arm920t/interrupts: Move conditional compilation to Makefile
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/cpu/arm920t/Makefile b/cpu/arm920t/Makefile
index e02bc6a..cbb13b2 100644
--- a/cpu/arm920t/Makefile
+++ b/cpu/arm920t/Makefile
@@ -26,10 +26,12 @@
LIB = $(obj)lib$(CPU).a
START = start.o
-COBJS = cpu.o interrupts.o
-SRCS := $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
-OBJS := $(addprefix $(obj),$(COBJS) $(SOBJS))
+COBJS-y += cpu.o
+COBJS-$(CONFIG_USE_IRQ) += interrupts.o
+
+SRCS := $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS-y:.o=.c)
+OBJS := $(addprefix $(obj),$(COBJS-y) $(SOBJS))
START := $(addprefix $(obj),$(START))
all: $(obj).depend $(START) $(LIB)