| # Backward compatibility |
| asflags-y += $(EXTRA_AFLAGS) |
| ccflags-y += $(EXTRA_CFLAGS) |
| cppflags-y += $(EXTRA_CPPFLAGS) |
| ldflags-y += $(EXTRA_LDFLAGS) |
| |
| # |
| # flags that take effect in sub directories |
| export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y) |
| export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y) |
| |
| # 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) |
| |
| # Determine modorder. |
| # Unfortunately, we don't have information about ordering between -y |
| # and -m subdirs. Just put -y's first. |
| modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko)) |
| |
| __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 uses dir/ to |
| # tell kbuild to descend |
| subdir-obj-y := $(filter %/built-in.o, $(obj-y)) |
| |
| # $(obj-dirs) is a list of directories that contain object files |
| obj-dirs := $(dir $(multi-objs) $(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)) |
| modorder := $(addprefix $(obj)/,$(modorder)) |
| 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)) |
| |
| # 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: Files that end up in two or more modules are compiled without the |
| # KBUILD_MODNAME definition. The reason is that any made-up name would |
| # differ in different configs. |
| name-fix = $(subst $(comma),_,$(subst -,_,$1)) |
| basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))" |
| modname_flags = $(if $(filter 1,$(words $(modname))),\ |
| -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))") |
| |
| orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \ |
| $(ccflags-y) $(CFLAGS_$(basetarget).o) |
| _c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags)) |
| _a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \ |
| $(asflags-y) $(AFLAGS_$(basetarget).o) |
| _cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F)) |
| |
| # |
| # Enable gcov profiling flags for a file, directory or for all files depending |
| # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL |
| # (in this order) |
| # |
| ifeq ($(CONFIG_GCOV_KERNEL),y) |
| _c_flags += $(if $(patsubst n%,, \ |
| $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \ |
| $(CFLAGS_GCOV)) |
| endif |
| |
| # |
| # Enable address sanitizer flags for kernel except some files or directories |
| # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE) |
| # |
| ifeq ($(CONFIG_KASAN),y) |
| _c_flags += $(if $(patsubst n%,, \ |
| $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \ |
| $(CFLAGS_KASAN)) |
| endif |
| |
| # If building the kernel in a separate objtree expand all occurrences |
| # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/'). |
| |
| ifeq ($(KBUILD_SRC),) |
| __c_flags = $(_c_flags) |
| __a_flags = $(_a_flags) |
| __cpp_flags = $(_cpp_flags) |
| else |
| |
| # -I$(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) $(LINUXINCLUDE) \ |
| $(__c_flags) $(modkern_cflags) \ |
| -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) |
| |
| a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ |
| $(__a_flags) $(modkern_aflags) |
| |
| cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ |
| $(__cpp_flags) |
| |
| ld_flags = $(LDFLAGS) $(ldflags-y) |
| |
| dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \ |
| -I$(srctree)/arch/$(SRCARCH)/boot/dts \ |
| -I$(srctree)/arch/$(SRCARCH)/boot/dts/include \ |
| -I$(srctree)/drivers/of/testcase-data \ |
| -undef -D__DTS__ |
| |
| # 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=)))) |
| |
| # Useful for describing the dependency of composite objects |
| # Usage: |
| # $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) |
| define multi_depend |
| $(foreach m, $(notdir $1), \ |
| $(eval $(obj)/$m: \ |
| $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s))))))) |
| endef |
| |
| ifdef REGENERATE_PARSERS |
| |
| # GPERF |
| # --------------------------------------------------------------------------- |
| quiet_cmd_gperf = GPERF $@ |
| cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $< |
| |
| .PRECIOUS: $(src)/%.hash.c_shipped |
| $(src)/%.hash.c_shipped: $(src)/%.gperf |
| $(call cmd,gperf) |
| |
| # LEX |
| # --------------------------------------------------------------------------- |
| LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy) |
| |
| quiet_cmd_flex = LEX $@ |
| cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $< |
| |
| .PRECIOUS: $(src)/%.lex.c_shipped |
| $(src)/%.lex.c_shipped: $(src)/%.l |
| $(call cmd,flex) |
| |
| # YACC |
| # --------------------------------------------------------------------------- |
| YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy) |
| |
| quiet_cmd_bison = YACC $@ |
| cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $< |
| |
| .PRECIOUS: $(src)/%.tab.c_shipped |
| $(src)/%.tab.c_shipped: $(src)/%.y |
| $(call cmd,bison) |
| |
| quiet_cmd_bison_h = YACC $@ |
| cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $< |
| |
| .PRECIOUS: $(src)/%.tab.h_shipped |
| $(src)/%.tab.h_shipped: $(src)/%.y |
| $(call cmd,bison_h) |
| |
| endif |
| |
| # 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-y so that we know we have to |
| # read in the saved command line |
| |
| # Linking |
| # --------------------------------------------------------------------------- |
| |
| quiet_cmd_ld = LD $@ |
| cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \ |
| $(filter-out FORCE,$^) -o $@ |
| |
| # Objcopy |
| # --------------------------------------------------------------------------- |
| |
| quiet_cmd_objcopy = OBJCOPY $@ |
| cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ |
| |
| # Gzip |
| # --------------------------------------------------------------------------- |
| |
| quiet_cmd_gzip = GZIP $@ |
| cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \ |
| (rm -f $@ ; false) |
| |
| # DTC |
| # --------------------------------------------------------------------------- |
| |
| # Generate an assembly file to wrap the output of the device tree compiler |
| quiet_cmd_dt_S_dtb= DTB $@ |
| cmd_dt_S_dtb= \ |
| ( \ |
| echo '\#include <asm-generic/vmlinux.lds.h>'; \ |
| echo '.section .dtb.init.rodata,"a"'; \ |
| echo '.balign STRUCT_ALIGNMENT'; \ |
| echo '.global __dtb_$(*F)_begin'; \ |
| echo '__dtb_$(*F)_begin:'; \ |
| echo '.incbin "$<" '; \ |
| echo '__dtb_$(*F)_end:'; \ |
| echo '.global __dtb_$(*F)_end'; \ |
| echo '.balign STRUCT_ALIGNMENT'; \ |
| ) > $@ |
| |
| $(obj)/%.dtb.S: $(obj)/%.dtb |
| $(call cmd,dt_S_dtb) |
| |
| quiet_cmd_dtc = DTC $@ |
| cmd_dtc = $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ |
| $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 \ |
| -i $(dir $<) $(DTC_FLAGS) \ |
| -d $(depfile).dtc.tmp $(dtc-tmp) ; \ |
| cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) |
| |
| $(obj)/%.dtb: $(src)/%.dts FORCE |
| $(call if_changed_dep,dtc) |
| |
| dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) |
| |
| # Bzip2 |
| # --------------------------------------------------------------------------- |
| |
| # Bzip2 and LZMA do not include size in file... so we have to fake that; |
| # append the size as a 32-bit littleendian number as gzip does. |
| size_append = printf $(shell \ |
| dec_size=0; \ |
| for F in $1; do \ |
| fsize=$$(stat -c "%s" $$F); \ |
| dec_size=$$(expr $$dec_size + $$fsize); \ |
| done; \ |
| printf "%08x\n" $$dec_size | \ |
| sed 's/\(..\)/\1 /g' | { \ |
| read ch0 ch1 ch2 ch3; \ |
| for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ |
| printf '%s%03o' '\\' $$((0x$$ch)); \ |
| done; \ |
| } \ |
| ) |
| |
| quiet_cmd_bzip2 = BZIP2 $@ |
| cmd_bzip2 = (cat $(filter-out FORCE,$^) | \ |
| bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ |
| (rm -f $@ ; false) |
| |
| # Lzma |
| # --------------------------------------------------------------------------- |
| |
| quiet_cmd_lzma = LZMA $@ |
| cmd_lzma = (cat $(filter-out FORCE,$^) | \ |
| lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ |
| (rm -f $@ ; false) |
| |
| quiet_cmd_lzo = LZO $@ |
| cmd_lzo = (cat $(filter-out FORCE,$^) | \ |
| lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ |
| (rm -f $@ ; false) |
| |
| quiet_cmd_lz4 = LZ4 $@ |
| cmd_lz4 = (cat $(filter-out FORCE,$^) | \ |
| lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ |
| (rm -f $@ ; false) |
| |
| # U-Boot mkimage |
| # --------------------------------------------------------------------------- |
| |
| MKIMAGE := $(srctree)/scripts/mkuboot.sh |
| |
| # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces |
| # the number of overrides in arch makefiles |
| UIMAGE_ARCH ?= $(SRCARCH) |
| UIMAGE_COMPRESSION ?= $(if $(2),$(2),none) |
| UIMAGE_OPTS-y ?= |
| UIMAGE_TYPE ?= kernel |
| UIMAGE_LOADADDR ?= arch_must_set_this |
| UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) |
| UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)' |
| UIMAGE_IN ?= $< |
| UIMAGE_OUT ?= $@ |
| |
| quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT) |
| cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ |
| -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ |
| -T $(UIMAGE_TYPE) \ |
| -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ |
| -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT) |
| |
| # XZ |
| # --------------------------------------------------------------------------- |
| # Use xzkern to compress the kernel image and xzmisc to compress other things. |
| # |
| # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage |
| # of the kernel decompressor. A BCJ filter is used if it is available for |
| # the target architecture. xzkern also appends uncompressed size of the data |
| # using size_append. The .xz format has the size information available at |
| # the end of the file too, but it's in more complex format and it's good to |
| # avoid changing the part of the boot code that reads the uncompressed size. |
| # Note that the bytes added by size_append will make the xz tool think that |
| # the file is corrupt. This is expected. |
| # |
| # xzmisc doesn't use size_append, so it can be used to create normal .xz |
| # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very |
| # big dictionary would increase the memory usage too much in the multi-call |
| # decompression mode. A BCJ filter isn't used either. |
| quiet_cmd_xzkern = XZKERN $@ |
| cmd_xzkern = (cat $(filter-out FORCE,$^) | \ |
| sh $(srctree)/scripts/xz_wrap.sh && \ |
| $(call size_append, $(filter-out FORCE,$^))) > $@ || \ |
| (rm -f $@ ; false) |
| |
| quiet_cmd_xzmisc = XZMISC $@ |
| cmd_xzmisc = (cat $(filter-out FORCE,$^) | \ |
| xz --check=crc32 --lzma2=dict=1MiB) > $@ || \ |
| (rm -f $@ ; false) |