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#簡單的Makefile

#一些安裝的Shell 都改用 Makefile寫了

# ----------------------------------------------

#

#    Sample for Makefile

#    usage: make -f sample.mk

#    default search path: GNUmakefile makefile Makefile

#

# ----------------------------------------------

# ----------------------------------------------

# include file

# export variable

# ----------------------------------------------

ifeq (.config,$(wildcard .config))

   -include .config

endif

export F_PLATFORM=arm

CFLAGS += -Os -I./ -Wall

LDFLAGS += -L/usr/lib

LIBS += -lpthread

# ----------------------------------------------

#

#    # : comment

#    variable

#    := current value

#    ?= set if no value    

#    = last value

#    += add value

# ----------------------------------------------

#    

#    dir setting

#

R_DIR    = $(shell pwd)

#

#    file

#

SAMPLE_TAR := sample.tar.gz

#    

#    config

#

CONFIG_A    := y

#

#    obj

#

OBJ =

ifeq ($(wildcars $(R_DIR)/unpacked),)    

   OBJ   += unpacked

endif

ifeq ($(strip $(CONFIG_A)), y)

   OBJ    += a

endif

ifeq ($(strip $(CONFIG_A)), y)

   OBJ    += b

endif

# ----------------------------------------------

#    format:

#    target: prerequisites(dependency)

#    <tab>command    

#    - : ignore error

#    @ : no marco

# ----------------------------------------------

all:$(OBJ)

   @echo "-------------------- $@ --------------------"

   -ech $(R_DIR)

   @echo $(R_DIR)

a.o:

a:a.o

b:b.o

   $(CC) $(LDFLAGS) $(CFLAGS) -o $@ $<

# ----------------------------------------------

#

# $@ : target

# $? : prerequisites needed to recompile

# $< : first(current) dependency

# $^ : all dependency

# $* : first(current) dependency , no suffix

#

# ----------------------------------------------

# hidden rule

# %.o:%.c

#    $(CC) -c -o $@ $<

# old rule

# .c.o:

#    $(CC) -c -o $*.o $<

# ----------------------------------------------

# compile execute

# gcc -o a a.c

# gcc -o a a.o

# gcc a.c -o a

#

# compile .o

# gcc -c a.c -o a.o

# gcc -c -o a.o a.c

# gcc -c a.c

#

# ----------------------------------------------

unpacked:

   @echo "-------------------- $@ --------------------"

   tar -zxvf $(SAMPLE_TAR)

   touch $(R_DIR)/unpacked

clean:

#    rm -r *.o

# ----------------------------------------------

#

#    .PHONY: for fake target

#

# ----------------------------------------------

.PHONY: all clean

# ----------------------------------------------

#    function

# ----------------------------------------------

define dep1

   @echo "Hello i am $(0),$(1)"

endef

dep2 = ls -l

ftest:

   $(call dep1,"arg1")

   $(call dep2,"arg1")

# ----------------------------------------------

# Built-in variables

# ----------------------------------------------

vtest:

   @echo "-------------------- $@ --------------------"

   @echo AR $(AR)

   @echo AS $(AS)

   @echo CC $(CC)

   @echo CXX $(CXX)

   @echo RM $(RM)

   @echo ARFLAGS $(ARFLAGS)

   @echo CFLAGS $(CFLAGS)

   @echo LDFLAGS $(LDFLAGS)

# ----------------------------------------------

# Built-in function

# ----------------------------------------------

# $(patsubst <pattern>,<replacement>,<text>)

# $(strip <string>)

# $(findstring <find>,<in>) ... search by yourself