From a4674f0194067a801f6c6bdb4fc6448e3a40e069 Mon Sep 17 00:00:00 2001
From: Christian Heimes <christian@python.org>
Date: Tue, 15 Mar 2022 22:55:35 +0200
Subject: bpo-40280: Detect presence of time.tzset and thread_time clock
 (GH-31898)

---
 Lib/test/datetimetester.py | 3 +++
 Lib/test/test_strptime.py  | 3 +++
 Lib/test/test_time.py      | 3 ++-
 Modules/timemodule.c       | 4 +++-
 4 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/Lib/test/datetimetester.py b/Lib/test/datetimetester.py
index e208a29..efea40d 100644
--- a/Lib/test/datetimetester.py
+++ b/Lib/test/datetimetester.py
@@ -5856,6 +5856,9 @@ class ZoneInfoTest(unittest.TestCase):
                 ldt = tz.fromutc(udt.replace(tzinfo=tz))
                 self.assertEqual(ldt.fold, 0)
 
+    @unittest.skipUnless(
+        hasattr(time, "tzset"), "time module has no attribute tzset"
+    )
     def test_system_transitions(self):
         if ('Riyadh8' in self.zonename or
             # From tzdata NEWS file:
diff --git a/Lib/test/test_strptime.py b/Lib/test/test_strptime.py
index 55a0f42..e5f75b7 100644
--- a/Lib/test/test_strptime.py
+++ b/Lib/test/test_strptime.py
@@ -390,6 +390,9 @@ class StrptimeTests(unittest.TestCase):
                             "LocaleTime().timezone has duplicate values and "
                              "time.daylight but timezone value not set to -1")
 
+    @unittest.skipUnless(
+        hasattr(time, "tzset"), "time module has no attribute tzset"
+        )
     def test_bad_timezone(self):
         # Explicitly test possibility of bad timezone;
         # when time.tzname[0] == time.tzname[1] and time.daylight
diff --git a/Lib/test/test_time.py b/Lib/test/test_time.py
index 57011d1..faac639 100644
--- a/Lib/test/test_time.py
+++ b/Lib/test/test_time.py
@@ -561,8 +561,9 @@ class TimeTestCase(unittest.TestCase):
             'perf_counter',
             'process_time',
             'time',
-            'thread_time',
         ]
+        if hasattr(time, 'thread_time'):
+            clocks.append('thread_time')
 
         for name in clocks:
             with self.subTest(name=name):
diff --git a/Modules/timemodule.c b/Modules/timemodule.c
index 5b2d9b7..7475ef3 100644
--- a/Modules/timemodule.c
+++ b/Modules/timemodule.c
@@ -1479,7 +1479,9 @@ _PyTime_GetThreadTimeWithInfo(_PyTime_t *tp, _Py_clock_info_t *info)
     return 0;
 }
 
-#elif defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_PROCESS_CPUTIME_ID)
+#elif defined(HAVE_CLOCK_GETTIME) && \
+      defined(CLOCK_PROCESS_CPUTIME_ID) && \
+      !defined(__EMSCRIPTEN__)
 #define HAVE_THREAD_TIME
 
 #if defined(__APPLE__) && defined(__has_attribute) && __has_attribute(availability)
-- 
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