3 files changed, 12 insertions, 5 deletions
diff --git a/absl/base/internal/low_level_scheduling.h b/absl/base/internal/low_level_scheduling.h
index 31261298..ed0b4bfa 100644
--- a/absl/base/internal/low_level_scheduling.h
+++ b/absl/base/internal/low_level_scheduling.h
@@ -29,9 +29,6 @@ extern "C" void __google_enable_rescheduling(bool disable_result);
 
 namespace absl {
 ABSL_NAMESPACE_BEGIN
-class CondVar;
-class Mutex;
-
 namespace base_internal {
 
 class SchedulingHelper;  // To allow use of SchedulingGuard.
@@ -80,8 +77,6 @@ class SchedulingGuard {
   };
 
   // Access to SchedulingGuard is explicitly permitted.
-  friend class absl::CondVar;
-  friend class absl::Mutex;
   friend class SchedulingHelper;
   friend class SpinLock;
 
diff --git a/absl/base/internal/spinlock.h b/absl/base/internal/spinlock.h
index 2222398b..e6ac9e64 100644
--- a/absl/base/internal/spinlock.h
+++ b/absl/base/internal/spinlock.h
@@ -64,7 +64,14 @@ class ABSL_LOCKABLE SpinLock {
   constexpr SpinLock(absl::ConstInitType, base_internal::SchedulingMode mode)
       : lockword_(IsCooperative(mode) ? kSpinLockCooperative : 0) {}
 
+  // For global SpinLock instances prefer trivial destructor when possible.
+  // Default but non-trivial destructor in some build configurations causes an
+  // extra static initializer.
+#ifdef ABSL_INTERNAL_HAVE_TSAN_INTERFACE
   ~SpinLock() { ABSL_TSAN_MUTEX_DESTROY(this, __tsan_mutex_not_static); }
+#else
+  ~SpinLock() = default;
+#endif
 
   // Acquire this SpinLock.
   inline void Lock() ABSL_EXCLUSIVE_LOCK_FUNCTION() {
diff --git a/absl/base/spinlock_test_common.cc b/absl/base/spinlock_test_common.cc
index b68c51a1..b33c54ba 100644
--- a/absl/base/spinlock_test_common.cc
+++ b/absl/base/spinlock_test_common.cc
@@ -20,6 +20,7 @@
 #include <limits>
 #include <random>
 #include <thread>  // NOLINT(build/c++11)
+#include <type_traits>
 #include <vector>
 
 #include "gtest/gtest.h"
@@ -103,6 +104,10 @@ static void ThreadedTest(SpinLock* spinlock) {
   }
 }
 
+#ifndef THREAD_SANITIZER
+static_assert(std::is_trivially_destructible<SpinLock>(), "");
+#endif
+
 TEST(SpinLock, StackNonCooperativeDisablesScheduling) {
   SpinLock spinlock(base_internal::SCHEDULE_KERNEL_ONLY);
   spinlock.Lock();