Makefile学习

Posted 2021-01-07 pengdonglin137

1、多个if判断

DEMO := 2

all:
ifeq ($(DEMO), 1)
    @echo "DEMO 1"
else ifeq ($(DEMO), 2)
    @echo "DEMO 2"
else ifeq ($(DEMO), 3)
    @echo "DEMO 3"
else
    @echo "DEMO Other"
endif

 

2、打印变量

DEMO := 1

all:
        @echo $${DEMO} = ${DEMO}
        @echo $$(DEMO) = $(DEMO)

 

3、=、:= 和 ?=

x := 1
y = 1
x ?= 2

all:
        @echo x=$(x)
        @echo y=$(y)

y = 2
y ?= 3

输出：

x=1
y=2

 

 

 

 

 

 

 

 

 

 

 

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