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-rw-r--r--bsp/frdm-k64f/rtconfig.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/bsp/frdm-k64f/rtconfig.py b/bsp/frdm-k64f/rtconfig.py
index a40c66dcf2..baaf4905fa 100644
--- a/bsp/frdm-k64f/rtconfig.py
+++ b/bsp/frdm-k64f/rtconfig.py
@@ -74,7 +74,7 @@ elif PLATFORM == 'armcc':
EXEC_PATH += '/arm/bin40/'
if BUILD == 'debug':
- CFLAGS += ' -g -O0'
+ CFLAGS += ' --c99 -g -O0'
AFLAGS += ' -g'
else:
CFLAGS += ' -O2'