diff --git a/openmp/runtime/src/kmp_affinity.cpp b/openmp/runtime/src/kmp_affinity.cpp
--- a/openmp/runtime/src/kmp_affinity.cpp
+++ b/openmp/runtime/src/kmp_affinity.cpp
@@ -4145,14 +4145,19 @@
 int __kmp_aux_get_affinity(void **mask) {
   int gtid;
   int retval;
+#if KMP_OS_WINDOWS || KMP_DEBUG
   kmp_info_t *th;
-
+#endif
   if (!KMP_AFFINITY_CAPABLE()) {
     return -1;
   }
 
   gtid = __kmp_entry_gtid();
+#if KMP_OS_WINDOWS || KMP_DEBUG
   th = __kmp_threads[gtid];
+#else
+  (void)gtid; // unused variable
+#endif
   KMP_DEBUG_ASSERT(th->th.th_affin_mask != NULL);
 
   KA_TRACE(
diff --git a/openmp/runtime/src/kmp_alloc.cpp b/openmp/runtime/src/kmp_alloc.cpp
--- a/openmp/runtime/src/kmp_alloc.cpp
+++ b/openmp/runtime/src/kmp_alloc.cpp
@@ -1924,9 +1924,10 @@
    In debug mode, fill the memory block with 0xEF before call to free(). */
 void ___kmp_free(void *ptr KMP_SRC_LOC_DECL) {
   kmp_mem_descr_t descr;
+#if KMP_DEBUG
   kmp_uintptr_t addr_allocated; // Address returned by malloc().
   kmp_uintptr_t addr_aligned; // Aligned address passed by caller.
-
+#endif
   KE_TRACE(25,
            ("-> __kmp_free( %p ) called from %s:%d\n", ptr KMP_SRC_LOC_PARM));
   KMP_ASSERT(ptr != NULL);
@@ -1938,18 +1939,15 @@
                 "ptr_aligned=%p, size_aligned=%d\n",
                 descr.ptr_allocated, (int)descr.size_allocated,
                 descr.ptr_aligned, (int)descr.size_aligned));
-
+#if KMP_DEBUG
   addr_allocated = (kmp_uintptr_t)descr.ptr_allocated;
   addr_aligned = (kmp_uintptr_t)descr.ptr_aligned;
-
   KMP_DEBUG_ASSERT(addr_aligned % CACHE_LINE == 0);
   KMP_DEBUG_ASSERT(descr.ptr_aligned == ptr);
   KMP_DEBUG_ASSERT(addr_allocated + sizeof(kmp_mem_descr_t) <= addr_aligned);
   KMP_DEBUG_ASSERT(descr.size_aligned < descr.size_allocated);
   KMP_DEBUG_ASSERT(addr_aligned + descr.size_aligned <=
                    addr_allocated + descr.size_allocated);
-
-#ifdef KMP_DEBUG
   memset(descr.ptr_allocated, 0xEF, descr.size_allocated);
 // Fill memory block with 0xEF, it helps catch using freed memory.
 #endif
diff --git a/openmp/runtime/src/kmp_barrier.cpp b/openmp/runtime/src/kmp_barrier.cpp
--- a/openmp/runtime/src/kmp_barrier.cpp
+++ b/openmp/runtime/src/kmp_barrier.cpp
@@ -2162,7 +2162,6 @@
   kmp_info_t *this_thr = __kmp_threads[gtid];
   kmp_team_t *team;
   kmp_uint nproc;
-  kmp_info_t *master_thread;
   int tid;
 #ifdef KMP_DEBUG
   int team_id;
@@ -2184,9 +2183,7 @@
   tid = __kmp_tid_from_gtid(gtid);
 #ifdef KMP_DEBUG
   team_id = team->t.t_id;
-#endif /* KMP_DEBUG */
-  master_thread = this_thr->th.th_team_master;
-#ifdef KMP_DEBUG
+  kmp_info_t *master_thread = this_thr->th.th_team_master;
   if (master_thread != team->t.t_threads[0]) {
     __kmp_print_structure();
   }
@@ -2339,8 +2336,6 @@
       kmp_uint64 cur_time = __itt_get_timestamp();
       ident_t *loc = team->t.t_ident;
       kmp_info_t **other_threads = team->t.t_threads;
-      int nproc = this_thr->th.th_team_nproc;
-      int i;
       switch (__kmp_forkjoin_frames_mode) {
       case 1:
         __kmp_itt_frame_submit(gtid, this_thr->th.th_frame_time, cur_time, 0,
@@ -2357,7 +2352,7 @@
           // Set arrive time to zero to be able to check it in
           // __kmp_invoke_task(); the same is done inside the loop below
           this_thr->th.th_bar_arrive_time = 0;
-          for (i = 1; i < nproc; ++i) {
+          for (kmp_uint i = 1; i < nproc; ++i) {
             delta += (cur_time - other_threads[i]->th.th_bar_arrive_time);
             other_threads[i]->th.th_bar_arrive_time = 0;
           }
diff --git a/openmp/runtime/src/kmp_lock.cpp b/openmp/runtime/src/kmp_lock.cpp
--- a/openmp/runtime/src/kmp_lock.cpp
+++ b/openmp/runtime/src/kmp_lock.cpp
@@ -1344,14 +1344,15 @@
 }
 
 int __kmp_release_queuing_lock(kmp_queuing_lock_t *lck, kmp_int32 gtid) {
-  kmp_info_t *this_thr;
   volatile kmp_int32 *head_id_p = &lck->lk.head_id;
   volatile kmp_int32 *tail_id_p = &lck->lk.tail_id;
 
   KA_TRACE(1000,
            ("__kmp_release_queuing_lock: lck:%p, T#%d entering\n", lck, gtid));
   KMP_DEBUG_ASSERT(gtid >= 0);
-  this_thr = __kmp_thread_from_gtid(gtid);
+#if KMP_DEBUG || DEBUG_QUEUING_LOCKS
+  kmp_info_t *this_thr = __kmp_thread_from_gtid(gtid);
+#endif
   KMP_DEBUG_ASSERT(this_thr != NULL);
 #ifdef DEBUG_QUEUING_LOCKS
   TRACE_LOCK(gtid + 1, "rel ent");
diff --git a/openmp/runtime/src/kmp_runtime.cpp b/openmp/runtime/src/kmp_runtime.cpp
--- a/openmp/runtime/src/kmp_runtime.cpp
+++ b/openmp/runtime/src/kmp_runtime.cpp
@@ -5537,7 +5537,6 @@
   int use_hot_team = team == root->r.r_hot_team;
 #if KMP_NESTED_HOT_TEAMS
   int level;
-  kmp_hot_team_ptr_t *hot_teams;
   if (master) {
     level = team->t.t_active_level - 1;
     if (master->th.th_teams_microtask) { // in teams construct?
@@ -5551,7 +5550,9 @@
         // team_of_workers before the parallel
       } // team->t.t_level will be increased inside parallel
     }
-    hot_teams = master->th.th_hot_teams;
+#if KMP_DEBUG
+    kmp_hot_team_ptr_t *hot_teams = master->th.th_hot_teams;
+#endif
     if (level < __kmp_hot_teams_max_level) {
       KMP_DEBUG_ASSERT(team == hot_teams[level].hot_team);
       use_hot_team = 1;
diff --git a/openmp/runtime/src/kmp_tasking.cpp b/openmp/runtime/src/kmp_tasking.cpp
--- a/openmp/runtime/src/kmp_tasking.cpp
+++ b/openmp/runtime/src/kmp_tasking.cpp
@@ -825,8 +825,9 @@
   kmp_info_t *thread = __kmp_threads[gtid];
   kmp_task_team_t *task_team =
       thread->th.th_task_team; // might be NULL for serial teams...
+#if KMP_DEBUG
   kmp_int32 children = 0;
-
+#endif
   KA_TRACE(10, ("__kmp_task_finish(enter): T#%d finishing task %p and resuming "
                 "task %p\n",
                 gtid, taskdata, resumed_task));
@@ -942,8 +943,10 @@
         taskdata->td_flags.hidden_helper) {
       __kmp_release_deps(gtid, taskdata);
       // Predecrement simulated by "- 1" calculation
-      children =
-          KMP_ATOMIC_DEC(&taskdata->td_parent->td_incomplete_child_tasks) - 1;
+#if KMP_DEBUG
+      children = -1 +
+#endif
+          KMP_ATOMIC_DEC(&taskdata->td_parent->td_incomplete_child_tasks);
       KMP_DEBUG_ASSERT(children >= 0);
       if (taskdata->td_taskgroup)
         KMP_ATOMIC_DEC(&taskdata->td_taskgroup->count);
@@ -2832,15 +2835,14 @@
     // We need to un-mark this victim as a finished victim.  This must be done
     // before releasing the lock, or else other threads (starting with the
     // primary thread victim) might be prematurely released from the barrier!!!
-    kmp_int32 count;
-
-    count = KMP_ATOMIC_INC(unfinished_threads);
-
+#if KMP_DEBUG
+    kmp_int32 count =
+#endif
+        KMP_ATOMIC_INC(unfinished_threads);
     KA_TRACE(
         20,
         ("__kmp_steal_task: T#%d inc unfinished_threads to %d: task_team=%p\n",
          gtid, count + 1, task_team));
-
     *thread_finished = FALSE;
   }
   TCW_4(victim_td->td.td_deque_ntasks, ntasks - 1);
@@ -3032,9 +3034,10 @@
       // done.  This decrement might be to the spin location, and result in the
       // termination condition being satisfied.
       if (!*thread_finished) {
-        kmp_int32 count;
-
-        count = KMP_ATOMIC_DEC(unfinished_threads) - 1;
+#if KMP_DEBUG
+        kmp_int32 count = -1 +
+#endif
+            KMP_ATOMIC_DEC(unfinished_threads);
         KA_TRACE(20, ("__kmp_execute_tasks_template: T#%d dec "
                       "unfinished_threads to %d task_team=%p\n",
                       gtid, count, task_team));
@@ -3885,11 +3888,12 @@
 }
 
 static void __kmp_second_top_half_finish_proxy(kmp_taskdata_t *taskdata) {
+#if KMP_DEBUG
   kmp_int32 children = 0;
-
   // Predecrement simulated by "- 1" calculation
-  children =
-      KMP_ATOMIC_DEC(&taskdata->td_parent->td_incomplete_child_tasks) - 1;
+  children = -1 +
+#endif
+      KMP_ATOMIC_DEC(&taskdata->td_parent->td_incomplete_child_tasks);
   KMP_DEBUG_ASSERT(children >= 0);
 
   // Remove the imaginary children
diff --git a/openmp/runtime/src/z_Linux_util.cpp b/openmp/runtime/src/z_Linux_util.cpp
--- a/openmp/runtime/src/z_Linux_util.cpp
+++ b/openmp/runtime/src/z_Linux_util.cpp
@@ -1051,6 +1051,8 @@
                   "exit_val = %p\n",
                   th->th.th_info.ds.ds_gtid, exit_val));
   }
+#else
+  (void)status; // unused variable
 #endif /* KMP_DEBUG */
 
   KA_TRACE(10, ("__kmp_reap_worker: done reaping T#%d\n",