, sys
from waflib.Tools import cxx
from waflib import Task, Utils, Options, Errors, Context
from waflib.TaskGen import feature, after_method, extension
from waflib.Configure import conf
from waflib import Logs

MOC_H = ['.h', '.hpp', '.hxx', '.hh']
"""
File extensions associated to the .moc files
"""

EXT_RCC = ['.qrc']
"""
File extension for the resource (.qrc) files
"""

EXT_UI  = ['.ui']
"""
File extension for the user interface (.ui) files
"""

EXT_QT4 = ['.cpp', '.cc', '.cxx', '.C']
"""
File extensions of C++ files that may require a .moc processing
"""

QT4_LIBS = "QtCore QtGui QtUiTools QtNetwork QtOpenGL QtSql QtSvg QtTest QtXml QtXmlPatterns QtWebKit Qt3Support QtHelp QtScript QtDeclarative QtDesigner"

class qxx(Task.classes['cxx']):
	"""
	Each C++ file can have zero or several .moc files to create.
	They are known only when the files are scanned (preprocessor)
	To avoid scanning the c++ files each time (parsing C/C++), the results
	are retrieved from the task cache (bld.node_deps/bld.raw_deps).
	The moc tasks are also created *dynamically* during the build.
	"""

	def __init__(self, *k, **kw):
		Task.Task.__init__(self, *k, **kw)
		self.moc_done = 0

	def runnable_status(self):
		"""
		Compute the task signature to make sure the scanner was executed. Create the
		moc tasks by using :py:meth:`waflib.Tools.qt4.qxx.add_moc_tasks` (if necessary),
		then postpone the task execution (there is no need to recompute the task signature).
		"""
		if self.moc_done:
			return Task.Task.runnable_status(self)
		else:
			for t in self.run_after:
				if not t.hasrun:
					return Task.ASK_LATER
			self.add_moc_tasks()
			return Task.Task.runnable_status(self)

	def create_moc_task(self, h_node, m_node):
		"""
		If several libraries use the same classes, it is possible that moc will run several times (Issue 1318)
		It is not possible to change the file names, but we can assume that the moc transformation will be identical,
		and the moc tasks can be shared in a global cache.

		The defines passed to moc will then depend on task generator order. If this is not acceptable, then
		use the tool slow_qt4 instead (and enjoy the slow builds... :-( )
		"""
		try:
			moc_cache = self.generator.bld.moc_cache
		except AttributeError:
			moc_cache = self.generator.bld.moc_cache = {}

		try:
			return moc_cache[h_node]
		except KeyError:
			tsk = moc_cache[h_node] = Task.classes['moc'](env=self.env, generator=self.generator)
			tsk.set_inputs(h_node)
			tsk.set_outputs(m_node)

			if self.generator:
				self.generator.tasks.append(tsk)

			# direct injection in the build phase (safe because called from the main thread)
			gen = self.generator.bld.producer
			gen.outstanding.append(tsk)
			gen.total += 1

			return tsk

	def moc_h_ext(self):
		ext = []
		try:
			ext = Options.options.qt_header_ext.split()
		except AttributeError:
			pass
		if not ext:
			ext = MOC_H
		return ext

	def add_moc_tasks(self):
		"""
		Create the moc tasks by looking in ``bld.raw_deps[self.uid()]``
		"""
		node = self.inputs[0]
		bld = self.generator.bld

		try:
			# compute the signature once to know if there is a moc file to create
			self.signature()
		except KeyError:
			# the moc file may be referenced somewhere else
			pass
		else:
			# remove the signature, it must be recomputed with the moc task
			delattr(self, 'cache_sig')

		include_nodes = [node.parent] + self.generator.includes_nodes

		moctasks = []
		mocfiles = set()
		for d in bld.raw_deps.get(self.uid(), []):
			if not d.endswith('.moc'):
				continue

			# process that base.moc only once
			if d in mocfiles:
				continue
			mocfiles.add(d)

			# find the source associated with the moc file
			h_node = None

			base2 = d[:-4]
			for x in include_nodes:
				for e in self.moc_h_ext():
					h_node = x.find_node(base2 + e)
					if h_node:
						break
				if h_node:
					m_node = h_node.change_ext('.moc')
					break
			else:
				# foo.cpp -> foo.cpp.moc
				for k in EXT_QT4:
					if base2.endswith(k):
						for x in include_nodes:
							h_node = x.find_node(base2)
							if h_node:
								break
						if h_node:
							m_node = h_node.change_ext(k + '.moc')
							break

			if not h_node:
				raise Errors.WafError('No source found for %r which is a moc file' % d)

			# create the moc task
			task = self.create_moc_task(h_node, m_node)
			moctasks.append(task)

		# simple scheduler dependency: run the moc task before others
		self.run_after.update(set(moctasks))
		self.moc_done = 1

class trans_update(Task.Task):
	"""Update a .ts files from a list of C++ files"""
	run_str = '${QT_LUPDATE} ${SRC} -ts ${TGT}'
	color   = 'BLUE'

class XMLHandler(ContentHandler):
	"""
	Parser for *.qrc* files
	"""
	def __init__(self):
		self.buf = []
		self.files = []
	def startElement(self, name, attrs):
		if name == 'file':
			self.buf = []
	def endElement(self, name):
		if name == 'file':
			self.files.append(str(''.join(self.buf)))
	def characters(self, cars):
		self.buf.append(cars)

@extension(*EXT_RCC)
def create_rcc_task(self, node):
	"Create rcc and cxx tasks for *.qrc* files"
	rcnode = node.change_ext('_rc.cpp')
	self.create_task('rcc', node, rcnode)
	cpptask = self.create_task('cxx', rcnode, rcnode.change_ext('.o'))
	try:
		self.compiled_tasks.append(cpptask)
	except AttributeError:
		self.compiled_tasks = [cpptask]
	return cpptask

@extension(*EXT_UI)
def create_uic_task(self, node):
	"hook for uic tasks"
	uictask = self.create_task('ui4', node)
	uictask.outputs = [self.path.find_or_declare(self.env['ui_PATTERN'] % node.name[:-3])]

@extension('.ts')
def add_lang(self, node):
	"""add all the .ts file into self.lang"""
	self.lang = self.to_list(getattr(self, 'lang', [])) + [node]

@feature('qt4')
@after_method('apply_link')
def apply_qt4(self):
	"""
	Add MOC_FLAGS which may be necessary for moc::

		def build(bld):
			bld.program(features='qt4', source='main.cpp', target='app', use='QTCORE')

	The additional parameters are:

	:param lang: list of translation files (\*.ts) to process
	:type lang: list of :py:class:`waflib.Node.Node` or string without the .ts extension
	:param update: whether to process the C++ files to update the \*.ts files (use **waf --translate**)
	:type update: bool
	:param langname: if given, transform the \*.ts files into a .qrc files to include in the binary file
	:type langname: :py:class:`waflib.Node.Node` or string without the .qrc extension
	"""
	if getattr(self, 'lang', None):
		qmtasks = []
		for x in self.to_list(self.lang):
			if isinstance(x, str):
				x = self.path.find_resource(x + '.ts')
			qmtasks.append(self.create_task('ts2qm', x, x.change_ext('.qm')))

		if getattr(self, 'update', None) and Options.options.trans_qt4:
			cxxnodes = [a.inputs[0] for a in self.compiled_tasks] + [
				a.inputs[0] for a in self.tasks if getattr(a, 'inputs', None) and a.inputs[0].name.endswith('.ui')]
			for x in qmtasks:
				self.create_task('trans_update', cxxnodes, x.inputs)

		if getattr(self, 'langname', None):
			qmnodes = [x.outputs[0] for x in qmtasks]
			rcnode = self.langname
			if isinstance(rcnode, str):
				rcnode = self.path.find_or_declare(rcnode + '.qrc')
			t = self.create_task('qm2rcc', qmnodes, rcnode)
			k = create_rcc_task(self, t.outputs[0])
			self.link_task.inputs.append(k.outputs[0])

	lst = []
	for flag in self.to_list(self.env['CXXFLAGS']):
		if len(flag) < 2:
			continue
		f = flag[0:2]
		if f in ('-D', '-I', '/D', '/I'):
			if (f[0] == '/'):
				lst.append('-' + flag[1:])
			else:
				lst.append(flag)
	self.env.append_value('MOC_FLAGS', lst)

@extension(*EXT_QT4)
def cxx_hook(self, node):
	"""
	Re-map C++ file extensions to the :py:class:`waflib.Tools.qt4.qxx` task.
	"""
	return self.create_compiled_task('qxx', node)

class rcc(Task.Task):
	"""
	Process *.qrc* files
	"""
	color   = 'BLUE'
	run_str = '${QT_RCC} -name ${tsk.rcname()} ${SRC[0].abspath()} ${RCC_ST} -o ${TGT}'
	ext_out = ['.h']

	def rcname(self):
		return os.path.splitext(self.inputs[0].name)[0]

	def scan(self):
		"""Parse the *.qrc* files"""
		if not has_xml:
			Logs.error('no xml support was found, the rcc dependencies will be incomplete!')
			return ([], [])

		parser = make_parser()
		curHandler = XMLHandler()
		parser.setContentHandler(curHandler)
		fi = open(self.inputs[0].abspath(), 'r')
		try:
			parser.parse(fi)
		finally:
			fi.close()

		nodes = []
		names = []
		root = self.inputs[0].parent
		for x in curHandler.files:
			nd = root.find_resource(x)
			if nd:
				nodes.append(nd)
			else:
				names.append(x)
		return (nodes, names)

class moc(Task.Task):
	"""
	Create *.moc* files
	"""
	color   = 'BLUE'
	run_str = '${QT_MOC} ${MOC_FLAGS} ${MOCCPPPATH_ST:INCPATHS} ${MOCDEFINES_ST:DEFINES} ${SRC} ${MOC_ST} ${TGT}'
	def keyword(self):
		return "Creating"
	def __str__(self):
		return self.outputs[0].path_from(self.generator.bld.launch_node())

class ui4(Task.Task):
	"""
	Process *.ui* files
	"""
	color   = 'BLUE'
	run_str = '${QT_UIC} ${SRC} -o ${TGT}'
	ext_out = ['.h']

class ts2qm(Task.Task):
	"""
	Create *.qm* files from *.ts* files
	"""
	color   = 'BLUE'
	run_str = '${QT_LRELEASE} ${QT_LRELEASE_FLAGS} ${SRC} -qm ${TGT}'

class qm2rcc(Task.Task):
	"""
	Transform *.qm* files into *.rc* files
	"""
	color = 'BLUE'
	after = 'ts2qm'

	def run(self):
		"""Create a qrc file including the inputs"""
		txt = '\n'.join(['<file>%s</file>' % k.path_from(self.outputs[0].parent) for k in self.inputs])
		code = '<!DOCTYPE RCC><RCC version="1.0">\n<qresource>\n%s\n</qresource>\n</RCC>' % txt
		self.outputs[0].write(code)

def configure(self):
	"""
	Besides the configuration options, the environment variable QT4_ROOT may be used
	to give the location of the qt4 libraries (absolute path).

	The detection will use the program *pkg-config* through :py:func:`waflib.Tools.config_c.check_cfg`
	"""
	self.find_qt4_binaries()
	self.set_qt4_libs_to_check()
	self.set_qt4_defines()
	self.find_qt4_libraries()
	self.add_qt4_rpath()
	self.simplify_qt4_libs()

@conf
def find_qt4_binaries(self):
	env = self.env
	opt = Options.options

	qtdir = getattr(opt, 'qtdir', '')
	qtbin = getattr(opt, 'qtbin', '')

	paths = []

	if qtdir:
		qtbin = os.path.join(qtdir, 'bin')

	# the qt directory has been given from QT4_ROOT - deduce the qt binary path
	if not qtdir:
		qtdir = os.environ.get('QT4_ROOT', '')
		qtbin = os.environ.get('QT4_BIN') or os.path.join(qtdir, 'bin')

	if qtbin:
		paths = [qtbin]

	# no qtdir, look in the path and in /usr/local/Trolltech
	if not qtdir:
		paths = os.environ.get('PATH', '').split(os.pathsep)
		paths.append('/usr/share/qt4/bin/')
		try:
			lst = Utils.listdir('/usr/local/Trolltech/')
		except OSError:
			pass
		else:
			if lst:
				lst.sort()
				lst.reverse()

				# keep the highest version
				qtdir = '/usr/local/Trolltech/%s/' % lst[0]
				qtbin = os.path.join(qtdir, 'bin')
				paths.append(qtbin)

	# at the end, try to find qmake in the paths given
	# keep the one with the highest version
	cand = None
	prev_ver = ['4', '0', '0']
	for qmk in ('qmake-qt4', 'qmake4', 'qmake'):
		try:
			qmake = self.find_program(qmk, path_list=paths)
		except self.errors.ConfigurationError:
			pass
		else:
			try:
				version = self.cmd_and_log(qmake + ['-query', 'QT_VERSION']).strip()
			except self.errors.WafError:
				pass
			else:
				if version:
					new_ver = version.split('.')
					if new_ver > prev_ver:
						cand = qmake
						prev_ver = new_ver
	if cand:
		self.env.QMAKE = cand
	else:
		self.fatal('Could not find qmake for qt4')

	qtbin = self.cmd_and_log(self.env.QMAKE + ['-query', 'QT_INSTALL_BINS']).strip() + os.sep

	def find_bin(lst, var):
		if var in env:
			return
		for f in lst:
			try:
				ret = self.find_program(f, path_list=paths)
			except self.errors.ConfigurationError:
				pass
			else:
				env[var]=ret
				break

	find_bin(['uic-qt3', 'uic3'], 'QT_UIC3')
	find_bin(['uic-qt4', 'uic'], 'QT_UIC')
	if not env.QT_UIC:
		self.fatal('cannot find the uic compiler for qt4')

	self.start_msg('Checking for uic version')
	uicver = self.cmd_and_log(env.QT_UIC + ["-version"], output=Context.BOTH)
	uicver = ''.join(uicver).strip()
	uicver = uicver.replace('Qt User Interface Compiler ','').replace('User Interface Compiler for Qt', '')
	self.end_msg(uicver)
	if uicver.find(' 3.') != -1:
		self.fatal('this uic compiler is for qt3, add uic for qt4 to your path')

	find_bin(['moc-qt4', 'moc'], 'QT_MOC')
	find_bin(['rcc-qt4', 'rcc'], 'QT_RCC')
	find_bin(['lrelease-qt4', 'lrelease'], 'QT_LRELEASE')
	find_bin(['lupdate-qt4', 'lupdate'], 'QT_LUPDATE')

	env['UIC3_ST']= '%s -o %s'
	env['UIC_ST'] = '%s -o %s'
	env['MOC_ST'] = '-o'
	env['ui_PATTERN'] = 'ui_%s.h'
	env['QT_LRELEASE_FLAGS'] = ['-silent']
	env.MOCCPPPATH_ST = '-I%s'
	env.MOCDEFINES_ST = '-D%s'

@conf
def find_qt4_libraries(self):
	qtlibs = getattr(Options.options, 'qtlibs', None) or os.environ.get("QT4_LIBDIR")
	if not qtlibs:
		try:
			qtlibs = self.cmd_and_log(self.env.QMAKE + ['-query', 'QT_INSTALL_LIBS']).strip()
		except Errors.WafError:
			qtdir = self.cmd_and_log(self.env.QMAKE + ['-query', 'QT_INSTALL_PREFIX']).strip() + os.sep
			qtlibs = os.path.join(qtdir, 'lib')
	self.msg('Found the Qt4 libraries in', qtlibs)

	qtincludes =  os.environ.get("QT4_INCLUDES") or self.cmd_and_log(self.env.QMAKE + ['-query', 'QT_INSTALL_HEADERS']).strip()
	env = self.env
	if not 'PKG_CONFIG_PATH' in os.environ:
		os.environ['PKG_CONFIG_PATH'] = '%s:%s/pkgconfig:/usr/lib/qt4/lib/pkgconfig:/opt/qt4/lib/pkgconfig:/usr/lib/qt4/lib:/opt/qt4/lib' % (qtlibs, qtlibs)

	try:
		if os.environ.get("QT4_XCOMPILE"):
			raise self.errors.ConfigurationError()
		self.check_cfg(atleast_pkgconfig_version='0.1')
	except self.errors.ConfigurationError:
		for i in self.qt4_vars:
			uselib = i.upper()
			if Utils.unversioned_sys_platform() == "darwin":
				# Since at least qt 4.7.3 each library locates in separate directory
				frameworkName = i + ".framework"
				qtDynamicLib = os.path.join(qtlibs, frameworkName, i)
				if os.path.exists(qtDynamicLib):
					env.append_unique('FRAMEWORK_' + uselib, i)
					self.msg('Checking for %s' % i, qtDynamicLib, 'GREEN')
				else:
					self.msg('Checking for %s' % i, False, 'YELLOW')
				env.append_unique('INCLUDES_' + uselib, os.path.join(qtlibs, frameworkName, 'Headers'))
			elif env.DEST_OS != "win32":
				qtDynamicLib = os.path.join(qtlibs, "lib" + i + ".so")
				qtStaticLib = os.path.join(qtlibs, "lib" + i + ".a")
				if os.path.exists(qtDynamicLib):
					env.append_unique('LIB_' + uselib, i)
					self.msg('Checking for %s' % i, qtDynamicLib, 'GREEN')
				elif os.path.exists(qtStaticLib):
					env.append_unique('LIB_' + uselib, i)
					self.msg('Checking for %s' % i, qtStaticLib, 'GREEN')
				else:
					self.msg('Checking for %s' % i, False, 'YELLOW')

				env.append_unique('LIBPATH_' + uselib, qtlibs)
				env.append_unique('INCLUDES_' + uselib, qtincludes)
				env.append_unique('INCLUDES_' + uselib, os.path.join(qtincludes, i))
			else:
				# Release library names are like QtCore4
				for k in ("lib%s.a", "lib%s4.a", "%s.lib", "%s4.lib"):
					lib = os.path.join(qtlibs, k % i)
					if os.path.exists(lib):
						env.append_unique('LIB_' + uselib, i + k[k.find("%s") + 2 : k.find('.')])
						self.msg('Checking for %s' % i, lib, 'GREEN')
						break
				else:
					self.msg('Checking for %s' % i, False, 'YELLOW')

				env.append_unique('LIBPATH_' + uselib, qtlibs)
				env.append_unique('INCLUDES_' + uselib, qtincludes)
				env.append_unique('INCLUDES_' + uselib, os.path.join(qtincludes, i))

				# Debug library names are like QtCore4d
				uselib = i.upper() + "_debug"
				for k in ("lib%sd.a", "lib%sd4.a", "%sd.lib", "%sd4.lib"):
					lib = os.path.join(qtlibs, k % i)
					if os.path.exists(lib):
						env.append_unique('LIB_' + uselib, i + k[k.find("%s") + 2 : k.find('.')])
						self.msg('Checking for %s' % i, lib, 'GREEN')
						break
				else:
					self.msg('Checking for %s' % i, False, 'YELLOW')

				env.append_unique('LIBPATH_' + uselib, qtlibs)
				env.append_unique('INCLUDES_' + uselib, qtincludes)
				env.append_unique('INCLUDES_' + uselib, os.path.join(qtincludes, i))
	else:
		for i in self.qt4_vars_debug + self.qt4_vars:
			self.check_cfg(package=i, args='--cflags --libs', mandatory=False)

@conf
def simplify_qt4_libs(self):
	# the libpaths make really long command-lines
	# remove the qtcore ones from qtgui, etc
	env = self.env
	def process_lib(vars_, coreval):
		for d in vars_:
			var = d.upper()
			if var == 'QTCORE':
				continue

			value = env['LIBPATH_'+var]
			if value:
				core = env[coreval]
				accu = []
				for lib in value:
					if lib in core:
						continue
					accu.append(lib)
				env['LIBPATH_'+var] = accu

	process_lib(self.qt4_vars,       'LIBPATH_QTCORE')
	process_lib(self.qt4_vars_debug, 'LIBPATH_QTCORE_DEBUG')

@conf
def add_qt4_rpath(self):
	# rpath if wanted
	env = self.env
	if getattr(Options.options, 'want_rpath', False):
		def process_rpath(vars_, coreval):
			for d in vars_:
				var = d.upper()
				value = env['LIBPATH_'+var]
				if value:
					core = env[coreval]
					accu = []
					for lib in value:
						if var != 'QTCORE':
							if lib in core:
								continue
						accu.append('-Wl,--rpath='+lib)
					env['RPATH_'+var] = accu
		process_rpath(self.qt4_vars,       'LIBPATH_QTCORE')
		process_rpath(self.qt4_vars_debug, 'LIBPATH_QTCORE_DEBUG')

@conf
def set_qt4_libs_to_check(self):
	if not hasattr(self, 'qt4_vars'):
		self.qt4_vars = QT4_LIBS
	self.qt4_vars = Utils.to_list(self.qt4_vars)
	if not hasattr(self, 'qt4_vars_debug'):
		self.qt4_vars_debug = [a + '_debug' for a in self.qt4_vars]
	self.qt4_vars_debug = Utils.to_list(self.qt4_vars_debug)

@conf
def set_qt4_defines(self):
	if sys.platform != 'win32':
		return
	for x in self.qt4_vars:
		y = x[2:].upper()
		self.env.append_unique('DEFINES_%s' % x.upper(), 'QT_%s_LIB' % y)
		self.env.append_unique('DEFINES_%s_DEBUG' % x.upper(), 'QT_%s_LIB' % y)

def options(opt):
	"""
	Command-line options
	"""
	opt.add_option('--want-rpath', action='store_true', default=False, dest='want_rpath', help='enable the rpath for qt libraries')

	opt.add_option('--header-ext',
		type='string',
		default='',
		help='header extension for moc files',
		dest='qt_header_ext')

	for i in 'qtdir qtbin qtlibs'.split():
		opt.add_option('--'+i, type='string', default='', dest=i)

	opt.add_option('--translate', action="store_true", help="collect translation strings", dest="trans_qt4", default=False)