[kernel][kservice] add RT_WEAK for several functions
@@ -123,7 +123,7 @@ RTM_EXPORT(_rt_errno);
*
* @return the address of source memory
*/
-void *rt_memset(void *s, int c, rt_ubase_t count)
+RT_WEAK void *rt_memset(void *s, int c, rt_ubase_t count)
{
#ifdef RT_USING_TINY_SIZE
char *xs = (char *)s;
@@ -207,7 +207,7 @@ RTM_EXPORT(rt_memset);
*
* @return the address of destination memory
*/
-void *rt_memcpy(void *dst, const void *src, rt_ubase_t count)
+RT_WEAK void *rt_memcpy(void *dst, const void *src, rt_ubase_t count)
{
#ifdef RT_USING_TINY_SIZE
char *tmp = (char *)dst, *s = (char *)src;
@@ -321,7 +321,7 @@ RTM_EXPORT(rt_memmove);
*
* @return the result
*/
-rt_int32_t rt_memcmp(const void *cs, const void *ct, rt_ubase_t count)
+RT_WEAK rt_int32_t rt_memcmp(const void *cs, const void *ct, rt_ubase_t count)
{
const unsigned char *su1, *su2;
int res = 0;
@@ -1187,7 +1187,7 @@ void rt_kputs(const char *str)
*
* @param fmt the format
*/
-void rt_kprintf(const char *fmt, ...)
+RT_WEAK void rt_kprintf(const char *fmt, ...)
{
va_list args;
rt_size_t length;
