478 lines
18 KiB
Plaintext
478 lines
18 KiB
Plaintext
####
|
|
# kbuild: Generic definitions
|
|
|
|
# Convenient variables
|
|
comma := ,
|
|
quote := "
|
|
squote := '
|
|
empty :=
|
|
space := $(empty) $(empty)
|
|
space_escape := _-_SPACE_-_
|
|
right_paren := )
|
|
left_paren := (
|
|
|
|
###
|
|
# 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 $@))
|
|
|
|
###
|
|
# filename of first prerequisite with directory and extension stripped
|
|
baseprereq = $(basename $(notdir $<))
|
|
|
|
###
|
|
# 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:
|
|
# 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; \
|
|
$(kecho) ' CHK $@'; \
|
|
mkdir -p $(dir $@); \
|
|
$(filechk_$(1)) < $< > $@.tmp; \
|
|
if [ -r $@ ] && cmp -s $@ $@.tmp; then \
|
|
rm -f $@.tmp; \
|
|
else \
|
|
$(kecho) ' UPD $@'; \
|
|
mv -f $@.tmp $@; \
|
|
fi
|
|
endef
|
|
|
|
######
|
|
# gcc support functions
|
|
# See documentation in Documentation/kbuild/makefiles.txt
|
|
|
|
# cc-cross-prefix
|
|
# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
|
|
# Return first prefix where a prefix$(CC) is found in PATH.
|
|
# If no $(CC) found in PATH with listed prefixes return nothing
|
|
cc-cross-prefix = \
|
|
$(word 1, $(foreach c,$(1), \
|
|
$(shell set -e; \
|
|
if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
|
|
echo $(c); \
|
|
fi)))
|
|
|
|
# Tools for caching Makefile variables that are "expensive" to compute.
|
|
#
|
|
# Here we want to help deal with variables that take a long time to compute
|
|
# by making it easy to store these variables in a cache.
|
|
#
|
|
# The canonical example here is testing for compiler flags. On a simple system
|
|
# each call to the compiler takes 10 ms, but on a system with a compiler that's
|
|
# called through various wrappers it can take upwards of 100 ms. If we have
|
|
# 100 calls to the compiler this can take 1 second (on a simple system) or 10
|
|
# seconds (on a complicated system).
|
|
#
|
|
# The "cache" will be in Makefile syntax and can be directly included.
|
|
# Any time we try to reference a variable that's not in the cache we'll
|
|
# calculate it and store it in the cache for next time.
|
|
|
|
# Include values from last time
|
|
make-cache := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/,$(if $(obj),$(obj)/)).cache.mk
|
|
$(make-cache): ;
|
|
-include $(make-cache)
|
|
|
|
cached-data := $(filter __cached_%, $(.VARIABLES))
|
|
|
|
# If cache exceeds 1000 lines, shrink it down to 500.
|
|
ifneq ($(word 1000,$(cached-data)),)
|
|
$(shell tail -n 500 $(make-cache) > $(make-cache).tmp; \
|
|
mv $(make-cache).tmp $(make-cache))
|
|
endif
|
|
|
|
create-cache-dir := $(if $(KBUILD_SRC),$(if $(cache-data),,1))
|
|
|
|
# Usage: $(call __sanitize-opt,Hello=Hola$(comma)Goodbye Adios)
|
|
#
|
|
# Convert all '$', ')', '(', '\', '=', ' ', ',', ':' to '_'
|
|
__sanitize-opt = $(subst $$,_,$(subst $(right_paren),_,$(subst $(left_paren),_,$(subst \,_,$(subst =,_,$(subst $(space),_,$(subst $(comma),_,$(subst :,_,$(1)))))))))
|
|
|
|
# Usage: $(call shell-cached,shell_command)
|
|
# Example: $(call shell-cached,md5sum /usr/bin/gcc)
|
|
#
|
|
# If we've already seen a call to this exact shell command (even in a
|
|
# previous invocation of make!) we'll return the value. If not, we'll
|
|
# compute it and store the result for future runs.
|
|
#
|
|
# This is a bit of voodoo, but basic explanation is that if the variable
|
|
# was undefined then we'll evaluate the shell command and store the result
|
|
# into the variable. We'll then store that value in the cache and finally
|
|
# output the value.
|
|
#
|
|
# NOTE: The $$(2) here isn't actually a parameter to __run-and-store. We
|
|
# happen to know that the caller will have their shell command in $(2) so the
|
|
# result of "call"ing this will produce a reference to that $(2). The reason
|
|
# for this strangeness is to avoid an extra level of eval (and escaping) of
|
|
# $(2).
|
|
define __run-and-store
|
|
ifeq ($(origin $(1)),undefined)
|
|
$$(eval $(1) := $$(shell $$(2)))
|
|
ifeq ($(create-cache-dir),1)
|
|
$$(shell mkdir -p $(dir $(make-cache)))
|
|
$$(eval create-cache-dir :=)
|
|
endif
|
|
$$(shell echo '$(1) := $$($(1))' >> $(make-cache))
|
|
endif
|
|
endef
|
|
__shell-cached = $(eval $(call __run-and-store,$(1)))$($(1))
|
|
shell-cached = $(call __shell-cached,__cached_$(call __sanitize-opt,$(1)),$(1))
|
|
|
|
# output directory for tests below
|
|
TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
|
|
|
|
# try-run
|
|
# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
|
|
# Exit code chooses option. "$$TMP" serves as a temporary file and is
|
|
# automatically cleaned up.
|
|
__try-run = set -e; \
|
|
TMP="$(TMPOUT).$$$$.tmp"; \
|
|
TMPO="$(TMPOUT).$$$$.o"; \
|
|
if ($(1)) >/dev/null 2>&1; \
|
|
then echo "$(2)"; \
|
|
else echo "$(3)"; \
|
|
fi; \
|
|
rm -f "$$TMP" "$$TMPO"
|
|
|
|
try-run = $(shell $(__try-run))
|
|
|
|
# try-run-cached
|
|
# This works like try-run, but the result is cached.
|
|
try-run-cached = $(call shell-cached,$(__try-run))
|
|
|
|
# as-option
|
|
# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
|
|
|
|
as-option = $(call try-run-cached,\
|
|
$(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
|
|
|
|
# as-instr
|
|
# Usage: cflags-y += $(call as-instr,instr,option1,option2)
|
|
|
|
as-instr = $(call try-run-cached,\
|
|
printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
|
|
|
|
# __cc-option
|
|
# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
|
|
__cc-option = $(call try-run-cached,\
|
|
$(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
|
|
|
|
# Do not attempt to build with gcc plugins during cc-option tests.
|
|
# (And this uses delayed resolution so the flags will be up to date.)
|
|
CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
|
|
|
|
# cc-option
|
|
# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
|
|
|
|
cc-option = $(call __cc-option, $(CC),\
|
|
$(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(1),$(2))
|
|
|
|
# hostcc-option
|
|
# Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
|
|
hostcc-option = $(call __cc-option, $(HOSTCC),\
|
|
$(HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2))
|
|
|
|
# cc-option-yn
|
|
# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
|
|
cc-option-yn = $(call try-run-cached,\
|
|
$(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
|
|
|
|
# cc-disable-warning
|
|
# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
|
|
cc-disable-warning = $(call try-run-cached,\
|
|
$(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
|
|
|
|
# cc-name
|
|
# Expands to either gcc or clang
|
|
cc-name = $(call shell-cached,$(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)
|
|
|
|
# cc-version
|
|
cc-version = $(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
|
|
|
|
# cc-fullversion
|
|
cc-fullversion = $(call shell-cached,$(CONFIG_SHELL) \
|
|
$(srctree)/scripts/gcc-version.sh -p $(CC))
|
|
|
|
# cc-ifversion
|
|
# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
|
|
cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4))
|
|
|
|
# cc-if-fullversion
|
|
# Usage: EXTRA_CFLAGS += $(call cc-if-fullversion, -lt, 040502, -O1)
|
|
cc-if-fullversion = $(shell [ $(cc-fullversion) $(1) $(2) ] && echo $(3) || echo $(4))
|
|
|
|
# cc-ldoption
|
|
# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
|
|
cc-ldoption = $(call try-run-cached,\
|
|
$(CC) $(1) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
|
|
|
|
# ld-option
|
|
# Usage: LDFLAGS += $(call ld-option, -X)
|
|
ld-option = $(call try-run-cached,\
|
|
$(CC) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -x c /dev/null -c -o "$$TMPO"; \
|
|
$(LD) $(LDFLAGS) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
|
|
|
|
# ar-option
|
|
# Usage: KBUILD_ARFLAGS := $(call ar-option,D)
|
|
# Important: no spaces around options
|
|
ar-option = $(call try-run-cached, $(AR) rc$(1) "$$TMP",$(1),$(2))
|
|
|
|
# ld-version
|
|
# Note this is mainly for HJ Lu's 3 number binutil versions
|
|
ld-version = $(call shell-cached,$(LD) --version | $(srctree)/scripts/ld-version.sh)
|
|
|
|
# ld-ifversion
|
|
# Usage: $(call ld-ifversion, -ge, 22252, y)
|
|
ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
|
|
|
|
######
|
|
|
|
###
|
|
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
|
|
# Usage:
|
|
# $(Q)$(MAKE) $(build)=dir
|
|
build := -f $(srctree)/scripts/Makefile.build obj
|
|
|
|
###
|
|
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
|
|
# Usage:
|
|
# $(Q)$(MAKE) $(modbuiltin)=dir
|
|
modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
|
|
|
|
###
|
|
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
|
|
# Usage:
|
|
# $(Q)$(MAKE) $(dtbinst)=dir
|
|
dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj
|
|
|
|
###
|
|
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
|
|
# Usage:
|
|
# $(Q)$(MAKE) $(clean)=dir
|
|
clean := -f $(srctree)/scripts/Makefile.clean obj
|
|
|
|
###
|
|
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
|
|
# Usage:
|
|
# $(Q)$(MAKE) $(hdr-inst)=dir
|
|
hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
|
|
|
|
# Prefix -I with $(srctree) if it is not an absolute path.
|
|
# skip if -I has no parameter
|
|
addtree = $(if $(patsubst -I%,%,$(1)), \
|
|
$(if $(filter-out -I/% -I./% -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)))
|
|
|
|
# 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)))$(echo-why)';)
|
|
|
|
# printing commands
|
|
cmd = @$(echo-cmd) $(cmd_$(1))
|
|
|
|
# Add $(obj)/ for paths that are 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 are the same including their order. Result is empty
|
|
# string if equal. User may override this check using make KBUILD_NOCMDDEP=1
|
|
arg-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
|
|
$(subst $(space),$(space_escape),$(strip $(cmd_$1))))
|
|
else
|
|
arg-check = $(if $(strip $(cmd_$@)),,1)
|
|
endif
|
|
|
|
# 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 $$,$$$$,$(cmd_$(1)))))
|
|
|
|
# Find any prerequisites that is newer than target or that does not exist.
|
|
# PHONY targets skipped in both cases.
|
|
any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
|
|
|
|
# Execute command if command has changed or prerequisite(s) are updated.
|
|
if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
|
|
@set -e; \
|
|
$(echo-cmd) $(cmd_$(1)); \
|
|
printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
|
|
|
|
# Execute the command and also postprocess generated .d dependencies file.
|
|
if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
|
|
@set -e; \
|
|
$(cmd_and_fixdep), @:)
|
|
|
|
ifndef CONFIG_TRIM_UNUSED_KSYMS
|
|
|
|
cmd_and_fixdep = \
|
|
$(echo-cmd) $(cmd_$(1)); \
|
|
scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
|
|
rm -f $(depfile); \
|
|
mv -f $(dot-target).tmp $(dot-target).cmd;
|
|
|
|
else
|
|
|
|
# Filter out exported kernel symbol names from the preprocessor output.
|
|
# See also __KSYM_DEPS__ in include/linux/export.h.
|
|
# We disable the depfile generation here, so as not to overwrite the existing
|
|
# depfile while fixdep is parsing it.
|
|
flags_nodeps = $(filter-out -Wp$(comma)-M%, $($(1)))
|
|
ksym_dep_filter = \
|
|
case "$(1)" in \
|
|
cc_*_c|cpp_i_c) \
|
|
$(CPP) $(call flags_nodeps,c_flags) -D__KSYM_DEPS__ $< ;; \
|
|
as_*_S|cpp_s_S) \
|
|
$(CPP) $(call flags_nodeps,a_flags) -D__KSYM_DEPS__ $< ;; \
|
|
boot*|build*|cpp_its_S|*cpp_lds_S|dtc|host*|vdso*) : ;; \
|
|
*) echo "Don't know how to preprocess $(1)" >&2; false ;; \
|
|
esac | tr ";" "\n" | sed -rn 's/^.*=== __KSYM_(.*) ===.*$$/KSYM_\1/p'
|
|
|
|
cmd_and_fixdep = \
|
|
$(echo-cmd) $(cmd_$(1)); \
|
|
$(ksym_dep_filter) | \
|
|
scripts/basic/fixdep -e $(depfile) $@ '$(make-cmd)' \
|
|
> $(dot-target).tmp; \
|
|
rm -f $(depfile); \
|
|
mv -f $(dot-target).tmp $(dot-target).cmd;
|
|
|
|
endif
|
|
|
|
# Usage: $(call if_changed_rule,foo)
|
|
# Will check if $(cmd_foo) or any of the prerequisites 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 target got built
|
|
# 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 $$(targets) \
|
|
) \
|
|
) \
|
|
) \
|
|
), \
|
|
- due to target missing \
|
|
) \
|
|
)
|
|
|
|
echo-why = $(call escsq, $(strip $(why)))
|
|
endif
|
|
|
|
###############################################################################
|
|
#
|
|
# When a Kconfig string contains a filename, it is suitable for
|
|
# passing to shell commands. It is surrounded by double-quotes, and
|
|
# any double-quotes or backslashes within it are escaped by
|
|
# backslashes.
|
|
#
|
|
# This is no use for dependencies or $(wildcard). We need to strip the
|
|
# surrounding quotes and the escaping from quotes and backslashes, and
|
|
# we *do* need to escape any spaces in the string. So, for example:
|
|
#
|
|
# Usage: $(eval $(call config_filename,FOO))
|
|
#
|
|
# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
|
|
# transformed as described above to be suitable for use within the
|
|
# makefile.
|
|
#
|
|
# Also, if the filename is a relative filename and exists in the source
|
|
# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
|
|
# be prefixed to *both* command invocation and dependencies.
|
|
#
|
|
# Note: We also print the filenames in the quiet_cmd_foo text, and
|
|
# perhaps ought to have a version specially escaped for that purpose.
|
|
# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
|
|
# enough. It'll strip the quotes in the common case where there's no
|
|
# space and it's a simple filename, and it'll retain the quotes when
|
|
# there's a space. There are some esoteric cases in which it'll print
|
|
# the wrong thing, but we don't really care. The actual dependencies
|
|
# and commands *do* get it right, with various combinations of single
|
|
# and double quotes, backslashes and spaces in the filenames.
|
|
#
|
|
###############################################################################
|
|
#
|
|
define config_filename
|
|
ifneq ($$(CONFIG_$(1)),"")
|
|
$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
|
|
ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
|
|
else
|
|
ifeq ($$(wildcard $$($(1)_FILENAME)),)
|
|
ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
|
|
$(1)_SRCPREFIX := $(srctree)/
|
|
endif
|
|
endif
|
|
endif
|
|
endif
|
|
endef
|
|
#
|
|
###############################################################################
|