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|
#!/usr/bin/env python3
# Copyright 2013-2014 The Meson development team
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# This file contains the detection logic for external
# dependencies. Mostly just uses pkg-config but also contains
# custom logic for packages that don't provide them.
# Currently one file, should probably be split into a
# package before this gets too big.
import os, stat, glob, subprocess, shutil
from coredata import MesonException
import environment
import mlog
import mesonlib
class DependencyException(MesonException):
def __init__(self, *args, **kwargs):
MesonException.__init__(self, *args, **kwargs)
class CustomRule:
def __init__(self, cmd_list, name_templ, src_keyword, name, description):
self.cmd_list = cmd_list
self.name_templ = name_templ
self.src_keyword = src_keyword
self.name = name
self.description = description
class Dependency():
def __init__(self):
self.name = "null"
def get_compile_args(self):
return []
def get_link_args(self):
return []
def found(self):
return False
def get_sources(self):
"""Source files that need to be added to the target.
As an example, gtest-all.cc when using GTest."""
return []
def get_name(self):
return self.name
# Rules for commands to execute before compilation
# such as Qt's moc preprocessor.
def get_generate_rules(self):
return []
def get_exe_args(self):
return []
class PkgConfigDependency(Dependency):
pkgconfig_found = None
def __init__(self, name, required):
Dependency.__init__(self)
self.name = name
if PkgConfigDependency.pkgconfig_found is None:
self.check_pkgconfig()
if not PkgConfigDependency.pkgconfig_found:
raise DependencyException('Pkg-config not found.')
self.is_found = False
p = subprocess.Popen(['pkg-config', '--modversion', name], stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out = p.communicate()[0]
if p.returncode != 0:
mlog.log('Dependency', name, 'found:', mlog.red('NO'))
if required:
raise DependencyException('Required dependency %s not found.' % name)
self.modversion = 'none'
self.cargs = []
self.libs = []
else:
mlog.log('Dependency', mlog.bold(name), 'found:', mlog.green('YES'))
self.is_found = True
self.modversion = out.decode().strip()
p = subprocess.Popen(['pkg-config', '--cflags', name], stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out = p.communicate()[0]
if p.returncode != 0:
raise RuntimeError('Could not generate cargs for %s.' % name)
self.cargs = out.decode().split()
p = subprocess.Popen(['pkg-config', '--libs', name], stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out = p.communicate()[0]
if p.returncode != 0:
raise RuntimeError('Could not generate libs for %s.' % name)
self.libs = out.decode().split()
def get_modversion(self):
return self.modversion
def get_compile_args(self):
return self.cargs
def get_link_args(self):
return self.libs
def check_pkgconfig(self):
try:
p = subprocess.Popen(['pkg-config', '--version'], stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out = p.communicate()[0]
if p.returncode == 0:
mlog.log('Found pkg-config:', mlog.bold(shutil.which('pkg-config')),
'(%s)' % out.decode().strip())
PkgConfigDependency.pkgconfig_found = True
return
except Exception:
pass
PkgConfigDependency.pkgconfig_found = False
mlog.log('Found Pkg-config:', mlog.red('NO'))
def found(self):
return self.is_found
class WxDependency(Dependency):
wx_found = None
def __init__(self, kwargs):
Dependency.__init__(self)
if WxDependency.wx_found is None:
self.check_wxconfig()
if not WxDependency.wx_found:
raise DependencyException('Wx-config not found.')
self.is_found = False
p = subprocess.Popen(['wx-config', '--version'], stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out = p.communicate()[0]
if p.returncode != 0:
mlog.log('Dependency wxwidgets found:', mlog.red('NO'))
self.cargs = []
self.libs = []
self.is_found = False
else:
mlog.log('Dependency wxwidgets found:', mlog.green('YES'))
self.is_found = True
self.modversion = out.decode().strip()
# wx-config seems to have a cflags as well but since it requires C++,
# this should be good, at least for now.
p = subprocess.Popen(['wx-config', '--cxxflags'], stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out = p.communicate()[0]
if p.returncode != 0:
raise RuntimeError('Could not generate cargs for wxwidgets.')
self.cargs = out.decode().split()
p = subprocess.Popen(['wx-config', '--libs'], stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out = p.communicate()[0]
if p.returncode != 0:
raise RuntimeError('Could not generate libs for wxwidgets.')
self.libs = out.decode().split()
def get_modversion(self):
return self.modversion
def get_compile_args(self):
return self.cargs
def get_link_args(self):
return self.libs
def check_wxconfig(self):
try:
p = subprocess.Popen(['wx-config', '--version'], stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out = p.communicate()[0]
if p.returncode == 0:
mlog.log('Found wx-config:', mlog.bold(shutil.which('wx-config')),
'(%s)' % out.decode().strip())
WxDependency.wx_found = True
return
except Exception:
pass
WxDependency.wxconfig_found = False
mlog.log('Found wx-config:', mlog.red('NO'))
def found(self):
return self.is_found
class ExternalProgram():
def __init__(self, name, fullpath=None, silent=False, search_dir=None):
self.name = name
if fullpath is not None:
if not isinstance(fullpath, list):
self.fullpath = [fullpath]
else:
self.fullpath = fullpath
else:
self.fullpath = [shutil.which(name)]
if self.fullpath[0] is None and search_dir is not None:
trial = os.path.join(search_dir, name)
suffix = os.path.splitext(trial)[-1].lower()[1:]
if mesonlib.is_windows() and (suffix == 'exe' or suffix == 'com'\
or suffix == 'bat'):
self.fullpath = [trial]
elif not mesonlib.is_windows() and os.access(trial, os.X_OK):
self.fullpath = [trial]
else:
# Now getting desperate. Maybe it is a script file that is a) not chmodded
# executable or b) we are on windows so they can't be directly executed.
try:
first_line = open(trial).readline().strip()
if first_line.startswith('#!'):
commands = first_line[2:].split('#')[0].strip().split()
if mesonlib.is_windows():
commands[0] = commands[0].split('/')[-1] # Windows does not have /usr/bin.
self.fullpath = commands + [trial]
except Exception:
pass
if not silent:
if self.found():
mlog.log('Program', mlog.bold(name), 'found:', mlog.green('YES'), '(%s)' % ' '.join(self.fullpath))
else:
mlog.log('Program', mlog.bold(name), 'found:', mlog.red('NO'))
def found(self):
return self.fullpath[0] is not None
def get_command(self):
return self.fullpath
def get_name(self):
return self.name
class ExternalLibrary(Dependency):
def __init__(self, name, fullpath=None, silent=False):
super().__init__()
self.name = name
self.fullpath = fullpath
if not silent:
if self.found():
mlog.log('Library', mlog.bold(name), 'found:', mlog.green('YES'), '(%s)' % self.fullpath)
else:
mlog.log('Library', mlog.bold(name), 'found:', mlog.red('NO'))
def found(self):
return self.fullpath is not None
def get_link_args(self):
if self.found():
return [self.fullpath]
return []
class BoostDependency(Dependency):
# Some boost libraries have different names for
# their sources and libraries. This dict maps
# between the two.
name2lib = {'test' : 'unit_test_framework'}
def __init__(self, kwargs):
Dependency.__init__(self)
self.name = 'boost'
try:
self.boost_root = os.environ['BOOST_ROOT']
if not os.path.isabs(self.boost_root):
raise DependencyException('BOOST_ROOT must be an absolute path.')
except KeyError:
self.boost_root = None
if self.boost_root is None:
self.incdir = '/usr/include/boost'
else:
self.incdir = os.path.join(self.boost_root, 'include/boost')
self.src_modules = {}
self.lib_modules = {}
self.lib_modules_mt = {}
self.detect_version()
self.requested_modules = self.get_requested(kwargs)
module_str = ', '.join(self.requested_modules)
if self.version is not None:
self.detect_src_modules()
self.detect_lib_modules()
self.validate_requested()
if self.boost_root is not None:
info = self.version + ', ' + self.boost_root
else:
info = self.version
mlog.log('Dependency Boost (%s) found:' % module_str, mlog.green('YES'),
'(' + info + ')')
else:
mlog.log("Dependency Boost (%s) found:" % module_str, mlog.red('NO'))
def get_compile_args(self):
args = []
if self.boost_root is not None:
args.append('-I' + os.path.join(self.boost_root, 'include'))
return args
def get_requested(self, kwargs):
modules = 'modules'
if not modules in kwargs:
raise DependencyException('Boost dependency must specify "%s" keyword.' % modules)
candidates = kwargs[modules]
if isinstance(candidates, str):
return [candidates]
for c in candidates:
if not isinstance(c, str):
raise DependencyException('Boost module argument is not a string.')
return candidates
def validate_requested(self):
for m in self.requested_modules:
if m not in self.src_modules:
raise DependencyException('Requested Boost module "%s" not found.' % m)
def found(self):
return self.version is not None
def get_version(self):
return self.version
def detect_version(self):
try:
ifile = open(os.path.join(self.incdir, 'version.hpp'))
except FileNotFoundError:
self.version = None
return
for line in ifile:
if line.startswith("#define") and 'BOOST_LIB_VERSION' in line:
ver = line.split()[-1]
ver = ver[1:-1]
self.version = ver.replace('_', '.')
return
self.version = None
def detect_src_modules(self):
for entry in os.listdir(self.incdir):
entry = os.path.join(self.incdir, entry)
if stat.S_ISDIR(os.stat(entry).st_mode):
self.src_modules[os.path.split(entry)[-1]] = True
def detect_lib_modules(self):
globber = 'libboost_*.so' # FIXME, make platform independent.
if self.boost_root is None:
libdirs = environment.get_library_dirs()
else:
libdirs = [os.path.join(self.boost_root, 'lib')]
for libdir in libdirs:
for entry in glob.glob(os.path.join(libdir, globber)):
lib = os.path.basename(entry)
name = lib.split('.')[0].split('_', 1)[-1]
# I'm not 100% sure what to do here. Some distros
# have modules such as thread only as -mt versions.
if entry.endswith('-mt.so'):
self.lib_modules_mt[name] = True
else:
self.lib_modules[name] = True
def get_link_args(self):
args = []
if self.boost_root:
# FIXME, these are in gcc format, not msvc.
# On the other hand, so are the args that
# pkg-config returns.
args.append('-L' + os.path.join(self.boost_root, 'lib'))
for module in self.requested_modules:
module = BoostDependency.name2lib.get(module, module)
if module in self.lib_modules or module in self.lib_modules_mt:
linkcmd = '-lboost_' + module
args.append(linkcmd)
# FIXME a hack, but Boost's testing framework has a lot of
# different options and it's hard to determine what to do
# without feedback from actual users. Update this
# as we get more bug reports.
if module == 'unit_testing_framework':
args.append('-lboost_test_exec_monitor')
elif module + '-mt' in self.lib_modules_mt:
linkcmd = '-lboost_' + module + '-mt'
args.append(linkcmd)
if module == 'unit_testing_framework':
args.append('-lboost_test_exec_monitor-mt')
return args
def get_sources(self):
return []
class GTestDependency(Dependency):
def __init__(self, kwargs):
Dependency.__init__(self)
self.main = kwargs.get('main', False)
self.name = 'gtest'
self.libdir = '/usr/lib'
self.libname = 'libgtest.so'
self.libmain_name = 'libgtest_main.so'
self.include_dir = '/usr/include'
self.src_include_dir = '/usr/src/gtest'
self.src_dir = '/usr/src/gtest/src'
self.all_src = os.path.join(self.src_dir, 'gtest-all.cc')
self.main_src = os.path.join(self.src_dir, 'gtest_main.cc')
self.detect()
def found(self):
return self.is_found
def detect(self):
libname = os.path.join(self.libdir, self.libname)
mainname = os.path.join(self.libdir, self.libmain_name)
if os.path.exists(libname) and os.path.exists(mainname):
self.is_found = True
self.compile_args = []
self.link_args = ['-lgtest']
if self.main:
self.link_args.append('-lgtest_main')
self.sources = []
mlog.log('Dependency GTest found:', mlog.green('YES'), '(prebuilt)')
elif os.path.exists(self.src_dir):
self.is_found = True
self.compile_args = ['-I' + self.src_include_dir]
self.link_args = []
if self.main:
self.sources = [self.all_src, self.main_src]
else:
self.sources = [self.all_src]
mlog.log('Dependency GTest found:', mlog.green('YES'), '(building self)')
else:
mlog.log('Dependency GTest found:', mlog.red('NO'))
self.is_found = False
if self.is_found:
self.link_args.append('-lpthread')
return self.is_found
def get_compile_args(self):
arr = []
if self.include_dir != '/usr/include':
arr.append('-I' + self.include_dir)
arr.append('-I' + self.src_include_dir)
return arr
def get_link_args(self):
return self.link_args
def get_version(self):
return '1.something_maybe'
def get_sources(self):
return self.sources
class GMockDependency(Dependency):
def __init__(self, kwargs):
Dependency.__init__(self)
# GMock may be a library or just source.
# Work with both.
self.name = 'gmock'
self.libdir = '/usr/lib'
self.libname = 'libgmock.so'
self.src_include_dir = '/usr/src/gmock'
self.src_dir = '/usr/src/gmock/src'
self.all_src = os.path.join(self.src_dir, 'gmock-all.cc')
self.main_src = os.path.join(self.src_dir, 'gmock_main.cc')
fname = os.path.join(self.libdir, self.libname)
if os.path.exists(fname):
self.is_found = True
self.compile_args = []
self.link_args = ['-lgmock']
self.sources = []
mlog.log('Dependency GMock found:', mlog.green('YES'), '(prebuilt)')
elif os.path.exists(self.src_dir):
self.is_found = True
self.compile_args = ['-I' + self.src_include_dir]
self.link_args = []
if kwargs.get('main', False):
self.sources = [self.all_src, self.main_src]
else:
self.sources = [self.all_src]
mlog.log('Dependency GMock found:', mlog.green('YES'), '(building self)')
else:
mlog.log('Dependency GMock found:', mlog.red('NO'))
self.is_found = False
def get_version(self):
return '1.something_maybe'
def get_compile_args(self):
return self.compile_args
def get_sources(self):
return self.sources
def get_link_args(self):
return self.link_args
def found(self):
return self.is_found
qt5toolinfo_printed = False
class Qt5Dependency(Dependency):
def __init__(self, kwargs):
Dependency.__init__(self)
self.name = 'qt5'
self.root = '/usr'
self.modules = []
mods = kwargs.get('modules', [])
if isinstance(mods, str):
mods = [mods]
for module in mods:
self.modules.append(PkgConfigDependency('Qt5' + module, False))
if len(self.modules) == 0:
raise DependencyException('No Qt5 modules specified.')
if not qt5toolinfo_printed:
mlog.log('Dependency Qt5 tools:')
self.find_exes()
def find_exes(self):
# The binaries have different names on different
# distros. Joy.
global qt5toolinfo_printed
self.moc = ExternalProgram('moc', ['moc'], silent=True)
if not self.moc.found():
self.moc = ExternalProgram('moc-qt5', silent=True)
self.uic = ExternalProgram('uic', ['uic'], silent=True)
if not self.uic.found():
self.uic = ExternalProgram('uic-qt5', silent=True)
self.rcc = ExternalProgram('rcc', ['rcc'], silent=True)
if not self.rcc.found():
self.rcc = ExternalProgram('rcc-qt5', silent=True)
# Moc, uic and rcc write their version strings to stderr.
# Moc and rcc return a non-zero result when doing so.
# What kind of an idiot thought that was a good idea?
if self.moc.found():
mp = subprocess.Popen(self.moc.get_command() + ['-v'],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
(stdout, stderr) = mp.communicate()
stdout = stdout.decode().strip()
stderr = stderr.decode().strip()
if 'Qt 5' in stderr:
moc_ver = stderr
elif '5.' in stdout:
moc_ver = stdout
else:
raise DependencyException('Moc preprocessor is not for Qt 5. Output:\n%s\n%s' %
(stdout, stderr))
if not qt5toolinfo_printed:
mlog.log(' moc:', mlog.green('YES'), '(%s, %s)' % \
(' '.join(self.moc.fullpath), moc_ver.split()[-1]))
else:
if not qt5toolinfo_printed:
mlog.log(' moc:', mlog.red('NO'))
if self.uic.found():
up = subprocess.Popen(self.uic.get_command() + ['-v'],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
(stdout, stderr) = up.communicate()
stdout = stdout.decode().strip()
stderr = stderr.decode().strip()
if 'version 5.' in stderr:
uic_ver = stderr
elif '5.' in stdout:
uic_ver = stdout
else:
raise DependencyException('Uic compiler is not for Qt 5. Output:\n%s\n%s' %
(stdout, stderr))
if not qt5toolinfo_printed:
mlog.log(' uic:', mlog.green('YES'), '(%s, %s)' % \
(' '.join(self.uic.fullpath), uic_ver.split()[-1]))
else:
if not qt5toolinfo_printed:
mlog.log(' uic:', mlog.red('NO'))
if self.rcc.found():
rp = subprocess.Popen(self.rcc.get_command() + ['-v'],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
(stdout, stderr) = rp.communicate()
stdout = stdout.decode().strip()
stderr = stderr.decode().strip()
if 'version 5.' in stderr:
rcc_ver = stderr
elif '5.' in stdout:
rcc_ver = stdout
else:
raise DependencyException('Rcc compiler is not for Qt 5. Output:\n%s\n%s' %
(stdout, stderr))
if not qt5toolinfo_printed:
mlog.log(' rcc:', mlog.green('YES'), '(%s, %s)'\
% (' '.join(self.rcc.fullpath), rcc_ver.split()[-1]))
else:
if not qt5toolinfo_printed:
mlog.log(' rcc:', mlog.red('NO'))
qt5toolinfo_printed = True
def get_version(self):
return self.modules[0].get_version()
def get_compile_args(self):
args = []
for m in self.modules:
args += m.get_compile_args()
return args
def get_sources(self):
return []
def get_link_args(self):
args = []
for module in self.modules:
args += module.get_link_args()
return args
def found(self):
if not self.moc.found():
return False
if not self.uic.found():
return False
if not self.rcc.found():
return False
for i in self.modules:
if not i.found():
return False
return True
def get_generate_rules(self):
moc_rule = CustomRule(self.moc.get_command() + ['$mocargs', '@INFILE@', '-o', '@OUTFILE@'],
'moc_@BASENAME@.cpp', 'moc_headers', 'moc_hdr_compile',
'Compiling header @INFILE@ with the moc preprocessor')
mocsrc_rule = CustomRule(self.moc.get_command() + ['$mocargs', '@INFILE@', '-o', '@OUTFILE@'],
'@BASENAME@.moc', 'moc_sources', 'moc_src_compile',
'Compiling source @INFILE@ with the moc preprocessor')
ui_rule = CustomRule(self.uic.get_command() + ['@INFILE@', '-o', '@OUTFILE@'],
'ui_@BASENAME@.h', 'ui_files', 'ui_compile',
'Compiling @INFILE@ with the ui compiler')
rrc_rule = CustomRule(self.rcc.get_command() + ['@INFILE@', '-o', '@OUTFILE@',
'${rcc_args}'], '@BASENAME@.cpp','qresources',
'rc_compile', 'Compiling @INFILE@ with the rrc compiler')
return [moc_rule, mocsrc_rule, ui_rule, rrc_rule]
def get_exe_args(self):
# Qt5 seems to require this always.
# Fix this to be more portable, especially to MSVC.
return ['-fPIE']
class GnuStepDependency(Dependency):
def __init__(self, kwargs):
Dependency.__init__(self)
self.modules = kwargs.get('modules', [])
self.detect()
def detect(self):
confprog = 'gnustep-config'
gp = subprocess.Popen([confprog, '--help'],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
gp.communicate()
if gp.returncode != 0:
self.args = None
mlog.log('Dependency GnuStep found:', mlog.red('NO'))
return
if 'gui' in self.modules:
arg = '--gui-libs'
else:
arg = '--base-libs'
fp = subprocess.Popen([confprog, '--objc-flags'],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
(flagtxt, flagerr) = fp.communicate()
flagtxt = flagtxt.decode()
flagerr = flagerr.decode()
if fp.returncode != 0:
raise DependencyException('Error getting objc-args: %s %s' % (flagtxt, flagerr))
args = flagtxt.split()
self.args = self.filter_arsg(args)
fp = subprocess.Popen([confprog, arg],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
(libtxt, liberr) = fp.communicate()
libtxt = libtxt.decode()
liberr = liberr.decode()
if fp.returncode != 0:
raise DependencyException('Error getting objc-lib args: %s %s' % (libtxt, liberr))
self.libs = self.weird_filter(libtxt.split())
mlog.log('Dependency GnuStep found:', mlog.green('YES'))
def weird_filter(self, elems):
"""When building packages, the output of the enclosing Make
is sometimes mixed among the subprocess output. I have no idea
why. As a hack filter out everything that is not a flag."""
return [e for e in elems if e.startswith('-')]
def filter_arsg(self, args):
"""gnustep-config returns a bunch of garbage args such
as -O2 and so on. Drop everything that is not needed."""
result = []
for f in args:
if f.startswith('-D') or f.startswith('-f') or \
f.startswith('-I') or f == '-pthread' or\
(f.startswith('-W') and not f == '-Wall'):
result.append(f)
return result
def found(self):
return self.args is not None
def get_compile_args(self):
if self.args is None:
return []
return self.args
def get_link_args(self):
return self.libs
class AppleFrameworks(Dependency):
def __init__(self, kwargs):
Dependency.__init__(self)
modules = kwargs.get('modules', [])
if isinstance(modules, str):
modules = [modules]
if len(modules) == 0:
raise DependencyException("AppleFrameworks dependency requires at least one module.")
self.frameworks = modules
def get_link_args(self):
args = []
for f in self.frameworks:
args.append('-framework')
args.append(f)
return args
def found(self):
return mesonlib.is_osx()
class ExtraFrameworkDependency(Dependency):
def __init__(self, name, required):
Dependency.__init__(self)
self.name = None
self.detect(name)
if self.found():
mlog.log('Dependency', mlog.bold(name), 'found:', mlog.green('YES'), os.path.join(self.path, self.name))
else:
mlog.log('Dependency', name, 'found:', mlog.red('NO'))
def detect(self, name):
lname = name.lower()
paths = ['/Library/Frameworks']
for p in paths:
for d in os.listdir(p):
fullpath = os.path.join(p, d)
if lname != d.split('.')[0].lower():
continue
if not stat.S_ISDIR(os.stat(fullpath).st_mode):
continue
self.path = p
self.name = d
return
def get_compile_args(self):
return ['-I' + os.path.join(self.path, self.name, 'Headers')]
def get_link_args(self):
return ['-F' + self.path, '-framework', self.name.split('.')[0]]
def found(self):
return self.name is not None
def get_dep_identifier(name, kwargs):
elements = [name]
modlist = kwargs.get('modules', [])
if isinstance(modlist, str):
modlist = [modlist]
for module in modlist:
elements.append(module)
return '/'.join(elements)
def find_external_dependency(name, kwargs):
required = kwargs.get('required', True)
if not isinstance(required, bool):
raise DependencyException('Keyword "required" must be a boolean.')
if name in packages:
dep = packages[name](kwargs)
if required and not dep.found():
raise DependencyException('Dependency "%s" not found' % name)
return dep
pkg_exc = None
pkgdep = None
try:
pkgdep = PkgConfigDependency(name, required)
if pkgdep.found():
return pkgdep
except Exception as e:
pkg_exc = e
if mesonlib.is_osx():
return ExtraFrameworkDependency(name, required)
if pkg_exc is not None:
raise pkg_exc
return pkgdep
# This has to be at the end so the classes it references
# are defined.
packages = {'boost': BoostDependency,
'gtest': GTestDependency,
'gmock': GMockDependency,
'qt5': Qt5Dependency,
'Qt5': Qt5Dependency, # Qt people sure do love their upper case.
'gnustep': GnuStepDependency,
'appleframeworks': AppleFrameworks,
'wxwidgets' : WxDependency,
}
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