diff --git a/testsuites/unittest/basic/exc/smoke/it_test_exc_001.cpp b/testsuites/unittest/basic/exc/smoke/it_test_exc_001.cpp
index c86223f8..1d88aa34 100644
--- a/testsuites/unittest/basic/exc/smoke/it_test_exc_001.cpp
+++ b/testsuites/unittest/basic/exc/smoke/it_test_exc_001.cpp
@@ -30,7 +30,7 @@
  */
 #include "it_test_exc.h"
 
-static int TestCase(void)
+__attribute__((optnone)) static int TestCase(void)
 {
     int ret;
     int status = 0;
diff --git a/testsuites/unittest/basic/exc/smoke/it_test_exc_002.cpp b/testsuites/unittest/basic/exc/smoke/it_test_exc_002.cpp
index 45b941f1..80b9fe06 100644
--- a/testsuites/unittest/basic/exc/smoke/it_test_exc_002.cpp
+++ b/testsuites/unittest/basic/exc/smoke/it_test_exc_002.cpp
@@ -31,7 +31,7 @@
 #include "it_test_exc.h"
 #include "pthread.h"
 
-static void *ThreadFunc2(void *arg)
+__attribute__((optnone)) static void *ThreadFunc2(void *arg)
 {
     while (1) {
     }
@@ -39,7 +39,7 @@ static void *ThreadFunc2(void *arg)
     return nullptr;
 }
 
-static void *ThreadFunc1(void *arg)
+__attribute__((optnone)) static void *ThreadFunc1(void *arg)
 {
     int *test = nullptr;
     *test = 0x1;
@@ -77,7 +77,8 @@ static int TestThread(void)
     return 0;
 }
 
-static int TestCase(void)
+
+__attribute__((optnone)) static int TestCase(void)
 {
     int *test = nullptr;
     int count = 5;
diff --git a/testsuites/unittest/basic/exc/smoke/it_test_exc_003.cpp b/testsuites/unittest/basic/exc/smoke/it_test_exc_003.cpp
index c275cd65..cef01003 100644
--- a/testsuites/unittest/basic/exc/smoke/it_test_exc_003.cpp
+++ b/testsuites/unittest/basic/exc/smoke/it_test_exc_003.cpp
@@ -34,14 +34,15 @@
 #define TEST_THREAD_COUNT 5
 static volatile int g_testCondFlag;
 static int g_count[TEST_THREAD_COUNT];
-static void *ThreadFunc2(void *arg)
+
+__attribute__((optnone)) static void *ThreadFunc2(void *arg)
 {
     int count = *(int *)arg;
     int *test = nullptr;
 
     g_testCondFlag++;
 
-    while (g_testCondFlag < 2) {
+    while (g_testCondFlag < 2) { /* 2, no special meaning  */
     }
 
     *test = 0x1;
@@ -83,7 +84,7 @@ static int TestThread(void)
     return 0;
 }
 
-static int TestCase(void)
+__attribute__((optnone)) static int TestCase(void)
 {
     int *test = nullptr;
     int count = 5;
diff --git a/testsuites/unittest/basic/exc/smoke/it_test_exc_004.cpp b/testsuites/unittest/basic/exc/smoke/it_test_exc_004.cpp
index 21c5d5fd..90bd76d0 100644
--- a/testsuites/unittest/basic/exc/smoke/it_test_exc_004.cpp
+++ b/testsuites/unittest/basic/exc/smoke/it_test_exc_004.cpp
@@ -33,7 +33,7 @@
 
 #define TEST_THREAD_COUNT 5
 
-static int TestThread(void)
+__attribute__((optnone)) static int TestThread(void)
 {
     int ret;
     int *test = nullptr; // For triggering an exceptioin
@@ -53,7 +53,7 @@ static int TestThread(void)
     return 0;
 }
 
-static int TestCase(void)
+__attribute__((optnone)) static int TestCase(void)
 {
     int count = 5;
     int status = 0;
diff --git a/testsuites/unittest/basic/exc/smoke/it_test_exc_005.cpp b/testsuites/unittest/basic/exc/smoke/it_test_exc_005.cpp
index 64c66472..8e00525c 100644
--- a/testsuites/unittest/basic/exc/smoke/it_test_exc_005.cpp
+++ b/testsuites/unittest/basic/exc/smoke/it_test_exc_005.cpp
@@ -30,7 +30,7 @@
  */
 #include "it_test_exc.h"
 
-static void Child(void)
+__attribute__((optnone)) static void Child(void)
 {
     while (1) {
         printf("@@@@@@@@@@@@@ pid : %d getppid : %d @@@@@@@@@@@@@@@@\n", getpid(), getppid());
@@ -41,7 +41,7 @@ static void TestKill(int sig)
     exit(0);
 }
 
-static int TestCase(void)
+__attribute__((optnone)) static int TestCase(void)
 {
     int ret;
     void (*retptr)(int) = NULL;
diff --git a/testsuites/unittest/libc/posix/mqueue/full/It_posix_queue_040.cpp b/testsuites/unittest/libc/posix/mqueue/full/It_posix_queue_040.cpp
index 1612efde..b857eb0c 100644
--- a/testsuites/unittest/libc/posix/mqueue/full/It_posix_queue_040.cpp
+++ b/testsuites/unittest/libc/posix/mqueue/full/It_posix_queue_040.cpp
@@ -30,7 +30,7 @@
  */
 #include "It_posix_queue.h"
 
-static VOID *PthreadF01(VOID *argument)
+__attribute__((optnone)) static VOID *PthreadF01(VOID *argument)
 {
     INT32 i;
     INT32 ret;
@@ -54,7 +54,7 @@ EXIT:
     return NULL;
 }
 
-static VOID *PthreadF02(VOID *argument)
+__attribute__((optnone)) static VOID *PthreadF02(VOID *argument)
 {
     INT32 j, ret;
 
@@ -79,7 +79,7 @@ EXIT:
     return NULL;
 }
 
-static UINT32 Testcase(VOID)
+__attribute__((optnone)) static UINT32 Testcase(VOID)
 {
     pthread_t newTh1, newTh2;
     UINT32 ret;
diff --git a/testsuites/unittest/libc/posix/mqueue/full/It_posix_queue_113.cpp b/testsuites/unittest/libc/posix/mqueue/full/It_posix_queue_113.cpp
index b133bdad..106d6fba 100644
--- a/testsuites/unittest/libc/posix/mqueue/full/It_posix_queue_113.cpp
+++ b/testsuites/unittest/libc/posix/mqueue/full/It_posix_queue_113.cpp
@@ -53,7 +53,6 @@ EXIT:
 static UINT32 Testcase(VOID)
 {
     INT32 ret;
-    UINT32 uret;
     CHAR mqname[MQUEUE_STANDARD_NAME_LENGTH] = "";
     const CHAR *msgptr = MQUEUE_SEND_STRING_TEST;
     pthread_t pthread1;
@@ -92,7 +91,6 @@ static UINT32 Testcase(VOID)
     ICUNIT_GOTO_EQUAL(ret, MQUEUE_NO_ERROR, ret, EXIT2);
 
     usleep(0);
-    ICUNIT_GOTO_EQUAL(uret, MQUEUE_NO_ERROR, uret, EXIT2);
 
     ret = pthread_join(pthread1, NULL);
     ICUNIT_GOTO_EQUAL(ret, MQUEUE_NO_ERROR, ret, EXIT2);
diff --git a/testsuites/unittest/process/basic/process/smoke/process_test_008.cpp b/testsuites/unittest/process/basic/process/smoke/process_test_008.cpp
index 8dc7b18b..aba4a9aa 100644
--- a/testsuites/unittest/process/basic/process/smoke/process_test_008.cpp
+++ b/testsuites/unittest/process/basic/process/smoke/process_test_008.cpp
@@ -32,19 +32,19 @@
 
 static const int TEST_COUNT = 10;
 
-static void *ThreadFunc2(void *arg)
+__attribute__((optnone)) static void *ThreadFunc2(void *arg)
 {
     printf("111111111111111: exit\n");
     exit(254); // 254, exit args
 }
 
-static void *ThreadFunc3(void *arg)
+__attribute__((optnone)) static void *ThreadFunc3(void *arg)
 {
     while (1) {
     }
 }
 
-static int ProcessTest001(void)
+__attribute__((optnone)) static int ProcessTest001(void)
 {
     int ret;
     int status;
@@ -81,7 +81,7 @@ static int ProcessTest001(void)
     return 0;
 }
 
-static int Testcase(void)
+__attribute__((optnone)) static int Testcase(void)
 {
     int ret;
     int status;