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https://mirrors.bfsu.edu.cn/git/linux.git
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c07d8d47bc
Since commit ff9b45c55b ("kbuild: modpost: read modules.order instead
of $(MODVERDIR)/*.mod"), a module is no longer built in the following
pattern:
[Makefile]
subdir-y := some-module
[some-module/Makefile]
obj-m := some-module.o
You cannot write Makefile this way in upstream because modules.order is
not correctly generated. subdir-y is used to descend to a sub-directory
that builds tools, device trees, etc.
For external modules, the modules order does not matter. So, the
Makefile above was known to work.
I believe the Makefile should be re-written as follows:
[Makefile]
obj-m := some-module/
[some-module/Makefile]
obj-m := some-module.o
However, people will have no idea if their Makefile suddenly stops
working. In fact, I received questions from multiple people.
Show a warning for a while if obj-m is specified in a Makefile visited
by subdir-y or subdir-m.
I touched the %/ rule to avoid false-positive warnings for the single
target.
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Tom Stonecypher <thomas.edwardx.stonecypher@intel.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Tested-by: Jan Kiszka <jan.kiszka@siemens.com>
529 lines
17 KiB
Makefile
529 lines
17 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# ==========================================================================
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# Building
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# ==========================================================================
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src := $(obj)
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PHONY := __build
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__build:
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# Init all relevant variables used in kbuild files so
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# 1) they have correct type
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# 2) they do not inherit any value from the environment
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obj-y :=
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obj-m :=
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lib-y :=
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lib-m :=
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always :=
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targets :=
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subdir-y :=
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subdir-m :=
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EXTRA_AFLAGS :=
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EXTRA_CFLAGS :=
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EXTRA_CPPFLAGS :=
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EXTRA_LDFLAGS :=
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asflags-y :=
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ccflags-y :=
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cppflags-y :=
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ldflags-y :=
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subdir-asflags-y :=
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subdir-ccflags-y :=
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# Read auto.conf if it exists, otherwise ignore
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-include include/config/auto.conf
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include scripts/Kbuild.include
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# The filename Kbuild has precedence over Makefile
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kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
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kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
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include $(kbuild-file)
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include scripts/Makefile.lib
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# Do not include host rules unless needed
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ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
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include scripts/Makefile.host
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endif
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ifndef obj
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$(warning kbuild: Makefile.build is included improperly)
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endif
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ifeq ($(MAKECMDGOALS)$(need-modorder),)
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ifneq ($(obj-m),)
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$(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.)
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$(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.)
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endif
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endif
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# ===========================================================================
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ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
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lib-target := $(obj)/lib.a
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real-obj-y += $(obj)/lib-ksyms.o
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endif
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ifneq ($(strip $(real-obj-y) $(need-builtin)),)
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builtin-target := $(obj)/built-in.a
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endif
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ifeq ($(CONFIG_MODULES)$(need-modorder),y1)
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modorder-target := $(obj)/modules.order
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endif
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mod-targets := $(patsubst %.o, %.mod, $(obj-m))
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__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
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$(if $(KBUILD_MODULES),$(obj-m) $(mod-targets) $(modorder-target)) \
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$(subdir-ym) $(always)
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@:
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# Linus' kernel sanity checking tool
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ifeq ($(KBUILD_CHECKSRC),1)
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quiet_cmd_checksrc = CHECK $<
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cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
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else ifeq ($(KBUILD_CHECKSRC),2)
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quiet_cmd_force_checksrc = CHECK $<
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cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
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endif
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ifneq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
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cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $<
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endif
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# Compile C sources (.c)
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# ---------------------------------------------------------------------------
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# Default is built-in, unless we know otherwise
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$(foreach x, i ll lst o s symtypes, $(patsubst %.o,%.$(x),$(real-obj-m))): \
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part-of-module := y
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modkern_cflags = \
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$(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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quiet_modtag = $(if $(part-of-module),[M], )
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quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
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cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS), $(c_flags)) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
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$(obj)/%.s: $(src)/%.c FORCE
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$(call if_changed_dep,cc_s_c)
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quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
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cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
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$(obj)/%.i: $(src)/%.c FORCE
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$(call if_changed_dep,cpp_i_c)
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# These mirror gensymtypes_S and co below, keep them in synch.
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cmd_gensymtypes_c = \
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$(CPP) -D__GENKSYMS__ $(c_flags) $< | \
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scripts/genksyms/genksyms $(if $(1), -T $(2)) \
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$(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
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$(if $(KBUILD_PRESERVE),-p) \
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-r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
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quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
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cmd_cc_symtypes_c = \
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$(call cmd_gensymtypes_c,true,$@) >/dev/null; \
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test -s $@ || rm -f $@
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$(obj)/%.symtypes : $(src)/%.c FORCE
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$(call cmd,cc_symtypes_c)
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# LLVM assembly
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# Generate .ll files from .c
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quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
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cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
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$(obj)/%.ll: $(src)/%.c FORCE
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$(call if_changed_dep,cc_ll_c)
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# C (.c) files
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# The C file is compiled and updated dependency information is generated.
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# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
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quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
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cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
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ifdef CONFIG_MODVERSIONS
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# When module versioning is enabled the following steps are executed:
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# o compile a <file>.o from <file>.c
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# o if <file>.o doesn't contain a __ksymtab version, i.e. does
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# not export symbols, it's done.
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# o otherwise, we calculate symbol versions using the good old
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# genksyms on the preprocessed source and postprocess them in a way
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# that they are usable as a linker script
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# o generate .tmp_<file>.o from <file>.o using the linker to
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# replace the unresolved symbols __crc_exported_symbol with
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# the actual value of the checksum generated by genksyms
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# o remove .tmp_<file>.o to <file>.o
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cmd_modversions_c = \
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if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \
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$(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
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> $(@D)/.tmp_$(@F:.o=.ver); \
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\
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$(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \
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-T $(@D)/.tmp_$(@F:.o=.ver); \
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mv -f $(@D)/.tmp_$(@F) $@; \
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rm -f $(@D)/.tmp_$(@F:.o=.ver); \
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fi
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endif
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ifdef CONFIG_FTRACE_MCOUNT_RECORD
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ifndef CC_USING_RECORD_MCOUNT
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# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
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ifdef BUILD_C_RECORDMCOUNT
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ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
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RECORDMCOUNT_FLAGS = -w
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endif
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# Due to recursion, we must skip empty.o.
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# The empty.o file is created in the make process in order to determine
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# the target endianness and word size. It is made before all other C
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# files, including recordmcount.
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sub_cmd_record_mcount = \
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if [ $(@) != "scripts/mod/empty.o" ]; then \
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$(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
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fi;
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recordmcount_source := $(srctree)/scripts/recordmcount.c \
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$(srctree)/scripts/recordmcount.h
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else
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sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
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"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
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"$(if $(CONFIG_64BIT),64,32)" \
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"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \
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"$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \
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"$(if $(part-of-module),1,0)" "$(@)";
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recordmcount_source := $(srctree)/scripts/recordmcount.pl
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endif # BUILD_C_RECORDMCOUNT
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cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \
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$(sub_cmd_record_mcount))
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endif # CC_USING_RECORD_MCOUNT
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endif # CONFIG_FTRACE_MCOUNT_RECORD
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ifdef CONFIG_STACK_VALIDATION
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ifneq ($(SKIP_STACK_VALIDATION),1)
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__objtool_obj := $(objtree)/tools/objtool/objtool
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objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check)
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objtool_args += $(if $(part-of-module), --module,)
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ifndef CONFIG_FRAME_POINTER
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objtool_args += --no-fp
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endif
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ifdef CONFIG_GCOV_KERNEL
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objtool_args += --no-unreachable
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endif
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ifdef CONFIG_RETPOLINE
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objtool_args += --retpoline
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endif
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ifdef CONFIG_X86_SMAP
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objtool_args += --uaccess
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endif
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# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
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# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
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# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
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cmd_objtool = $(if $(patsubst y%,, \
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$(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
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$(__objtool_obj) $(objtool_args) $@)
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objtool_obj = $(if $(patsubst y%,, \
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$(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
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$(__objtool_obj))
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endif # SKIP_STACK_VALIDATION
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endif # CONFIG_STACK_VALIDATION
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# Rebuild all objects when objtool changes, or is enabled/disabled.
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objtool_dep = $(objtool_obj) \
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$(wildcard include/config/orc/unwinder.h \
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include/config/stack/validation.h)
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ifdef CONFIG_TRIM_UNUSED_KSYMS
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cmd_gen_ksymdeps = \
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$(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd
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endif
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define rule_cc_o_c
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$(call cmd,checksrc)
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$(call cmd_and_fixdep,cc_o_c)
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$(call cmd,gen_ksymdeps)
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$(call cmd,checkdoc)
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$(call cmd,objtool)
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$(call cmd,modversions_c)
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$(call cmd,record_mcount)
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endef
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define rule_as_o_S
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$(call cmd_and_fixdep,as_o_S)
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$(call cmd,gen_ksymdeps)
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$(call cmd,objtool)
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$(call cmd,modversions_S)
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endef
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# List module undefined symbols (or empty line if not enabled)
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ifdef CONFIG_TRIM_UNUSED_KSYMS
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cmd_undef_syms = $(NM) $< | sed -n 's/^ *U //p' | xargs echo
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else
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cmd_undef_syms = echo
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endif
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# Built-in and composite module parts
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$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
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$(call cmd,force_checksrc)
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$(call if_changed_rule,cc_o_c)
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cmd_mod = { \
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echo $(if $($*-objs)$($*-y)$($*-m), $(addprefix $(obj)/, $($*-objs) $($*-y) $($*-m)), $(@:.mod=.o)); \
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$(cmd_undef_syms); \
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} > $@
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$(obj)/%.mod: $(obj)/%.o FORCE
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$(call if_changed,mod)
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targets += $(mod-targets)
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quiet_cmd_cc_lst_c = MKLST $@
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cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
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$(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
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System.map $(OBJDUMP) > $@
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$(obj)/%.lst: $(src)/%.c FORCE
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$(call if_changed_dep,cc_lst_c)
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# header test (header-test-y, header-test-m target)
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# ---------------------------------------------------------------------------
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quiet_cmd_cc_s_h = CC $@
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cmd_cc_s_h = $(CC) $(c_flags) -S -o $@ -x c /dev/null -include $<
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$(obj)/%.h.s: $(src)/%.h FORCE
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$(call if_changed_dep,cc_s_h)
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# Compile assembler sources (.S)
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# ---------------------------------------------------------------------------
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modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
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$(real-obj-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
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$(real-obj-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
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# .S file exports must have their C prototypes defined in asm/asm-prototypes.h
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# or a file that it includes, in order to get versioned symbols. We build a
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# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
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# the .S file (with trailing ';'), and run genksyms on that, to extract vers.
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#
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# This is convoluted. The .S file must first be preprocessed to run guards and
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# expand names, then the resulting exports must be constructed into plain
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# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
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# to make the genksyms input.
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#
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# These mirror gensymtypes_c and co above, keep them in synch.
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cmd_gensymtypes_S = \
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{ echo "\#include <linux/kernel.h>" ; \
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echo "\#include <asm/asm-prototypes.h>" ; \
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$(CPP) $(a_flags) $< | \
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grep "\<___EXPORT_SYMBOL\>" | \
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sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ; } | \
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$(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \
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scripts/genksyms/genksyms $(if $(1), -T $(2)) \
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$(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
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$(if $(KBUILD_PRESERVE),-p) \
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-r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
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quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
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cmd_cc_symtypes_S = \
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$(call cmd_gensymtypes_S,true,$@) >/dev/null; \
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test -s $@ || rm -f $@
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$(obj)/%.symtypes : $(src)/%.S FORCE
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$(call cmd,cc_symtypes_S)
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quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
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cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
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$(obj)/%.s: $(src)/%.S FORCE
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$(call if_changed_dep,cpp_s_S)
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quiet_cmd_as_o_S = AS $(quiet_modtag) $@
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cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
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ifdef CONFIG_MODVERSIONS
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ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
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ifneq ($(ASM_PROTOTYPES),)
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# versioning matches the C process described above, with difference that
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# we parse asm-prototypes.h C header to get function definitions.
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cmd_modversions_S = \
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if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \
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$(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
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> $(@D)/.tmp_$(@F:.o=.ver); \
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\
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$(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \
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-T $(@D)/.tmp_$(@F:.o=.ver); \
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mv -f $(@D)/.tmp_$(@F) $@; \
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rm -f $(@D)/.tmp_$(@F:.o=.ver); \
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fi
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endif
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endif
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$(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE
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$(call if_changed_rule,as_o_S)
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targets += $(filter-out $(subdir-obj-y), $(real-obj-y)) $(real-obj-m) $(lib-y)
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targets += $(extra-y) $(MAKECMDGOALS) $(always)
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# Linker scripts preprocessor (.lds.S -> .lds)
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# ---------------------------------------------------------------------------
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quiet_cmd_cpp_lds_S = LDS $@
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cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \
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-D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
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$(obj)/%.lds: $(src)/%.lds.S FORCE
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$(call if_changed_dep,cpp_lds_S)
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# ASN.1 grammar
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# ---------------------------------------------------------------------------
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quiet_cmd_asn1_compiler = ASN.1 $@
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cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
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$(subst .h,.c,$@) $(subst .c,.h,$@)
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$(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
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$(call cmd,asn1_compiler)
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# Build the compiled-in targets
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# ---------------------------------------------------------------------------
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# To build objects in subdirs, we need to descend into the directories
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$(sort $(subdir-obj-y)): $(subdir-ym) ;
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#
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# Rule to compile a set of .o files into one .a file (without symbol table)
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#
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ifdef builtin-target
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quiet_cmd_ar_builtin = AR $@
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cmd_ar_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(real-prereqs)
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$(builtin-target): $(real-obj-y) FORCE
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$(call if_changed,ar_builtin)
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targets += $(builtin-target)
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endif # builtin-target
|
|
|
|
#
|
|
# Rule to create modules.order file
|
|
#
|
|
# Create commands to either record .ko file or cat modules.order from
|
|
# a subdirectory
|
|
$(modorder-target): $(subdir-ym) FORCE
|
|
$(Q){ $(foreach m, $(modorder), \
|
|
$(if $(filter %/modules.order, $m), cat $m, echo $m);) :; } \
|
|
| $(AWK) '!x[$$0]++' - > $@
|
|
|
|
#
|
|
# Rule to compile a set of .o files into one .a file (with symbol table)
|
|
#
|
|
ifdef lib-target
|
|
|
|
$(lib-target): $(lib-y) FORCE
|
|
$(call if_changed,ar)
|
|
|
|
targets += $(lib-target)
|
|
|
|
dummy-object = $(obj)/.lib_exports.o
|
|
ksyms-lds = $(dot-target).lds
|
|
|
|
quiet_cmd_export_list = EXPORTS $@
|
|
cmd_export_list = $(OBJDUMP) -h $< | \
|
|
sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/EXTERN(\1)/p' >$(ksyms-lds);\
|
|
rm -f $(dummy-object);\
|
|
echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\
|
|
$(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
|
|
rm $(dummy-object) $(ksyms-lds)
|
|
|
|
$(obj)/lib-ksyms.o: $(lib-target) FORCE
|
|
$(call if_changed,export_list)
|
|
|
|
targets += $(obj)/lib-ksyms.o
|
|
|
|
endif
|
|
|
|
# NOTE:
|
|
# Do not replace $(filter %.o,^) with $(real-prereqs). When a single object
|
|
# module is turned into a multi object module, $^ will contain header file
|
|
# dependencies recorded in the .*.cmd file.
|
|
quiet_cmd_link_multi-m = LD [M] $@
|
|
cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^)
|
|
|
|
$(multi-used-m): FORCE
|
|
$(call if_changed,link_multi-m)
|
|
$(call multi_depend, $(multi-used-m), .o, -objs -y -m)
|
|
|
|
targets += $(multi-used-m)
|
|
targets := $(filter-out $(PHONY), $(targets))
|
|
|
|
# Add intermediate targets:
|
|
# When building objects with specific suffix patterns, add intermediate
|
|
# targets that the final targets are derived from.
|
|
intermediate_targets = $(foreach sfx, $(2), \
|
|
$(patsubst %$(strip $(1)),%$(sfx), \
|
|
$(filter %$(strip $(1)), $(targets))))
|
|
# %.asn1.o <- %.asn1.[ch] <- %.asn1
|
|
# %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
|
|
# %.lex.o <- %.lex.c <- %.l
|
|
# %.tab.o <- %.tab.[ch] <- %.y
|
|
targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \
|
|
$(call intermediate_targets, .dtb.o, .dtb.S .dtb) \
|
|
$(call intermediate_targets, .lex.o, .lex.c) \
|
|
$(call intermediate_targets, .tab.o, .tab.c .tab.h)
|
|
|
|
# Descending
|
|
# ---------------------------------------------------------------------------
|
|
|
|
PHONY += $(subdir-ym)
|
|
$(subdir-ym):
|
|
$(Q)$(MAKE) $(build)=$@ \
|
|
need-builtin=$(if $(filter $@/built-in.a, $(subdir-obj-y)),1) \
|
|
need-modorder=$(if $(need-modorder),$(if $(filter $@/modules.order, $(modorder)),1))
|
|
|
|
# Add FORCE to the prequisites of a target to force it to be always rebuilt.
|
|
# ---------------------------------------------------------------------------
|
|
|
|
PHONY += FORCE
|
|
|
|
FORCE:
|
|
|
|
# Read all saved command lines and dependencies for the $(targets) we
|
|
# may be building above, using $(if_changed{,_dep}). As an
|
|
# optimization, we don't need to read them if the target does not
|
|
# exist, we will rebuild anyway in that case.
|
|
|
|
existing-targets := $(wildcard $(sort $(targets)))
|
|
|
|
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
|
|
|
|
ifdef building_out_of_srctree
|
|
# Create directories for object files if they do not exist
|
|
obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets))))
|
|
# If targets exist, their directories apparently exist. Skip mkdir.
|
|
existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets))))
|
|
obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs)))
|
|
ifneq ($(obj-dirs),)
|
|
$(shell mkdir -p $(obj-dirs))
|
|
endif
|
|
endif
|
|
|
|
.PHONY: $(PHONY)
|