diff --git a/components/libc/compilers/armlibc/mem_std.c b/components/libc/compilers/armlibc/mem_std.c
index fbfd17eee16632748f283d30856b1df9e2010355..f8a81c7873455b6b7c6af013d2f5131d4ba17025 100644
--- a/components/libc/compilers/armlibc/mem_std.c
+++ b/components/libc/compilers/armlibc/mem_std.c
@@ -4,40 +4,68 @@
  * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
- * 2014-08-03     bernard      Add file header.
+ * Date           Author       Notes
+ * 2014-08-03     bernard      Add file header
+ * 2021-11-13     Meco Man     implement no-heap warning
  */
 
 #include <rtthread.h>
 #include <stddef.h>
 
-#ifdef RT_USING_HEAP
+#ifndef RT_USING_HEAP
+#define DBG_TAG    "armlibc.mem"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+
+#define _NO_HEAP_ERROR()  do{LOG_E("Please enable RT_USING_HEAP");\
+                             RT_ASSERT(0);\
+                            }while(0)
+#endif /* RT_USING_HEAP */
 
 #ifdef __CC_ARM
 /* avoid the heap and heap-using library functions supplied by arm */
 #pragma import(__use_no_heap)
-#endif
+#endif /* __CC_ARM */
 
 void *malloc(size_t n)
 {
+#ifdef RT_USING_HEAP
     return rt_malloc(n);
+#else
+    _NO_HEAP_ERROR();
+    return RT_NULL;
+#endif
 }
 RTM_EXPORT(malloc);
 
 void *realloc(void *rmem, size_t newsize)
 {
+#ifdef RT_USING_HEAP
     return rt_realloc(rmem, newsize);
+#else
+    _NO_HEAP_ERROR();
+    return RT_NULL;
+#endif
 }
 RTM_EXPORT(realloc);
 
 void *calloc(size_t nelem, size_t elsize)
 {
+#ifdef RT_USING_HEAP
     return rt_calloc(nelem, elsize);
+#else
+    _NO_HEAP_ERROR();
+    return RT_NULL;
+#endif
 }
 RTM_EXPORT(calloc);
 
 void free(void *rmem)
 {
+#ifdef RT_USING_HEAP
     rt_free(rmem);
+#else
+    _NO_HEAP_ERROR();
+#endif
 }
 RTM_EXPORT(free);
-#endif
diff --git a/components/libc/compilers/armlibc/syscalls.c b/components/libc/compilers/armlibc/syscalls.c
index c8609a92f3f0358265378286330f432666e08a8f..b6448f216531c404badd0418aa47b574dd178923 100644
--- a/components/libc/compilers/armlibc/syscalls.c
+++ b/components/libc/compilers/armlibc/syscalls.c
@@ -25,7 +25,7 @@
 #include "libc.h"
 #endif
 
-#define DBG_TAG    "Keil.armlibc.syscalls"
+#define DBG_TAG    "armlibc.syscalls"
 #define DBG_LVL    DBG_INFO
 #include <rtdbg.h>
 
diff --git a/components/libc/compilers/dlib/syscall_mem.c b/components/libc/compilers/dlib/syscall_mem.c
index 9c6de64455fb70adc1840341b864eae78f2f684b..74b960f0b92380caa8c61e51591138f4febaa897 100644
--- a/components/libc/compilers/dlib/syscall_mem.c
+++ b/components/libc/compilers/dlib/syscall_mem.c
@@ -6,27 +6,55 @@
  * Change Logs:
  * Date           Author       Notes
  * 2015-01-28     Bernard      first version
+ * 2021-11-13     Meco Man     implement no-heap warning
  */
 #include <rtthread.h>
+#include <stddef.h>
 
-#ifdef RT_USING_HEAP
-void *malloc(rt_size_t n)
+#ifndef RT_USING_HEAP
+#define DBG_TAG    "dlib.syscall_mem"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+#define _NO_HEAP_ERROR()  do{LOG_E("Please enable RT_USING_HEAP");\
+                             RT_ASSERT(0);\
+                            }while(0)
+#endif /* RT_USING_HEAP */
+
+void *malloc(size_t n)
 {
+#ifdef RT_USING_HEAP
     return rt_malloc(n);
+#else
+    _NO_HEAP_ERROR();
+    return RT_NULL;
+#endif
 }
 
-void *realloc(void *rmem, rt_size_t newsize)
+void *realloc(void *rmem, size_t newsize)
 {
+#ifdef RT_USING_HEAP
     return rt_realloc(rmem, newsize);
+#else
+    _NO_HEAP_ERROR();
+    return RT_NULL;
+#endif
 }
 
-void *calloc(rt_size_t nelem, rt_size_t elsize)
+void *calloc(size_t nelem, size_t elsize)
 {
+#ifdef RT_USING_HEAP
     return rt_calloc(nelem, elsize);
+#else
+    _NO_HEAP_ERROR();
+    return RT_NULL;
+#endif
 }
 
 void free(void *rmem)
 {
+#ifdef RT_USING_HEAP
     rt_free(rmem);
-}
+#else
+    _NO_HEAP_ERROR();
 #endif
+}
diff --git a/components/libc/compilers/dlib/syscall_write.c b/components/libc/compilers/dlib/syscall_write.c
index c0729afd69b416fc04c303766ee809eef161a49b..9a7707e9d3632fe8542c07b32688e6e15a670dc1 100644
--- a/components/libc/compilers/dlib/syscall_write.c
+++ b/components/libc/compilers/dlib/syscall_write.c
@@ -15,7 +15,7 @@
 #include "libc.h"
 #endif
 
-#define DBG_TAG    "IAR.dlib.syscall_write"
+#define DBG_TAG    "dlib.syscall_write"
 #define DBG_LVL    DBG_INFO
 #include <rtdbg.h>