From 8ec4b4ff1c89bb280e662b84eba503ca44abe836 Mon Sep 17 00:00:00 2001 From: Sam Ravnborg Date: Mon, 25 Jul 2005 20:10:36 +0000 Subject: kbuild: introduce Kbuild.include Kbuild.include is a placeholder for definitions originally present in both the top-level Makefile and scripts/Makefile.build. There were a slight difference in the filechk definition, so the most videly used version was kept and usr/Makefile was adopted for this syntax. Signed-off-by: Sam Ravnborg --- --- scripts/Kbuild.include | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 96 insertions(+) create mode 100644 scripts/Kbuild.include (limited to 'scripts/Kbuild.include') diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include new file mode 100644 index 000000000000..9087273abf91 --- /dev/null +++ b/scripts/Kbuild.include @@ -0,0 +1,96 @@ +#### +# 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))) -- cgit v1.2.3