add C compilation test

testbench/basic_test/Makefile

@@ -5,20 +5,19 @@ SOURCE_V = $(wildcard ../../src/*.v ../../src/*.sv)
 SOURCE_V += $(wildcard ../common/*.v) $(wildcard ../common/*.sv)
 LOGS = $(TESTBENCH_V:.sv=.log)
 
-# SOURCE_C = $(wildcard *.c)
-SOURCE_C = 
+SOURCE_C = $(wildcard *.c)
 SOURCE_AS = $(wildcard *.S)
 OBJ = $(notdir $(SOURCE_AS:.S=.o))
 OBJ += $(notdir $(SOURCE_C:.c=.o))
 
-CC = riscv64-linux-gnu-gcc-8
+CC = riscv64-linux-gnu-gcc
 CFLAGS = -march=rv32i -mabi=ilp32
-# CFLAGS = -march=rv64i -mabi=lp64
+#  -static -ffreestanding
 
 CPPFLAGS =
 
 AS = riscv64-linux-gnu-as
-ASFLAGS = $(CFLAGS)
+ASFLAGS = -march=rv32i -mabi=ilp32
 
 LD = riscv64-linux-gnu-ld
 LDFLAGS = -melf32lriscv_ilp32
@@ -36,7 +35,8 @@ LDFLAGS = -melf32lriscv_ilp32
 	$(AS) $(ASFLAGS) $^ -o $@
 
 %.o: %.c
-	$(CC) $(CPPFLAGS) $(CFLAGS) $^ -o $@
+%.s: %.c
+	$(CC) $(CPPFLAGS) $(CFLAGS) -S $^ -o $@
 
 %.elf: %.ld $(OBJ)
 	$(LD) $(LDFLAGS) -T $^ -o $@