zooba · Apr 25, 2019 · Aug 2, 2018 · Apr 19, 2019 · Apr 19, 2019 · Apr 22, 2019
diff --git a/Doc/library/platform.rst b/Doc/library/platform.rst
@@ -216,6 +216,17 @@ Windows Platform
       later (support for this was added in Python 2.6). It obviously
       only runs on Win32 compatible platforms.
 
+.. function:: win32_edition()
+
+   Returns a string representing the current Windows edition.  Possible
+   values include but are not limited to ``'Enterprise'``, ``'IoTUAP'``,
+   ``'ServerStandard'``, and ``'nanoserver'``.
+
+.. function:: win32_is_iot()
+
+   Returns True if the windows edition returned by win32_edition is recognized 
+   as an IoT edition.
+
 
 Mac OS Platform
 ---------------

diff --git a/Lib/distutils/_msvccompiler.py b/Lib/distutils/_msvccompiler.py
@@ -89,13 +89,24 @@ def _find_vc2017():
 
     return None, None
 
+PLAT_SPEC_TO_RUNTIME = {
+    'x86' : 'x86',
+    'x86_amd64' : 'x64',
+    'x86_arm' : 'arm',
+}
+
 def _find_vcvarsall(plat_spec):
     _, best_dir = _find_vc2017()
     vcruntime = None
-    vcruntime_plat = 'x64' if 'amd64' in plat_spec else 'x86'
+
+    if plat_spec in PLAT_SPEC_TO_RUNTIME:
+        vcruntime_plat = PLAT_SPEC_TO_RUNTIME[plat_spec]
+    else:
+        vcruntime_plat = 'x64' if 'amd64' in plat_spec else 'x86'
+
     if best_dir:
         vcredist = os.path.join(best_dir, "..", "..", "redist", "MSVC", "**",
-            "Microsoft.VC141.CRT", "vcruntime140.dll")
+            vcruntime_plat, "Microsoft.VC141.CRT", "vcruntime140.dll")
         try:
             import glob
             vcruntime = glob.glob(vcredist, recursive=True)[-1]
@@ -178,6 +189,7 @@ def _find_exe(exe, paths=None):
 PLAT_TO_VCVARS = {
     'win32' : 'x86',
     'win-amd64' : 'x86_amd64',
+    'win-arm32' : 'x86_arm',
 }
 
 # A set containing the DLLs that are guaranteed to be available for

diff --git a/Lib/distutils/sysconfig.py b/Lib/distutils/sysconfig.py
@@ -15,6 +15,7 @@
 import sys
 
 from .errors import DistutilsPlatformError
+from .util import get_platform, get_host_platform
 
 # These are needed in a couple of spots, so just compute them once.
 PREFIX = os.path.normpath(sys.prefix)
@@ -449,7 +450,15 @@ def _init_nt():
     # XXX hmmm.. a normal install puts include files here
     g['INCLUDEPY'] = get_python_inc(plat_specific=0)
 
-    g['EXT_SUFFIX'] = _imp.extension_suffixes()[0]
+    # if cross-compiling replace hardcoded platform-specific EXT_SUFFIX
+    # with an EXT_SUFFIX that matches the target platform
+    if get_platform() == get_host_platform():
+        g['EXT_SUFFIX'] = _imp.extension_suffixes()[0]
+    else:
+        plat_tag = get_platform().replace('-', '_')
+        host_plat_tag = get_host_platform().replace('-', '_')
+        g['EXT_SUFFIX'] = _imp.extension_suffixes()[0].replace(host_plat_tag, plat_tag)
+
     g['EXE'] = ".exe"
     g['VERSION'] = get_python_version().replace(".", "")
     g['BINDIR'] = os.path.dirname(os.path.abspath(sys.executable))

diff --git a/Lib/distutils/util.py b/Lib/distutils/util.py
@@ -15,7 +15,7 @@
 from distutils import log
 from distutils.errors import DistutilsByteCompileError
 
-def get_platform ():
+def get_host_platform ():
     """Return a string that identifies the current platform.  This is used mainly to
     distinguish platform-specific build directories and platform-specific built
     distributions.  Typically includes the OS name and version and the
@@ -38,6 +38,8 @@ def get_platform ():
     if os.name == 'nt':
         if 'amd64' in sys.version.lower():
             return 'win-amd64'
+        if 'arm32' in sys.version.lower():
+            return 'win-arm32'
         return sys.platform
 
     # Set for cross builds explicitly
@@ -90,8 +92,25 @@ def get_platform ():
 
     return "%s-%s-%s" % (osname, release, machine)
 
-# get_platform ()
+# get_host_platform ()
+
+def get_platform ():
+    TARGET_TO_PLAT = {
+        'x86' : 'win32',
+        'x64' : 'win-amd64',
+        'arm' : 'win-arm32',
+    }
+
+    targetPlatformFromEnvironment = os.environ.get('VSCMD_ARG_TGT_ARCH')
 
+    if targetPlatformFromEnvironment != None and targetPlatformFromEnvironment in TARGET_TO_PLAT:
+        targetPlatform = TARGET_TO_PLAT[targetPlatformFromEnvironment]
+    else:
+        targetPlatform = get_host_platform()
+
+    return targetPlatform
+
+# get_platform ()
 
 def convert_path (pathname):
     """Return 'pathname' as a name that will work on the native filesystem,

diff --git a/Lib/platform.py b/Lib/platform.py
@@ -334,6 +334,28 @@ def _syscmd_ver(system='', release='', version='',
     (6, None): "post2012ServerR2",
 }
 
+def win32_is_iot():
+    return win32_edition() in ('IoTUAP', 'NanoServer', 'WindowsCoreHeadless', 'IoTEdgeOS')
+
+def win32_edition():
+    try:
+        from winreg import OpenKeyEx, QueryValueEx, CloseKey, HKEY_LOCAL_MACHINE
+    except ImportError:
+        from _winreg import OpenKeyEx, QueryValueEx, CloseKey, HKEY_LOCAL_MACHINE
+
+    key = None
+    try:
+        key = OpenKeyEx(HKEY_LOCAL_MACHINE,
+                        r'SOFTWARE\Microsoft\Windows NT\CurrentVersion')
+        return QueryValueEx(key, 'EditionId')[0]
+    except OSError:
+        pass
+    finally:
+        if key:
+            CloseKey(key)
+
+    return None
+
 def win32_ver(release='', version='', csd='', ptype=''):
     try:
         from sys import getwindowsversion

diff --git a/Lib/sysconfig.py b/Lib/sysconfig.py
@@ -626,6 +626,8 @@ def get_platform():
     if os.name == 'nt':
         if 'amd64' in sys.version.lower():
             return 'win-amd64'
+        if 'arm32' in sys.version.lower():
+            return 'win-arm32'
         return sys.platform
 
     if os.name != "posix" or not hasattr(os, 'uname'):

diff --git a/Lib/test/test_codecs.py b/Lib/test/test_codecs.py
@@ -27,6 +27,39 @@ def check(input, expect):
         self.assertEqual(coder(input), (expect, len(input)))
     return check
 
+# On small versions of Windows like Windows IoT or Windows Nano Server not all codepages are present
+def is_code_page_present(cp):
+    from ctypes import POINTER, WINFUNCTYPE, windll, WinError, Structure
+    from ctypes.wintypes import BOOL, UINT, BYTE, WCHAR, UINT, DWORD
+
+    MAX_LEADBYTES = 12  # 5 ranges, 2 bytes ea., 0 term.
+    MAX_DEFAULTCHAR = 2 # single or double byte
+    MAX_PATH = 260
+    class CPINFOEXW(ctypes.Structure):
+        _fields_ = [("MaxCharSize", UINT),
+                    ("DefaultChar", BYTE*MAX_DEFAULTCHAR),
+                    ("LeadByte", BYTE*MAX_LEADBYTES),
+                    ("UnicodeDefaultChar", WCHAR),
+                    ("CodePage", UINT),
+                    ("CodePageName", WCHAR*MAX_PATH)]
+
+    prototype = WINFUNCTYPE(BOOL, UINT, DWORD, POINTER(CPINFOEXW))
+    GetCPInfoEx = prototype(("GetCPInfoExW", windll.kernel32))
+
+    def errcheck(result, func, args):
+        if not result:
+            from ctypes import WinError
+            raise OSError(2, "code page not found")
+        return args
+
+    from ctypes import WinError
+    try:
+        GetCPInfoEx.errcheck = errcheck
+        info = CPINFOEXW()
+        GetCPInfoEx(cp,0, info)
+        return True
+    except OSError:
+        return False
 
 class Queue(object):
     """
@@ -3078,9 +3111,21 @@ def test_multibyte_encoding(self):
     def test_code_page_decode_flags(self):
         # Issue #36312: For some code pages (e.g. UTF-7) flags for
         # MultiByteToWideChar() must be set to 0.
+        if support.verbose:
+            sys.stdout.write('\n')
         for cp in (50220, 50221, 50222, 50225, 50227, 50229,
                    *range(57002, 57011+1), 65000):
-            self.assertEqual(codecs.code_page_decode(cp, b'abc'), ('abc', 3))
+            # On small versions of Windows like Windows IoT
+            # not all codepages are present.
+            # A missing codepage causes an OSError exception
+            # so check for the codepage before decoding
+            if is_code_page_present(cp):
+                if support.verbose:
+                    sys.stdout.write("  testing cp={}\n".format(cp))
+                self.assertEqual(codecs.code_page_decode(cp, b'abc'), ('abc', 3))
+            else:
+                if support.verbose:
+                    sys.stdout.write("  skipping cp={}\n".format(cp))
         self.assertEqual(codecs.code_page_decode(42, b'abc'),
                          ('\uf061\uf062\uf063', 3))
 

diff --git a/Lib/test/test_mimetypes.py b/Lib/test/test_mimetypes.py
@@ -6,6 +6,7 @@
 import unittest
 
 from test import support
+from platform import win32_edition
 
 # Tell it we don't know about external files:
 mimetypes.knownfiles = []
@@ -116,6 +117,7 @@ def tearDown(self):
         mimetypes.types_map.clear()
         mimetypes.types_map.update(self.original_types_map)
 
+    @unittest.skipIf(win32_edition() in ('NanoServer', 'WindowsCoreHeadless', 'IoTEdgeOS'), "mime types registry keys not available on NanoServer")
     def test_registry_parsing(self):
         # the original, minimum contents of the MIME database in the
         # Windows registry is undocumented AFAIK.

diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
@@ -28,6 +28,7 @@
 import uuid
 import warnings
 from test import support
+from platform import win32_is_iot
 
 try:
     import resource
@@ -2446,7 +2447,7 @@ def test_bad_fd(self):
         # Return None when an fd doesn't actually exist.
         self.assertIsNone(os.device_encoding(123456))
 
-    @unittest.skipUnless(os.isatty(0) and (sys.platform.startswith('win') or
+    @unittest.skipUnless(os.isatty(0) and not win32_is_iot() and (sys.platform.startswith('win') or
             (hasattr(locale, 'nl_langinfo') and hasattr(locale, 'CODESET'))),
             'test requires a tty and either Windows or nl_langinfo(CODESET)')
     def test_device_encoding(self):

diff --git a/Lib/test/test_startfile.py b/Lib/test/test_startfile.py
@@ -10,6 +10,7 @@
 import unittest
 from test import support
 import os
+import platform
 import sys
 from os import path
 
@@ -20,6 +21,7 @@ class TestCase(unittest.TestCase):
     def test_nonexisting(self):
         self.assertRaises(OSError, startfile, "nonexisting.vbs")
 
+    @unittest.skipIf(platform.win32_is_iot(), "starting files is not supported on Windows IoT Core or nanoserver")
     def test_empty(self):
         # We need to make sure the child process starts in a directory
         # we're not about to delete. If we're running under -j, that

diff --git a/Lib/test/test_sundry.py b/Lib/test/test_sundry.py
@@ -1,5 +1,6 @@
 """Do a minimal test of all the modules that aren't otherwise tested."""
 import importlib
+import platform
 import sys
 from test import support
 import unittest
@@ -25,7 +26,7 @@ def test_untested_modules_can_be_imported(self):
             import distutils.unixccompiler
 
             import distutils.command.bdist_dumb
-            if sys.platform.startswith('win'):
+            if sys.platform.startswith('win') and not platform.win32_is_iot():
                 import distutils.command.bdist_msi
             import distutils.command.bdist
             import distutils.command.bdist_rpm

diff --git a/Lib/test/test_winreg.py b/Lib/test/test_winreg.py
@@ -5,7 +5,7 @@
 import unittest
 from test import support
 import threading
-from platform import machine
+from platform import machine, win32_edition
 
 # Do this first so test will be skipped if module doesn't exist
 support.import_module('winreg', required_on=['win'])
@@ -399,6 +399,7 @@ def test_named_arguments(self):
         DeleteKeyEx(key=HKEY_CURRENT_USER, sub_key=test_key_name,
                     access=KEY_ALL_ACCESS, reserved=0)
 
+    @unittest.skipIf(win32_edition() in ('WindowsCoreHeadless', 'IoTEdgeOS'), "APIs not available on WindowsCoreHeadless")
     def test_reflection_functions(self):
         # Test that we can call the query, enable, and disable functions
         # on a key which isn't on the reflection list with no consequences.

diff --git a/PC/bdist_wininst/bdist_wininst.vcxproj b/PC/bdist_wininst/bdist_wininst.vcxproj
@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|ARM">
+      <Configuration>Debug</Configuration>
+      <Platform>ARM</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Debug|Win32">
       <Configuration>Debug</Configuration>
       <Platform>Win32</Platform>
@@ -9,6 +13,10 @@
       <Configuration>Debug</Configuration>
       <Platform>x64</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="PGInstrument|ARM">
+      <Configuration>PGInstrument</Configuration>
+      <Platform>ARM</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="PGInstrument|Win32">
       <Configuration>PGInstrument</Configuration>
       <Platform>Win32</Platform>
@@ -17,6 +25,10 @@
       <Configuration>PGInstrument</Configuration>
       <Platform>x64</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="PGUpdate|ARM">
+      <Configuration>PGUpdate</Configuration>
+      <Platform>ARM</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="PGUpdate|Win32">
       <Configuration>PGUpdate</Configuration>
       <Platform>Win32</Platform>
@@ -25,6 +37,10 @@
       <Configuration>PGUpdate</Configuration>
       <Platform>x64</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|ARM">
+      <Configuration>Release</Configuration>
+      <Platform>ARM</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Release|Win32">
       <Configuration>Release</Configuration>
       <Platform>Win32</Platform>

diff --git a/PCbuild/build.bat b/PCbuild/build.bat
@@ -41,7 +41,7 @@ echo.
 echo.Available arguments:
 echo.  -c Release ^| Debug ^| PGInstrument ^| PGUpdate
 echo.     Set the configuration (default: Release)
-echo.  -p x64 ^| Win32
+echo.  -p x64 ^| Win32 ^| ARM
 echo.     Set the platform (default: Win32)
 echo.  -t Build ^| Rebuild ^| Clean ^| CleanAll
 echo.     Set the target manually

diff --git a/PCbuild/pcbuild.sln b/PCbuild/pcbuild.sln
@@ -595,16 +595,16 @@ Global
 		{D06B6426-4762-44CC-8BAD-D79052507F2F}.Release|Win32.Build.0 = Release|Win32
 		{D06B6426-4762-44CC-8BAD-D79052507F2F}.Release|x64.ActiveCfg = Release|x64
 		{D06B6426-4762-44CC-8BAD-D79052507F2F}.Release|x64.Build.0 = Release|x64
-		{EB1C19C1-1F18-421E-9735-CAEE69DC6A3C}.Debug|ARM.ActiveCfg = Debug|Win32
+		{EB1C19C1-1F18-421E-9735-CAEE69DC6A3C}.Debug|ARM.ActiveCfg = Debug|ARM
 		{EB1C19C1-1F18-421E-9735-CAEE69DC6A3C}.Debug|Win32.ActiveCfg = Debug|Win32
 		{EB1C19C1-1F18-421E-9735-CAEE69DC6A3C}.Debug|x64.ActiveCfg = Release|x64
-		{EB1C19C1-1F18-421E-9735-CAEE69DC6A3C}.PGInstrument|ARM.ActiveCfg = PGInstrument|Win32
+		{EB1C19C1-1F18-421E-9735-CAEE69DC6A3C}.PGInstrument|ARM.ActiveCfg = PGInstrument|ARM
 		{EB1C19C1-1F18-421E-9735-CAEE69DC6A3C}.PGInstrument|Win32.ActiveCfg = Release|Win32
 		{EB1C19C1-1F18-421E-9735-CAEE69DC6A3C}.PGInstrument|x64.ActiveCfg = Release|x64
-		{EB1C19C1-1F18-421E-9735-CAEE69DC6A3C}.PGUpdate|ARM.ActiveCfg = PGUpdate|Win32
+		{EB1C19C1-1F18-421E-9735-CAEE69DC6A3C}.PGUpdate|ARM.ActiveCfg = PGUpdate|ARM
 		{EB1C19C1-1F18-421E-9735-CAEE69DC6A3C}.PGUpdate|Win32.ActiveCfg = Release|Win32
 		{EB1C19C1-1F18-421E-9735-CAEE69DC6A3C}.PGUpdate|x64.ActiveCfg = Release|x64
-		{EB1C19C1-1F18-421E-9735-CAEE69DC6A3C}.Release|ARM.ActiveCfg = Release|Win32
+		{EB1C19C1-1F18-421E-9735-CAEE69DC6A3C}.Release|ARM.ActiveCfg = Release|ARM
 		{EB1C19C1-1F18-421E-9735-CAEE69DC6A3C}.Release|Win32.ActiveCfg = Release|Win32
 		{EB1C19C1-1F18-421E-9735-CAEE69DC6A3C}.Release|x64.ActiveCfg = Release|x64
 		{447F05A8-F581-4CAC-A466-5AC7936E207E}.Debug|ARM.ActiveCfg = Debug|ARM
@@ -894,6 +894,7 @@ Global
 		{0F6EE4A4-C75F-4578-B4B3-2D64F4B9B782}.PGUpdate|x64.ActiveCfg = PGUpdate|x64
 		{0F6EE4A4-C75F-4578-B4B3-2D64F4B9B782}.PGUpdate|x64.Build.0 = PGUpdate|x64
 		{0F6EE4A4-C75F-4578-B4B3-2D64F4B9B782}.Release|ARM.ActiveCfg = Release|ARM
+		{0F6EE4A4-C75F-4578-B4B3-2D64F4B9B782}.Release|ARM.Build.0 = Release|ARM
 		{0F6EE4A4-C75F-4578-B4B3-2D64F4B9B782}.Release|Win32.ActiveCfg = Release|Win32
 		{0F6EE4A4-C75F-4578-B4B3-2D64F4B9B782}.Release|Win32.Build.0 = Release|Win32
 		{0F6EE4A4-C75F-4578-B4B3-2D64F4B9B782}.Release|x64.ActiveCfg = Release|x64