linux-imx

####

# kbuild: Generic definitions

​

# Convenient variables

comma   := ,

quote   := "

squote  := '

empty   :=

space   := $(empty) $(empty)

space_escape := _-_SPACE_-_

pound := \#

​

###

# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o

dot-target = $(dir $@).$(notdir $@)

​

###

# The temporary file to save gcc -MD generated dependencies must not

# contain a comma

depfile = $(subst $(comma),_,$(dot-target).d)

​

###

# filename of target with directory and extension stripped

basetarget = $(basename $(notdir $@))

​

###

# real prerequisites without phony targets

real-prereqs = $(filter-out $(PHONY), $^)

​

###

# Escape single quote for use in echo statements

escsq = $(subst $(squote),'\$(squote)',$1)

​

###

# Easy method for doing a status message

       kecho := :

 quiet_kecho := echo

silent_kecho := :

kecho := $($(quiet)kecho)

​

###

# filechk is used to check if the content of a generated file is updated.

# Sample usage:

#

# filechk_sample = echo $(KERNELRELEASE)

# version.h: FORCE

#   $(call filechk,sample)

#

# The rule defined shall write to stdout the content of the new file.

# The existing file will be compared with the new one.

# - If no file exist it is created

# - If the content differ the new file is used

# - If they are equal no change, and no timestamp update

# - stdin is piped in from the first prerequisite ($<) so one has

#   to specify a valid file as first prerequisite (often the kbuild file)

define filechk

    $(Q)set -e;             \

    mkdir -p $(dir $@);         \

    { $(filechk_$(1)); } > $@.tmp;      \

    if [ -r $@ ] && cmp -s $@ $@.tmp; then  \

        rm -f $@.tmp;           \

    else                    \

        $(kecho) '  UPD     $@';    \