213 lines
8.2 KiB
Plaintext
213 lines
8.2 KiB
Plaintext
####
|
|
# kbuild: Generic definitions
|
|
|
|
# Convinient variables
|
|
comma := ,
|
|
squote := '
|
|
empty :=
|
|
space := $(empty) $(empty)
|
|
|
|
###
|
|
# 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 $@))
|
|
|
|
###
|
|
# Escape single quote for use in echo statements
|
|
escsq = $(subst $(squote),'\$(squote)',$1)
|
|
|
|
###
|
|
# 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
|
|
|
|
######
|
|
# gcc support functions
|
|
# See documentation in Documentation/kbuild/makefiles.txt
|
|
|
|
# as-option
|
|
# Usage: cflags-y += $(call as-option, -Wa$(comma)-isa=foo,)
|
|
|
|
as-option = $(shell if $(CC) $(CFLAGS) $(1) -Wa,-Z -c -o /dev/null \
|
|
-xassembler /dev/null > /dev/null 2>&1; then echo "$(1)"; \
|
|
else echo "$(2)"; fi ;)
|
|
|
|
# as-instr
|
|
# Usage: cflags-y += $(call as-instr, instr, option1, option2)
|
|
|
|
as-instr = $(shell if echo -e "$(1)" | $(AS) >/dev/null 2>&1 -W -Z -o astest$$$$.out ; \
|
|
then echo "$(2)"; else echo "$(3)"; fi; \
|
|
rm -f astest$$$$.out)
|
|
|
|
# cc-option
|
|
# Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586)
|
|
|
|
cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
|
|
> /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
|
|
|
|
# cc-option-yn
|
|
# Usage: flag := $(call cc-option-yn, -march=winchip-c6)
|
|
cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
|
|
> /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
|
|
|
|
# cc-option-align
|
|
# Prefix align with either -falign or -malign
|
|
cc-option-align = $(subst -functions=0,,\
|
|
$(call cc-option,-falign-functions=0,-malign-functions=0))
|
|
|
|
# cc-version
|
|
# Usage gcc-ver := $(call cc-version, $(CC))
|
|
cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
|
|
|
|
# cc-ifversion
|
|
# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
|
|
cc-ifversion = $(shell if [ $(call cc-version, $(CC)) $(1) $(2) ]; then \
|
|
echo $(3); fi;)
|
|
|
|
# ld-option
|
|
# Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both)
|
|
ld-option = $(shell if $(CC) $(1) \
|
|
-nostdlib -o ldtest$$$$.out -xc /dev/null \
|
|
> /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi; \
|
|
rm -f ldtest$$$$.out)
|
|
|
|
###
|
|
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
|
|
# Usage:
|
|
# $(Q)$(MAKE) $(build)=dir
|
|
build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
|
|
|
|
# Prefix -I with $(srctree) if it is not an absolute path
|
|
addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)
|
|
# Find all -I options and call addtree
|
|
flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
|
|
|
|
# If quiet is set, only print short version of command
|
|
cmd = @$(echo-cmd) $(cmd_$(1))
|
|
|
|
# Add $(obj)/ for paths that is not absolute
|
|
objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
|
|
|
|
###
|
|
# if_changed - execute command if any prerequisite is newer than
|
|
# target, or command line has changed
|
|
# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
|
|
# including used config symbols
|
|
# if_changed_rule - as if_changed but execute rule instead
|
|
# See Documentation/kbuild/makefiles.txt for more info
|
|
|
|
ifneq ($(KBUILD_NOCMDDEP),1)
|
|
# Check if both arguments has same arguments. Result in empty string if equal
|
|
# User may override this check using make KBUILD_NOCMDDEP=1
|
|
arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
|
|
$(filter-out $(cmd_$@), $(cmd_$(1))) )
|
|
endif
|
|
|
|
# echo command. Short version is $(quiet) equals quiet, otherwise full command
|
|
echo-cmd = $(if $($(quiet)cmd_$(1)), \
|
|
echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
|
|
|
|
# >'< substitution is for echo to work,
|
|
# >$< substitution to preserve $ when reloading .cmd file
|
|
# note: when using inline perl scripts [perl -e '...$$t=1;...']
|
|
# in $(cmd_xxx) double $$ your perl vars
|
|
make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(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 $^),$^)
|
|
|
|
# Execute command if command has changed or prerequisitei(s) are updated
|
|
#
|
|
if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
|
|
@set -e; \
|
|
$(echo-cmd) $(cmd_$(1)); \
|
|
echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
|
|
|
|
# execute the command and also postprocess generated .d dependencies
|
|
# file
|
|
if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
|
|
@set -e; \
|
|
$(echo-cmd) $(cmd_$(1)); \
|
|
scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
|
|
rm -f $(depfile); \
|
|
mv -f $(dot-target).tmp $(dot-target).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 $(any-prereq) $(arg-check) ), \
|
|
@set -e; \
|
|
$(rule_$(1)))
|
|
|
|
###
|
|
# why - tell why a a target got build
|
|
# enabled by make V=2
|
|
# Output (listed in the order they are checked):
|
|
# (1) - due to target is PHONY
|
|
# (2) - due to target missing
|
|
# (3) - due to: file1.h file2.h
|
|
# (4) - due to command line change
|
|
# (5) - due to missing .cmd file
|
|
# (6) - due to target not in $(targets)
|
|
# (1) PHONY targets are always build
|
|
# (2) No target, so we better build it
|
|
# (3) Prerequisite is newer than target
|
|
# (4) The command line stored in the file named dir/.target.cmd
|
|
# differed from actual command line. This happens when compiler
|
|
# options changes
|
|
# (5) No dir/.target.cmd file (used to store command line)
|
|
# (6) No dir/.target.cmd file and target not listed in $(targets)
|
|
# This is a good hint that there is a bug in the kbuild file
|
|
ifeq ($(KBUILD_VERBOSE),2)
|
|
why = \
|
|
$(if $(filter $@, $(PHONY)),- due to target is PHONY, \
|
|
$(if $(wildcard $@), \
|
|
$(if $(strip $(any-prereq)),- due to: $(any-prereq), \
|
|
$(if $(arg-check), \
|
|
$(if $(cmd_$@),- due to command line change, \
|
|
$(if $(filter $@, $(targets)), \
|
|
- due to missing .cmd file, \
|
|
- due to $(notdir $@) not in $$(targets) \
|
|
) \
|
|
) \
|
|
) \
|
|
), \
|
|
- due to target missing \
|
|
) \
|
|
)
|
|
|
|
echo-why = $(call escsq, $(strip $(why)))
|
|
endif
|