tests: add a python test for bytecode compilation

Some tweaks are added to the test case so that it supports python2 as
well.

test cases/python/2 extmodule/blaster.py.in

@@ -8,4 +8,4 @@ if not isinstance(result, int):
     raise SystemExit('Returned result not an integer.')
 
 if result != 1:
-    raise SystemExit(f'Returned result {result} is not 1.')
+    raise SystemExit('Returned result {} is not 1.'.format(result))

test cases/python/2 extmodule/ext/meson.build

@@ -4,6 +4,12 @@ pylib = py.extension_module('tachyon',
   install: true,
 )
 
+pylib2 = py2.extension_module('tachyon',
+  'tachyon_module.c',
+  c_args: '-DMESON_MODULENAME="tachyon"',
+  install: true,
+)
+
 subdir('nested')
 subdir('wrongdir')
 pypathdir = meson.current_build_dir()

test cases/python/2 extmodule/ext/nested/meson.build

@@ -13,3 +13,20 @@ py.install_sources(
   pure: false,
   subdir: 'nested',
 )
+
+
+py2.extension_module('tachyon',
+  '../tachyon_module.c',
+  c_args: '-DMESON_MODULENAME="nested.tachyon"',
+  install: true,
+  subdir: 'nested'
+)
+py2.install_sources(
+  configure_file(
+    input: '../../blaster.py.in',
+    output: 'blaster.py',
+    configuration: {'tachyon_module': 'nested.tachyon'}
+  ),
+  pure: false,
+  subdir: 'nested',
+)

test cases/python/2 extmodule/ext/tachyon_module.c

@@ -1,5 +1,5 @@
 /*
-  Copyright 2016 The Meson development team
+  Copyright 2018 The Meson development team
 
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
@@ -27,7 +27,11 @@ static PyObject* phaserize(PyObject *self, PyObject *args) {
         return NULL;
 
     result = strcmp(message, "shoot") ? 0 : 1;
+#if PY_VERSION_HEX < 0x03000000
+    return PyInt_FromLong(result);
+#else
     return PyLong_FromLong(result);
+#endif
 }
 
 static PyMethodDef TachyonMethods[] = {
@@ -36,9 +40,14 @@ static PyMethodDef TachyonMethods[] = {
     {NULL, NULL, 0, NULL}
 };
 
+#if PY_VERSION_HEX < 0x03000000
+PyMODINIT_FUNC inittachyon(void) {
+    Py_InitModule("tachyon", TachyonMethods);
+}
+#else
 static struct PyModuleDef tachyonmodule = {
    PyModuleDef_HEAD_INIT,
-   MESON_MODULENAME,
+   "tachyon",
    NULL,
    -1,
    TachyonMethods
@@ -47,3 +56,4 @@ static struct PyModuleDef tachyonmodule = {
 PyMODINIT_FUNC PyInit_tachyon(void) {
     return PyModule_Create(&tachyonmodule);
 }
+#endif

test cases/python/2 extmodule/ext/wrongdir/meson.build

@@ -4,3 +4,9 @@ py.extension_module('tachyon',
   install: true,
   install_dir: get_option('libdir')
 )
+py2.extension_module('tachyon',
+  '../tachyon_module.c',
+  c_args: '-DMESON_MODULENAME="tachyon"',
+  install: true,
+  install_dir: get_option('libdir')
+)

test cases/python/2 extmodule/meson.build

@@ -10,6 +10,7 @@ endif
 
 py_mod = import('python')
 py = py_mod.find_installation()
+py2 = py_mod.find_installation('python2', required: get_option('python2'), disabler: true)
 py_dep = py.dependency(required: false)
 
 if not py_dep.found()
@@ -31,6 +32,12 @@ test('extmod',
 
 py.install_sources(blaster, pure: false)
 py.install_sources(blaster, subdir: 'pure')
+install_subdir('subinst', install_dir: py.get_install_dir(pure: false))
+
+py2.install_sources(blaster, pure: false)
+py2.install_sources(blaster, subdir: 'pure')
+install_subdir('subinst', install_dir: py2.get_install_dir(pure: false))
+
 
 py3_pkg_dep = dependency('python3', method: 'pkg-config', required : false)
 if py3_pkg_dep.found()

test cases/python/2 extmodule/meson_options.txt

@@ -0,0 +1 @@
+option('python2', type: 'feature', value: 'disabled')

test cases/python/2 extmodule/subinst/printer.py

@@ -0,0 +1,3 @@
+#!/usr/bin/env python3
+
+print('subinst')

test cases/python/2 extmodule/subinst/submod/printer.py

@@ -0,0 +1,3 @@
+#!/usr/bin/env python3
+
+print('subinst.submod')

test cases/python/2 extmodule/test.json

@@ -7,6 +7,8 @@
     { "type": "python_file", "file": "usr/@PYTHON_PLATLIB@/nested/blaster.py" },
     { "type": "python_lib",  "file": "usr/@PYTHON_PLATLIB@/nested/tachyon" },
     { "type": "py_implib",   "file": "usr/@PYTHON_PLATLIB@/nested/tachyon" },
+    { "type": "python_file", "file": "usr/@PYTHON_PLATLIB@/subinst/printer.py" },
+    { "type": "python_file", "file": "usr/@PYTHON_PLATLIB@/subinst/submod/printer.py" },
     { "type": "python_lib",  "file": "usr/lib/tachyon" },
     { "type": "py_implib",   "file": "usr/lib/tachyon" }
   ]

unittests/pythontests.py

@@ -12,18 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
-import unittest
-import pathlib
-import subprocess
+import glob, os, pathlib, shutil, subprocess, unittest
 
 from run_tests import (
     Backend
 )
 
 from .allplatformstests import git_init
-
 from .baseplatformtests import BasePlatformTests
+
 from mesonbuild.mesonlib import TemporaryDirectoryWinProof
 
 class PythonTests(BasePlatformTests):
@@ -60,3 +57,34 @@ python = pymod.find_installation('python3', required: true)
             git_init(dirstr)
             self.init(dirstr)
             subprocess.check_call(self.meson_command + ['dist', '-C', self.builddir], stdout=subprocess.DEVNULL)
+
+    def _test_bytecompile(self, py2=False):
+        testdir = os.path.join(self.src_root, 'test cases', 'python', '2 extmodule')
+
+        self.init(testdir, extra_args=['-Dpython2=auto', '-Dpython.bytecompile=1'])
+        self.build()
+        self.install()
+
+        count = 0
+        for root, dirs, files in os.walk(self.installdir):
+            for file in files:
+                realfile = os.path.join(root, file)
+                if file.endswith('.py'):
+                    cached = glob.glob(realfile+'?') + glob.glob(os.path.join(root, '__pycache__', os.path.splitext(file)[0] + '*.pyc'))
+                    self.assertEqual(len(cached), 2)
+                    count += 1
+        # there are 5 files x 2 installations
+        if py2:
+            self.assertEqual(count, 10)
+        else:
+            self.assertEqual(count, 5)
+
+    def test_bytecompile_multi(self):
+        if not shutil.which('python2'):
+            raise self.skipTest('python2 not installed')
+        self._test_bytecompile(True)
+
+    def test_bytecompile_single(self):
+        if shutil.which('python2'):
+            raise self.skipTest('python2 installed, already tested')
+        self._test_bytecompile()