97 lines
3.3 KiB
Plaintext
97 lines
3.3 KiB
Plaintext
####
|
|
# kbuild: Generic definitions
|
|
|
|
# Convinient variables
|
|
comma := ,
|
|
empty :=
|
|
space := $(empty) $(empty)
|
|
|
|
###
|
|
# The temporary file to save gcc -MD generated dependencies must not
|
|
# contain a comma
|
|
depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
|
|
|
|
###
|
|
# filechk is used to check if the content of a generated file is updated.
|
|
# Sample usage:
|
|
# define filechk_sample
|
|
# echo $KERNELRELEASE
|
|
# endef
|
|
# version.h : Makefile
|
|
# $(call filechk,sample)
|
|
# The rule defined shall write to stdout the content of the new file.
|
|
# The existing file will be compared with the new one.
|
|
# - If no file exist it is created
|
|
# - If the content differ the new file is used
|
|
# - If they are equal no change, and no timestamp update
|
|
# - stdin is piped in from the first prerequisite ($<) so one has
|
|
# to specify a valid file as first prerequisite (often the kbuild file)
|
|
define filechk
|
|
$(Q)set -e; \
|
|
echo ' CHK $@'; \
|
|
mkdir -p $(dir $@); \
|
|
$(filechk_$(1)) < $< > $@.tmp; \
|
|
if [ -r $@ ] && cmp -s $@ $@.tmp; then \
|
|
rm -f $@.tmp; \
|
|
else \
|
|
echo ' UPD $@'; \
|
|
mv -f $@.tmp $@; \
|
|
fi
|
|
endef
|
|
|
|
###
|
|
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
|
|
# Usage:
|
|
# $(Q)$(MAKE) $(build)=dir
|
|
build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
|
|
|
|
# If quiet is set, only print short version of command
|
|
cmd = @$(if $($(quiet)cmd_$(1)),\
|
|
echo ' $(subst ','\'',$($(quiet)cmd_$(1)))' &&) $(cmd_$(1))
|
|
|
|
###
|
|
# if_changed - execute command if any prerequisite is newer than
|
|
# target, or command line has changed
|
|
# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
|
|
# including used config symbols
|
|
# if_changed_rule - as if_changed but execute rule instead
|
|
# See Documentation/kbuild/makefiles.txt for more info
|
|
|
|
ifneq ($(KBUILD_NOCMDDEP),1)
|
|
# Check if both arguments has same arguments. Result in empty string if equal
|
|
# User may override this check using make KBUILD_NOCMDDEP=1
|
|
arg-check = $(strip $(filter-out $(1), $(2)) $(filter-out $(2), $(1)) )
|
|
endif
|
|
|
|
# echo command. Short version is $(quiet) equals quiet, otherwise full command
|
|
echo-cmd = $(if $($(quiet)cmd_$(1)), \
|
|
echo ' $(subst ','\'',$($(quiet)cmd_$(1)))';)
|
|
|
|
# function to only execute the passed command if necessary
|
|
# >'< substitution is for echo to work, >$< substitution to preserve $ when reloading .cmd file
|
|
# note: when using inline perl scripts [perl -e '...$$t=1;...'] in $(cmd_xxx) double $$ your perl vars
|
|
#
|
|
if_changed = $(if $(strip $? $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \
|
|
@set -e; \
|
|
$(echo-cmd) \
|
|
$(cmd_$(1)); \
|
|
echo 'cmd_$@ := $(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).cmd)
|
|
|
|
# execute the command and also postprocess generated .d dependencies
|
|
# file
|
|
if_changed_dep = $(if $(strip $? $(filter-out FORCE $(wildcard $^),$^)\
|
|
$(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \
|
|
@set -e; \
|
|
$(echo-cmd) \
|
|
$(cmd_$(1)); \
|
|
scripts/basic/fixdep $(depfile) $@ '$(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).tmp; \
|
|
rm -f $(depfile); \
|
|
mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)
|
|
|
|
# Usage: $(call if_changed_rule,foo)
|
|
# will check if $(cmd_foo) changed, or any of the prequisites changed,
|
|
# and if so will execute $(rule_foo)
|
|
if_changed_rule = $(if $(strip $? $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ),\
|
|
@set -e; \
|
|
$(rule_$(1)))
|