Merge pull request #8706 from dcbaker/wip/2021-04/cython-language

1st class Cython language support

docs/markdown/Cython.md

@@ -0,0 +1,33 @@
+---
+title: Cython
+short-description: Support for Cython in Meson
+...
+
+# Cython
+
+Meson provides native support for cython programs starting with version 0.59.0.
+This means that you can include it as a normal language, and create targets like
+any other supported language:
+
+```meson
+lib = static_library(
+    'foo',
+    'foo.pyx',
+)
+```
+
+Generally Cython is most useful when combined with the python module's
+extension_module method:
+
+```meson
+project('my project', 'cython')
+
+py = import('python')
+dep_py3 = py.dependency()
+
+py.extension_module(
+    'foo',
+    'foo.pyx',
+    dependencies : dep_py,
+)
+```

docs/markdown/Reference-tables.md

@@ -34,6 +34,7 @@ These are return values of the `get_id` (Compiler family) and
 | sun       | Sun Fortran compiler             |                 |
 | valac     | Vala compiler                    |                 |
 | xc16      | Microchip XC16 C compiler        |                 |
+| cython    | The Cython compiler              |                 |
 
 ## Linker ids
 
@@ -160,6 +161,7 @@ These are the parameter names for passing language specific arguments to your bu
 | Objective C++ | objcpp_args   | objcpp_link_args  |
 | Rust          | rust_args     | rust_link_args    |
 | Vala          | vala_args     | vala_link_args    |
+| Cython        | cython_args   | cython_link_args  |
 
 All these `<lang>_*` options are specified per machine. See in
 [specifying options per
@@ -177,16 +179,17 @@ are many caveats to their use, especially when rebuilding the project.
 It is **highly** recommended that you use [the command line
 arguments](#language-arguments-parameter-names) instead.
 
-| Name      | Comment                                  |
+| Name        | Comment                                  |
-| -----     | -------                                  |
+| -----       | -------                                  |
-| CFLAGS    | Flags for the C compiler                 |
+| CFLAGS      | Flags for the C compiler                 |
-| CXXFLAGS  | Flags for the C++ compiler               |
+| CXXFLAGS    | Flags for the C++ compiler               |
-| OBJCFLAGS | Flags for the Objective C compiler       |
+| OBJCFLAGS   | Flags for the Objective C compiler       |
-| FFLAGS    | Flags for the Fortran compiler           |
+| FFLAGS      | Flags for the Fortran compiler           |
-| DFLAGS    | Flags for the D compiler                 |
+| DFLAGS      | Flags for the D compiler                 |
-| VALAFLAGS | Flags for the Vala compiler              |
+| VALAFLAGS   | Flags for the Vala compiler              |
-| RUSTFLAGS | Flags for the Rust compiler              |
+| RUSTFLAGS   | Flags for the Rust compiler              |
-| LDFLAGS   | The linker flags, used for all languages |
+| CYTHONFLAGS | Flags for the Cython compiler            |
+| LDFLAGS     | The linker flags, used for all languages |
 
 N.B. these settings are specified per machine, and so the environment
 varibles actually come in pairs. See the [environment variables per

docs/markdown/snippets/first-class-cython.md

@@ -0,0 +1,18 @@
+## Cython as as first class language
+
+Meson now supports Cython as a first class language. This means you can write:
+
+```meson
+project('my project', 'cython')
+
+py = import('python')
+dep_py3 = py.dependency()
+
+py.extension_module(
+    'foo',
+    'foo.pyx',
+    dependencies : dep_py,
+)
+```
+
+And avoid the step through a generator that was previously required.

docs/sitemap.txt

@@ -59,6 +59,7 @@ index.md
 		Java.md
 		Vala.md
 		D.md
+		Cython.md
 		IDE-integration.md
 		Custom-build-targets.md
 		Build-system-converters.md

mesonbuild/backend/ninjabackend.py

@@ -749,6 +749,9 @@ int dummy;
             # C/C++ sources, objects, generated libs, and unknown sources now.
             target_sources, generated_sources, \
                 transpiled_sources = self.generate_vala_compile(target)
+        elif 'cython' in target.compilers:
+            target_sources, generated_sources, \
+                transpiled_sources = self.generate_cython_transpile(target)
         else:
             target_sources = self.get_target_sources(target)
             generated_sources = self.get_target_generated_sources(target)
@@ -1544,6 +1547,66 @@ int dummy;
         self.create_target_source_introspection(target, valac, args, all_files, [])
         return other_src[0], other_src[1], vala_c_src
 
+    def generate_cython_transpile(self, target: build.BuildTarget) -> \
+            T.Tuple[T.MutableMapping[str, File], T.MutableMapping[str, File], T.List[str]]:
+        """Generate rules for transpiling Cython files to C or C++
+
+        XXX: Currently only C is handled.
+        """
+        static_sources: T.MutableMapping[str, File] = OrderedDict()
+        generated_sources: T.MutableMapping[str, File] = OrderedDict()
+        cython_sources: T.List[str] = []
+
+        cython = target.compilers['cython']
+
+        opt_proxy = self.get_compiler_options_for_target(target)
+
+        args: T.List[str] = []
+        args += cython.get_always_args()
+        args += cython.get_buildtype_args(self.get_option_for_target(OptionKey('buildtype'), target))
+        args += cython.get_debug_args(self.get_option_for_target(OptionKey('debug'), target))
+        args += cython.get_optimization_args(self.get_option_for_target(OptionKey('optimization'), target))
+        args += cython.get_option_compile_args(opt_proxy)
+        args += self.build.get_global_args(cython, target.for_machine)
+        args += self.build.get_project_args(cython, target.subproject, target.for_machine)
+
+        for src in target.get_sources():
+            if src.endswith('.pyx'):
+                output = os.path.join(self.get_target_private_dir(target), f'{src}.c')
+                args = args.copy()
+                args += cython.get_output_args(output)
+                element = NinjaBuildElement(
+                    self.all_outputs, [output],
+                    self.compiler_to_rule_name(cython),
+                    [src.absolute_path(self.environment.get_source_dir(), self.environment.get_build_dir())])
+                element.add_item('ARGS', args)
+                self.add_build(element)
+                # TODO: introspection?
+                cython_sources.append(output)
+            else:
+                static_sources[src.rel_to_builddir(self.build_to_src)] = src
+
+        for gen in target.get_generated_sources():
+            for ssrc in gen.get_outputs():
+                if isinstance(gen, GeneratedList):
+                    ssrc = os.path.join(self.get_target_private_dir(target) , ssrc)
+                if ssrc.endswith('.pyx'):
+                    args = args.copy()
+                    output = os.path.join(self.get_target_private_dir(target), f'{ssrc}.c')
+                    args += cython.get_output_args(output)
+                    element = NinjaBuildElement(
+                        self.all_outputs, [output],
+                        self.compiler_to_rule_name(cython),
+                        [ssrc])
+                    element.add_item('ARGS', args)
+                    self.add_build(element)
+                    # TODO: introspection?
+                    cython_sources.append(output)
+                else:
+                    generated_sources[ssrc] = mesonlib.File.from_built_file(gen.subdir, ssrc)
+
+        return static_sources, generated_sources, cython_sources
+
     def generate_rust_target(self, target: build.BuildTarget) -> None:
         rustc = target.compilers['rust']
         # Rust compiler takes only the main file as input and
@@ -1889,10 +1952,7 @@ int dummy;
         for for_machine in MachineChoice:
             complist = self.environment.coredata.compilers[for_machine]
             for langname, compiler in complist.items():
-                if langname == 'java' \
+                if langname in {'java', 'vala', 'rust', 'cs', 'cython'}:
-                        or langname == 'vala' \
-                        or langname == 'rust' \
-                        or langname == 'cs':
                     continue
                 rule = '{}_LINKER{}'.format(langname, self.get_rule_suffix(for_machine))
                 command = compiler.get_linker_exelist()
@@ -1940,6 +2000,12 @@ int dummy;
         description = 'Compiling Vala source $in'
         self.add_rule(NinjaRule(rule, command, [], description, extra='restat = 1'))
 
+    def generate_cython_compile_rules(self, compiler: 'Compiler') -> None:
+        rule = self.compiler_to_rule_name(compiler)
+        command = compiler.get_exelist() + ['$ARGS', '$in']
+        description = 'Compiling Cython source $in'
+        self.add_rule(NinjaRule(rule, command, [], description, extra='restat = 1'))
+
     def generate_rust_compile_rules(self, compiler):
         rule = self.compiler_to_rule_name(compiler)
         command = compiler.get_exelist() + ['$ARGS', '$in']
@@ -2012,6 +2078,9 @@ https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47485'''))
             if self.environment.machines.matches_build_machine(compiler.for_machine):
                 self.generate_swift_compile_rules(compiler)
             return
+        if langname == 'cython':
+            self.generate_cython_compile_rules(compiler)
+            return
         crstr = self.get_rule_suffix(compiler.for_machine)
         if langname == 'fortran':
             self.generate_fortran_dep_hack(crstr)

mesonbuild/build.py

@@ -41,9 +41,10 @@ from .interpreterbase import FeatureNew
 
 if T.TYPE_CHECKING:
     from ._typing import ImmutableListProtocol, ImmutableSetProtocol
-    from .interpreter.interpreter import Test, SourceOutputs
+    from .interpreter.interpreter import Test, SourceOutputs, Interpreter
     from .mesonlib import FileMode, FileOrString
     from .backend.backends import Backend
+    from .interpreter.interpreterobjects import GeneratorHolder
 
 pch_kwargs = {'c_pch', 'cpp_pch'}
 
@@ -63,6 +64,7 @@ lang_arg_kwargs = {
     'rust_args',
     'vala_args',
     'cs_args',
+    'cython_args',
 }
 
 vala_kwargs = {'vala_header', 'vala_gir', 'vala_vapi'}
@@ -810,7 +812,7 @@ class BuildTarget(Target):
 
         # If all our sources are Vala, our target also needs the C compiler but
         # it won't get added above.
-        if 'vala' in self.compilers and 'c' not in self.compilers:
+        if ('vala' in self.compilers or 'cython' in self.compilers) and 'c' not in self.compilers:
             self.compilers['c'] = compilers['c']
 
     def validate_sources(self):
@@ -1564,7 +1566,7 @@ class Generator:
                     raise InvalidArguments('Depends entries must be build targets.')
                 self.depends.append(d)
 
-    def get_base_outnames(self, inname):
+    def get_base_outnames(self, inname) -> T.List[str]:
         plainname = os.path.basename(inname)
         basename = os.path.splitext(plainname)[0]
         bases = [x.replace('@BASENAME@', basename).replace('@PLAINNAME@', plainname) for x in self.outputs]
@@ -1586,7 +1588,7 @@ class Generator:
         relpath = pathlib.PurePath(trial).relative_to(parent)
         return relpath.parts[0] != '..' # For subdirs we can only go "down".
 
-    def process_files(self, name, files, state, preserve_path_from=None, extra_args=None):
+    def process_files(self, name, files, state: 'Interpreter', preserve_path_from=None, extra_args=None):
         new = False
         output = GeneratedList(self, state.subdir, preserve_path_from, extra_args=extra_args if extra_args is not None else [])
         #XXX
@@ -1621,14 +1623,14 @@ class Generator:
 
 
 class GeneratedList:
-    def __init__(self, generator, subdir, preserve_path_from=None, extra_args=None):
+    def __init__(self, generator: 'GeneratorHolder', subdir: str, preserve_path_from=None, extra_args=None):
         self.generator = unholder(generator)
         self.name = self.generator.exe
         self.depends = set() # Things this target depends on (because e.g. a custom target was used as input)
         self.subdir = subdir
-        self.infilelist = []
+        self.infilelist: T.List['File'] = []
-        self.outfilelist = []
+        self.outfilelist: T.List[str] = []
-        self.outmap = {}
+        self.outmap: T.Dict['File', str] = {}
         self.extra_depends = []
         self.depend_files = []
         self.preserve_path_from = preserve_path_from
@@ -1642,17 +1644,17 @@ class GeneratedList:
                 # know the absolute path of
                 self.depend_files.append(File.from_absolute_file(path))
 
-    def add_preserved_path_segment(self, infile, outfiles, state):
+    def add_preserved_path_segment(self, infile: 'File', outfiles: T.List[str], state: 'Interpreter') -> T.List[str]:
-        result = []
+        result: T.List[str] = []
         in_abs = infile.absolute_path(state.environment.source_dir, state.environment.build_dir)
-        assert(os.path.isabs(self.preserve_path_from))
+        assert os.path.isabs(self.preserve_path_from)
         rel = os.path.relpath(in_abs, self.preserve_path_from)
         path_segment = os.path.dirname(rel)
         for of in outfiles:
             result.append(os.path.join(path_segment, of))
         return result
 
-    def add_file(self, newfile, state):
+    def add_file(self, newfile: 'File', state: 'Interpreter') -> None:
         self.infilelist.append(newfile)
         outfiles = self.generator.get_base_outnames(newfile.fname)
         if self.preserve_path_from:
@@ -1660,16 +1662,16 @@ class GeneratedList:
         self.outfilelist += outfiles
         self.outmap[newfile] = outfiles
 
-    def get_inputs(self):
+    def get_inputs(self) -> T.List['File']:
         return self.infilelist
 
     def get_outputs(self) -> T.List[str]:
         return self.outfilelist
 
-    def get_outputs_for(self, filename):
+    def get_outputs_for(self, filename: 'File') -> T.List[str]:
         return self.outmap[filename]
 
-    def get_generator(self):
+    def get_generator(self) -> 'Generator':
         return self.generator
 
     def get_extra_args(self):

mesonbuild/compilers/__init__.py

@@ -107,6 +107,7 @@ __all__ = [
     'VisualStudioCCompiler',
     'VisualStudioCPPCompiler',
     'CLikeCompiler',
+    'CythonCompiler',
 ]
 
 # Bring symbols from each module into compilers sub-package namespace
@@ -213,3 +214,4 @@ from .mixins.gnu import GnuCompiler, GnuLikeCompiler
 from .mixins.intel import IntelGnuLikeCompiler, IntelVisualStudioLikeCompiler
 from .mixins.clang import ClangCompiler
 from .mixins.clike import CLikeCompiler
+from .cython import CythonCompiler

mesonbuild/compilers/compilers.py

@@ -64,6 +64,7 @@ lang_suffixes = {
     'cs': ('cs',),
     'swift': ('swift',),
     'java': ('java',),
+    'cython': ('pyx', ),
 }  # type: T.Dict[str, T.Tuple[str, ...]]
 all_languages = lang_suffixes.keys()
 cpp_suffixes = lang_suffixes['cpp'] + ('h',)  # type: T.Tuple[str, ...]
@@ -97,6 +98,7 @@ CFLAGS_MAPPING: T.Mapping[str, str] = {
     'd': 'DFLAGS',
     'vala': 'VALAFLAGS',
     'rust': 'RUSTFLAGS',
+    'cython': 'CYTHONFLAGS',
 }
 
 CEXE_MAPPING: T.Mapping = {

mesonbuild/compilers/cython.py

@@ -0,0 +1,79 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright © 2021 Intel Corporation
+
+"""Abstraction for Cython language compilers."""
+
+import typing as T
+
+from .. import coredata
+from ..mesonlib import EnvironmentException, OptionKey
+from .compilers import Compiler
+
+if T.TYPE_CHECKING:
+    from ..coredata import KeyedOptionDictType
+    from ..environment import Environment
+
+
+class CythonCompiler(Compiler):
+
+    """Cython Compiler."""
+
+    language = 'cython'
+    id = 'cython'
+
+    def needs_static_linker(self) -> bool:
+        # We transpile into C, so we don't need any linker
+        return False
+
+    def get_always_args(self) -> T.List[str]:
+        return ['--fast-fail']
+
+    def get_werror_args(self) -> T.List[str]:
+        return ['-Werror']
+
+    def get_output_args(self, outputname: str) -> T.List[str]:
+        return ['-o', outputname]
+
+    def get_optimization_args(self, optimization_level: str) -> T.List[str]:
+        # Cython doesn't have optimization levels itself, the underlying
+        # compiler might though
+        return []
+
+    def sanity_check(self, work_dir: str, environment: 'Environment') -> None:
+        code = 'print("hello world")'
+        with self.cached_compile(code, environment.coredata) as p:
+            if p.returncode != 0:
+                raise EnvironmentException(f'Cython compiler {self.id!r} cannot compile programs')
+
+    def get_buildtype_args(self, buildtype: str) -> T.List[str]:
+        # Cython doesn't implement this, but Meson requires an implementation
+        return []
+
+    def get_pic_args(self) -> T.List[str]:
+        # We can lie here, it's fine
+        return []
+
+    def compute_parameters_with_absolute_paths(self, parameter_list: T.List[str],
+                                               build_dir: str) -> T.List[str]:
+        new: T.List[str] = []
+        for i in parameter_list:
+            new.append(i)
+
+        return new
+
+    def get_options(self) -> 'KeyedOptionDictType':
+        opts = super().get_options()
+        opts.update({
+            OptionKey('version', machine=self.for_machine, lang=self.language): coredata.UserComboOption(
+                'Python version to target',
+                ['2', '3'],
+                '3',
+            )
+        })
+        return opts
+
+    def get_option_compile_args(self, options: 'KeyedOptionDictType') -> T.List[str]:
+        args: T.List[str] = []
+        key = options[OptionKey('version', machine=self.for_machine, lang=self.language)]
+        args.append(f'-{key.value}')
+        return args

mesonbuild/environment.py

@@ -87,6 +87,7 @@ from .compilers import (
     ClangObjCPPCompiler,
     ClangClCCompiler,
     ClangClCPPCompiler,
+    CythonCompiler,
     FlangFortranCompiler,
     G95FortranCompiler,
     GnuCCompiler,
@@ -732,6 +733,7 @@ class Environment:
         self.default_rust = ['rustc']
         self.default_swift = ['swiftc']
         self.default_vala = ['valac']
+        self.default_cython = [['cython']]
         self.default_static_linker = ['ar', 'gar']
         self.default_strip = ['strip']
         self.vs_static_linker = ['lib']
@@ -1757,6 +1759,30 @@ class Environment:
 
         self._handle_exceptions(popen_exceptions, compilers)
 
+    def detect_cython_compiler(self, for_machine: MachineChoice) -> CythonCompiler:
+        """Search for a cython compiler."""
+        compilers = self.lookup_binary_entry(for_machine, 'cython')
+        is_cross = self.is_cross_build(for_machine)
+        info = self.machines[for_machine]
+        if compilers is None:
+            # TODO support fallback
+            compilers = [self.default_cython[0]]
+
+        popen_exceptions: T.Dict[str, Exception] = {}
+        for comp in compilers:
+            try:
+                err = Popen_safe(comp + ['-V'])[2]
+            except OSError as e:
+                popen_exceptions[' '.join(comp + ['-V'])] = e
+                continue
+
+            version = search_version(err)
+            if 'Cython' in err:
+                comp_class = CythonCompiler
+                self.coredata.add_lang_args(comp_class.language, comp_class, for_machine, self)
+                return comp_class(comp, version, for_machine, info, is_cross=is_cross)
+        self._handle_exceptions(popen_exceptions, compilers)
+
     def detect_vala_compiler(self, for_machine):
         exelist = self.lookup_binary_entry(for_machine, 'vala')
         is_cross = self.is_cross_build(for_machine)
@@ -2023,6 +2049,8 @@ class Environment:
             comp = self.detect_fortran_compiler(for_machine)
         elif lang == 'swift':
             comp = self.detect_swift_compiler(for_machine)
+        elif lang == 'cython':
+            comp = self.detect_cython_compiler(for_machine)
         else:
             comp = None
         return comp

mesonbuild/interpreter/interpreter.py

@@ -1193,8 +1193,9 @@ external dependencies (including libraries) must go to "dependencies".''')
         args = [a.lower() for a in args]
         langs = set(self.coredata.compilers[for_machine].keys())
         langs.update(args)
-        if 'vala' in langs and 'c' not in langs:
+        if ('vala' in langs or 'cython' in langs) and 'c' not in langs:
-            FeatureNew('Adding Vala language without C', '0.59.0').use(self.subproject)
+            if 'vala' in langs:
+                FeatureNew.single_use('Adding Vala language without C', '0.59.0', self.subproject)
             args.append('c')
 
         success = True

run_project_tests.py

@@ -54,8 +54,8 @@ from run_tests import guess_backend
 
 ALL_TESTS = ['cmake', 'common', 'native', 'warning-meson', 'failing-meson', 'failing-build', 'failing-test',
              'keyval', 'platform-osx', 'platform-windows', 'platform-linux',
-             'java', 'C#', 'vala',  'rust', 'd', 'objective c', 'objective c++',
+             'java', 'C#', 'vala', 'cython', 'rust', 'd', 'objective c', 'objective c++',
-             'fortran', 'swift', 'cuda', 'python3', 'python', 'fpga', 'frameworks', 'nasm', 'wasm'
+             'fortran', 'swift', 'cuda', 'python3', 'python', 'fpga', 'frameworks', 'nasm', 'wasm',
              ]
 
 
@@ -1016,6 +1016,7 @@ def detect_tests_to_run(only: T.Dict[str, T.List[str]], use_tmp: bool) -> T.List
         TestCategory('java', 'java', backend is not Backend.ninja or mesonlib.is_osx() or not have_java()),
         TestCategory('C#', 'csharp', skip_csharp(backend)),
         TestCategory('vala', 'vala', backend is not Backend.ninja or not shutil.which(os.environ.get('VALAC', 'valac'))),
+        TestCategory('cython', 'cython', backend is not Backend.ninja or not shutil.which(os.environ.get('CYTHON', 'cython'))),
         TestCategory('rust', 'rust', should_skip_rust(backend)),
         TestCategory('d', 'd', backend is not Backend.ninja or not have_d_compiler()),
         TestCategory('objective c', 'objc', backend not in (Backend.ninja, Backend.xcode) or not have_objc_compiler(options.use_tmpdir)),

test cases/cython/1 basic/cytest.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+
+from storer import Storer
+
+s = Storer()
+
+if s.get_value() != 0:
+    raise SystemExit('Initial value incorrect.')
+
+s.set_value(42)
+
+if s.get_value() != 42:
+    raise SystemExit('Setting value failed.')
+
+try:
+    s.set_value('not a number')
+    raise SystemExit('Using wrong argument type did not fail.')
+except TypeError:
+    pass

test cases/cython/1 basic/libdir/cstorer.pxd

@@ -0,0 +1,9 @@
+
+cdef extern from "storer.h":
+    ctypedef struct Storer:
+        pass
+
+    Storer* storer_new();
+    void storer_destroy(Storer *s);
+    int storer_get_value(Storer *s);
+    void storer_set_value(Storer *s, int v);

test cases/cython/1 basic/libdir/meson.build

@@ -0,0 +1,8 @@
+slib = py3.extension_module(
+  'storer',
+  'storer.pyx',
+  'storer.c',
+  dependencies : py3_dep
+)
+
+pydir = meson.current_build_dir()

test cases/cython/1 basic/libdir/storer.c

@@ -0,0 +1,24 @@
+#include"storer.h"
+#include<stdlib.h>
+
+struct _Storer {
+    int value;
+};
+
+Storer* storer_new() {
+    Storer *s = malloc(sizeof(struct _Storer));
+    s->value = 0;
+    return s;
+}
+
+void storer_destroy(Storer *s) {
+    free(s);
+}
+
+int storer_get_value(Storer *s) {
+    return s->value;
+}
+
+void storer_set_value(Storer *s, int v) {
+    s->value = v;
+}

test cases/cython/1 basic/libdir/storer.h

@@ -0,0 +1,8 @@
+#pragma once
+
+typedef struct _Storer Storer;
+
+Storer* storer_new();
+void storer_destroy(Storer *s);
+int storer_get_value(Storer *s);
+void storer_set_value(Storer *s, int v);

test cases/cython/1 basic/libdir/storer.pyx

@@ -0,0 +1,16 @@
+cimport cstorer
+
+cdef class Storer:
+    cdef cstorer.Storer* _c_storer
+
+    def __cinit__(self):
+        self._c_storer = cstorer.storer_new()
+
+    def __dealloc__(self):
+        cstorer.storer_destroy(self._c_storer)
+
+    cpdef int get_value(self):
+        return cstorer.storer_get_value(self._c_storer)
+
+    cpdef set_value(self, int value):
+        cstorer.storer_set_value(self._c_storer, value)

test cases/cython/1 basic/meson.build

@@ -0,0 +1,20 @@
+project(
+  'basic cython project',
+  ['cython', 'c'],
+  default_options : ['warning_level=3']
+)
+
+py_mod = import('python')
+py3 = py_mod.find_installation()
+py3_dep = py3.dependency(required : false)
+if not py3_dep.found()
+  error('MESON_SKIP_TEST: Python library not found.')
+endif
+
+subdir('libdir')
+
+test('cython tester',
+  py3,
+  args : files('cytest.py'),
+  env : ['PYTHONPATH=' + pydir]
+)

test cases/cython/2 generated sources/configure.pyx.in

@@ -0,0 +1,2 @@
+cpdef func():
+    return "Hello, World!"

test cases/cython/2 generated sources/g.in

@@ -0,0 +1,2 @@
+cpdef func():
+    return "Hello, World!"

test cases/cython/2 generated sources/gen.py

@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: Apache-2.0
+
+import argparse
+import textwrap
+
+parser = argparse.ArgumentParser()
+parser.add_argument('output')
+args = parser.parse_args()
+
+with open(args.output, 'w') as f:
+    f.write(textwrap.dedent('''\
+        cpdef func():
+            return "Hello, World!"
+        '''))

test cases/cython/2 generated sources/generator.py

@@ -0,0 +1,12 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: Apache-2.0
+
+import argparse
+
+parser = argparse.ArgumentParser()
+parser.add_argument('input')
+parser.add_argument('output')
+args = parser.parse_args()
+
+with open(args.input, 'r') as i, open(args.output, 'w') as o:
+    o.write(i.read())

test cases/cython/2 generated sources/meson.build

@@ -0,0 +1,61 @@
+project(
+  'generated cython sources',
+  ['cython'],
+)
+
+py_mod = import('python')
+py3 = py_mod.find_installation('python3')
+py3_dep = py3.dependency(required : false)
+if not py3_dep.found()
+  error('MESON_SKIP_TEST: Python library not found.')
+endif
+
+ct = custom_target(
+  'ct',
+  input : 'gen.py',
+  output : 'ct.pyx',
+  command : [py3, '@INPUT@', '@OUTPUT@'],
+)
+
+ct_ext = py3.extension_module('ct', ct, dependencies : py3_dep)
+
+test(
+  'custom target',
+  py3,
+  args : [files('test.py'), 'ct'],
+  env : ['PYTHONPATH=' + meson.current_build_dir()]
+)
+
+cf = configure_file(
+  input : 'configure.pyx.in',
+  output : 'cf.pyx',
+  copy : true,
+)
+
+cf_ext = py3.extension_module('cf', cf, dependencies : py3_dep)
+
+test(
+  'configure file',
+  py3,
+  args : [files('test.py'), 'cf'],
+  env : ['PYTHONPATH=' + meson.current_build_dir()]
+)
+
+gen = generator(
+  find_program('generator.py'),
+  arguments : ['@INPUT@', '@OUTPUT@'],
+  output : '@BASENAME@.pyx',
+)
+
+g_ext = py3.extension_module(
+  'g',
+  gen.process('g.in'),
+  dependencies : py3_dep,
+)
+
+test(
+  'generator',
+  py3,
+  args : [files('test.py'), 'g'],
+  env : ['PYTHONPATH=' + meson.current_build_dir()]
+)

test cases/cython/2 generated sources/test.py

@@ -0,0 +1,13 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: Apache-2.0
+
+import argparse
+import importlib
+
+parser = argparse.ArgumentParser()
+parser.add_argument('mod')
+args = parser.parse_args()
+
+mod = importlib.import_module(args.mod)
+
+assert mod.func() == 'Hello, World!'