cleanup of makefiles

hello-world/Makefile

@@ -1,14 +1,16 @@
 
-TARGET = hello
-C_SRCS += $(wildcard *.c) 
+TARGET  = hello
+C_SRCS  = $(wildcard *.c) 
+#HEADERS = $(wildcard *.h)
 #CFLAGS += -O2 
-#-fno-builtin-printf
 
 BOARD=freedom-e300-hifive1
 LINK_TARGET=link
 RISCV_ARCH=rv32imac
 RISCV_ABI=ilp32
 
+LDFLAGS = -march=$(RISCV_ARCH) -mabi=$(RISCV_ABI) -mcmodel=medany
+
 TOOL_DIR?=/opt/riscv/FreedomStudio/20180122/SiFive/riscv64-unknown-elf-gcc-20171231-x86_64-linux-centos6/bin
 BSP_BASE = ./bsp
 include $(BSP_BASE)/env/common.mk

hello-world/bsp/env/common.mk

@@ -44,6 +44,7 @@ TRIPLET?=riscv64-unknown-elf
 CXX=$(TOOL_DIR)/$(TRIPLET)-c++
 CC=$(TOOL_DIR)/$(TRIPLET)-gcc
 LD=$(TOOL_DIR)/$(TRIPLET)-gcc
+AR=$(TOOL_DIR)/$(TRIPLET)-ar
 
 
 $(TARGET): $(LINK_OBJS) $(LINK_DEPS)
@@ -60,6 +61,6 @@ $(CXX_OBJS): %.o: %.cpp $(HEADERS)
 
 .PHONY: clean
 clean:
-	rm -f $(CLEAN_OBJS)
+	rm -f $(CLEAN_OBJS) $(LIBWRAP)
 
 endif # _SIFIVE_MK_COMMON