From af52a2dcc8c0119eca135cf1c5f66276a8efd5d5 Mon Sep 17 00:00:00 2001
From: Sudar <sudar@sudarmuthu.com>
Date: Sat, 9 Jun 2012 10:59:02 +0530
Subject: [PATCH] Replaced = with += in CPPFLAGS assignment so that we can set
 CPPFLAGS per sketch if needed

---
 arduino-mk/Arduino.mk | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arduino-mk/Arduino.mk b/arduino-mk/Arduino.mk
index 70637ca..315492f 100644
--- a/arduino-mk/Arduino.mk
+++ b/arduino-mk/Arduino.mk
@@ -494,7 +494,8 @@ LIB_OBJS      = $(patsubst $(ARDUINO_LIB_PATH)/%.c,$(OBJDIR)/libs/%.o,$(LIB_C_SR
 USER_LIB_OBJS = $(patsubst $(USER_LIB_PATH)/%.cpp,$(OBJDIR)/libs/%.o,$(USER_LIB_CPP_SRCS)) \
 		$(patsubst $(USER_LIB_PATH)/%.c,$(OBJDIR)/libs/%.o,$(USER_LIB_C_SRCS))
 
-CPPFLAGS      = -mmcu=$(MCU) -DF_CPU=$(F_CPU) -DARDUINO=$(ARDUINO_VERSION) \
+# Using += instead of =, so that CPPFLAGS can be set per sketch level
+CPPFLAGS      += -mmcu=$(MCU) -DF_CPU=$(F_CPU) -DARDUINO=$(ARDUINO_VERSION) \
 			-I. -I$(ARDUINO_CORE_PATH) -I$(ARDUINO_VAR_PATH)/$(VARIANT) \
 			$(SYS_INCLUDES) $(USER_INCLUDES) -g -Os -w -Wall \
 			-ffunction-sections -fdata-sections