bpo-34691: Compile _contextvars module into main Python library (GH-11741)

Author: zooba

Misc/NEWS.d/next/Build/2019-02-02-13-34-05.bpo-34691.B-Lsj4.rst

@@ -0,0 +1,2 @@
+The _contextvars module is now built into the core Python library on
+Windows.

PC/config.c

@@ -72,6 +72,8 @@ extern PyObject* PyInit__string(void);
 extern PyObject* PyInit__stat(void);
 extern PyObject* PyInit__opcode(void);
 
+extern PyObject* PyInit__contextvars(void);
+
 /* tools/freeze/makeconfig.py marker for additional "extern" */
 /* -- ADDMODULE MARKER 1 -- */
 
@@ -164,6 +166,8 @@ struct _inittab _PyImport_Inittab[] = {
     {"_stat", PyInit__stat},
     {"_opcode", PyInit__opcode},
 
+    {"_contextvars", PyInit__contextvars},
+
     /* Sentinel */
     {0, 0}
 };

PCbuild/_contextvars.vcxproj

@@ -50,7 +50,7 @@
     <!-- pyshellext.dll -->
     <Projects Include="pyshellext.vcxproj" />
     <!-- Extension modules -->
-    <ExtensionModules Include="_asyncio;_contextvars;_ctypes;_decimal;_elementtree;_msi;_multiprocessing;_overlapped;pyexpat;_queue;select;unicodedata;winsound" />
+    <ExtensionModules Include="_asyncio;_ctypes;_decimal;_elementtree;_msi;_multiprocessing;_overlapped;pyexpat;_queue;select;unicodedata;winsound" />
     <!-- Extension modules that require external sources -->
     <ExternalModules Include="_bz2;_lzma;_sqlite3" />
     <!-- venv launchers -->

PCbuild/_contextvars.vcxproj.filters

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">
-    <?define exts=pyexpat;select;unicodedata;winsound;_bz2;_elementtree;_socket;_ssl;_msi;_ctypes;_hashlib;_multiprocessing;_lzma;_decimal;_overlapped;_sqlite3;_asyncio;_queue;_contextvars ?>
+    <?define exts=pyexpat;select;unicodedata;winsound;_bz2;_elementtree;_socket;_ssl;_msi;_ctypes;_hashlib;_multiprocessing;_lzma;_decimal;_overlapped;_sqlite3;_asyncio;_queue ?>
     <Fragment>
         <DirectoryRef Id="Lib_venv_scripts_nt" />