add delay.c as default

components/libc/posix/src/SConscript

@@ -2,7 +2,7 @@
 
 from building import *
 
-src     = ['unistd.c']
+src     = ['unistd.c', 'delay.c']
 cwd     = GetCurrentDir()
 CPPPATH = [cwd]
 
@@ -15,9 +15,6 @@ if GetDepend('RT_USING_POSIX_POLL'):
 if GetDepend('RT_USING_POSIX_SELECT'):
     src += ['select.c']
 
-if GetDepend('RT_USING_POSIX_DELAY'):
-    src += ['delay.c']
-
 group = DefineGroup('POSIX', src, depend = ['RT_USING_POSIX'], CPPPATH = CPPPATH)
 
 Return('group')

components/libc/posix/src/delay.c

@@ -7,6 +7,7 @@
  * Date           Author       Notes
  * 2021-05-07     Meco Man     first Version
  */
+#include <sys/types.h>
 #include <rtthread.h>
 #include <rthw.h>
 #define DBG_TAG    "POSIX.delay"

components/libc/posix/src/unistd.c

@@ -13,7 +13,6 @@
 #include <dfs_private.h>
 #include <sys/errno.h>
 #include <unistd.h>
-#include <delay.h>
 
 /**
  * this function is a POSIX compliant version, which will open a file and

components/net/Kconfig

@@ -41,7 +41,6 @@ config RT_USING_SAL
         config SAL_USING_POSIX
             bool "Enable BSD socket operated by file system API"
             default n
-            select RT_USING_LIBC
             select RT_USING_POSIX
             select RT_USING_POSIX_SELECT
             help