Port import fixes from 2.7.

Lib/importlib/test/source/test_file_loader.py

@@ -138,7 +138,7 @@ class SimpleTest(unittest.TestCase):
             with open(source, 'w') as f:
                 f.write("x = 5")
             try:
-                os.utime(source, (2 ** 33, 2 ** 33))
+                os.utime(source, (2 ** 33 - 5, 2 ** 33 - 5))
             except OverflowError:
                 self.skipTest("cannot set modification time to large integer")
             except OSError as e:

Lib/test/test_import.py

@@ -321,7 +321,7 @@ class ImportTests(unittest.TestCase):
             with open(source, 'w') as f:
                 pass
             try:
-                os.utime(source, (2 ** 33, 2 ** 33))
+                os.utime(source, (2 ** 33 - 5, 2 ** 33 - 5))
             except OverflowError:
                 self.skipTest("cannot set modification time to large integer")
             except OSError as e:

Python/import.c

@@ -1226,9 +1226,9 @@ write_compiled_module(PyCodeObject *co, char *cpathname, struct stat *srcstat)
         (void) unlink(cpathname);
         return;
     }
-    /* Now write the true mtime */
+    /* Now write the true mtime (as a 32-bit field) */
     fseek(fp, 4L, 0);
-    assert(mtime < LONG_MAX);
+    assert(mtime <= 0xFFFFFFFF);
     PyMarshal_WriteLongToFile((long)mtime, fp, Py_MARSHAL_VERSION);
     fflush(fp);
     fclose(fp);
@@ -1302,14 +1302,14 @@ load_source_module(char *name, char *pathname, FILE *fp)
                      pathname);
         return NULL;
     }
-#if SIZEOF_TIME_T > 4
+    if (sizeof st.st_mtime > 4) {
         /* Python's .pyc timestamp handling presumes that the timestamp fits
            in 4 bytes. Since the code only does an equality comparison,
            ordering is not important and we can safely ignore the higher bits
            (collisions are extremely unlikely).
          */
         st.st_mtime &= 0xFFFFFFFF;
-#endif
+    }
     cpathname = make_compiled_pathname(
         pathname, buf, (size_t)MAXPATHLEN + 1, !Py_OptimizeFlag);
     if (cpathname != NULL &&