[spi/SConscript] armclang doesn't support --c99 option.
@@ -28,7 +28,7 @@ if GetDepend('RT_USING_SFUD'):
if rtconfig.CROSS_TOOL == 'gcc':
LOCAL_CCFLAGS += ' -std=c99'
elif rtconfig.CROSS_TOOL == 'keil':
- LOCAL_CCFLAGS += ' --c99'
+ LOCAL_CCFLAGS += ' '
src += src_device
