一份通用的用户态Makefile

###########  target name
# compile all .c file in $(PWD)
SRCS:=$(wildcard ./*.c)  
OBJS := $(SRCS:.c=.o)
OUT := bpool
OUT_LIB := lib
OUT_SO := so

########### cross compiler and  flags
CC := gcc
CFLAGS:= -g -O0
APP_CFLAGS += $(CFLAGS) -DMAINAPP
LIB_CFLAGS := $(CFLAGS)
SO_CFLAGS:=$(CFLAGS) -shared -fpic
LDFLAGS := -lrt -lpthread

### make file  $(warning ) for debug
#tip1:  .FORCE  NO increment but fully compile whatever target or depend is changed?
#tip2:  $@ $^ target and depends

#$(warning ####debug: objs=$(OBJS) )
all: $(OUT)

%.o: %.c
    $(warning #### hide rules for single .c OBJS )
    $(CC) $(APP_CFLAGS)  -o $@ -c $^

$(OUT): $(OBJS)
    @echo @@@@@@@ compile $@
    $(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)

$(OUT_LIB): bufferpool.c
    @echo @@@@@@@ compile test.$@
    $(CC) $(LIB_CFLAGS) -o $(OUT).$@ -c $^

$(OUT_SO): bufferpool.c
    @echo @@@@@@@ compile test.$@
    $(CC) $(SO_CFLAGS) -o $(OUT).$@ -c $^


.PHONY: clean
clean:
    @rm -rf $(OBJS) $(OUT) *.lib *.so