override ldshared on non-macos platforms too if CC is overriden

distutils/sysconfig.py

@@ -214,10 +214,9 @@ def customize_compiler(compiler):
 
         if 'CC' in os.environ:
             newcc = os.environ['CC']
-            if (sys.platform == 'darwin'
-                    and 'LDSHARED' not in os.environ
+            if('LDSHARED' not in os.environ
                     and ldshared.startswith(cc)):
-                # On OS X, if CC is overridden, use that as the default
+                # If CC is overridden, use that as the default
                 #       command for LDSHARED as well
                 ldshared = newcc + ldshared[len(cc):]
             cc = newcc

distutils/tests/test_unixccompiler.py

@@ -181,8 +181,8 @@ def gcv(v):
         sysconfig.get_config_var = gcv
         self.assertEqual(self.cc.rpath_foo(), '-R/foo')
 
-    @unittest.skipUnless(sys.platform == 'darwin', 'test only relevant for OS X')
-    def test_osx_cc_overrides_ldshared(self):
+    @unittest.skipIf(sys.platform == 'win32', "can't test on Windows")
+    def test_cc_overrides_ldshared(self):
         # Issue #18080:
         # ensure that setting CC env variable also changes default linker
         def gcv(v):
@@ -202,8 +202,8 @@ def gcvs(*args, _orig=sysconfig.get_config_vars):
             sysconfig.customize_compiler(self.cc)
         self.assertEqual(self.cc.linker_so[0], 'my_cc')
 
-    @unittest.skipUnless(sys.platform == 'darwin', 'test only relevant for OS X')
-    def test_osx_explicit_ldshared(self):
+    @unittest.skipIf(sys.platform == 'win32', "can't test on Windows")
+    def test_explicit_ldshared(self):
         # Issue #18080:
         # ensure that setting CC env variable does not change
         #   explicit LDSHARED setting for linker