diff --git a/bsp/imxrt1052-evk/applications/SConscript b/bsp/imxrt1052-evk/applications/SConscript
index 79416cbc8b737455ab112fe5df18042f58e6e718..7725e3b910cb0ee69c8a085412ffccc9684ef75c 100644
--- a/bsp/imxrt1052-evk/applications/SConscript
+++ b/bsp/imxrt1052-evk/applications/SConscript
@@ -7,9 +7,7 @@ src	= Glob('*.c')
 CPPPATH = [cwd, str(Dir('#'))]
 
 # add for startup script 
-if rtconfig.CROSS_TOOL == 'iar':
-    CPPDEFINES = ['_TIMESPEC_DEFINED']
-elif rtconfig.CROSS_TOOL == 'gcc':
+if rtconfig.CROSS_TOOL == 'gcc':
     CPPDEFINES = ['__START=entry']
 else:
     CPPDEFINES = []
diff --git a/bsp/lpc54608-LPCXpresso/applications/SConscript b/bsp/lpc54608-LPCXpresso/applications/SConscript
index ce22322176c972c59b0c9ab2c37ec3986c2d634f..01eb940dfb35f92c503a78b0b49a4354590f9f3a 100644
--- a/bsp/lpc54608-LPCXpresso/applications/SConscript
+++ b/bsp/lpc54608-LPCXpresso/applications/SConscript
@@ -6,12 +6,6 @@ cwd     = os.path.join(str(Dir('#')), 'applications')
 src	= Glob('*.c')
 CPPPATH = [cwd, str(Dir('#'))]
 
-# add for startup script 
-if rtconfig.CROSS_TOOL == 'iar':
-    CPPDEFINES = ['_TIMESPEC_DEFINED']
-else:
-    CPPDEFINES = []
-
-group = DefineGroup('Applications', src, depend = [''], CPPPATH = CPPPATH, CPPDEFINES=CPPDEFINES)
+group = DefineGroup('Applications', src, depend = [''], CPPPATH = CPPPATH)
 
 Return('group')
diff --git a/bsp/stm32f429-apollo/applications/SConscript b/bsp/stm32f429-apollo/applications/SConscript
index c9f4e204a4e031ab304435b764df017ece4e02b8..52ec60a5c6967b08284be3cb5b5b7bdcc47e0b76 100644
--- a/bsp/stm32f429-apollo/applications/SConscript
+++ b/bsp/stm32f429-apollo/applications/SConscript
@@ -8,16 +8,10 @@ application.c
 startup.c
 """)
 
-# add for startup script 
-if rtconfig.CROSS_TOOL == 'iar':
-    CPPDEFINES = ['_TIMESPEC_DEFINED']
-else:
-    CPPDEFINES = []
-
 # add UI engine demo.
 if GetDepend('RT_USING_GUIENGINE'):
     src += ['rtgui_demo.c']
 
-group = DefineGroup('Applications', src, depend = [''], CPPPATH = CPPPATH, CPPDEFINES=CPPDEFINES)
+group = DefineGroup('Applications', src, depend = [''], CPPPATH = CPPPATH)
 
 Return('group')
diff --git a/components/libc/compilers/dlib/sys/time.h b/components/libc/compilers/dlib/sys/time.h
index 2d60b373170cecbad1bb0777c5fb5fba4589b3ee..ac527450640a209237a4b56fecfa86ce08996f3a 100644
--- a/components/libc/compilers/dlib/sys/time.h
+++ b/components/libc/compilers/dlib/sys/time.h
@@ -20,6 +20,10 @@ struct timeval {
 };
 #endif /* _TIMEVAL_DEFINED */
 
+#if defined ( __ICCARM__ ) && (__VER__ >= 8011002)
+#define _TIMESPEC_DEFINED
+#endif
+
 #ifndef _TIMESPEC_DEFINED
 #define _TIMESPEC_DEFINED
 /*