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faabed295c
To build host programs, you need to add the program names to 'hostprogs' to use the necessary build rule, but it is not enough to build them because there is no dependency. There are two types of host programs: built as the prerequisite of another (e.g. gen_crc32table in lib/Makefile), or always built when Kbuild visits the Makefile (e.g. genksyms in scripts/genksyms/Makefile). The latter is typical in Makefiles under scripts/, which contains host programs globally used during the kernel build. To build them, you need to add them to both 'hostprogs' and 'always-y'. This commit adds hostprogs-always-y as a shorthand. The same applies to user programs. net/bpfilter/Makefile builds bpfilter_umh on demand, hence always-y is unneeded. In contrast, programs under samples/ are added to both 'userprogs' and 'always-y' so they are always built when Kbuild visits the Makefiles. userprogs-always-y works as a shorthand. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
457 lines
16 KiB
Makefile
457 lines
16 KiB
Makefile
# 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 += $(EXTRA_LDFLAGS)
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ifneq ($(always),)
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$(warning 'always' is deprecated. Please use 'always-y' instead)
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always-y += $(always)
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endif
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ifneq ($(hostprogs-y),)
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$(warning 'hostprogs-y' is deprecated. Please use 'hostprogs' instead)
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hostprogs += $(hostprogs-y)
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endif
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ifneq ($(hostprogs-m),)
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$(warning 'hostprogs-m' is deprecated. Please use 'hostprogs' instead)
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hostprogs += $(hostprogs-m)
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endif
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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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# Subdirectories we need to descend into
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subdir-ym := $(sort $(subdir-y) $(subdir-m) \
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$(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m))))
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# Handle objects in subdirs:
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# - If we encounter foo/ in $(obj-y), replace it by foo/built-in.a and
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# foo/modules.order
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# - If we encounter foo/ in $(obj-m), replace it by foo/modules.order
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#
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# Generate modules.order to determine modorder. Unfortunately, we don't have
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# information about ordering between -y and -m subdirs. Just put -y's first.
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ifdef need-modorder
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obj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m))
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else
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obj-m := $(filter-out %/, $(obj-m))
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endif
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ifdef need-builtin
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obj-y := $(patsubst %/, %/built-in.a, $(obj-y))
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else
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obj-y := $(filter-out %/, $(obj-y))
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endif
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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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# 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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always-y += $(always-m)
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# hostprogs-always-y += foo
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# ... is a shorthand for
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# hostprogs += foo
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# always-y += foo
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hostprogs += $(hostprogs-always-y) $(hostprogs-always-m)
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always-y += $(hostprogs-always-y) $(hostprogs-always-m)
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# userprogs-always-y is likewise.
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userprogs += $(userprogs-always-y) $(userprogs-always-m)
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always-y += $(userprogs-always-y) $(userprogs-always-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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# Add subdir path
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extra-y := $(addprefix $(obj)/,$(extra-y))
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always-y := $(addprefix $(obj)/,$(always-y))
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targets := $(addprefix $(obj)/,$(targets))
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obj-m := $(addprefix $(obj)/,$(obj-m))
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lib-y := $(addprefix $(obj)/,$(lib-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, list them all.
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modname-multi = $(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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modname = $(subst $(space),:,$(__modname))
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modfile = $(addprefix $(obj)/,$(__modname))
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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 = $(call stringify,$(subst $(comma),_,$(subst -,_,$1)))
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basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
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modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname))
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modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile))
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_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \
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$(filter-out $(ccflags-remove-y), \
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$(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \
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$(CFLAGS_$(target-stem).o))
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_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \
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$(filter-out $(asflags-remove-y), \
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$(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \
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$(AFLAGS_$(target-stem).o))
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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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#
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# Enable KCSAN flags except some files or directories we don't want to check
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# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE)
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#
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ifeq ($(CONFIG_KCSAN),y)
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_c_flags += $(if $(patsubst n%,, \
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$(KCSAN_SANITIZE_$(basetarget).o)$(KCSAN_SANITIZE)y), \
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$(CFLAGS_KCSAN))
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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) $(modfile_flags))
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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) $(AFLAGS_KERNEL))
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c_flags = -Wp,-MMD,$(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) $(modname_flags)
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a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
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$(_a_flags) $(modkern_aflags)
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cpp_flags = -Wp,-MMD,$(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 := $(srctree)/scripts/dtc/include-prefixes
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dtc_cpp_flags = -Wp,-MMD,$(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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quiet_cmd_copy = COPY $@
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cmd_copy = cp $< $@
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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) cDPrsT $@ $(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) | $(KGZIP) -n -f -9 > $@
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# DTC
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# ---------------------------------------------------------------------------
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DTC ?= $(objtree)/scripts/dtc/dtc
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DTC_FLAGS += -Wno-interrupt_provider
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# Disable noisy checks by default
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ifeq ($(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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-Winterrupt_provider
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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 = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
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$(DTC) -O $(patsubst .%,%,$(suffix $@)) -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)
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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 may be overridden from Documentation/devicetree/bindings/Makefile
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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) $@
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define rule_dtc
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$(call cmd_and_fixdep,dtc)
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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,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) | $(KBZIP2) -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) | $(KLZOP) -9; $(size_append); } > $@
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quiet_cmd_lz4 = LZ4 $@
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cmd_lz4 = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \
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$(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
|
|
# 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 $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
|
|
$(size_append); } > $@
|
|
|
|
quiet_cmd_xzmisc = XZMISC $@
|
|
cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@
|
|
|
|
# ASM offsets
|
|
# ---------------------------------------------------------------------------
|
|
|
|
# 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:; \
|
|
/^->/{s:->#\(.*\):/* \1 */:; \
|
|
s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
|
|
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
|