Add build from llvm

test/helloworld/Makefile

@@ -1,5 +1,7 @@
 export RV_ROOT = ${PWD}/../..
-RV_DESIGN = ${RV_ROOT}/design
+LLVMINSTALL = /home/colin/develop/llvm-build/install
+GCC_PREFIX = /opt/riscv/bin/riscv64-unknown-elf
+
 
 TEST_CFLAGS = -g -O3 -funroll-all-loops
 ABI = -mabi=ilp32 -march=rv32imc
@@ -9,10 +11,10 @@ target = default
 
 # Allow tool override
 VERILATOR = verilator
-GCC_PREFIX = /opt/riscv/bin/riscv64-unknown-elf
 TESTDIR = ${PWD}
 BUILD_DIR = ${TESTDIR}/build
 SWERV_CONFIG = ${TESTDIR}/swerv.config
+RV_DESIGN = ${RV_ROOT}/design
 
 TEST = hello_world
 
@@ -81,10 +83,13 @@ program.hex: $(OFILES) $(LINK)
 	$(GCC_PREFIX)-cpp -I${BUILD_DIR}  $<  > $(BUILD_DIR)/$*.cpp.s
 	$(GCC_PREFIX)-as $(ABI) $(BUILD_DIR)/$*.cpp.s -o $(BUILD_DIR)/$@
 
+##################### llvm hex Build #####################################
+
 %.o : %.c ${BUILD_DIR}/defines.h
-	$(GCC_PREFIX)-gcc -I${BUILD_DIR} ${TEST_CFLAGS} ${ABI} -nostdlib -c $< -o $(BUILD_DIR)/$@
+	$(LLVMINSTALL)/bin/clang --target=riscv32 -march=rv32gc $*.c -c -o $(BUILD_DIR)/$*.o -mno-relax
+	$(LLVMINSTALL)/bin/ld.lld $(BUILD_DIR)/$*.o -o $(BUILD_DIR)/$*
 
 help:
 	@echo Possible targets: verilator help clean all verilator-build program.hex
 
-.PHONY: help clean verilator
+.PHONY: help clean verilator

test/helloworld/hello_world.c

@@ -0,0 +1,11 @@
+// #include <stdio.h>
+
+int add (int a,int b){
+	return a+b;
+}
+
+int main(){
+  //printf("Hello RISCV!\n");
+  int a = add(1,23);
+  return a;
+}

test/helloworld/hello_world.s

@@ -76,6 +76,6 @@ _finish:
 .data
 hw_data:
 .ascii "----------------------------------\n"
-.ascii "Hello World from Colin EH1 @WDC !!\n"
+.ascii "Hello World Colin.liang EH1@WDC !!\n"
 .ascii "----------------------------------\n"
 .byte 0