1：如果在当前目录中直接make的话使用下列代码：

#General Purpose Makefile by guoqingbo

objects := $(patsubst %.c,%.o,$(wildcard *.c))
executables := $(patsubst %.c,%,$(wildcard *.c))

all : $(objects)
$(objects) : %.o: %.c
gcc -c $< -o $@
gcc $< -o $(subst .o, ,$@)
clean :
@rm -rf *.o *~
@rm -rf ${executables}
.PHONY : clean

2：后来发现下列代码也可以有相同效果，难道使用了什么默认规则，还不是很明白，先记录下来：

#General Purpose Makefile by guoqingbo

executables := $(patsubst %.c,%,$(wildcard *.c))

all : $(executables)

clean :
@rm -rf *.o *~
@rm -rf ${executables}
.PHONY : clean