gh-88402: Add new sysconfig variables on Windows (GH-110049)

Include/internal/pycore_importdl.h

@@ -0,0 +1,57 @@
+#ifndef Py_INTERNAL_IMPORTDL_H
+#define Py_INTERNAL_IMPORTDL_H
+
+#include "patchlevel.h"           // PY_MAJOR_VERSION
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef Py_BUILD_CORE
+#  error "this header requires Py_BUILD_CORE define"
+#endif
+
+
+extern const char *_PyImport_DynLoadFiletab[];
+
+extern PyObject *_PyImport_LoadDynamicModuleWithSpec(PyObject *spec, FILE *);
+
+typedef PyObject *(*PyModInitFunction)(void);
+
+/* Max length of module suffix searched for -- accommodates "module.slb" */
+#define MAXSUFFIXSIZE 12
+
+#ifdef MS_WINDOWS
+#include <windows.h>
+typedef FARPROC dl_funcptr;
+
+#ifdef _DEBUG
+#  define PYD_DEBUG_SUFFIX "_d"
+#else
+#  define PYD_DEBUG_SUFFIX ""
+#endif
+
+#ifdef Py_NOGIL
+#  define PYD_THREADING_TAG "t"
+#else
+#  define PYD_THREADING_TAG ""
+#endif
+
+#ifdef PYD_PLATFORM_TAG
+#  define PYD_SOABI "cp" Py_STRINGIFY(PY_MAJOR_VERSION) Py_STRINGIFY(PY_MINOR_VERSION) PYD_THREADING_TAG "-" PYD_PLATFORM_TAG
+#else
+#  define PYD_SOABI "cp" Py_STRINGIFY(PY_MAJOR_VERSION) Py_STRINGIFY(PY_MINOR_VERSION) PYD_THREADING_TAG
+#endif
+
+#define PYD_TAGGED_SUFFIX PYD_DEBUG_SUFFIX "." PYD_SOABI ".pyd"
+#define PYD_UNTAGGED_SUFFIX PYD_DEBUG_SUFFIX ".pyd"
+
+#else
+typedef void (*dl_funcptr)(void);
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* !Py_INTERNAL_IMPORTDL_H */

Lib/sysconfig.py

@@ -544,16 +544,20 @@ def _init_posix(vars):
 def _init_non_posix(vars):
     """Initialize the module as appropriate for NT"""
     # set basic install directories
-    import _imp
+    import _winapi
+    import _sysconfig
     vars['LIBDEST'] = get_path('stdlib')
     vars['BINLIBDEST'] = get_path('platstdlib')
     vars['INCLUDEPY'] = get_path('include')
-    try:
-        # GH-99201: _imp.extension_suffixes may be empty when
-        # HAVE_DYNAMIC_LOADING is not set. In this case, don't set EXT_SUFFIX.
-        vars['EXT_SUFFIX'] = _imp.extension_suffixes()[0]
-    except IndexError:
-        pass
+
+    # Add EXT_SUFFIX, SOABI, and Py_NOGIL
+    vars.update(_sysconfig.config_vars())
+
+    vars['LIBDIR'] = _safe_realpath(os.path.join(get_config_var('installed_base'), 'libs'))
+    if hasattr(sys, 'dllhandle'):
+        dllhandle = _winapi.GetModuleFileName(sys.dllhandle)
+        vars['LIBRARY'] = os.path.basename(_safe_realpath(dllhandle))
+        vars['LDLIBRARY'] = vars['LIBRARY']
     vars['EXE'] = '.exe'
     vars['VERSION'] = _PY_VERSION_SHORT_NO_DOT
     vars['BINDIR'] = os.path.dirname(_safe_realpath(sys.executable))

Lib/test/test_sysconfig.py

@@ -17,7 +17,9 @@
                        get_path, get_path_names, _INSTALL_SCHEMES,
                        get_default_scheme, get_scheme_names, get_config_var,
                        _expand_vars, _get_preferred_schemes, _main)
+import _imp
 import _osx_support
+import _sysconfig
 
 
 HAS_USER_BASE = sysconfig._HAS_USER_BASE
@@ -394,6 +396,24 @@ def test_ldshared_value(self):
 
         self.assertIn(ldflags, ldshared)
 
+    @unittest.skipIf(not _imp.extension_suffixes(), "stub loader has no suffixes")
+    def test_soabi(self):
+        soabi = sysconfig.get_config_var('SOABI')
+        self.assertIn(soabi, _imp.extension_suffixes()[0])
+
+    def test_library(self):
+        library = sysconfig.get_config_var('LIBRARY')
+        ldlibrary = sysconfig.get_config_var('LDLIBRARY')
+        major, minor = sys.version_info[:2]
+        if sys.platform == 'win32':
+            self.assertTrue(library.startswith(f'python{major}{minor}'))
+            self.assertTrue(library.endswith('.dll'))
+            self.assertEqual(library, ldlibrary)
+        else:
+            self.assertTrue(library.startswith(f'libpython{major}.{minor}'))
+            self.assertTrue(library.endswith('.a'))
+            self.assertTrue(ldlibrary.startswith(f'libpython{major}.{minor}'))
+
     @unittest.skipUnless(sys.platform == "darwin", "test only relevant on MacOSX")
     @requires_subprocess()
     def test_platform_in_subprocess(self):
@@ -472,10 +492,8 @@ def test_srcdir_independent_of_cwd(self):
 
     @unittest.skipIf(sysconfig.get_config_var('EXT_SUFFIX') is None,
                      'EXT_SUFFIX required for this test')
+    @unittest.skipIf(not _imp.extension_suffixes(), "stub loader has no suffixes")
     def test_EXT_SUFFIX_in_vars(self):
-        import _imp
-        if not _imp.extension_suffixes():
-            self.skipTest("stub loader has no suffixes")
         vars = sysconfig.get_config_vars()
         self.assertEqual(vars['EXT_SUFFIX'], _imp.extension_suffixes()[0])
 

Misc/NEWS.d/next/Library/2023-09-28-12-32-57.gh-issue-88402.hoa3Gx.rst

@@ -0,0 +1,2 @@
+Add new variables to :py:meth:`sysconfig.get_config_vars` on Windows:
+``LIBRARY``, ``LDLIBRARY``, ``LIBDIR``, ``SOABI``, and ``Py_NOGIL``.

Modules/Setup

@@ -155,6 +155,7 @@ PYTHONPATH=$(COREPYTHONPATH)
 #math mathmodule.c
 #mmap mmapmodule.c
 #select selectmodule.c
+#_sysconfig _sysconfig.c
 
 # XML
 #_elementtree _elementtree.c

Modules/Setup.bootstrap.in

@@ -19,6 +19,7 @@ errno errnomodule.c
 _io _io/_iomodule.c _io/iobase.c _io/fileio.c _io/bytesio.c _io/bufferedio.c _io/textio.c _io/stringio.c
 itertools itertoolsmodule.c
 _sre _sre/sre.c
+_sysconfig _sysconfig.c
 _thread _threadmodule.c
 time timemodule.c
 _typing _typingmodule.c

Modules/_sysconfig.c

@@ -0,0 +1,98 @@
+// _sysconfig provides data for the Python sysconfig module
+
+#ifndef Py_BUILD_CORE_BUILTIN
+#  define Py_BUILD_CORE_MODULE 1
+#endif
+
+#include "Python.h"
+
+#include "pycore_importdl.h"   // _PyImport_DynLoadFiletab
+#include "pycore_long.h"       // _PyLong_GetZero, _PyLong_GetOne
+
+
+/*[clinic input]
+module _sysconfig
+[clinic start generated code]*/
+/*[clinic end generated code: output=da39a3ee5e6b4b0d input=0a7c02d3e212ac97]*/
+
+#include "clinic/_sysconfig.c.h"
+
+#ifdef MS_WINDOWS
+static int
+add_string_value(PyObject *dict, const char *key, const char *str_value)
+{
+    PyObject *value = PyUnicode_FromString(str_value);
+    if (value == NULL) {
+        return -1;
+    }
+    int err = PyDict_SetItemString(dict, key, value);
+    Py_DECREF(value);
+    return err;
+}
+#endif
+
+/*[clinic input]
+_sysconfig.config_vars
+
+Returns a dictionary containing build variables intended to be exposed by sysconfig.
+[clinic start generated code]*/
+
+static PyObject *
+_sysconfig_config_vars_impl(PyObject *module)
+/*[clinic end generated code: output=9c41cdee63ea9487 input=391ff42f3af57d01]*/
+{
+    PyObject *config = PyDict_New();
+    if (config == NULL) {
+        return NULL;
+    }
+
+#ifdef MS_WINDOWS
+    if (add_string_value(config, "EXT_SUFFIX", PYD_TAGGED_SUFFIX) < 0) {
+        Py_DECREF(config);
+        return NULL;
+    }
+    if (add_string_value(config, "SOABI", PYD_SOABI) < 0) {
+        Py_DECREF(config);
+        return NULL;
+    }
+#endif
+
+#ifdef Py_NOGIL
+    PyObject *py_nogil = _PyLong_GetOne();
+#else
+    PyObject *py_nogil = _PyLong_GetZero();
+#endif
+    if (PyDict_SetItemString(config, "Py_NOGIL", py_nogil) < 0) {
+        Py_DECREF(config);
+        return NULL;
+    }
+
+    return config;
+}
+
+PyDoc_STRVAR(sysconfig__doc__,
+"A helper for the sysconfig module.");
+
+static struct PyMethodDef sysconfig_methods[] = {
+    _SYSCONFIG_CONFIG_VARS_METHODDEF
+    {NULL, NULL}
+};
+
+static PyModuleDef_Slot sysconfig_slots[] = {
+    {Py_mod_multiple_interpreters, Py_MOD_PER_INTERPRETER_GIL_SUPPORTED},
+    {0, NULL}
+};
+
+static PyModuleDef sysconfig_module = {
+    .m_base = PyModuleDef_HEAD_INIT,
+    .m_name = "_sysconfig",
+    .m_doc = sysconfig__doc__,
+    .m_methods = sysconfig_methods,
+    .m_slots = sysconfig_slots,
+};
+
+PyMODINIT_FUNC
+PyInit__sysconfig(void)
+{
+    return PyModuleDef_Init(&sysconfig_module);
+}

PC/config.c

@@ -22,6 +22,7 @@ extern PyObject* PyInit__sha1(void);
 extern PyObject* PyInit__sha2(void);
 extern PyObject* PyInit__sha3(void);
 extern PyObject* PyInit__statistics(void);
+extern PyObject* PyInit__sysconfig(void);
 extern PyObject* PyInit__typing(void);
 extern PyObject* PyInit__blake2(void);
 extern PyObject* PyInit_time(void);
@@ -102,6 +103,7 @@ struct _inittab _PyImport_Inittab[] = {
     {"_sha2", PyInit__sha2},
     {"_sha3", PyInit__sha3},
     {"_blake2", PyInit__blake2},
+    {"_sysconfig", PyInit__sysconfig},
     {"time", PyInit_time},
     {"_thread", PyInit__thread},
     {"_tokenize", PyInit__tokenize},

PCbuild/pythoncore.vcxproj

@@ -240,6 +240,7 @@
     <ClInclude Include="..\Include\internal\pycore_hashtable.h" />
     <ClInclude Include="..\Include\internal\pycore_identifier.h" />
     <ClInclude Include="..\Include\internal\pycore_import.h" />
+    <ClInclude Include="..\Include\internal\pycore_importdl.h" />
     <ClInclude Include="..\Include\internal\pycore_initconfig.h" />
     <ClInclude Include="..\Include\internal\pycore_interp.h" />
     <ClInclude Include="..\Include\internal\pycore_intrinsics.h" />
@@ -367,7 +368,6 @@
     <ClInclude Include="..\PC\errmap.h" />
     <ClInclude Include="..\PC\pyconfig.h" />
     <ClInclude Include="..\Python\condvar.h" />
-    <ClInclude Include="..\Python\importdl.h" />
     <ClInclude Include="..\Python\stdlib_module_names.h" />
     <ClInclude Include="..\Python\thread_nt.h" />
   </ItemGroup>
@@ -438,6 +438,7 @@
     <ClCompile Include="..\Modules\signalmodule.c" />
     <ClCompile Include="..\Modules\_statisticsmodule.c" />
     <ClCompile Include="..\Modules\symtablemodule.c" />
+    <ClCompile Include="..\Modules\_sysconfig.c" />
     <ClCompile Include="..\Modules\_threadmodule.c" />
     <ClCompile Include="..\Modules\_tracemalloc.c" />
     <ClCompile Include="..\Modules\_typingmodule.c" />

PCbuild/pythoncore.vcxproj.filters

@@ -300,9 +300,6 @@
     <ClInclude Include="..\PC\pyconfig.h">
       <Filter>PC</Filter>
     </ClInclude>
-    <ClInclude Include="..\Python\importdl.h">
-      <Filter>Python</Filter>
-    </ClInclude>
     <ClInclude Include="..\Python\stdlib_module_names.h">
       <Filter>Python</Filter>
     </ClInclude>
@@ -633,6 +630,9 @@
     <ClInclude Include="..\Include\internal\pycore_import.h">
       <Filter>Include\internal</Filter>
     </ClInclude>
+    <ClInclude Include="..\Include\internal\pycore_importdl.h">
+      <Filter>Include\internal</Filter>
+    </ClInclude>
     <ClInclude Include="..\Include\internal\pycore_initconfig.h">
       <Filter>Include\internal</Filter>
     </ClInclude>
@@ -959,6 +959,9 @@
     <ClCompile Include="..\Modules\symtablemodule.c">
       <Filter>Modules</Filter>
     </ClCompile>
+    <ClCompile Include="..\Modules\_sysconfig.c">
+      <Filter>Modules</Filter>
+    </ClCompile>
     <ClCompile Include="..\Modules\_threadmodule.c">
       <Filter>Modules</Filter>
     </ClCompile>

Python/dynload_hpux.c

@@ -5,7 +5,7 @@
 #include <errno.h>
 
 #include "Python.h"
-#include "importdl.h"
+#include "pycore_importdl.h"
 
 #if defined(__hp9000s300)
 #define FUNCNAME_PATTERN "_%.20s_%.200s"

Python/dynload_shlib.c

@@ -4,7 +4,7 @@
 #include "Python.h"
 #include "pycore_interp.h"    // _PyInterpreterState.dlopenflags
 #include "pycore_pystate.h"   // _PyInterpreterState_GET()
-#include "importdl.h"
+#include "pycore_importdl.h"
 
 #include <sys/types.h>
 #include <sys/stat.h>

Python/dynload_stub.c

@@ -3,7 +3,7 @@
    not present. */
 
 #include "Python.h"
-#include "importdl.h"
+#include "pycore_importdl.h"
 
 
 const char *_PyImport_DynLoadFiletab[] = {NULL};