#### build: Generic definitions## Lots of this code have been borrowed or heavily inspired from parts# of kbuild code, which is not credited, but mostly developed by:## Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015# Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015##### Convenient variablescomma := ,squote := '#### Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.odot-target = $(dir $@).$(notdir $@)#### filename of target with directory and extension strippedbasetarget = $(basename $(notdir $@))#### The temporary file to save gcc -MD generated dependencies must not# contain a commadepfile = $(subst $(comma),_,$(dot-target).d)#### Check if both arguments has same arguments. Result is empty string if equal.arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ $(filter-out $(cmd_$@), $(cmd_$(1))) )#### Escape single quote for use in echo statementsescsq = $(subst $(squote),'\$(squote)',$1)# Echo command# Short version is used, if $(quiet) equals `quiet_', otherwise full one.echo-cmd = $(if $($(quiet)cmd_$(1)),\ echo ' $(call escsq,$($(quiet)cmd_$(1)))';)#### Replace >$< with >$$< to preserve $ when reloading the .cmd file# (needed for make)# Replace >#< with >\#< to avoid starting a comment in the .cmd file# (needed for make)# Replace >'< with >'\''< to be able to enclose the whole string in '...'# (needed for the shell)make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))#### Find any prerequisites that is newer than target or that does not exist.# PHONY targets skipped in both cases.any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)#### if_changed_dep - execute command if any prerequisite is newer than# target, or command line has changed and update# dependencies in the cmd fileif_changed_dep = $(if $(strip $(any-prereq) $(arg-check)), \ @set -e; \ $(echo-cmd) $(cmd_$(1)); \ cat $(depfile) > $(dot-target).cmd; \ printf '%s\n' 'cmd_$@ := $(make-cmd)' >> $(dot-target).cmd)# if_changed - execute command if any prerequisite is newer than# target, or command line has changedif_changed = $(if $(strip $(any-prereq) $(arg-check)), \ @set -e; \ $(echo-cmd) $(cmd_$(1)); \ printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)#### C flags to be used in rule definitions, includes:# - depfile generation# - global $(CFLAGS)# - per target C flags# - per object C flags# - BUILD_STR macro to allow '-D"$(variable)"' constructsc_flags = -Wp,-MD,$(depfile),-MT,$@ $(CFLAGS) -D"BUILD_STR(s)=\#s" $(CFLAGS_$(basetarget).o) $(CFLAGS_$(obj))
###
# build: Generic definitions
#
# Lots of this code have been borrowed or heavily inspired from parts
# of kbuild code, which is not credited, but mostly developed by:
#
# Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
# Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
#
###
# Convenient variables
comma := ,
squote := '
###
# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
dot-target = $(dir $@).$(notdir $@)
###
# filename of target with directory and extension stripped
basetarget = $(basename $(notdir $@))
###
# The temporary file to save gcc -MD generated dependencies must not
# contain a comma
depfile = $(subst $(comma),_,$(dot-target).d)
###
# Check if both arguments has same arguments. Result is empty string if equal.
arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
$(filter-out $(cmd_$@), $(cmd_$(1))) )
###
# Escape single quote for use in echo statements
escsq = $(subst $(squote),'\$(squote)',$1)
# Echo command
# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
echo-cmd = $(if $($(quiet)cmd_$(1)),\
echo ' $(call escsq,$($(quiet)cmd_$(1)))';)
###
# Replace >$< with >$$< to preserve $ when reloading the .cmd file
# (needed for make)
# Replace >#< with >\#< to avoid starting a comment in the .cmd file
# (needed for make)
# Replace >'< with >'\''< to be able to enclose the whole string in '...'
# (needed for the shell)
make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))
###
# Find any prerequisites that is newer than target or that does not exist.
# PHONY targets skipped in both cases.
any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
###
# if_changed_dep - execute command if any prerequisite is newer than
# target, or command line has changed and update
# dependencies in the cmd file
if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)), \
@set -e; \
$(echo-cmd) $(cmd_$(1)); \
cat $(depfile) > $(dot-target).cmd; \
printf '%s\n' 'cmd_$@ := $(make-cmd)' >> $(dot-target).cmd)
# if_changed - execute command if any prerequisite is newer than
# target, or command line has changed
if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
@set -e; \
$(echo-cmd) $(cmd_$(1)); \
printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
###
# C flags to be used in rule definitions, includes:
# - depfile generation
# - global $(CFLAGS)
# - per target C flags
# - per object C flags
# - BUILD_STR macro to allow '-D"$(variable)"' constructs
c_flags = -Wp,-MD,$(depfile),-MT,$@ $(CFLAGS) -D"BUILD_STR(s)=\#s" $(CFLAGS_$(basetarget).o) $(CFLAGS_$(obj))