mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 00:48:50 +00:00
e27128db62
KBUILD_ENABLE_EXTRA_GCC_CHECKS started as a switch to add extra warning options for GCC, but now it is a historical misnomer since we use it also for Clang, DTC, and even kernel-doc. Rename it to more sensible, shorter KBUILD_EXTRA_WARN. For the backward compatibility, KBUILD_ENABLE_EXTRA_GCC_CHECKS is still supported (but not advertised in the documentation). I also fixed up 'make help', and updated the documentation. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Nathan Chancellor <natechancellor@gmail.com> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Sedat Dilek <sedat.dilek@gmail.com>
428 lines
15 KiB
Text
428 lines
15 KiB
Text
# SPDX-License-Identifier: GPL-2.0
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# Backward compatibility
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asflags-y += $(EXTRA_AFLAGS)
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ccflags-y += $(EXTRA_CFLAGS)
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cppflags-y += $(EXTRA_CPPFLAGS)
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ldflags-y += $(EXTRA_LDFLAGS)
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# flags that take effect in current and sub directories
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KBUILD_AFLAGS += $(subdir-asflags-y)
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KBUILD_CFLAGS += $(subdir-ccflags-y)
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# Figure out what we need to build from the various variables
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# ===========================================================================
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# When an object is listed to be built compiled-in and modular,
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# only build the compiled-in version
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obj-m := $(filter-out $(obj-y),$(obj-m))
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# Libraries are always collected in one lib file.
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# Filter out objects already built-in
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lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
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# Determine modorder.
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# Unfortunately, we don't have information about ordering between -y
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# and -m subdirs. Just put -y's first.
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modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
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# Handle objects in subdirs
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# ---------------------------------------------------------------------------
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# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.a
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# and add the directory to the list of dirs to descend into: $(subdir-y)
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# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
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# and add the directory to the list of dirs to descend into: $(subdir-m)
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__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
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subdir-y += $(__subdir-y)
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__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
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subdir-m += $(__subdir-m)
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obj-y := $(patsubst %/, %/built-in.a, $(obj-y))
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obj-m := $(filter-out %/, $(obj-m))
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# Subdirectories we need to descend into
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subdir-ym := $(sort $(subdir-y) $(subdir-m))
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# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
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multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))), $(m))))
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multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))), $(m))))
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multi-used := $(multi-used-y) $(multi-used-m)
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# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
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# tell kbuild to descend
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subdir-obj-y := $(filter %/built-in.a, $(obj-y))
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# Replace multi-part objects by their individual parts,
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# including built-in.a from subdirectories
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real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
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real-obj-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m)))
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# DTB
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# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
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extra-y += $(dtb-y)
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extra-$(CONFIG_OF_ALL_DTBS) += $(dtb-)
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ifneq ($(CHECK_DTBS),)
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extra-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y))
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extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-))
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endif
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# Test self-contained headers
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# Wildcard searches in $(srctree)/$(src)/, but not in $(objtree)/$(obj)/.
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# Stale generated headers are often left over, so pattern matching should
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# be avoided. Please notice $(srctree)/$(src)/ and $(objtree)/$(obj) point
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# to the same location for in-tree building. So, header-test-pattern-y should
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# be used with care.
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header-test-y += $(filter-out $(header-test-), \
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$(patsubst $(srctree)/$(src)/%, %, \
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$(wildcard $(addprefix $(srctree)/$(src)/, \
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$(header-test-pattern-y)))))
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extra-$(CONFIG_HEADER_TEST) += $(addsuffix .s, $(header-test-y) $(header-test-m))
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# Add subdir path
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extra-y := $(addprefix $(obj)/,$(extra-y))
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always := $(addprefix $(obj)/,$(always))
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targets := $(addprefix $(obj)/,$(targets))
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modorder := $(addprefix $(obj)/,$(modorder))
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obj-m := $(addprefix $(obj)/,$(obj-m))
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lib-y := $(addprefix $(obj)/,$(lib-y))
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subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
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real-obj-y := $(addprefix $(obj)/,$(real-obj-y))
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real-obj-m := $(addprefix $(obj)/,$(real-obj-m))
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multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
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subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
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# Finds the multi-part object the current object will be linked into.
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# If the object belongs to two or more multi-part objects, all of them are
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# concatenated with a colon separator.
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modname-multi = $(subst $(space),:,$(sort $(foreach m,$(multi-used),\
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$(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=)))))
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modname = $(if $(modname-multi),$(modname-multi),$(basetarget))
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# target with $(obj)/ and its suffix stripped
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target-stem = $(basename $(patsubst $(obj)/%,%,$@))
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# These flags are needed for modversions and compiling, so we define them here
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# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
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# end up in (or would, if it gets compiled in)
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name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
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basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
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modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname))
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orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \
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$(ccflags-y) $(CFLAGS_$(target-stem).o)
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_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), $(orig_c_flags))
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orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \
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$(asflags-y) $(AFLAGS_$(target-stem).o)
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_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), $(orig_a_flags))
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_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
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#
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# Enable gcov profiling flags for a file, directory or for all files depending
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# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
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# (in this order)
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#
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ifeq ($(CONFIG_GCOV_KERNEL),y)
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_c_flags += $(if $(patsubst n%,, \
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$(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
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$(CFLAGS_GCOV))
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endif
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#
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# Enable address sanitizer flags for kernel except some files or directories
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# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
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#
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ifeq ($(CONFIG_KASAN),y)
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_c_flags += $(if $(patsubst n%,, \
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$(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
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$(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
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endif
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ifeq ($(CONFIG_UBSAN),y)
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_c_flags += $(if $(patsubst n%,, \
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$(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
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$(CFLAGS_UBSAN))
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endif
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ifeq ($(CONFIG_KCOV),y)
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_c_flags += $(if $(patsubst n%,, \
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$(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
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$(CFLAGS_KCOV))
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endif
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# $(srctree)/$(src) for including checkin headers from generated source files
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# $(objtree)/$(obj) for including generated headers from checkin source files
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ifeq ($(KBUILD_EXTMOD),)
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ifdef building_out_of_srctree
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_c_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
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_a_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
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_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
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endif
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endif
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part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
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quiet_modtag = $(if $(part-of-module),[M], )
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modkern_cflags = \
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$(if $(part-of-module), \
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$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
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$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
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modkern_aflags = $(if $(part-of-module), \
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$(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \
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$(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
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c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
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-include $(srctree)/include/linux/compiler_types.h \
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$(_c_flags) $(modkern_cflags) \
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$(basename_flags) $(modname_flags)
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a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
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$(_a_flags) $(modkern_aflags)
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cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
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$(_cpp_flags)
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ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
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DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes
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dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \
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$(addprefix -I,$(DTC_INCLUDE)) \
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-undef -D__DTS__
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# Useful for describing the dependency of composite objects
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# Usage:
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# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
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define multi_depend
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$(foreach m, $(notdir $1), \
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$(eval $(obj)/$m: \
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$(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
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endef
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# Shipped files
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# ===========================================================================
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quiet_cmd_shipped = SHIPPED $@
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cmd_shipped = cat $< > $@
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$(obj)/%: $(src)/%_shipped
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$(call cmd,shipped)
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# Commands useful for building a boot image
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# ===========================================================================
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#
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# Use as following:
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#
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# target: source(s) FORCE
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# $(if_changed,ld/objcopy/gzip)
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#
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# and add target to extra-y so that we know we have to
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# read in the saved command line
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# Linking
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# ---------------------------------------------------------------------------
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quiet_cmd_ld = LD $@
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cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
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# Archive
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# ---------------------------------------------------------------------------
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quiet_cmd_ar = AR $@
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cmd_ar = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(real-prereqs)
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# Objcopy
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# ---------------------------------------------------------------------------
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quiet_cmd_objcopy = OBJCOPY $@
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cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
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# Gzip
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# ---------------------------------------------------------------------------
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quiet_cmd_gzip = GZIP $@
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cmd_gzip = cat $(real-prereqs) | gzip -n -f -9 > $@
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# DTC
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# ---------------------------------------------------------------------------
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DTC ?= $(objtree)/scripts/dtc/dtc
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# Disable noisy checks by default
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ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
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DTC_FLAGS += -Wno-unit_address_vs_reg \
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-Wno-unit_address_format \
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-Wno-avoid_unnecessary_addr_size \
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-Wno-alias_paths \
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-Wno-graph_child_address \
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-Wno-simple_bus_reg \
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-Wno-unique_unit_address \
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-Wno-pci_device_reg
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endif
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ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
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DTC_FLAGS += -Wnode_name_chars_strict \
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-Wproperty_name_chars_strict
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endif
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DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
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# Generate an assembly file to wrap the output of the device tree compiler
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quiet_cmd_dt_S_dtb= DTB $@
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cmd_dt_S_dtb= \
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{ \
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echo '\#include <asm-generic/vmlinux.lds.h>'; \
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echo '.section .dtb.init.rodata,"a"'; \
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echo '.balign STRUCT_ALIGNMENT'; \
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echo '.global __dtb_$(subst -,_,$(*F))_begin'; \
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echo '__dtb_$(subst -,_,$(*F))_begin:'; \
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echo '.incbin "$<" '; \
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echo '__dtb_$(subst -,_,$(*F))_end:'; \
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echo '.global __dtb_$(subst -,_,$(*F))_end'; \
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echo '.balign STRUCT_ALIGNMENT'; \
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} > $@
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$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
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$(call if_changed,dt_S_dtb)
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quiet_cmd_dtc = DTC $@
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cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
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$(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
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$(DTC) -O $(2) -o $@ -b 0 \
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$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
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-d $(depfile).dtc.tmp $(dtc-tmp) ; \
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cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
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$(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
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$(call if_changed_dep,dtc,dtb)
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DT_CHECKER ?= dt-validate
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DT_BINDING_DIR := Documentation/devicetree/bindings
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DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml
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quiet_cmd_dtb_check = CHECK $@
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cmd_dtb_check = $(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ ;
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define rule_dtc_dt_yaml
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$(call cmd_and_fixdep,dtc,yaml)
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$(call cmd,dtb_check)
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endef
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$(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
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$(call if_changed_rule,dtc_dt_yaml)
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dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
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# Bzip2
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# ---------------------------------------------------------------------------
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# Bzip2 and LZMA do not include size in file... so we have to fake that;
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# append the size as a 32-bit littleendian number as gzip does.
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size_append = printf $(shell \
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dec_size=0; \
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for F in $(real-prereqs); do \
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fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \
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dec_size=$$(expr $$dec_size + $$fsize); \
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done; \
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printf "%08x\n" $$dec_size | \
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sed 's/\(..\)/\1 /g' | { \
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read ch0 ch1 ch2 ch3; \
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for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
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printf '%s%03o' '\\' $$((0x$$ch)); \
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done; \
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} \
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)
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quiet_cmd_bzip2 = BZIP2 $@
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cmd_bzip2 = { cat $(real-prereqs) | bzip2 -9; $(size_append); } > $@
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# Lzma
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# ---------------------------------------------------------------------------
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quiet_cmd_lzma = LZMA $@
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cmd_lzma = { cat $(real-prereqs) | lzma -9; $(size_append); } > $@
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quiet_cmd_lzo = LZO $@
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cmd_lzo = { cat $(real-prereqs) | lzop -9; $(size_append); } > $@
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quiet_cmd_lz4 = LZ4 $@
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cmd_lz4 = { cat $(real-prereqs) | lz4c -l -c1 stdin stdout; \
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$(size_append); } > $@
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# U-Boot mkimage
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# ---------------------------------------------------------------------------
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MKIMAGE := $(srctree)/scripts/mkuboot.sh
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# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
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# the number of overrides in arch makefiles
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UIMAGE_ARCH ?= $(SRCARCH)
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UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
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UIMAGE_OPTS-y ?=
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UIMAGE_TYPE ?= kernel
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UIMAGE_LOADADDR ?= arch_must_set_this
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UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
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UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
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quiet_cmd_uimage = UIMAGE $@
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cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
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-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
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-T $(UIMAGE_TYPE) \
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-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
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-n $(UIMAGE_NAME) -d $< $@
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# XZ
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# ---------------------------------------------------------------------------
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# Use xzkern to compress the kernel image and xzmisc to compress other things.
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#
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# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
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# of the kernel decompressor. A BCJ filter is used if it is available for
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# the target architecture. xzkern also appends uncompressed size of the data
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# using size_append. The .xz format has the size information available at
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# the end of the file too, but it's in more complex format and it's good to
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# avoid changing the part of the boot code that reads the uncompressed size.
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# Note that the bytes added by size_append will make the xz tool think that
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# the file is corrupt. This is expected.
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#
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# xzmisc doesn't use size_append, so it can be used to create normal .xz
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# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
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# big dictionary would increase the memory usage too much in the multi-call
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# decompression mode. A BCJ filter isn't used either.
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quiet_cmd_xzkern = XZKERN $@
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cmd_xzkern = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
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$(size_append); } > $@
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quiet_cmd_xzmisc = XZMISC $@
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cmd_xzmisc = cat $(real-prereqs) | xz --check=crc32 --lzma2=dict=1MiB > $@
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# ASM offsets
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# ---------------------------------------------------------------------------
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# Default sed regexp - multiline due to syntax constraints
|
|
#
|
|
# Use [:space:] because LLVM's integrated assembler inserts <tab> around
|
|
# the .ascii directive whereas GCC keeps the <space> as-is.
|
|
define sed-offsets
|
|
's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
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|
/^->/{s:->#\(.*\):/* \1 */:; \
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|
s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
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|
s:->::; p;}'
|
|
endef
|
|
|
|
# Use filechk to avoid rebuilds when a header changes, but the resulting file
|
|
# does not
|
|
define filechk_offsets
|
|
echo "#ifndef $2"; \
|
|
echo "#define $2"; \
|
|
echo "/*"; \
|
|
echo " * DO NOT MODIFY."; \
|
|
echo " *"; \
|
|
echo " * This file was generated by Kbuild"; \
|
|
echo " */"; \
|
|
echo ""; \
|
|
sed -ne $(sed-offsets) < $<; \
|
|
echo ""; \
|
|
echo "#endif"
|
|
endef
|