Merge pull request #3486 from Salamandar/salamandar/meson_version_introspection

Add FeatureNew and FeatureDeprecated, to alert the user of bad meson_version

14 files changed, 276 insertions, 6 deletions

diff --git a/mesonbuild/build.py b/mesonbuild/build.py
index b6399bb..0bcb98f 100644
--- a/mesonbuild/build.py
+++ b/mesonbuild/build.py
@@ -25,6 +25,7 @@ from .mesonlib import typeslistify, stringlistify, classify_unity_sources
 from .mesonlib import get_filenames_templates_dict, substitute_values
 from .mesonlib import for_windows, for_darwin, for_cygwin, for_android, has_path_sep
 from .compilers import is_object, clike_langs, sort_clike, lang_suffixes
+from .interpreterbase import FeatureNew, FeatureNewKwargs
 
 pch_kwargs = set(['c_pch', 'cpp_pch'])
 
@@ -330,6 +331,9 @@ a hard error in the future.''' % name)
             myid = subdir_part + '@@' + myid
         return myid
 
+    @FeatureNewKwargs('build target', '0.42.0', ['rust_crate_type', 'build_rpath', 'implicit_include_directories'])
+    @FeatureNewKwargs('build target', '0.41.0', ['rust_args'])
+    @FeatureNewKwargs('build target', '0.40.0', ['build_by_default'])
     def process_kwargs(self, kwargs):
         if 'build_by_default' in kwargs:
             self.build_by_default = kwargs['build_by_default']
@@ -1082,6 +1086,7 @@ recommended as it can lead to undefined behaviour on some platforms''')
                 return
 
 class Generator:
+    @FeatureNewKwargs('generator', '0.43.0', 'capture')
     def __init__(self, args, kwargs):
         if len(args) != 1:
             raise InvalidArguments('Generator requires exactly one positional argument: the executable')
@@ -1763,6 +1768,9 @@ class CustomTarget(Target):
                 if 'install_dir' not in kwargs:
                     raise InvalidArguments('"install_dir" must be specified '
                                            'when installing a target')
+
+                if isinstance(kwargs['install_dir'], list):
+                    FeatureNew('multiple install_dir for custom_target', '0.40.0').use()
                 # If an item in this list is False, the output corresponding to
                 # the list index of that item will not be installed
                 self.install_dir = typeslistify(kwargs['install_dir'], (str, bool))
diff --git a/mesonbuild/dependencies/misc.py b/mesonbuild/dependencies/misc.py
index cf84123..a628151 100644
--- a/mesonbuild/dependencies/misc.py
+++ b/mesonbuild/dependencies/misc.py
@@ -31,8 +31,11 @@ from .base import (
     ConfigToolDependency,
 )
 
+from ..interpreterbase import FeatureNew
 
 class MPIDependency(ExternalDependency):
+
+    @FeatureNew('MPI Dependency', '0.42.0')
     def __init__(self, environment, kwargs):
         language = kwargs.get('language', 'c')
         super().__init__('mpi', environment, language, kwargs)
@@ -249,6 +252,7 @@ class OpenMPDependency(ExternalDependency):
         '199810': '1.0',
     }
 
+    @FeatureNew('OpenMP Dependency', '0.46.0')
     def __init__(self, environment, kwargs):
         language = kwargs.get('language')
         super().__init__('openmp', environment, language, kwargs)
@@ -428,6 +432,8 @@ class Python3Dependency(ExternalDependency):
 
 
 class PcapDependency(ExternalDependency):
+
+    @FeatureNew('Pcap Dependency', '0.42.0')
     def __init__(self, environment, kwargs):
         super().__init__('pcap', environment, None, kwargs)
 
diff --git a/mesonbuild/dependencies/ui.py b/mesonbuild/dependencies/ui.py
index d6547ff..b07b0ae 100644
--- a/mesonbuild/dependencies/ui.py
+++ b/mesonbuild/dependencies/ui.py
@@ -33,6 +33,7 @@ from .base import ExternalDependency, ExternalProgram
 from .base import ExtraFrameworkDependency, PkgConfigDependency
 from .base import ConfigToolDependency
 
+from ..interpreterbase import FeatureNew
 
 class GLDependency(ExternalDependency):
     def __init__(self, environment, kwargs):
@@ -514,6 +515,8 @@ class WxDependency(ConfigToolDependency):
 
 
 class VulkanDependency(ExternalDependency):
+
+    @FeatureNew('Vulkan Dependency', '0.42.0')
     def __init__(self, environment, kwargs):
         super().__init__('vulkan', environment, None, kwargs)
 
diff --git a/mesonbuild/interpreter.py b/mesonbuild/interpreter.py
index d2238d7..93fd237 100644
--- a/mesonbuild/interpreter.py
+++ b/mesonbuild/interpreter.py
@@ -28,6 +28,7 @@ from .interpreterbase import InterpreterBase
 from .interpreterbase import check_stringlist, flatten, noPosargs, noKwargs, stringArgs, permittedKwargs, noArgsFlattening
 from .interpreterbase import InterpreterException, InvalidArguments, InvalidCode, SubdirDoneRequest
 from .interpreterbase import InterpreterObject, MutableInterpreterObject, Disabler
+from .interpreterbase import FeatureNew, FeatureDeprecated, FeatureNewKwargs
 from .modules import ModuleReturnValue
 
 import os, sys, shutil, uuid
@@ -259,6 +260,7 @@ This will become a hard error in the future''')
     def has_method(self, args, kwargs):
         return args[0] in self.held_object.values
 
+    @FeatureNew('configuration_data.get()', '0.38.0')
     @noArgsFlattening
     def get_method(self, args, kwargs):
         if len(args) < 1 or len(args) > 2:
@@ -270,6 +272,7 @@ This will become a hard error in the future''')
             return args[1]
         raise InterpreterException('Entry %s not in configuration data.' % name)
 
+    @FeatureNew('get_unquoted', '0.44.0')
     def get_unquoted_method(self, args, kwargs):
         if len(args) < 1 or len(args) > 2:
             raise InterpreterException('Get method takes one or two arguments.')
@@ -342,6 +345,7 @@ class DependencyHolder(InterpreterObject, ObjectHolder):
             raise InterpreterException('Variable name must be a string.')
         return self.held_object.get_pkgconfig_variable(varname, kwargs)
 
+    @FeatureNew('get_configtool_variable', '0.44.0')
     @permittedKwargs({})
     def configtool_method(self, args, kwargs):
         args = listify(args)
@@ -352,6 +356,7 @@ class DependencyHolder(InterpreterObject, ObjectHolder):
             raise InterpreterException('Variable name must be a string.')
         return self.held_object.get_configtool_variable(varname)
 
+    @FeatureNew('dep.partial_dependency', '0.46.0')
     @noPosargs
     @permittedKwargs(permitted_method_kwargs['partial_dependency'])
     def partial_dependency_method(self, args, kwargs):
@@ -376,6 +381,7 @@ class InternalDependencyHolder(InterpreterObject, ObjectHolder):
     def version_method(self, args, kwargs):
         return self.held_object.get_version()
 
+    @FeatureNew('dep.partial_dependency', '0.46.0')
     @noPosargs
     @permittedKwargs(permitted_method_kwargs['partial_dependency'])
     def partial_dependency_method(self, args, kwargs):
@@ -435,6 +441,7 @@ class ExternalLibraryHolder(InterpreterObject, ObjectHolder):
     def get_exe_args(self):
         return self.held_object.get_exe_args()
 
+    @FeatureNew('dep.partial_dependency', '0.46.0')
     @noPosargs
     @permittedKwargs(permitted_method_kwargs['partial_dependency'])
     def partial_dependency_method(self, args, kwargs):
@@ -447,6 +454,7 @@ class GeneratorHolder(InterpreterObject, ObjectHolder):
         ObjectHolder.__init__(self, build.Generator(args, kwargs))
         self.methods.update({'process': self.process_method})
 
+    @FeatureNewKwargs('generator.process', '0.45.0', ['preserve_path_from'])
     @permittedKwargs({'extra_args', 'preserve_path_from'})
     def process_method(self, args, kwargs):
         extras = mesonlib.stringlistify(kwargs.get('extra_args', []))
@@ -685,6 +693,7 @@ class BuildTargetHolder(TargetHolder):
         gobjs = self.held_object.extract_objects(args)
         return GeneratedObjectsHolder(gobjs)
 
+    @FeatureNewKwargs('extract_all_objects', '0.46.0', ['recursive'])
     @noPosargs
     @permittedKwargs({'recursive'})
     def extract_all_objects_method(self, args, kwargs):
@@ -1095,6 +1104,7 @@ class CompilerHolder(InterpreterObject):
         mlog.log('Checking for type "', mlog.bold(typename), '": ', hadtxt, sep='')
         return had
 
+    @FeatureNew('compiler.compute_int', '0.40.0')
     @permittedKwargs({
         'prefix',
         'low',
@@ -1149,6 +1159,7 @@ class CompilerHolder(InterpreterObject):
         mlog.log('Checking for size of "%s": %d' % (element, esize))
         return esize
 
+    @FeatureNew('compiler.get_define', '0.40.0')
     @permittedKwargs({
         'prefix',
         'no_builtin_args',
@@ -1230,6 +1241,7 @@ class CompilerHolder(InterpreterObject):
             mlog.log('Checking if "', mlog.bold(testname), '" links: ', h, sep='')
         return result
 
+    @FeatureNew('check_header', '0.47.0')
     @permittedKwargs({
         'prefix',
         'no_builtin_args',
@@ -1352,6 +1364,7 @@ class CompilerHolder(InterpreterObject):
             h)
         return result
 
+    @FeatureNew('compiler.get_supported_arguments', '0.43.0')
     @permittedKwargs({})
     def get_supported_arguments_method(self, args, kwargs):
         args = mesonlib.stringlistify(args)
@@ -1370,6 +1383,7 @@ class CompilerHolder(InterpreterObject):
         mlog.log('First supported argument:', mlog.red('None'))
         return []
 
+    @FeatureNew('has_link_argument', '0.46.0')
     @permittedKwargs({})
     def has_link_argument_method(self, args, kwargs):
         args = mesonlib.stringlistify(args)
@@ -1377,6 +1391,7 @@ class CompilerHolder(InterpreterObject):
             raise InterpreterException('has_link_argument takes exactly one argument.')
         return self.has_multi_link_arguments_method(args, kwargs)
 
+    @FeatureNew('has_multi_link_argument', '0.46.0')
     @permittedKwargs({})
     def has_multi_link_arguments_method(self, args, kwargs):
         args = mesonlib.stringlistify(args)
@@ -1391,6 +1406,7 @@ class CompilerHolder(InterpreterObject):
             h)
         return result
 
+    @FeatureNew('get_supported_link_arguments_method', '0.46.0')
     @permittedKwargs({})
     def get_supported_link_arguments_method(self, args, kwargs):
         args = mesonlib.stringlistify(args)
@@ -1400,6 +1416,7 @@ class CompilerHolder(InterpreterObject):
                 supported_args.append(arg)
         return supported_args
 
+    @FeatureNew('first_supported_link_argument_method', '0.46.0')
     @permittedKwargs({})
     def first_supported_link_argument_method(self, args, kwargs):
         for i in mesonlib.stringlistify(args):
@@ -1619,6 +1636,7 @@ class MesonMain(InterpreterObject):
             raise InterpreterException('Argument must be a string.')
         self.build.dep_manifest_name = args[0]
 
+    @FeatureNew('override_find_program', '0.46.0')
     @permittedKwargs({})
     def override_find_program_method(self, args, kwargs):
         if len(args) != 2:
@@ -1645,6 +1663,7 @@ class MesonMain(InterpreterObject):
     def project_version_method(self, args, kwargs):
         return self.build.dep_manifest[self.interpreter.active_projectname]['version']
 
+    @FeatureNew('meson.project_license()', '0.45.0')
     @noPosargs
     @permittedKwargs({})
     def project_license_method(self, args, kwargs):
@@ -1935,6 +1954,7 @@ class Interpreter(InterpreterBase):
     def func_files(self, node, args, kwargs):
         return [mesonlib.File.from_source_file(self.environment.source_dir, self.subdir, fname) for fname in args]
 
+    @FeatureNewKwargs('declare_dependency', '0.46.0', ['link_whole'])
     @permittedKwargs(permitted_kwargs['declare_dependency'])
     @noPosargs
     def func_declare_dependency(self, node, args, kwargs):
@@ -1990,6 +2010,7 @@ external dependencies (including libraries) must go to "dependencies".''')
                 if not isinstance(actual, wanted):
                     raise InvalidArguments('Incorrect argument type.')
 
+    @FeatureNewKwargs('run_command', '0.47.0', ['check'])
     @permittedKwargs(permitted_kwargs['run_command'])
     def func_run_command(self, node, args, kwargs):
         return self.run_command_impl(node, args, kwargs)
@@ -2067,6 +2088,7 @@ external dependencies (including libraries) must go to "dependencies".''')
     def func_option(self, nodes, args, kwargs):
         raise InterpreterException('Tried to call option() in build description file. All options must be in the option file.')
 
+    @FeatureNewKwargs('subproject', '0.38.0', ['default_options'])
     @permittedKwargs(permitted_kwargs['subproject'])
     @stringArgs
     def func_subproject(self, nodes, args, kwargs):
@@ -2285,6 +2307,7 @@ to directly access options of other subprojects.''')
         if 'meson_version' in kwargs:
             cv = coredata.version
             pv = kwargs['meson_version']
+            mesonlib.target_version = pv
             if not mesonlib.version_compare(cv, pv):
                 raise InterpreterException('Meson version is %s but project requires %s.' % (cv, pv))
         self.build.projects[self.subproject] = proj_name
@@ -2328,6 +2351,7 @@ to directly access options of other subprojects.''')
         argstr = self.get_message_string_arg(node)
         mlog.log(mlog.bold('Message:'), argstr)
 
+    @FeatureNew('warning()', '0.44.0')
     @noKwargs
     def func_warning(self, node, args, kwargs):
         argstr = self.get_message_string_arg(node)
@@ -2651,6 +2675,8 @@ to directly access options of other subprojects.''')
                                       'dep {}'.format(found, dirname, wanted, name))
         return None
 
+    @FeatureNewKwargs('dependency', '0.40.0', ['method'])
+    @FeatureNewKwargs('dependency', '0.38.0', ['default_options'])
     @permittedKwargs(permitted_kwargs['dependency'])
     def func_dependency(self, node, args, kwargs):
         self.validate_arguments(args, 1, [str])
@@ -2715,6 +2741,7 @@ to directly access options of other subprojects.''')
             self.coredata.deps[identifier] = dep
         return DependencyHolder(dep)
 
+    @FeatureNew('disabler', '0.44.0')
     @noKwargs
     @noPosargs
     def func_disabler(self, node, args, kwargs):
@@ -2797,6 +2824,7 @@ root and issuing %s.
                  mlog.bold(subproj_path), 'found:', mlog.green('YES'))
         return dep
 
+    @FeatureNewKwargs('executable', '0.42.0', 'implib')
     @permittedKwargs(permitted_kwargs['executable'])
     def func_executable(self, node, args, kwargs):
         return self.build_target(node, args, kwargs, ExecutableHolder)
@@ -2815,6 +2843,7 @@ root and issuing %s.
     def func_both_lib(self, node, args, kwargs):
         return self.build_both_libraries(node, args, kwargs)
 
+    @FeatureNew('Shared Modules', '0.37.0')
     @permittedKwargs(permitted_kwargs['shared_module'])
     def func_shared_module(self, node, args, kwargs):
         return self.build_target(node, args, kwargs, SharedModuleHolder)
@@ -2827,6 +2856,7 @@ root and issuing %s.
     def func_jar(self, node, args, kwargs):
         return self.build_target(node, args, kwargs, JarHolder)
 
+    @FeatureNewKwargs('build_target', '0.40.0', ['link_whole', 'override_options'])
     @permittedKwargs(permitted_kwargs['build_target'])
     def func_build_target(self, node, args, kwargs):
         if 'target_type' not in kwargs:
@@ -2851,6 +2881,8 @@ root and issuing %s.
     def func_vcs_tag(self, node, args, kwargs):
         if 'input' not in kwargs or 'output' not in kwargs:
             raise InterpreterException('Keyword arguments input and output must exist')
+        if 'fallback' not in kwargs:
+            FeatureNew('Optional fallback in vcs_tag', '0.41.0').use()
         fallback = kwargs.pop('fallback', self.project_version)
         if not isinstance(fallback, str):
             raise InterpreterException('Keyword argument fallback must be a string.')
@@ -2884,6 +2916,7 @@ root and issuing %s.
         kwargs.setdefault('build_always', True)
         return self.func_custom_target(node, [kwargs['output']], kwargs)
 
+    @FeatureNew('subdir_done', '0.46.0')
     @stringArgs
     def func_subdir_done(self, node, args, kwargs):
         if len(kwargs) > 0:
@@ -2893,6 +2926,7 @@ root and issuing %s.
         raise SubdirDoneRequest()
 
     @stringArgs
+    @FeatureNewKwargs('build target', '0.40.0', ['build_by_default'])
     @permittedKwargs(permitted_kwargs['custom_target'])
     def func_custom_target(self, node, args, kwargs):
         if len(args) != 1:
@@ -2944,6 +2978,7 @@ root and issuing %s.
     def func_benchmark(self, node, args, kwargs):
         self.add_test(node, args, kwargs, False)
 
+    @FeatureNewKwargs('test', '0.46.0', ['depends'])
     @permittedKwargs(permitted_kwargs['test'])
     def func_test(self, node, args, kwargs):
         self.add_test(node, args, kwargs, True)
@@ -3034,6 +3069,7 @@ root and issuing %s.
         self.build.man.append(m)
         return m
 
+    @FeatureNewKwargs('subdir', '0.44.0', ['if_found'])
     @permittedKwargs(permitted_kwargs['subdir'])
     def func_subdir(self, node, args, kwargs):
         self.validate_arguments(args, 1, [str])
@@ -3097,6 +3133,8 @@ root and issuing %s.
                                    'permissions arg to be a string or false')
         return FileMode(*install_mode)
 
+    @FeatureNewKwargs('install_data', '0.46.0', ['rename'])
+    @FeatureNewKwargs('install_data', '0.38.0', ['install_mode'])
     @permittedKwargs(permitted_kwargs['install_data'])
     def func_install_data(self, node, args, kwargs):
         kwsource = mesonlib.stringlistify(kwargs.get('sources', []))
@@ -3118,6 +3156,8 @@ root and issuing %s.
         self.build.data.append(data.held_object)
         return data
 
+    @FeatureNewKwargs('install_subdir', '0.42.0', ['exclude_files', 'exclude_directories'])
+    @FeatureNewKwargs('install_subdir', '0.38.0', ['install_mode'])
     @permittedKwargs(permitted_kwargs['install_subdir'])
     @stringArgs
     def func_install_subdir(self, node, args, kwargs):
@@ -3161,6 +3201,9 @@ root and issuing %s.
         self.build.install_dirs.append(idir)
         return idir
 
+    @FeatureNewKwargs('configure_file', '0.47.0', ['copy'])
+    @FeatureNewKwargs('configure_file', '0.46.0', ['format'])
+    @FeatureNewKwargs('configure_file', '0.41.0', ['capture'])
     @permittedKwargs(permitted_kwargs['configure_file'])
     def func_configure_file(self, node, args, kwargs):
         if len(args) > 0:
@@ -3458,6 +3501,8 @@ different subdirectory.
     def run(self):
         super().run()
         mlog.log('Build targets in project:', mlog.bold(str(len(self.build.targets))))
+        FeatureNew.called_features_report()
+        FeatureDeprecated.called_features_report()
 
     def evaluate_subproject_info(self, path_from_source_root, subproject_dirname):
         depth = 0
@@ -3544,6 +3589,7 @@ different subdirectory.
         if idname not in self.coredata.target_guids:
             self.coredata.target_guids[idname] = str(uuid.uuid4()).upper()
 
+    @FeatureNew('both_libraries', '0.46.0')
     def build_both_libraries(self, node, args, kwargs):
         shared_holder = self.build_target(node, args, kwargs, SharedLibraryHolder)
 
diff --git a/mesonbuild/interpreterbase.py b/mesonbuild/interpreterbase.py
index 9f323d1..38e07f2 100644
--- a/mesonbuild/interpreterbase.py
+++ b/mesonbuild/interpreterbase.py
@@ -123,6 +123,113 @@ class permittedKwargs:
             return f(*wrapped_args, **wrapped_kwargs)
         return wrapped
 
+class FeatureNew:
+    """Checks for new features"""
+    # Shared across all instances
+    feature_versions = dict()
+
+    def __init__(self, feature_name, version):
+        self.feature_name = feature_name
+        self.feature_version = version
+
+    def add_called_feature(self):
+        if self.feature_version not in self.feature_versions:
+            self.feature_versions[self.feature_version] = set()
+        self.feature_versions[self.feature_version].add(self.feature_name)
+
+    def called_features_report():
+        fv = FeatureNew.feature_versions
+        if fv:
+            print('Minimum version of features used:')
+            for version in sorted(fv.keys()):
+                print('{}: {}'.format(version, fv[version]))
+
+    def use(self):
+        self.add_called_feature()
+        tv = mesonlib.target_version
+        if tv == '':
+            return
+        if not mesonlib.version_compare_condition_with_min(tv, self.feature_version):
+            mlog.error(
+                '''Project targetting \'{}\' but tried to use feature introduced in \'{}\': {}'''
+                .format(tv, self.feature_version, self.feature_name))
+
+    def __call__(self, f):
+        @wraps(f)
+        def wrapped(*wrapped_args, **wrapped_kwargs):
+            self.use()
+            return f(*wrapped_args, **wrapped_kwargs)
+        return wrapped
+
+class FeatureDeprecated:
+    """Checks for deprecated features"""
+    # Shared across all instances
+    feature_versions = dict()
+
+    def __init__(self, feature_name, version):
+        self.feature_name = feature_name
+        self.feature_version = version
+
+    def add_called_feature(self):
+        if self.feature_version not in self.feature_versions:
+            self.feature_versions[self.feature_version] = set()
+        self.feature_versions[self.feature_version].add(self.feature_name)
+
+    def called_features_report():
+        fv = FeatureDeprecated.feature_versions
+        if fv:
+            print('Deprecated features used:')
+            for version in sorted(fv.keys()):
+                print('{}: {}'.format(version, fv[version]))
+
+    def use(self):
+        self.add_called_feature()
+        tv = mesonlib.target_version
+        if tv == '':
+            return
+        if not mesonlib.version_compare_condition_with_max(tv, self.feature_version):
+            mlog.error(
+                '''Project targetting \'{}\' but tried to use feature deprecated since \'{}\': {}'''
+                .format(tv, self.feature_version, self.feature_name))
+
+    def __call__(self, f):
+        @wraps(f)
+        def wrapped(*wrapped_args, **wrapped_kwargs):
+            self.use()
+            return f(*wrapped_args, **wrapped_kwargs)
+        return wrapped
+
+class FeatureNewKwargs:
+    def __init__(self, feature_name, feature_version, kwargs):
+        self.feature_name = feature_name
+        self.feature_version = feature_version
+        self.kwargs = kwargs
+
+    def __call__(self, f):
+        @wraps(f)
+        def wrapped(*wrapped_args, **wrapped_kwargs):
+            for arg in self.kwargs:
+                if arg in wrapped_kwargs:
+                    FeatureNew(arg + ' arg in ' + self.feature_name, self.feature_version).use()
+            return f(*wrapped_args, **wrapped_kwargs)
+        return wrapped
+
+class FeatureDeprecatedKwargs:
+    def __init__(self, feature_name, feature_version, kwargs):
+        self.feature_name = feature_name
+        self.feature_version = feature_version
+        self.kwargs = kwargs
+
+    def __call__(self, f):
+        @wraps(f)
+        def wrapped(*wrapped_args, **wrapped_kwargs):
+            for arg in self.kwargs:
+                if arg in wrapped_kwargs:
+                    FeatureDeprecated(arg + ' arg in ' + self.feature_name, self.feature_version).use()
+            return f(*wrapped_args, **wrapped_kwargs)
+        return wrapped
+
+
 class InterpreterException(mesonlib.MesonException):
     pass
 
@@ -298,6 +405,7 @@ class InterpreterBase:
             raise InvalidCode('Keyword arguments are invalid in array construction.')
         return arguments
 
+    @FeatureNew('dict', '0.47.0')
     def evaluate_dictstatement(self, cur):
         (arguments, kwargs) = self.reduce_arguments(cur.args)
         assert (not arguments)
diff --git a/mesonbuild/mesonlib.py b/mesonbuild/mesonlib.py
index 5305ecb..eaa5359 100644
--- a/mesonbuild/mesonlib.py
+++ b/mesonbuild/mesonlib.py
@@ -23,6 +23,8 @@ from mesonbuild import mlog
 
 have_fcntl = False
 have_msvcrt = False
+# Used to report conflicts between meson_version and new features used
+target_version = ''
 
 try:
     import fcntl
@@ -441,6 +443,74 @@ def version_compare_many(vstr1, conditions):
             found.append(req)
     return not_found == [], not_found, found
 
+
+def version_compare_condition_with_min(condition, minimum):
+    match = numpart.match(minimum.strip())
+    if match is None:
+        msg = 'Uncomparable version string {!r}.'
+        raise MesonException(msg.format(minimum))
+    minimum = match.group(0)
+    if condition.startswith('>='):
+        cmpop = operator.lt
+        condition = condition[2:]
+    elif condition.startswith('<='):
+        return True
+        condition = condition[2:]
+    elif condition.startswith('!='):
+        return True
+        condition = condition[2:]
+    elif condition.startswith('=='):
+        cmpop = operator.lt
+        condition = condition[2:]
+    elif condition.startswith('='):
+        cmpop = operator.lt
+        condition = condition[1:]
+    elif condition.startswith('>'):
+        cmpop = operator.lt
+        condition = condition[1:]
+    elif condition.startswith('<'):
+        return True
+        condition = condition[2:]
+    else:
+        cmpop = operator.eq
+    varr1 = grab_leading_numbers(minimum, True)
+    varr2 = grab_leading_numbers(condition, True)
+    return cmpop(varr1, varr2)
+
+def version_compare_condition_with_max(condition, maximum):
+    match = numpart.match(maximum.strip())
+    if match is None:
+        msg = 'Uncomparable version string {!r}.'
+        raise MesonException(msg.format(maximum))
+    maximum = match.group(0)
+    if condition.startswith('>='):
+        return False
+        condition = condition[2:]
+    elif condition.startswith('<='):
+        cmpop = operator.lt
+        condition = condition[2:]
+    elif condition.startswith('!='):
+        return False
+        condition = condition[2:]
+    elif condition.startswith('=='):
+        cmpop = operator.lt
+        condition = condition[2:]
+    elif condition.startswith('='):
+        cmpop = operator.lt
+        condition = condition[1:]
+    elif condition.startswith('>'):
+        return False
+        condition = condition[1:]
+    elif condition.startswith('<'):
+        cmpop = operator.lt
+        condition = condition[2:]
+    else:
+        cmpop = operator.eq
+    varr1 = grab_leading_numbers(maximum, True)
+    varr2 = grab_leading_numbers(condition, True)
+    return cmpop(varr1, varr2)
+
+
 def default_libdir():
     if is_debianlike():
         try:
diff --git a/mesonbuild/modules/gnome.py b/mesonbuild/modules/gnome.py
index ea8ff3f..0c5da17 100644
--- a/mesonbuild/modules/gnome.py
+++ b/mesonbuild/modules/gnome.py
@@ -30,7 +30,7 @@ from . import ExtensionModule
 from . import ModuleReturnValue
 from ..mesonlib import MesonException, OrderedSet, Popen_safe, extract_as_list
 from ..dependencies import Dependency, PkgConfigDependency, InternalDependency
-from ..interpreterbase import noKwargs, permittedKwargs
+from ..interpreterbase import noKwargs, permittedKwargs, FeatureNew, FeatureNewKwargs
 
 # gresource compilation is broken due to the way
 # the resource compiler and Ninja clash about it
@@ -95,6 +95,7 @@ class GnomeModule(ExtensionModule):
                          mlog.bold('https://github.com/mesonbuild/meson/issues/1387'))
             gdbuswarning_printed = True
 
+    @FeatureNewKwargs('gnome.compile_resources', '0.37.0', ['gresource_bundle', 'export', 'install_header'])
     @permittedKwargs({'source_dir', 'c_name', 'dependencies', 'export', 'gresource_bundle', 'install_header',
                       'install', 'install_dir', 'extra_args', 'build_by_default'})
     def compile_resources(self, state, args, kwargs):
@@ -384,6 +385,7 @@ class GnomeModule(ExtensionModule):
             ldflags = fixed_ldflags
         return cflags, ldflags, gi_includes
 
+    @FeatureNewKwargs('build target', '0.40.0', ['build_by_default'])
     @permittedKwargs({'sources', 'nsversion', 'namespace', 'symbol_prefix', 'identifier_prefix',
                       'export_packages', 'includes', 'dependencies', 'link_with', 'include_directories',
                       'install', 'install_dir_gir', 'install_dir_typelib', 'extra_args',
@@ -635,6 +637,7 @@ class GnomeModule(ExtensionModule):
         rv = [scan_target, typelib_target]
         return ModuleReturnValue(rv, rv)
 
+    @FeatureNewKwargs('build target', '0.40.0', ['build_by_default'])
     @permittedKwargs({'build_by_default', 'depend_files'})
     def compile_schemas(self, state, args, kwargs):
         if args:
@@ -721,6 +724,7 @@ This will become a hard error in the future.''')
         rv = [inscript, pottarget, potarget]
         return ModuleReturnValue(None, rv)
 
+    @FeatureNewKwargs('gnome.gtkdoc', '0.37.0', ['namespace', 'mode'])
     @permittedKwargs({'main_xml', 'main_sgml', 'src_dir', 'dependencies', 'install',
                       'install_dir', 'scan_args', 'scanobjs_args', 'gobject_typesfile',
                       'fixxref_args', 'html_args', 'html_assets', 'content_files',
@@ -875,6 +879,8 @@ This will become a hard error in the future.''')
 
         return []
 
+    @FeatureNewKwargs('build target', '0.46.0', ['install_header', 'install_dir', 'sources'])
+    @FeatureNewKwargs('build target', '0.40.0', ['build_by_default'])
     @permittedKwargs({'interface_prefix', 'namespace', 'object_manager', 'build_by_default',
                       'annotations', 'docbook', 'install_header', 'install_dir', 'sources'})
     def gdbus_codegen(self, state, args, kwargs):
@@ -1090,6 +1096,7 @@ This will become a hard error in the future.''')
         else:
             return ModuleReturnValue(targets, targets)
 
+    @FeatureNew('gnome.mkenums_simple', '0.42.0')
     def mkenums_simple(self, state, args, kwargs):
         hdr_filename = args[0] + '.h'
         body_filename = args[0] + '.c'
diff --git a/mesonbuild/modules/i18n.py b/mesonbuild/modules/i18n.py
index 4281200..b44fbea 100644
--- a/mesonbuild/modules/i18n.py
+++ b/mesonbuild/modules/i18n.py
@@ -19,7 +19,7 @@ from .. import coredata, mesonlib, build
 from ..mesonlib import MesonException
 from . import ModuleReturnValue
 from . import ExtensionModule
-from ..interpreterbase import permittedKwargs
+from ..interpreterbase import permittedKwargs, FeatureNew, FeatureNewKwargs
 
 PRESET_ARGS = {
     'glib': [
@@ -55,6 +55,7 @@ class I18nModule(ExtensionModule):
         src_dir = path.join(state.environment.get_source_dir(), state.subdir)
         return [path.join(src_dir, d) for d in dirs]
 
+    @FeatureNew('i18n.merge_file', '0.37.0')
     @permittedKwargs({'languages', 'data_dirs', 'preset', 'args', 'po_dir', 'type',
                       'input', 'output', 'install', 'install_dir'})
     def merge_file(self, state, args, kwargs):
@@ -82,6 +83,7 @@ class I18nModule(ExtensionModule):
         ct = build.CustomTarget(kwargs['output'] + '_merge', state.subdir, state.subproject, kwargs)
         return ModuleReturnValue(ct, [ct])
 
+    @FeatureNewKwargs('i18n.gettext', '0.37.0', ['preset'])
     @permittedKwargs({'po_dir', 'data_dirs', 'type', 'languages', 'args', 'preset', 'install'})
     def gettext(self, state, args, kwargs):
         if len(args) != 1:
diff --git a/mesonbuild/modules/pkgconfig.py b/mesonbuild/modules/pkgconfig.py
index 365d3cd..68c2dc5 100644
--- a/mesonbuild/modules/pkgconfig.py
+++ b/mesonbuild/modules/pkgconfig.py
@@ -21,7 +21,7 @@ from .. import mesonlib
 from .. import mlog
 from . import ModuleReturnValue
 from . import ExtensionModule
-from ..interpreterbase import permittedKwargs
+from ..interpreterbase import permittedKwargs, FeatureNew, FeatureNewKwargs
 
 class DependenciesHelper:
     def __init__(self, name):
@@ -304,16 +304,21 @@ class PkgConfigModule(ExtensionModule):
                 ofile.write(self._escape(f))
             ofile.write('\n')
 
+    @FeatureNewKwargs('pkgconfig.generate', '0.42.0', ['extra_cflags'])
+    @FeatureNewKwargs('pkgconfig.generate', '0.41.0', ['variables'])
     @permittedKwargs({'libraries', 'version', 'name', 'description', 'filebase',
                       'subdirs', 'requires', 'requires_private', 'libraries_private',
                       'install_dir', 'extra_cflags', 'variables', 'url', 'd_module_versions'})
     def generate(self, state, args, kwargs):
+        if 'variables' in kwargs:
+            FeatureNew('custom pkgconfig variables', '0.41.0').use()
         default_version = state.project_version['version']
         default_install_dir = None
         default_description = None
         default_name = None
         mainlib = None
         if len(args) == 1:
+            FeatureNew('pkgconfig.generate optional positional argument', '0.46.0').use()
             mainlib = getattr(args[0], 'held_object', args[0])
             if not isinstance(mainlib, (build.StaticLibrary, build.SharedLibrary)):
                 raise mesonlib.MesonException('Pkgconfig_gen first positional argument must be a library object')
diff --git a/mesonbuild/modules/python.py b/mesonbuild/modules/python.py
index a705109..b30a1e6 100644
--- a/mesonbuild/modules/python.py
+++ b/mesonbuild/modules/python.py
@@ -22,7 +22,8 @@ from mesonbuild.modules import ModuleReturnValue
 from . import permittedSnippetKwargs
 from ..interpreterbase import (
     noPosargs, noKwargs, permittedKwargs,
-    InterpreterObject, InvalidArguments
+    InterpreterObject, InvalidArguments,
+    FeatureNew
 )
 from ..interpreter import ExternalProgramHolder
 from ..interpreterbase import flatten
@@ -49,6 +50,8 @@ def run_command(python, command):
 
 
 class PythonDependency(ExternalDependency):
+
+    @FeatureNew('Python Module', '0.46.0')
     def __init__(self, python_holder, environment, kwargs):
         super().__init__('python', environment, None, kwargs)
         self.name = 'python'
diff --git a/mesonbuild/modules/qt.py b/mesonbuild/modules/qt.py
index 39c65ed..ccf0930 100644
--- a/mesonbuild/modules/qt.py
+++ b/mesonbuild/modules/qt.py
@@ -19,7 +19,7 @@ from ..mesonlib import MesonException, Popen_safe, extract_as_list, File
 from ..dependencies import Qt4Dependency, Qt5Dependency
 import xml.etree.ElementTree as ET
 from . import ModuleReturnValue, get_include_args
-from ..interpreterbase import permittedKwargs
+from ..interpreterbase import permittedKwargs, FeatureNewKwargs
 
 _QT_DEPS_LUT = {
     4: Qt4Dependency,
@@ -116,6 +116,7 @@ class QtBaseModule:
         except Exception:
             return []
 
+    @FeatureNewKwargs('qt.preprocess', '0.44.0', ['moc_extra_arguments'])
     @permittedKwargs({'moc_headers', 'moc_sources', 'moc_extra_arguments', 'include_directories', 'ui_files', 'qresources', 'method'})
     def preprocess(self, state, args, kwargs):
         rcc_files, ui_files, moc_headers, moc_sources, moc_extra_arguments, sources, include_directories \
@@ -181,6 +182,7 @@ class QtBaseModule:
             sources.append(moc_output)
         return ModuleReturnValue(sources, sources)
 
+    @FeatureNewKwargs('build target', '0.40.0', ['build_by_default'])
     @permittedKwargs({'ts_files', 'install', 'install_dir', 'build_by_default', 'method'})
     def compile_translations(self, state, args, kwargs):
         ts_files, install_dir = extract_as_list(kwargs, 'ts_files', 'install_dir', pop=True)
diff --git a/mesonbuild/modules/unstable_icestorm.py b/mesonbuild/modules/unstable_icestorm.py
index bf06314..051dc5f 100644
--- a/mesonbuild/modules/unstable_icestorm.py
+++ b/mesonbuild/modules/unstable_icestorm.py
@@ -14,11 +14,13 @@
 
 from .. import mesonlib
 from ..interpreterbase import flatten
+from ..interpreterbase import FeatureNew
 
 from . import ExtensionModule
 
 class IceStormModule(ExtensionModule):
 
+    @FeatureNew('FPGA/Icestorm Module', '0.45.0')
     def __init__(self, interpreter):
         super().__init__(interpreter)
         self.snippets.add('project')
diff --git a/mesonbuild/modules/unstable_simd.py b/mesonbuild/modules/unstable_simd.py
index c41e96c..b64242a 100644
--- a/mesonbuild/modules/unstable_simd.py
+++ b/mesonbuild/modules/unstable_simd.py
@@ -16,8 +16,11 @@ from .. import mesonlib, compilers, mlog
 
 from . import ExtensionModule
 
+from ..interpreterbase import FeatureNew
+
 class SimdModule(ExtensionModule):
 
+    @FeatureNew('SIMD module', '0.42.0')
     def __init__(self, interpreter):
         super().__init__(interpreter)
         self.snippets.add('check')
diff --git a/mesonbuild/optinterpreter.py b/mesonbuild/optinterpreter.py
index b4156ff..3da5dad 100644
--- a/mesonbuild/optinterpreter.py
+++ b/mesonbuild/optinterpreter.py
@@ -19,7 +19,7 @@ from . import mlog
 from . import mparser
 from . import coredata
 from . import mesonlib
-
+from .interpreterbase import FeatureNew
 
 forbidden_option_names = coredata.get_builtin_options()
 forbidden_prefixes = {'c_',
@@ -106,6 +106,7 @@ def IntegerParser(name, description, kwargs):
                                       kwargs['value'],
                                       kwargs.get('yield', coredata.default_yielding))
 
+@FeatureNew('array type option()', '0.44.0')
 @permitted_kwargs({'value', 'yield', 'choices'})
 def string_array_parser(name, description, kwargs):
     if 'choices' in kwargs:
@@ -230,6 +231,10 @@ class OptionInterpreter:
         if func_name != 'option':
             raise OptionException('Only calls to option() are allowed in option files.')
         (posargs, kwargs) = self.reduce_arguments(node.args)
+
+        if 'yield' in kwargs:
+            FeatureNew('option yield', '0.45.0').use()
+
         if 'type' not in kwargs:
             raise OptionException('Option call missing mandatory "type" keyword argument')
         opt_type = kwargs.pop('type')