dependencies: Add a new class ExternalDependency

This class now consolidates a lot of the logic that each external
dependency was duplicating in its class definition.

All external dependencies now set:

* self.version
* self.compile_args and self.link_args
* self.is_found (if found)
* self.sources
* etc

And the abstract ExternalDependency class defines the methods that
will fetch those properties. Some classes still override that for
various reasons, but those should also be migrated to properties as
far as possible.

Next step is to consolidate and standardize the way in which we call
'configuration binaries' such as sdl2-config, llvm-config, pkg-config,
etc. Currently each class has to duplicate code involved with that
even though the format is very similar.

Currently only pkg-config supports multiple version requirements, and
some classes don't even properly check the version requirement. That
will also become easier now.

6 files changed, 203 insertions, 385 deletions

diff --git a/mesonbuild/dependencies/__init__.py b/mesonbuild/dependencies/__init__.py
index ec11152..3d41a2b 100644
--- a/mesonbuild/dependencies/__init__.py
+++ b/mesonbuild/dependencies/__init__.py
@@ -13,8 +13,9 @@
 # limitations under the License.
 
 from .base import (  # noqa: F401
-    Dependency, DependencyException, DependencyMethods, ExternalProgram, ExternalLibrary, ExtraFrameworkDependency,
-    InternalDependency, PkgConfigDependency, find_external_dependency, get_dep_identifier, packages)
+    Dependency, DependencyException, DependencyMethods, ExternalProgram,
+    ExternalDependency, ExternalLibrary, ExtraFrameworkDependency, InternalDependency,
+    PkgConfigDependency, find_external_dependency, get_dep_identifier, packages)
 from .dev import GMockDependency, GTestDependency, LLVMDependency, ValgrindDependency
 from .misc import BoostDependency, Python3Dependency, ThreadDependency
 from .platform import AppleFrameworks
diff --git a/mesonbuild/dependencies/base.py b/mesonbuild/dependencies/base.py
index 139ff39..d727021 100644
--- a/mesonbuild/dependencies/base.py
+++ b/mesonbuild/dependencies/base.py
@@ -52,9 +52,13 @@ class DependencyMethods(Enum):
 class Dependency:
     def __init__(self, type_name, kwargs):
         self.name = "null"
-        self.language = None
+        self.version = 'none'
+        self.language = None # None means C-like
         self.is_found = False
         self.type_name = type_name
+        self.compile_args = []
+        self.link_args = []
+        self.sources = []
         method = DependencyMethods(kwargs.get('method', 'auto'))
 
         # Set the detection method. If the method is set to auto, use any available method.
@@ -74,10 +78,10 @@ class Dependency:
         return s.format(self.__class__.__name__, self.name, self.is_found)
 
     def get_compile_args(self):
-        return []
+        return self.compile_args
 
     def get_link_args(self):
-        return []
+        return self.link_args
 
     def found(self):
         return self.is_found
@@ -85,7 +89,7 @@ class Dependency:
     def get_sources(self):
         """Source files that need to be added to the target.
         As an example, gtest-all.cc when using GTest."""
-        return []
+        return self.sources
 
     def get_methods(self):
         return [DependencyMethods.AUTO]
@@ -93,6 +97,9 @@ class Dependency:
     def get_name(self):
         return self.name
 
+    def get_version(self):
+        return self.version
+
     def get_exe_args(self, compiler):
         return []
 
@@ -100,7 +107,7 @@ class Dependency:
         return False
 
     def get_pkgconfig_variable(self, variable_name):
-        raise MesonException('Tried to get a pkg-config variable from a non-pkgconfig dependency.')
+        raise NotImplementedError('{!r} is not a pkgconfig dependency'.format(self.name))
 
 
 class InternalDependency(Dependency):
@@ -115,41 +122,52 @@ class InternalDependency(Dependency):
         self.sources = sources
         self.ext_deps = ext_deps
 
-    def get_compile_args(self):
-        return self.compile_args
 
-    def get_link_args(self):
-        return self.link_args
+class ExternalDependency(Dependency):
+    def __init__(self, type_name, environment, language, kwargs):
+        super().__init__(type_name, kwargs)
+        self.env = environment
+        self.name = type_name # default
+        self.is_found = False
+        self.language = language
+        if language and language not in self.env.coredata.compilers:
+            m = self.name.capitalize() + ' requires a {} compiler'
+            raise DependencyException(m.format(language.capitalize()))
+        self.version_reqs = kwargs.get('version', None)
+        self.required = kwargs.get('required', True)
+        self.silent = kwargs.get('silent', False)
+        self.static = kwargs.get('static', False)
+        if not isinstance(self.static, bool):
+            raise DependencyException('Static keyword must be boolean')
+        # Is this dependency for cross-com,pilation?
+        if 'native' in kwargs and self.env.is_cross_build():
+            self.want_cross = not kwargs['native']
+        else:
+            self.want_cross = self.env.is_cross_build()
+        # Set the compiler that will be used by this dependency
+        # This is only used for configuration checks
+        if self.want_cross:
+            compilers = self.env.coredata.cross_compilers
+        else:
+            compilers = self.env.coredata.compilers
+        self.compiler = compilers.get(self.language or 'c', None)
 
-    def get_version(self):
-        return self.version
+    def get_compiler(self):
+        return self.compiler
 
 
-class PkgConfigDependency(Dependency):
+class PkgConfigDependency(ExternalDependency):
     # The class's copy of the pkg-config path. Avoids having to search for it
     # multiple times in the same Meson invocation.
     class_pkgbin = None
 
     def __init__(self, name, environment, kwargs):
-        Dependency.__init__(self, 'pkgconfig', kwargs)
+        super().__init__('pkgconfig', environment, None, kwargs)
+        self.name = name
         self.is_libtool = False
-        self.version_reqs = kwargs.get('version', None)
-        self.required = kwargs.get('required', True)
-        self.static = kwargs.get('static', False)
-        self.silent = kwargs.get('silent', False)
-        if not isinstance(self.static, bool):
-            raise DependencyException('Static keyword must be boolean')
         # Store a copy of the pkg-config path on the object itself so it is
         # stored in the pickled coredata and recovered.
         self.pkgbin = None
-        self.cargs = []
-        self.libs = []
-        if 'native' in kwargs and environment.is_cross_build():
-            self.want_cross = not kwargs['native']
-        else:
-            self.want_cross = environment.is_cross_build()
-        self.name = name
-        self.modversion = 'none'
 
         # When finding dependencies for cross-compiling, we don't care about
         # the 'native' pkg-config
@@ -175,7 +193,6 @@ class PkgConfigDependency(Dependency):
         else:
             self.pkgbin = PkgConfigDependency.class_pkgbin
 
-        self.is_found = False
         if not self.pkgbin:
             if self.required:
                 raise DependencyException('Pkg-config not found.')
@@ -187,7 +204,7 @@ class PkgConfigDependency(Dependency):
 
         mlog.debug('Determining dependency {!r} with pkg-config executable '
                    '{!r}'.format(name, self.pkgbin))
-        ret, self.modversion = self._call_pkgbin(['--modversion', name])
+        ret, self.version = self._call_pkgbin(['--modversion', name])
         if ret != 0:
             if self.required:
                 raise DependencyException('{} dependency {!r} not found'
@@ -202,10 +219,10 @@ class PkgConfigDependency(Dependency):
             if isinstance(self.version_reqs, str):
                 self.version_reqs = [self.version_reqs]
             (self.is_found, not_found, found) = \
-                version_compare_many(self.modversion, self.version_reqs)
+                version_compare_many(self.version, self.version_reqs)
             if not self.is_found:
                 found_msg += [mlog.red('NO'),
-                              'found {!r} but need:'.format(self.modversion),
+                              'found {!r} but need:'.format(self.version),
                               ', '.join(["'{}'".format(e) for e in not_found])]
                 if found:
                     found_msg += ['; matched:',
@@ -214,9 +231,9 @@ class PkgConfigDependency(Dependency):
                     mlog.log(*found_msg)
                 if self.required:
                     m = 'Invalid version of dependency, need {!r} {!r} found {!r}.'
-                    raise DependencyException(m.format(name, not_found, self.modversion))
+                    raise DependencyException(m.format(name, not_found, self.version))
                 return
-        found_msg += [mlog.green('YES'), self.modversion]
+        found_msg += [mlog.green('YES'), self.version]
         # Fetch cargs to be used while using this dependency
         self._set_cargs()
         # Fetch the libraries and library paths needed for using this
@@ -240,7 +257,7 @@ class PkgConfigDependency(Dependency):
         if ret != 0:
             raise DependencyException('Could not generate cargs for %s:\n\n%s' %
                                       (self.name, out))
-        self.cargs = out.split()
+        self.compile_args = out.split()
 
     def _set_libs(self):
         libcmd = [self.name, '--libs']
@@ -250,7 +267,7 @@ class PkgConfigDependency(Dependency):
         if ret != 0:
             raise DependencyException('Could not generate libs for %s:\n\n%s' %
                                       (self.name, out))
-        self.libs = []
+        self.link_args = []
         for lib in out.split():
             if lib.endswith(".la"):
                 shared_libname = self.extract_libtool_shlib(lib)
@@ -264,7 +281,7 @@ class PkgConfigDependency(Dependency):
                                               'library path' % lib)
                 lib = shared_lib
                 self.is_libtool = True
-            self.libs.append(lib)
+            self.link_args.append(lib)
 
     def get_pkgconfig_variable(self, variable_name):
         ret, out = self._call_pkgbin(['--variable=' + variable_name, self.name])
@@ -278,18 +295,6 @@ class PkgConfigDependency(Dependency):
         mlog.debug('Got pkgconfig variable %s : %s' % (variable_name, variable))
         return variable
 
-    def get_modversion(self):
-        return self.modversion
-
-    def get_version(self):
-        return self.modversion
-
-    def get_compile_args(self):
-        return self.cargs
-
-    def get_link_args(self):
-        return self.libs
-
     def get_methods(self):
         return [DependencyMethods.PKGCONFIG]
 
@@ -319,9 +324,6 @@ class PkgConfigDependency(Dependency):
                 mlog.log('Found Pkg-config:', mlog.red('NO'))
         return pkgbin
 
-    def found(self):
-        return self.is_found
-
     def extract_field(self, la_file, fieldname):
         with open(la_file) as f:
             for line in f:
@@ -500,52 +502,39 @@ class ExternalProgram:
         return self.name
 
 
-class ExternalLibrary(Dependency):
-    # TODO: Add `language` support to all Dependency objects so that languages
-    # can be exposed for dependencies that support that (i.e., not pkg-config)
-    def __init__(self, name, link_args, language, silent=False):
-        super().__init__('external', {})
+class ExternalLibrary(ExternalDependency):
+    def __init__(self, name, link_args, environment, language, silent=False):
+        super().__init__('external', environment, language, {})
         self.name = name
         self.language = language
         self.is_found = False
-        self.link_args = []
-        self.lang_args = []
         if link_args:
             self.is_found = True
             if not isinstance(link_args, list):
                 link_args = [link_args]
-            self.lang_args = {language: link_args}
-            # We special-case Vala for now till the Dependency object gets
-            # proper support for exposing the language it was written in.
-            # Without this, vala-specific link args will end up in the C link
-            # args list if you link to a Vala library.
-            # This hack use to be in CompilerHolder.find_library().
-            if language != 'vala':
-                self.link_args = link_args
+            self.link_args = link_args
         if not silent:
             if self.is_found:
                 mlog.log('Library', mlog.bold(name), 'found:', mlog.green('YES'))
             else:
                 mlog.log('Library', mlog.bold(name), 'found:', mlog.red('NO'))
 
-    def found(self):
-        return self.is_found
-
-    def get_name(self):
-        return self.name
-
-    def get_link_args(self):
+    def get_link_args(self, language=None):
+        '''
+        External libraries detected using a compiler must only be used with
+        compatible code. For instance, Vala libraries (.vapi files) cannot be
+        used with C code, and not all Rust library types can be linked with
+        C-like code. Note that C++ libraries *can* be linked with C code with
+        a C++ linker (and vice-versa).
+        '''
+        if self.language == 'vala' and language != 'vala':
+            return []
         return self.link_args
 
-    def get_lang_args(self, lang):
-        if lang in self.lang_args:
-            return self.lang_args[lang]
-        return []
-
 
-class ExtraFrameworkDependency(Dependency):
-    def __init__(self, name, required, path, kwargs):
-        Dependency.__init__(self, 'extraframeworks', kwargs)
+class ExtraFrameworkDependency(ExternalDependency):
+    def __init__(self, name, required, path, env, lang, kwargs):
+        super().__init__('extraframeworks', env, lang, kwargs)
         self.name = None
         self.required = required
         self.detect(name, path)
@@ -570,6 +559,7 @@ class ExtraFrameworkDependency(Dependency):
                     continue
                 self.path = p
                 self.name = d
+                self.is_found = True
                 return
         if not self.found() and self.required:
             raise DependencyException('Framework dependency %s not found.' % (name, ))
@@ -584,9 +574,6 @@ class ExtraFrameworkDependency(Dependency):
             return ['-F' + self.path, '-framework', self.name.split('.')[0]]
         return []
 
-    def found(self):
-        return self.name is not None
-
     def get_version(self):
         return 'unknown'
 
@@ -611,7 +598,7 @@ def get_dep_identifier(name, kwargs, want_cross):
     return identifier
 
 
-def find_external_dependency(name, environment, kwargs):
+def find_external_dependency(name, env, kwargs):
     required = kwargs.get('required', True)
     if not isinstance(required, bool):
         raise DependencyException('Keyword "required" must be a boolean.')
@@ -619,20 +606,20 @@ def find_external_dependency(name, environment, kwargs):
         raise DependencyException('Keyword "method" must be a string.')
     lname = name.lower()
     if lname in packages:
-        dep = packages[lname](environment, kwargs)
+        dep = packages[lname](env, 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, environment, kwargs)
+        pkgdep = PkgConfigDependency(name, env, kwargs)
         if pkgdep.found():
             return pkgdep
     except Exception as e:
         pkg_exc = e
     if mesonlib.is_osx():
-        fwdep = ExtraFrameworkDependency(name, required, None, kwargs)
+        fwdep = ExtraFrameworkDependency(name, required, None, env, kwargs)
         if required and not fwdep.found():
             m = 'Dependency {!r} not found, tried Extra Frameworks ' \
                 'and Pkg-Config:\n\n' + str(pkg_exc)
@@ -642,16 +629,3 @@ def find_external_dependency(name, environment, kwargs):
         raise pkg_exc
     mlog.log('Dependency', mlog.bold(name), 'found:', mlog.red('NO'))
     return pkgdep
-
-def dependency_get_compiler(language, environment, kwargs):
-    if 'native' in kwargs and environment.is_cross_build():
-        want_cross = not kwargs['native']
-    else:
-        want_cross = environment.is_cross_build()
-
-    if want_cross:
-        compilers = environment.coredata.cross_compilers
-    else:
-        compilers = environment.coredata.compilers
-
-    return compilers.get(language, None)
diff --git a/mesonbuild/dependencies/dev.py b/mesonbuild/dependencies/dev.py
index 76d6691..8d64379 100644
--- a/mesonbuild/dependencies/dev.py
+++ b/mesonbuild/dependencies/dev.py
@@ -22,29 +22,20 @@ import shutil
 from .. import mlog
 from .. import mesonlib
 from ..mesonlib import version_compare, Popen_safe
-from .base import Dependency, DependencyException, PkgConfigDependency, dependency_get_compiler
+from .base import DependencyException, ExternalDependency, PkgConfigDependency
 
-class GTestDependency(Dependency):
+class GTestDependency(ExternalDependency):
     def __init__(self, environment, kwargs):
-        Dependency.__init__(self, 'gtest', kwargs)
-        self.env = environment
+        super().__init__('gtest', environment, 'cpp', kwargs)
         self.main = kwargs.get('main', False)
-        self.name = 'gtest'
-        self.include_dir = '/usr/include'
         self.src_dirs = ['/usr/src/gtest/src', '/usr/src/googletest/googletest/src']
-
-        self.cpp_compiler = dependency_get_compiler('cpp', environment, kwargs)
-        if self.cpp_compiler is None:
-            raise DependencyException('Tried to use gtest but a C++ compiler is not defined.')
         self.detect()
 
-    def found(self):
-        return self.is_found
-
     def detect(self):
-        gtest_detect = self.cpp_compiler.find_library("gtest", self.env, [])
-        gtest_main_detect = self.cpp_compiler.find_library("gtest_main", self.env, [])
-        if gtest_detect and gtest_main_detect:
+        self.version = '1.something_maybe'
+        gtest_detect = self.compiler.find_library("gtest", self.env, [])
+        gtest_main_detect = self.compiler.find_library("gtest_main", self.env, [])
+        if gtest_detect and (not self.main or gtest_main_detect):
             self.is_found = True
             self.compile_args = []
             self.link_args = gtest_detect
@@ -64,7 +55,6 @@ class GTestDependency(Dependency):
         else:
             mlog.log('Dependency GTest found:', mlog.red('NO'))
             self.is_found = False
-        return self.is_found
 
     def detect_srcdir(self):
         for s in self.src_dirs:
@@ -78,37 +68,17 @@ class GTestDependency(Dependency):
                 return True
         return False
 
-    def get_compile_args(self):
-        arr = []
-        if self.include_dir != '/usr/include':
-            arr.append('-I' + self.include_dir)
-        if hasattr(self, 'src_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
-
     def need_threads(self):
         return True
 
 
-class GMockDependency(Dependency):
+class GMockDependency(ExternalDependency):
     def __init__(self, environment, kwargs):
-        Dependency.__init__(self, 'gmock', kwargs)
+        super().__init__('gmock', environment, 'cpp', kwargs)
+        self.version = '1.something_maybe'
         # GMock may be a library or just source.
         # Work with both.
-        self.name = 'gmock'
-        cpp_compiler = dependency_get_compiler('cpp', environment, kwargs)
-        if cpp_compiler is None:
-            raise DependencyException('Tried to use gmock but a C++ compiler is not defined.')
-        gmock_detect = cpp_compiler.find_library("gmock", environment, [])
+        gmock_detect = self.compiler.find_library("gmock", self.env, [])
         if gmock_detect:
             self.is_found = True
             self.compile_args = []
@@ -133,29 +103,12 @@ class GMockDependency(Dependency):
                     self.sources = [all_src]
                 mlog.log('Dependency GMock found:', mlog.green('YES'), '(building self)')
                 return
-
         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
-
-
-class LLVMDependency(Dependency):
-    """LLVM dependency.
 
+class LLVMDependency(ExternalDependency):
+    """
     LLVM uses a special tool, llvm-config, which has arguments for getting
     c args, cxx args, and ldargs as well as version.
     """
@@ -182,15 +135,11 @@ class LLVMDependency(Dependency):
     __cpp_blacklist = {'-DNDEBUG'}
 
     def __init__(self, environment, kwargs):
-        super().__init__('llvm-config', kwargs)
         # It's necessary for LLVM <= 3.8 to use the C++ linker. For 3.9 and 4.0
         # the C linker works fine if only using the C API.
-        self.language = 'cpp'
-        self.cargs = []
-        self.libs = []
+        super().__init__('llvm-config', environment, 'cpp', kwargs)
         self.modules = []
-
-        required = kwargs.get('required', True)
+        # FIXME: Support multiple version requirements ala PkgConfigDependency
         req_version = kwargs.get('version', None)
         if self.llvmconfig is None:
             self.check_llvmconfig(req_version)
@@ -201,14 +150,14 @@ class LLVMDependency(Dependency):
             else:
                 mlog.log("No llvm-config found; can't detect dependency")
             mlog.log('Dependency LLVM found:', mlog.red('NO'))
-            if required:
+            if self.required:
                 raise DependencyException('Dependency LLVM not found')
             return
 
         p, out, err = Popen_safe([self.llvmconfig, '--version'])
         if p.returncode != 0:
             mlog.debug('stdout: {}\nstderr: {}'.format(out, err))
-            if required:
+            if self.required:
                 raise DependencyException('Dependency LLVM not found')
             return
         else:
@@ -220,12 +169,13 @@ class LLVMDependency(Dependency):
                 [self.llvmconfig, '--libs', '--ldflags', '--system-libs'])[:2]
             if p.returncode != 0:
                 raise DependencyException('Could not generate libs for LLVM.')
-            self.libs = shlex.split(out)
+            self.link_args = shlex.split(out)
 
             p, out = Popen_safe([self.llvmconfig, '--cppflags'])[:2]
             if p.returncode != 0:
                 raise DependencyException('Could not generate includedir for LLVM.')
-            self.cargs = list(mesonlib.OrderedSet(shlex.split(out)).difference(self.__cpp_blacklist))
+            cargs = mesonlib.OrderedSet(shlex.split(out))
+            self.compile_args = list(cargs.difference(self.__cpp_blacklist))
 
             p, out = Popen_safe([self.llvmconfig, '--components'])[:2]
             if p.returncode != 0:
@@ -237,21 +187,12 @@ class LLVMDependency(Dependency):
             if mod not in self.modules:
                 mlog.log('LLVM module', mod, 'found:', mlog.red('NO'))
                 self.is_found = False
-                if required:
+                if self.required:
                     raise DependencyException(
                         'Could not find required LLVM Component: {}'.format(mod))
             else:
                 mlog.log('LLVM module', mod, 'found:', mlog.green('YES'))
 
-    def get_version(self):
-        return self.version
-
-    def get_compile_args(self):
-        return self.cargs
-
-    def get_link_args(self):
-        return self.libs
-
     @classmethod
     def check_llvmconfig(cls, version_req):
         """Try to find the highest version of llvm-config."""
@@ -288,8 +229,12 @@ class LLVMDependency(Dependency):
 
 
 class ValgrindDependency(PkgConfigDependency):
-    def __init__(self, environment, kwargs):
-        PkgConfigDependency.__init__(self, 'valgrind', environment, kwargs)
+    '''
+    Consumers of Valgrind usually only need the compile args and do not want to
+    link to its (static) libraries.
+    '''
+    def __init__(self, env, kwargs):
+        super().__init__('valgrind', env, None, kwargs)
 
     def get_link_args(self):
         return []
diff --git a/mesonbuild/dependencies/misc.py b/mesonbuild/dependencies/misc.py
index 6a76ba6..1356ec8 100644
--- a/mesonbuild/dependencies/misc.py
+++ b/mesonbuild/dependencies/misc.py
@@ -23,25 +23,19 @@ from .. import mlog
 from .. import mesonlib
 from ..environment import detect_cpu_family
 
-from .base import Dependency, DependencyException, DependencyMethods, ExtraFrameworkDependency, PkgConfigDependency
+from .base import DependencyException, DependencyMethods
+from .base import ExternalDependency, ExtraFrameworkDependency, PkgConfigDependency
 
 
-class BoostDependency(Dependency):
+class BoostDependency(ExternalDependency):
     # 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, environment, kwargs):
-        Dependency.__init__(self, 'boost', kwargs)
-        self.name = 'boost'
-        self.environment = environment
+        super().__init__('boost', environment, 'cpp', kwargs)
         self.libdir = ''
-        self.static = kwargs.get('static', False)
-        if 'native' in kwargs and environment.is_cross_build():
-            self.want_cross = not kwargs['native']
-        else:
-            self.want_cross = environment.is_cross_build()
         try:
             self.boost_root = os.environ['BOOST_ROOT']
             if not os.path.isabs(self.boost_root):
@@ -72,7 +66,7 @@ class BoostDependency(Dependency):
         self.detect_version()
         self.requested_modules = self.get_requested(kwargs)
         module_str = ', '.join(self.requested_modules)
-        if self.version is not None:
+        if self.is_found:
             self.detect_src_modules()
             self.detect_lib_modules()
             self.validate_requested()
@@ -83,9 +77,6 @@ class BoostDependency(Dependency):
             mlog.log('Dependency Boost (%s) found:' % module_str, mlog.green('YES'), info)
         else:
             mlog.log("Dependency Boost (%s) found:" % module_str, mlog.red('NO'))
-        if 'cpp' not in self.environment.coredata.compilers:
-            raise DependencyException('Tried to use Boost but a C++ compiler is not defined.')
-        self.cpp_compiler = self.environment.coredata.compilers['cpp']
 
     def detect_win_root(self):
         globtext = 'c:\\local\\boost_*'
@@ -130,7 +121,7 @@ class BoostDependency(Dependency):
         # names in order to handle cases like cross-compiling where we
         # might have a different sysroot.
         if not include_dir.endswith(('/usr/include', '/usr/local/include')):
-            args.append("".join(self.cpp_compiler.get_include_args(include_dir, True)))
+            args.append("".join(self.compiler.get_include_args(include_dir, True)))
         return args
 
     def get_requested(self, kwargs):
@@ -147,17 +138,10 @@ class BoostDependency(Dependency):
             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.boost_inc_subdir, 'version.hpp'))
         except FileNotFoundError:
-            self.version = None
             return
         with ifile:
             for line in ifile:
@@ -165,8 +149,8 @@ class BoostDependency(Dependency):
                     ver = line.split()[-1]
                     ver = ver[1:-1]
                     self.version = ver.replace('_', '.')
+                    self.is_found = True
                     return
-        self.version = None
 
     def detect_src_modules(self):
         for entry in os.listdir(self.boost_inc_subdir):
@@ -180,7 +164,7 @@ class BoostDependency(Dependency):
         return self.detect_lib_modules_nix()
 
     def detect_lib_modules_win(self):
-        arch = detect_cpu_family(self.environment.coredata.compilers)
+        arch = detect_cpu_family(self.env.coredata.compilers)
         # Guess the libdir
         if arch == 'x86':
             gl = 'lib32*'
@@ -254,10 +238,10 @@ class BoostDependency(Dependency):
             module = BoostDependency.name2lib.get(module, module)
             libname = 'boost_' + module
             # The compiler's library detector is the most reliable so use that first.
-            default_detect = self.cpp_compiler.find_library(libname, self.environment, [])
+            default_detect = self.compiler.find_library(libname, self.env, [])
             if default_detect is not None:
                 if module == 'unit_testing_framework':
-                    emon_args = self.cpp_compiler.find_library('boost_test_exec_monitor')
+                    emon_args = self.compiler.find_library('boost_test_exec_monitor')
                 else:
                     emon_args = None
                 args += default_detect
@@ -286,9 +270,9 @@ class BoostDependency(Dependency):
         return 'thread' in self.requested_modules
 
 
-class ThreadDependency(Dependency):
+class ThreadDependency(ExternalDependency):
     def __init__(self, environment, kwargs):
-        super().__init__('threads', {})
+        super().__init__('threads', environment, None, {})
         self.name = 'threads'
         self.is_found = True
         mlog.log('Dependency', mlog.bold(self.name), 'found:', mlog.green('YES'))
@@ -300,19 +284,18 @@ class ThreadDependency(Dependency):
         return 'unknown'
 
 
-class Python3Dependency(Dependency):
+class Python3Dependency(ExternalDependency):
     def __init__(self, environment, kwargs):
-        super().__init__('python3', kwargs)
+        super().__init__('python3', environment, None, kwargs)
         self.name = 'python3'
-        self.is_found = False
         # We can only be sure that it is Python 3 at this point
         self.version = '3'
         if DependencyMethods.PKGCONFIG in self.methods:
             try:
                 pkgdep = PkgConfigDependency('python3', environment, kwargs)
                 if pkgdep.found():
-                    self.cargs = pkgdep.cargs
-                    self.libs = pkgdep.libs
+                    self.compile_args = pkgdep.get_compile_args()
+                    self.link_args = pkgdep.get_link_args()
                     self.version = pkgdep.get_version()
                     self.is_found = True
                     return
@@ -324,10 +307,11 @@ class Python3Dependency(Dependency):
             elif mesonlib.is_osx() and DependencyMethods.EXTRAFRAMEWORK in self.methods:
                 # In OSX the Python 3 framework does not have a version
                 # number in its name.
-                fw = ExtraFrameworkDependency('python', False, None, kwargs)
+                fw = ExtraFrameworkDependency('python', False, None, self.env,
+                                              self.language, kwargs)
                 if fw.found():
-                    self.cargs = fw.get_compile_args()
-                    self.libs = fw.get_link_args()
+                    self.compile_args = fw.get_compile_args()
+                    self.link_args = fw.get_link_args()
                     self.is_found = True
         if self.is_found:
             mlog.log('Dependency', mlog.bold(self.name), 'found:', mlog.green('YES'))
@@ -359,23 +343,17 @@ class Python3Dependency(Dependency):
             return
         inc = sysconfig.get_path('include')
         platinc = sysconfig.get_path('platinclude')
-        self.cargs = ['-I' + inc]
+        self.compile_args = ['-I' + inc]
         if inc != platinc:
-            self.cargs.append('-I' + platinc)
+            self.compile_args.append('-I' + platinc)
         # Nothing exposes this directly that I coulf find
         basedir = sysconfig.get_config_var('base')
         vernum = sysconfig.get_config_var('py_version_nodot')
-        self.libs = ['-L{}/libs'.format(basedir),
-                     '-lpython{}'.format(vernum)]
+        self.link_args = ['-L{}/libs'.format(basedir),
+                          '-lpython{}'.format(vernum)]
         self.version = sysconfig.get_config_var('py_version_short')
         self.is_found = True
 
-    def get_compile_args(self):
-        return self.cargs
-
-    def get_link_args(self):
-        return self.libs
-
     def get_methods(self):
         if mesonlib.is_windows():
             return [DependencyMethods.PKGCONFIG, DependencyMethods.SYSCONFIG]
@@ -383,6 +361,3 @@ class Python3Dependency(Dependency):
             return [DependencyMethods.PKGCONFIG, DependencyMethods.EXTRAFRAMEWORK]
         else:
             return [DependencyMethods.PKGCONFIG]
-
-    def get_version(self):
-        return self.version
diff --git a/mesonbuild/dependencies/platform.py b/mesonbuild/dependencies/platform.py
index cd46412..95ab727 100644
--- a/mesonbuild/dependencies/platform.py
+++ b/mesonbuild/dependencies/platform.py
@@ -17,25 +17,21 @@
 
 from .. import mesonlib
 
-from .base import Dependency, DependencyException
+from .base import ExternalDependency, DependencyException
 
 
-class AppleFrameworks(Dependency):
-    def __init__(self, environment, kwargs):
-        Dependency.__init__(self, 'appleframeworks', kwargs)
+class AppleFrameworks(ExternalDependency):
+    def __init__(self, env, kwargs):
+        super().__init__('appleframeworks', env, None, kwargs)
         modules = kwargs.get('modules', [])
         if isinstance(modules, str):
             modules = [modules]
         if not modules:
             raise DependencyException("AppleFrameworks dependency requires at least one module.")
         self.frameworks = modules
-
-    def get_link_args(self):
-        args = []
+        # FIXME: Use self.compiler to check if the frameworks are available
         for f in self.frameworks:
-            args.append('-framework')
-            args.append(f)
-        return args
+            self.link_args += ['-framework', f]
 
     def found(self):
         return mesonlib.is_osx()
diff --git a/mesonbuild/dependencies/ui.py b/mesonbuild/dependencies/ui.py
index 3174176..7b276cc 100644
--- a/mesonbuild/dependencies/ui.py
+++ b/mesonbuild/dependencies/ui.py
@@ -26,24 +26,22 @@ from .. import mesonlib
 from ..mesonlib import MesonException, Popen_safe, version_compare
 from ..environment import for_windows
 
-from .base import (Dependency, DependencyException, DependencyMethods,
-                   ExternalProgram, ExtraFrameworkDependency, PkgConfigDependency)
+from .base import DependencyException, DependencyMethods
+from .base import ExternalDependency, ExternalProgram
+from .base import ExtraFrameworkDependency, PkgConfigDependency
 
 
-class GLDependency(Dependency):
+class GLDependency(ExternalDependency):
     def __init__(self, environment, kwargs):
-        Dependency.__init__(self, 'gl', kwargs)
-        self.is_found = False
-        self.cargs = []
-        self.linkargs = []
+        super().__init__('gl', environment, None, kwargs)
         if DependencyMethods.PKGCONFIG in self.methods:
             try:
                 pcdep = PkgConfigDependency('gl', environment, kwargs)
                 if pcdep.found():
                     self.type_name = 'pkgconfig'
                     self.is_found = True
-                    self.cargs = pcdep.get_compile_args()
-                    self.linkargs = pcdep.get_link_args()
+                    self.compile_args = pcdep.get_compile_args()
+                    self.link_args = pcdep.get_link_args()
                     self.version = pcdep.get_version()
                     return
             except Exception:
@@ -51,21 +49,19 @@ class GLDependency(Dependency):
         if DependencyMethods.SYSTEM in self.methods:
             if mesonlib.is_osx():
                 self.is_found = True
-                self.linkargs = ['-framework', 'OpenGL']
-                self.version = '1'  # FIXME
+                # FIXME: Use AppleFrameworks dependency
+                self.link_args = ['-framework', 'OpenGL']
+                # FIXME: Detect version using self.compiler
+                self.version = '1'
                 return
             if mesonlib.is_windows():
                 self.is_found = True
-                self.linkargs = ['-lopengl32']
-                self.version = '1'  # FIXME: unfixable?
+                # FIXME: Use self.compiler.find_library()
+                self.link_args = ['-lopengl32']
+                # FIXME: Detect version using self.compiler
+                self.version = '1'
                 return
 
-    def get_link_args(self):
-        return self.linkargs
-
-    def get_version(self):
-        return self.version
-
     def get_methods(self):
         if mesonlib.is_osx() or mesonlib.is_windows():
             return [DependencyMethods.PKGCONFIG, DependencyMethods.SYSTEM]
@@ -73,10 +69,9 @@ class GLDependency(Dependency):
             return [DependencyMethods.PKGCONFIG]
 
 
-class GnuStepDependency(Dependency):
+class GnuStepDependency(ExternalDependency):
     def __init__(self, environment, kwargs):
-        Dependency.__init__(self, 'gnustep', kwargs)
-        self.required = kwargs.get('required', True)
+        super().__init__('gnustep', environment, 'objc', kwargs)
         self.modules = kwargs.get('modules', [])
         self.detect()
 
@@ -85,11 +80,9 @@ class GnuStepDependency(Dependency):
         try:
             gp = Popen_safe([self.confprog, '--help'])[0]
         except (FileNotFoundError, PermissionError):
-            self.args = None
             mlog.log('Dependency GnuStep found:', mlog.red('NO'), '(no gnustep-config)')
             return
         if gp.returncode != 0:
-            self.args = None
             mlog.log('Dependency GnuStep found:', mlog.red('NO'))
             return
         if 'gui' in self.modules:
@@ -100,12 +93,13 @@ class GnuStepDependency(Dependency):
         if fp.returncode != 0:
             raise DependencyException('Error getting objc-args: %s %s' % (flagtxt, flagerr))
         args = flagtxt.split()
-        self.args = self.filter_arsg(args)
+        self.compile_args = self.filter_args(args)
         fp, libtxt, liberr = Popen_safe([self.confprog, arg])
         if fp.returncode != 0:
             raise DependencyException('Error getting objc-lib args: %s %s' % (libtxt, liberr))
-        self.libs = self.weird_filter(libtxt.split())
+        self.link_args = self.weird_filter(libtxt.split())
         self.version = self.detect_version()
+        self.is_found = True
         mlog.log('Dependency', mlog.bold('GnuStep'), 'found:',
                  mlog.green('YES'), self.version)
 
@@ -115,7 +109,7 @@ 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):
+    def filter_args(self, args):
         """gnustep-config returns a bunch of garbage args such
         as -O2 and so on. Drop everything that is not needed."""
         result = []
@@ -157,25 +151,10 @@ why. As a hack filter out everything that is not a flag."""
                                       ''.format(self.confprog, var))
         return o.strip()
 
-    def found(self):
-        return self.args is not None
-
-    def get_version(self):
-        return self.version
-
-    def get_compile_args(self):
-        if self.args is None:
-            return []
-        return self.args
-
-    def get_link_args(self):
-        return self.libs
 
-
-class QtBaseDependency(Dependency):
+class QtBaseDependency(ExternalDependency):
     def __init__(self, name, env, kwargs):
-        Dependency.__init__(self, name, kwargs)
-        self.name = name
+        super().__init__(name, env, 'cpp', kwargs)
         self.qtname = name.capitalize()
         self.qtver = name[-1]
         if self.qtver == "4":
@@ -184,16 +163,7 @@ class QtBaseDependency(Dependency):
             self.qtpkgname = self.qtname
         self.root = '/usr'
         self.bindir = None
-        self.silent = kwargs.get('silent', False)
-        # We store the value of required here instead of passing it on to
-        # PkgConfigDependency etc because we want to try the qmake-based
-        # fallback as well.
-        self.required = kwargs.pop('required', True)
-        kwargs['required'] = False
         mods = kwargs.get('modules', [])
-        self.cargs = []
-        self.largs = []
-        self.is_found = False
         if isinstance(mods, str):
             mods = [mods]
         if not mods:
@@ -207,16 +177,16 @@ class QtBaseDependency(Dependency):
         methods = []
         # Prefer pkg-config, then fallback to `qmake -query`
         if DependencyMethods.PKGCONFIG in self.methods:
-            self._pkgconfig_detect(mods, env, kwargs)
+            self._pkgconfig_detect(mods, kwargs)
             methods.append('pkgconfig')
         if not self.is_found and DependencyMethods.QMAKE in self.methods:
-            from_text = self._qmake_detect(mods, env, kwargs)
+            from_text = self._qmake_detect(mods, kwargs)
             methods.append('qmake-' + self.name)
             methods.append('qmake')
         if not self.is_found:
             # Reset compile args and link args
-            self.cargs = []
-            self.largs = []
+            self.compile_args = []
+            self.link_args = []
             from_text = '(checked {})'.format(mlog.format_list(methods))
             self.version = 'none'
             if self.required:
@@ -244,24 +214,27 @@ class QtBaseDependency(Dependency):
             rcc = ExternalProgram('rcc-' + self.name, silent=True)
         return moc, uic, rcc
 
-    def _pkgconfig_detect(self, mods, env, kwargs):
+    def _pkgconfig_detect(self, mods, kwargs):
+        # We set the value of required to False so that we can try the
+        # qmake-based fallback if pkg-config fails.
+        kwargs['required'] = False
         modules = OrderedDict()
         for module in mods:
-            modules[module] = PkgConfigDependency(self.qtpkgname + module, env, kwargs)
-        self.is_found = True
+            modules[module] = PkgConfigDependency(self.qtpkgname + module, self.env, kwargs)
         for m in modules.values():
             if not m.found():
                 self.is_found = False
                 return
-            self.cargs += m.get_compile_args()
-            self.largs += m.get_link_args()
-        self.version = m.modversion
+            self.compile_args += m.get_compile_args()
+            self.link_args += m.get_link_args()
+        self.is_found = True
+        self.version = m.version
         # Try to detect moc, uic, rcc
         if 'Core' in modules:
             core = modules['Core']
         else:
             corekwargs = {'required': 'false', 'silent': 'true'}
-            core = PkgConfigDependency(self.qtpkgname + 'Core', env, corekwargs)
+            core = PkgConfigDependency(self.qtpkgname + 'Core', self.env, corekwargs)
         # Used by self.compilers_detect()
         self.bindir = self.get_pkgconfig_host_bins(core)
         if not self.bindir:
@@ -270,16 +243,16 @@ class QtBaseDependency(Dependency):
             if prefix:
                 self.bindir = os.path.join(prefix, 'bin')
 
-    def _find_qmake(self, qmake, env):
+    def _find_qmake(self, qmake):
         # Even when cross-compiling, if we don't get a cross-info qmake, we
         # fallback to using the qmake in PATH because that's what we used to do
-        if env.is_cross_build():
-            qmake = env.cross_info.config['binaries'].get('qmake', qmake)
+        if self.env.is_cross_build():
+            qmake = self.env.cross_info.config['binaries'].get('qmake', qmake)
         return ExternalProgram(qmake, silent=True)
 
-    def _qmake_detect(self, mods, env, kwargs):
+    def _qmake_detect(self, mods, kwargs):
         for qmake in ('qmake-' + self.name, 'qmake'):
-            self.qmake = self._find_qmake(qmake, env)
+            self.qmake = self._find_qmake(qmake)
             if not self.qmake.found():
                 continue
             # Check that the qmake is for qt5
@@ -293,6 +266,7 @@ class QtBaseDependency(Dependency):
             break
         else:
             # Didn't find qmake :(
+            self.is_found = False
             return
         self.version = re.search(self.qtver + '(\.\d+)+', stdo).group(0)
         # Query library path, header path, and binary path
@@ -308,15 +282,15 @@ class QtBaseDependency(Dependency):
         if mesonlib.is_osx():
             return self._framework_detect(qvars, mods, kwargs)
         incdir = qvars['QT_INSTALL_HEADERS']
-        self.cargs.append('-I' + incdir)
+        self.compile_args.append('-I' + incdir)
         libdir = qvars['QT_INSTALL_LIBS']
         # Used by self.compilers_detect()
         self.bindir = self.get_qmake_host_bins(qvars)
         self.is_found = True
         for module in mods:
             mincdir = os.path.join(incdir, 'Qt' + module)
-            self.cargs.append('-I' + mincdir)
-            if for_windows(env.is_cross_build(), env):
+            self.compile_args.append('-I' + mincdir)
+            if for_windows(self.env.is_cross_build(), self.env):
                 libfile = os.path.join(libdir, self.qtpkgname + module + '.lib')
                 if not os.path.isfile(libfile):
                     # MinGW can link directly to .dll
@@ -329,7 +303,7 @@ class QtBaseDependency(Dependency):
                 if not os.path.isfile(libfile):
                     self.is_found = False
                     break
-            self.largs.append(libfile)
+            self.link_args.append(libfile)
         return qmake
 
     def _framework_detect(self, qvars, modules, kwargs):
@@ -340,8 +314,8 @@ class QtBaseDependency(Dependency):
             self.cargs.append('-F' + libdir)
             if fwdep.found():
                 self.is_found = True
-                self.cargs += fwdep.get_compile_args()
-                self.largs += fwdep.get_link_args()
+                self.compile_args += fwdep.get_compile_args()
+                self.link_args += fwdep.get_link_args()
         # Used by self.compilers_detect()
         self.bindir = self.get_qmake_host_bins(qvars)
 
@@ -353,24 +327,9 @@ class QtBaseDependency(Dependency):
         else:
             return qvars['QT_INSTALL_BINS']
 
-    def get_version(self):
-        return self.version
-
-    def get_compile_args(self):
-        return self.cargs
-
-    def get_sources(self):
-        return []
-
-    def get_link_args(self):
-        return self.largs
-
     def get_methods(self):
         return [DependencyMethods.PKGCONFIG, DependencyMethods.QMAKE]
 
-    def found(self):
-        return self.is_found
-
     def get_exe_args(self, compiler):
         # Originally this was -fPIE but nowadays the default
         # for upstream and distros seems to be -reduce-relocations
@@ -408,20 +367,18 @@ class Qt5Dependency(QtBaseDependency):
 
 # There are three different ways of depending on SDL2:
 # sdl2-config, pkg-config and OSX framework
-class SDL2Dependency(Dependency):
+class SDL2Dependency(ExternalDependency):
     def __init__(self, environment, kwargs):
-        Dependency.__init__(self, 'sdl2', kwargs)
-        self.is_found = False
-        self.cargs = []
-        self.linkargs = []
+        super().__init__('sdl2', environment, None, kwargs)
         if DependencyMethods.PKGCONFIG in self.methods:
             try:
+                kwargs['required'] = False
                 pcdep = PkgConfigDependency('sdl2', environment, kwargs)
                 if pcdep.found():
                     self.type_name = 'pkgconfig'
                     self.is_found = True
-                    self.cargs = pcdep.get_compile_args()
-                    self.linkargs = pcdep.get_link_args()
+                    self.compile_args = pcdep.get_compile_args()
+                    self.link_args = pcdep.get_link_args()
                     self.version = pcdep.get_version()
                     return
             except Exception as e:
@@ -431,9 +388,9 @@ class SDL2Dependency(Dependency):
             sdlconf = shutil.which('sdl2-config')
             if sdlconf:
                 stdo = Popen_safe(['sdl2-config', '--cflags'])[1]
-                self.cargs = stdo.strip().split()
+                self.compile_args = stdo.strip().split()
                 stdo = Popen_safe(['sdl2-config', '--libs'])[1]
-                self.linkargs = stdo.strip().split()
+                self.link_args = stdo.strip().split()
                 stdo = Popen_safe(['sdl2-config', '--version'])[1]
                 self.version = stdo.strip()
                 self.is_found = True
@@ -443,27 +400,15 @@ class SDL2Dependency(Dependency):
             mlog.debug('Could not find sdl2-config binary, trying next.')
         if DependencyMethods.EXTRAFRAMEWORK in self.methods:
             if mesonlib.is_osx():
-                fwdep = ExtraFrameworkDependency('sdl2', kwargs.get('required', True), None, kwargs)
+                fwdep = ExtraFrameworkDependency('sdl2', False, None, kwargs)
                 if fwdep.found():
                     self.is_found = True
-                    self.cargs = fwdep.get_compile_args()
-                    self.linkargs = fwdep.get_link_args()
+                    self.compile_args = fwdep.get_compile_args()
+                    self.link_args = fwdep.get_link_args()
                     self.version = '2'  # FIXME
                     return
             mlog.log('Dependency', mlog.bold('sdl2'), 'found:', mlog.red('NO'))
 
-    def get_compile_args(self):
-        return self.cargs
-
-    def get_link_args(self):
-        return self.linkargs
-
-    def found(self):
-        return self.is_found
-
-    def get_version(self):
-        return self.version
-
     def get_methods(self):
         if mesonlib.is_osx():
             return [DependencyMethods.PKGCONFIG, DependencyMethods.SDLCONFIG, DependencyMethods.EXTRAFRAMEWORK]
@@ -471,14 +416,12 @@ class SDL2Dependency(Dependency):
             return [DependencyMethods.PKGCONFIG, DependencyMethods.SDLCONFIG]
 
 
-class WxDependency(Dependency):
+class WxDependency(ExternalDependency):
     wx_found = None
 
     def __init__(self, environment, kwargs):
-        Dependency.__init__(self, 'wx', kwargs)
-        self.is_found = False
-        # FIXME: use version instead of modversion
-        self.modversion = 'none'
+        super().__init__('wx', environment, None, kwargs)
+        self.version = 'none'
         if WxDependency.wx_found is None:
             self.check_wxconfig()
         if not WxDependency.wx_found:
@@ -490,15 +433,14 @@ class WxDependency(Dependency):
         p, out = Popen_safe([self.wxc, '--version'])[0:2]
         if p.returncode != 0:
             mlog.log('Dependency wxwidgets found:', mlog.red('NO'))
-            self.cargs = []
-            self.libs = []
         else:
-            self.modversion = out.strip()
+            self.version = out.strip()
+            # FIXME: Support multiple version reqs like PkgConfigDependency
             version_req = kwargs.get('version', None)
             if version_req is not None:
-                if not version_compare(self.modversion, version_req, strict=True):
+                if not version_compare(self.version, version_req, strict=True):
                     mlog.log('Wxwidgets version %s does not fullfill requirement %s' %
-                             (self.modversion, version_req))
+                             (self.version, version_req))
                     return
             mlog.log('Dependency wxwidgets found:', mlog.green('YES'))
             self.is_found = True
@@ -509,13 +451,13 @@ class WxDependency(Dependency):
             # FIXME: this error should only be raised if required is true
             if p.returncode != 0:
                 raise DependencyException('Could not generate cargs for wxwidgets.')
-            self.cargs = out.split()
+            self.compile_args = out.split()
 
             # FIXME: this error should only be raised if required is true
             p, out = Popen_safe([self.wxc, '--libs'] + self.requested_modules)[0:2]
             if p.returncode != 0:
                 raise DependencyException('Could not generate libs for wxwidgets.')
-            self.libs = out.split()
+            self.link_args = out.split()
 
     def get_requested(self, kwargs):
         modules = 'modules'
@@ -529,18 +471,6 @@ class WxDependency(Dependency):
                 raise DependencyException('wxwidgets module argument is not a string.')
         return candidates
 
-    def get_modversion(self):
-        return self.modversion
-
-    def get_version(self):
-        return self.modversion
-
-    def get_compile_args(self):
-        return self.cargs
-
-    def get_link_args(self):
-        return self.libs
-
     def check_wxconfig(self):
         for wxc in ['wx-config-3.0', 'wx-config']:
             try:
@@ -555,6 +485,3 @@ class WxDependency(Dependency):
                 pass
         WxDependency.wxconfig_found = False
         mlog.log('Found wx-config:', mlog.red('NO'))
-
-    def found(self):
-        return self.is_found