Merge commit '79278364898eccc08d6bbe6e956b6774bb332c24' into template-tests

# Conflicts:
#	CI.md
#	test/02_test/test/spam_test.py
#	test/10_cpp_standards/cibuildwheel_test.py

test/test_cpp_standards.py

@@ -105,14 +105,12 @@ def test_cpp14(tmp_path):
 
     # VC++ for Python 2.7 does not support modern standards
     # The manylinux1 docker image does not have a compiler which supports C++11
-    # Python 3.4 and 3.5 are compiled with MSVC 10, which does not support C++14
-    add_env = {'CIBW_SKIP': 'cp27-win* pp27-win32 cp35-win*'}
+    add_env = {'CIBW_SKIP': 'cp27-win* pp27-win32'}
 
     actual_wheels = utils.cibuildwheel_run(project_dir, add_env=add_env)
     expected_wheels = [w for w in utils.expected_wheels('spam', '0.1.0')
                        if 'cp27-cp27m-win' not in w
-                       and 'pp27-pypy_73-win32' not in w
-                       and 'cp35-cp35m-win' not in w]
+                       and 'pp27-pypy_73-win32' not in w]
 
     assert set(actual_wheels) == set(expected_wheels)
 
@@ -139,7 +137,7 @@ def test_cpp17(tmp_path):
     if os.environ.get('APPVEYOR_BUILD_WORKER_IMAGE', '') == 'Visual Studio 2015':
         pytest.skip('Visual Studio 2015 does not support C++17')
 
-    add_env = {'CIBW_SKIP': 'cp27-win* pp27-win32 cp35-win* pp36-win32'}
+    add_env = {'CIBW_SKIP': 'cp27-win* pp27-win32'}
 
     if utils.platform == 'macos':
         add_env['MACOSX_DEPLOYMENT_TARGET'] = '10.13'
@@ -147,8 +145,56 @@ def test_cpp17(tmp_path):
     actual_wheels = utils.cibuildwheel_run(project_dir, add_env=add_env)
     expected_wheels = [w for w in utils.expected_wheels('spam', '0.1.0', macosx_deployment_target='10.13')
                        if 'cp27-cp27m-win' not in w
-                       and 'pp27-pypy_73-win32' not in w
-                       and 'cp35-cp35m-win' not in w
-                       and 'pp36-pypy36_pp73-win32' not in w]
+                       and 'pp27-pypy_73-win32' not in w]
+
+    assert set(actual_wheels) == set(expected_wheels)
+
+
+def test_cpp17_py27_modern_msvc_workaround():
+    # This test checks the workaround for building Python 2.7 wheel with MSVC 14
+
+    if utils.platform != 'windows':
+        pytest.skip('the test is only relevant to the Windows build')
+
+    if os.environ.get('APPVEYOR_BUILD_WORKER_IMAGE', '') == 'Visual Studio 2015':
+        pytest.skip('Visual Studio 2015 does not support C++17')
+
+    # VC++ for Python 2.7 (i.e., MSVC 9) does not support modern standards
+    # This is a workaround which forces distutils/setupstools to a newer version
+    # Wheels compiled need a more modern C++ redistributable installed, which is not
+    # included with Python: see documentation for more info
+    # DISTUTILS_USE_SDK and MSSdk=1 tell distutils/setuptools that we are adding
+    # MSVC's compiler, tools, and libraries to PATH ourselves
+    add_env = {'CIBW_ENVIRONMENT': 'STANDARD=17',
+               'DISTUTILS_USE_SDK': '1', 'MSSdk': '1'}
+
+    # Use existing setuptools code to run Visual Studio's vcvarsall.bat and get the
+    # necessary environment variables, since running vcvarsall.bat in a subprocess
+    # does not keep the relevant environment variables
+    # There are different environment variables for 32-bit/64-bit targets, so we
+    # need to run cibuildwheel twice, once for 32-bit with `vcvarsall.bat x86, and
+    # once for 64-bit with `vcvarsall.bat x64`
+    # In a normal CI setup, just run vcvarsall.bat before running cibuildwheel and set
+    # DISTUTILS_USE_SDK and MSSdk
+    import setuptools
+
+    def add_vcvars(prev_env, platform):
+        vcvarsall_env = setuptools.msvc.msvc14_get_vc_env(platform)
+        env = prev_env.copy()
+        for vcvar in ['path', 'include', 'lib']:
+            env[vcvar] = vcvarsall_env[vcvar]
+        return env
+
+    add_env_x86 = add_vcvars(add_env, 'x86')
+    add_env_x86['CIBW_BUILD'] = '?p27-win32'
+    actual_wheels = utils.cibuildwheel_run(project_dir, add_env=add_env_x86)
+
+    add_env_x64 = add_vcvars(add_env, 'x64')
+    add_env_x64['CIBW_BUILD'] = 'cp27-win_amd64'
+    actual_wheels += utils.cibuildwheel_run(project_dir, add_env=add_env_x64)
+
+    expected_wheels = [w for w in utils.expected_wheels('spam', '0.1.0')
+                       if 'cp27-cp27m-win' in w
+                       or 'pp27-pypy_73-win32' in w]
 
     assert set(actual_wheels) == set(expected_wheels)