268 строки
9.9 KiB
Makefile
268 строки
9.9 KiB
Makefile
# ===========================================================================
|
|
# kbuild: Generic definitions
|
|
# ===========================================================================
|
|
|
|
# Standard vars
|
|
|
|
comma := ,
|
|
empty :=
|
|
space := $(empty) $(empty)
|
|
|
|
# Backward compatibility - to be removed...
|
|
extra-y += $(EXTRA_TARGETS)
|
|
# Figure out what we need to build from the various variables
|
|
# ===========================================================================
|
|
|
|
# When an object is listed to be built compiled-in and modular,
|
|
# only build the compiled-in version
|
|
|
|
obj-m := $(filter-out $(obj-y),$(obj-m))
|
|
|
|
# Libraries are always collected in one lib file.
|
|
# Filter out objects already built-in
|
|
|
|
lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
|
|
|
|
|
|
# Handle objects in subdirs
|
|
# ---------------------------------------------------------------------------
|
|
# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
|
|
# and add the directory to the list of dirs to descend into: $(subdir-y)
|
|
# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
|
|
# and add the directory to the list of dirs to descend into: $(subdir-m)
|
|
|
|
__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
|
|
subdir-y += $(__subdir-y)
|
|
__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
|
|
subdir-m += $(__subdir-m)
|
|
obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
|
|
obj-m := $(filter-out %/, $(obj-m))
|
|
|
|
# Subdirectories we need to descend into
|
|
|
|
subdir-ym := $(sort $(subdir-y) $(subdir-m))
|
|
|
|
# if $(foo-objs) exists, foo.o is a composite object
|
|
multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
|
|
multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
|
|
multi-used := $(multi-used-y) $(multi-used-m)
|
|
single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
|
|
|
|
# Build list of the parts of our composite objects, our composite
|
|
# objects depend on those (obviously)
|
|
multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
|
|
multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
|
|
multi-objs := $(multi-objs-y) $(multi-objs-m)
|
|
|
|
# $(subdir-obj-y) is the list of objects in $(obj-y) which do not live
|
|
# in the local directory
|
|
subdir-obj-y := $(foreach o,$(obj-y),$(if $(filter-out $(o),$(notdir $(o))),$(o)))
|
|
|
|
# $(obj-dirs) is a list of directories that contain object files
|
|
obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
|
|
|
|
# Replace multi-part objects by their individual parts, look at local dir only
|
|
real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y)
|
|
real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
|
|
|
|
# Add subdir path
|
|
|
|
extra-y := $(addprefix $(obj)/,$(extra-y))
|
|
always := $(addprefix $(obj)/,$(always))
|
|
targets := $(addprefix $(obj)/,$(targets))
|
|
obj-y := $(addprefix $(obj)/,$(obj-y))
|
|
obj-m := $(addprefix $(obj)/,$(obj-m))
|
|
lib-y := $(addprefix $(obj)/,$(lib-y))
|
|
subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
|
|
real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
|
|
real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
|
|
single-used-m := $(addprefix $(obj)/,$(single-used-m))
|
|
multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
|
|
multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
|
|
multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
|
|
multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
|
|
subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
|
|
obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
|
|
|
|
# The temporary file to save gcc -MD generated dependencies must not
|
|
# contain a comma
|
|
depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
|
|
|
|
# These flags are needed for modversions and compiling, so we define them here
|
|
# already
|
|
# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
|
|
# end up in (or would, if it gets compiled in)
|
|
# Note: It's possible that one object gets potentially linked into more
|
|
# than one module. In that case KBUILD_MODNAME will be set to foo_bar,
|
|
# where foo and bar are the name of the modules.
|
|
basename_flags = -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F)))
|
|
modname_flags = $(if $(filter 1,$(words $(modname))),-DKBUILD_MODNAME=$(subst $(comma),_,$(subst -,_,$(modname))))
|
|
|
|
_c_flags = $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$(*F).o)
|
|
_a_flags = $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
|
|
_cpp_flags = $(CPPFLAGS) $(EXTRA_CPPFLAGS) $(CPPFLAGS_$(@F))
|
|
|
|
# If building the kernel in a separate objtree expand all occurrences
|
|
# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
|
|
|
|
ifeq ($(KBUILD_SRC),)
|
|
__c_flags = $(_c_flags)
|
|
__a_flags = $(_a_flags)
|
|
__cpp_flags = $(_cpp_flags)
|
|
else
|
|
|
|
# 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)),$(o)))
|
|
|
|
# -I$(obj) locates generated .h files
|
|
# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
|
|
# and locates generated .h files
|
|
# FIXME: Replace both with specific CFLAGS* statements in the makefiles
|
|
__c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
|
|
__a_flags = $(call flags,_a_flags)
|
|
__cpp_flags = $(call flags,_cpp_flags)
|
|
endif
|
|
|
|
c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \
|
|
$(__c_flags) $(modkern_cflags) \
|
|
$(basename_flags) $(modname_flags)
|
|
|
|
a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \
|
|
$(__a_flags) $(modkern_aflags)
|
|
|
|
cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(__cpp_flags)
|
|
|
|
ld_flags = $(LDFLAGS) $(EXTRA_LDFLAGS)
|
|
|
|
# Finds the multi-part object the current object will be linked into
|
|
modname-multi = $(sort $(foreach m,$(multi-used),\
|
|
$(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
|
|
|
|
# Shipped files
|
|
# ===========================================================================
|
|
|
|
quiet_cmd_shipped = SHIPPED $@
|
|
cmd_shipped = cat $< > $@
|
|
|
|
$(obj)/%:: $(src)/%_shipped
|
|
$(call cmd,shipped)
|
|
|
|
# Commands useful for building a boot image
|
|
# ===========================================================================
|
|
#
|
|
# Use as following:
|
|
#
|
|
# target: source(s) FORCE
|
|
# $(if_changed,ld/objcopy/gzip)
|
|
#
|
|
# and add target to EXTRA_TARGETS so that we know we have to
|
|
# read in the saved command line
|
|
|
|
# Linking
|
|
# ---------------------------------------------------------------------------
|
|
|
|
quiet_cmd_ld = LD $@
|
|
cmd_ld = $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) $(LDFLAGS_$(@F)) \
|
|
$(filter-out FORCE,$^) -o $@
|
|
|
|
# Objcopy
|
|
# ---------------------------------------------------------------------------
|
|
|
|
quiet_cmd_objcopy = OBJCOPY $@
|
|
cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
|
|
|
|
# Gzip
|
|
# ---------------------------------------------------------------------------
|
|
|
|
quiet_cmd_gzip = GZIP $@
|
|
cmd_gzip = gzip -f -9 < $< > $@
|
|
|
|
# ===========================================================================
|
|
# Generic stuff
|
|
# ===========================================================================
|
|
|
|
ifneq ($(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)))
|
|
|
|
# If quiet is set, only print short version of command
|
|
|
|
cmd = @$(if $($(quiet)cmd_$(1)),echo ' $(subst ','\'',$($(quiet)cmd_$(1)))' &&) $(cmd_$(1))
|
|
|
|
# $(call descend,<dir>,<target>)
|
|
# Recursively call a sub-make in <dir> with target <target>
|
|
# Usage is deprecated, because make do not see this as an invocation of make.
|
|
descend =$(Q)$(MAKE) -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj=$(1) $(2)
|
|
|
|
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
|
|
# Usage:
|
|
# $(Q)$(MAKE) $(build)=dir
|
|
build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
|
|
|
|
# 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
|
|
|
|
define filechk
|
|
$(Q)set -e; \
|
|
echo ' CHK $@'; \
|
|
mkdir -p $(dir $@); \
|
|
$(filechk_$(1)) $(2) > $@.tmp; \
|
|
if [ -r $@ ] && cmp -s $@ $@.tmp; then \
|
|
rm -f $@.tmp; \
|
|
else \
|
|
echo ' UPD $@'; \
|
|
mv -f $@.tmp $@; \
|
|
fi
|
|
endef
|
|
|