- Issue #16754: Fix the incorrect shared library extension on linux. Introduce

  two makefile macros SHLIB_SUFFIX and EXT_SUFFIX. SO now has the value of
  SHLIB_SUFFIX again (as in 2.x and 3.1). The SO macro is removed in 3.4.

command/build_ext.py

@@ -667,10 +667,10 @@ class build_ext(Command):
         if os.name == "os2":
             ext_path[len(ext_path) - 1] = ext_path[len(ext_path) - 1][:8]
         # extensions in debug_mode are named 'module_d.pyd' under windows
-        so_ext = get_config_var('SO')
+        ext_suffix = get_config_var('EXT_SUFFIX')
         if os.name == 'nt' and self.debug:
-            return os.path.join(*ext_path) + '_d' + so_ext
-        return os.path.join(*ext_path) + so_ext
+            return os.path.join(*ext_path) + '_d' + ext_suffix
+        return os.path.join(*ext_path) + ext_suffix
 
     def get_export_symbols(self, ext):
         """Return the list of symbols that a shared extension has to

sysconfig.py

@@ -170,9 +170,9 @@ def customize_compiler(compiler):
                 _osx_support.customize_compiler(_config_vars)
                 _config_vars['CUSTOMIZED_OSX_COMPILER'] = 'True'
 
-        (cc, cxx, opt, cflags, ccshared, ldshared, so_ext, ar, ar_flags) = \
+        (cc, cxx, opt, cflags, ccshared, ldshared, shlib_suffix, ar, ar_flags) = \
             get_config_vars('CC', 'CXX', 'OPT', 'CFLAGS',
-                            'CCSHARED', 'LDSHARED', 'SO', 'AR', 'ARFLAGS')
+                            'CCSHARED', 'LDSHARED', 'SHLIB_SUFFIX', 'AR', 'ARFLAGS')
 
         newcc = None
         if 'CC' in os.environ:
@@ -211,7 +211,7 @@ def customize_compiler(compiler):
             linker_exe=cc,
             archiver=archiver)
 
-        compiler.shared_lib_extension = so_ext
+        compiler.shared_lib_extension = shlib_suffix
 
 
 def get_config_h_filename():
@@ -466,6 +466,7 @@ def _init_nt():
     g['INCLUDEPY'] = get_python_inc(plat_specific=0)
 
     g['SO'] = '.pyd'
+    g['EXT_SUFFIX'] = '.pyd'
     g['EXE'] = ".exe"
     g['VERSION'] = get_python_version().replace(".", "")
     g['BINDIR'] = os.path.dirname(os.path.abspath(sys.executable))
@@ -485,6 +486,7 @@ def _init_os2():
     g['INCLUDEPY'] = get_python_inc(plat_specific=0)
 
     g['SO'] = '.pyd'
+    g['EXT_SUFFIX'] = '.pyd'
     g['EXE'] = ".exe"
 
     global _config_vars

tests/test_build_ext.py

@@ -318,8 +318,8 @@ class BuildExtTestCase(TempdirManager,
         finally:
             os.chdir(old_wd)
         self.assertTrue(os.path.exists(so_file))
-        so_ext = sysconfig.get_config_var('SO')
-        self.assertTrue(so_file.endswith(so_ext))
+        ext_suffix = sysconfig.get_config_var('EXT_SUFFIX')
+        self.assertTrue(so_file.endswith(ext_suffix))
         so_dir = os.path.dirname(so_file)
         self.assertEqual(so_dir, other_tmp_dir)
 
@@ -328,7 +328,7 @@ class BuildExtTestCase(TempdirManager,
         cmd.run()
         so_file = cmd.get_outputs()[0]
         self.assertTrue(os.path.exists(so_file))
-        self.assertTrue(so_file.endswith(so_ext))
+        self.assertTrue(so_file.endswith(ext_suffix))
         so_dir = os.path.dirname(so_file)
         self.assertEqual(so_dir, cmd.build_lib)
 
@@ -355,7 +355,7 @@ class BuildExtTestCase(TempdirManager,
         self.assertEqual(lastdir, 'bar')
 
     def test_ext_fullpath(self):
-        ext = sysconfig.get_config_vars()['SO']
+        ext = sysconfig.get_config_var('EXT_SUFFIX')
         # building lxml.etree inplace
         #etree_c = os.path.join(self.tmp_dir, 'lxml.etree.c')
         #etree_ext = Extension('lxml.etree', [etree_c])

tests/test_install.py

@@ -23,7 +23,7 @@ from distutils.tests import support
 def _make_ext_name(modname):
     if os.name == 'nt' and sys.executable.endswith('_d.exe'):
         modname += '_d'
-    return modname + sysconfig.get_config_var('SO')
+    return modname + sysconfig.get_config_var('EXT_SUFFIX')
 
 
 class InstallTestCase(support.TempdirManager,