Index: lib/asan/asan_fake_stack.h
===================================================================
--- lib/asan/asan_fake_stack.h
+++ lib/asan/asan_fake_stack.h
@@ -155,7 +155,7 @@
   void ForEachFakeFrame(RangeIteratorCallback callback, void *arg);
 
  private:
-  FakeStack() { }
+  FakeStack() = default;
   static const uptr kFlagsOffset = 4096;  // This is were the flags begin.
   // Must match the number of uses of DEFINE_STACK_MALLOC_FREE_WITH_CLASS_ID
   COMPILER_CHECK(kNumberOfSizeClasses == 11);
Index: lib/msan/msan_allocator.h
===================================================================
--- lib/msan/msan_allocator.h
+++ lib/msan/msan_allocator.h
@@ -26,7 +26,7 @@
 
  private:
   // These objects are allocated via mmap() and are zero-initialized.
-  MsanThreadLocalMallocStorage() {}
+  MsanThreadLocalMallocStorage() = default;
 };
 
 } // namespace __msan
Index: lib/sanitizer_common/sanitizer_bitvector.h
===================================================================
--- lib/sanitizer_common/sanitizer_bitvector.h
+++ lib/sanitizer_common/sanitizer_bitvector.h
@@ -87,7 +87,7 @@
   // }
   class Iterator {
    public:
-    Iterator() { }
+    Iterator() = default;
     explicit Iterator(const BasicBitVector &bv) : bv_(bv) {}
     bool hasNext() const { return !bv_.empty(); }
     uptr next() { return bv_.getAndClearFirstOne(); }
@@ -273,7 +273,7 @@
   // }
   class Iterator {
    public:
-    Iterator() { }
+    Iterator() = default;
     explicit Iterator(const TwoLevelBitVector &bv) : bv_(bv), i0_(0), i1_(0) {
       it1_.clear();
       it2_.clear();
Index: lib/tsan/rtl/tsan_clock.h
===================================================================
--- lib/tsan/rtl/tsan_clock.h
+++ lib/tsan/rtl/tsan_clock.h
@@ -33,8 +33,7 @@
     ClockElem clock[kClockCount];
   };
 
-  ClockBlock() {
-  }
+  ClockBlock() = default;
 };
 
 typedef DenseSlabAlloc<ClockBlock, 1<<16, 1<<10> ClockAlloc;
Index: lib/tsan/rtl/tsan_mutex.cc
===================================================================
--- lib/tsan/rtl/tsan_mutex.cc
+++ lib/tsan/rtl/tsan_mutex.cc
@@ -126,9 +126,7 @@
 #endif
 }
 
-InternalDeadlockDetector::InternalDeadlockDetector() {
-  // Rely on zero initialization because some mutexes can be locked before ctor.
-}
+InternalDeadlockDetector::InternalDeadlockDetector() = default;
 
 #if SANITIZER_DEBUG && !SANITIZER_GO
 void InternalDeadlockDetector::Lock(MutexType t) {
Index: lib/tsan/rtl/tsan_report.cc
===================================================================
--- lib/tsan/rtl/tsan_report.cc
+++ lib/tsan/rtl/tsan_report.cc
@@ -67,9 +67,7 @@
     : mset(MBlockReportMutex) {
 }
 
-ReportDesc::~ReportDesc() {
-  // FIXME(dvyukov): it must be leaking a lot of memory.
-}
+ReportDesc::~ReportDesc() = default;
 
 #ifndef SANITIZER_GO
 
Index: lib/tsan/rtl/tsan_rtl_thread.cc
===================================================================
--- lib/tsan/rtl/tsan_rtl_thread.cc
+++ lib/tsan/rtl/tsan_rtl_thread.cc
@@ -31,8 +31,7 @@
 }
 
 #ifndef SANITIZER_GO
-ThreadContext::~ThreadContext() {
-}
+ThreadContext::~ThreadContext() = default;
 #endif
 
 void ThreadContext::OnDead() {
Index: lib/ubsan/ubsan_diag.h
===================================================================
--- lib/ubsan/ubsan_diag.h
+++ lib/ubsan/ubsan_diag.h
@@ -150,7 +150,7 @@
 
   /// An individual diagnostic message argument.
   struct Arg {
-    Arg() {}
+    Arg() = default;
     Arg(const char *String) : Kind(AK_String), String(String) {}
     Arg(TypeName TN) : Kind(AK_TypeName), String(TN.getName()) {}
     Arg(UIntMax UInt) : Kind(AK_UInt), UInt(UInt) {}