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Diffstat (limited to 'scripts/Makefile.build')
| -rw-r--r-- | scripts/Makefile.build | 533 |
1 files changed, 533 insertions, 0 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build new file mode 100644 index 000000000..17e8b2065 --- /dev/null +++ b/scripts/Makefile.build @@ -0,0 +1,533 @@ +# SPDX-License-Identifier: GPL-2.0 +# ========================================================================== +# Building +# ========================================================================== + +src := $(obj) + +PHONY := __build +__build: + +# Init all relevant variables used in kbuild files so +# 1) they have correct type +# 2) they do not inherit any value from the environment +obj-y := +obj-m := +lib-y := +lib-m := +always := +always-y := +always-m := +targets := +subdir-y := +subdir-m := +EXTRA_AFLAGS := +EXTRA_CFLAGS := +EXTRA_CPPFLAGS := +EXTRA_LDFLAGS := +asflags-y := +ccflags-y := +cppflags-y := +ldflags-y := + +subdir-asflags-y := +subdir-ccflags-y := + +# Read auto.conf if it exists, otherwise ignore +-include include/config/auto.conf + +include scripts/Kbuild.include + +# The filename Kbuild has precedence over Makefile +kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) +kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile) +include $(kbuild-file) + +include scripts/Makefile.lib + +# Do not include hostprogs rules unless needed. +# $(sort ...) is used here to remove duplicated words and excessive spaces. +hostprogs := $(sort $(hostprogs)) +ifneq ($(hostprogs),) +include scripts/Makefile.host +endif + +# Do not include userprogs rules unless needed. +# $(sort ...) is used here to remove duplicated words and excessive spaces. +userprogs := $(sort $(userprogs)) +ifneq ($(userprogs),) +include scripts/Makefile.userprogs +endif + +ifndef obj +$(warning kbuild: Makefile.build is included improperly) +endif + +ifeq ($(need-modorder),) +ifneq ($(obj-m),) +$(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.) +$(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.) +endif +endif + +# =========================================================================== + +# subdir-builtin and subdir-modorder may contain duplications. Use $(sort ...) +subdir-builtin := $(sort $(filter %/built-in.a, $(real-obj-y))) +subdir-modorder := $(sort $(filter %/modules.order, $(obj-m))) + +targets-for-builtin := $(extra-y) + +ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),) +targets-for-builtin += $(obj)/lib.a +endif + +ifdef need-builtin +targets-for-builtin += $(obj)/built-in.a +endif + +targets-for-modules := $(patsubst %.o, %.mod, $(filter %.o, $(obj-m))) + +ifdef need-modorder +targets-for-modules += $(obj)/modules.order +endif + +targets += $(targets-for-builtin) $(targets-for-modules) + +# Linus' kernel sanity checking tool +ifeq ($(KBUILD_CHECKSRC),1) + quiet_cmd_checksrc = CHECK $< + cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< +else ifeq ($(KBUILD_CHECKSRC),2) + quiet_cmd_force_checksrc = CHECK $< + cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< +endif + +ifneq ($(KBUILD_EXTRA_WARN),) + cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $< +endif + +# Compile C sources (.c) +# --------------------------------------------------------------------------- + +quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ + cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS), $(c_flags)) -fverbose-asm -S -o $@ $< + +$(obj)/%.s: $(src)/%.c FORCE + $(call if_changed_dep,cc_s_c) + +quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@ +cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $< + +$(obj)/%.i: $(src)/%.c FORCE + $(call if_changed_dep,cpp_i_c) + +# These mirror gensymtypes_S and co below, keep them in synch. +cmd_gensymtypes_c = \ + $(CPP) -D__GENKSYMS__ $(c_flags) $< | \ + scripts/genksyms/genksyms $(if $(1), -T $(2)) \ + $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ + $(if $(KBUILD_PRESERVE),-p) \ + -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) + +quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ +cmd_cc_symtypes_c = \ + $(call cmd_gensymtypes_c,true,$@) >/dev/null; \ + test -s $@ || rm -f $@ + +$(obj)/%.symtypes : $(src)/%.c FORCE + $(call cmd,cc_symtypes_c) + +# LLVM assembly +# Generate .ll files from .c +quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@ + cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $< + +$(obj)/%.ll: $(src)/%.c FORCE + $(call if_changed_dep,cc_ll_c) + +# C (.c) files +# The C file is compiled and updated dependency information is generated. +# (See cmd_cc_o_c + relevant part of rule_cc_o_c) + +quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ + cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< + +ifdef CONFIG_MODVERSIONS +# When module versioning is enabled the following steps are executed: +# o compile a <file>.o from <file>.c +# o if <file>.o doesn't contain a __ksymtab version, i.e. does +# not export symbols, it's done. +# o otherwise, we calculate symbol versions using the good old +# genksyms on the preprocessed source and postprocess them in a way +# that they are usable as a linker script +# o generate .tmp_<file>.o from <file>.o using the linker to +# replace the unresolved symbols __crc_exported_symbol with +# the actual value of the checksum generated by genksyms +# o remove .tmp_<file>.o to <file>.o + +cmd_modversions_c = \ + if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \ + $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ + > $(@D)/.tmp_$(@F:.o=.ver); \ + \ + $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \ + -T $(@D)/.tmp_$(@F:.o=.ver); \ + mv -f $(@D)/.tmp_$(@F) $@; \ + rm -f $(@D)/.tmp_$(@F:.o=.ver); \ + fi +endif + +ifdef CONFIG_FTRACE_MCOUNT_RECORD +ifndef CC_USING_RECORD_MCOUNT +# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl +ifdef BUILD_C_RECORDMCOUNT +ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") + RECORDMCOUNT_FLAGS = -w +endif +# Due to recursion, we must skip empty.o. +# The empty.o file is created in the make process in order to determine +# the target endianness and word size. It is made before all other C +# files, including recordmcount. +sub_cmd_record_mcount = \ + if [ $(@) != "scripts/mod/empty.o" ]; then \ + $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ + fi; +recordmcount_source := $(srctree)/scripts/recordmcount.c \ + $(srctree)/scripts/recordmcount.h +else +sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ + "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ + "$(if $(CONFIG_64BIT),64,32)" \ + "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \ + "$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \ + "$(if $(part-of-module),1,0)" "$(@)"; +recordmcount_source := $(srctree)/scripts/recordmcount.pl +endif # BUILD_C_RECORDMCOUNT +cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \ + $(sub_cmd_record_mcount)) +endif # CC_USING_RECORD_MCOUNT +endif # CONFIG_FTRACE_MCOUNT_RECORD + +ifdef CONFIG_STACK_VALIDATION +ifneq ($(SKIP_STACK_VALIDATION),1) + +__objtool_obj := $(objtree)/tools/objtool/objtool + +objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check) + +objtool_args += $(if $(part-of-module), --module,) + +ifndef CONFIG_FRAME_POINTER +objtool_args += --no-fp +endif +ifdef CONFIG_GCOV_KERNEL +objtool_args += --no-unreachable +endif +ifdef CONFIG_RETPOLINE + objtool_args += --retpoline +endif +ifdef CONFIG_RETHUNK + objtool_args += --rethunk +endif +ifdef CONFIG_X86_SMAP + objtool_args += --uaccess +endif +ifdef CONFIG_SLS + objtool_args += --sls +endif + +# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory +# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file +# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file +cmd_objtool = $(if $(patsubst y%,, \ + $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ + $(__objtool_obj) $(objtool_args) $@) +objtool_obj = $(if $(patsubst y%,, \ + $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ + $(__objtool_obj)) + +endif # SKIP_STACK_VALIDATION +endif # CONFIG_STACK_VALIDATION + +# Rebuild all objects when objtool changes, or is enabled/disabled. +objtool_dep = $(objtool_obj) \ + $(wildcard include/config/orc/unwinder.h \ + include/config/stack/validation.h) + +ifdef CONFIG_TRIM_UNUSED_KSYMS +cmd_gen_ksymdeps = \ + $(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd + +# List module undefined symbols +undefined_syms = $(NM) $< | $(AWK) '$$1 == "U" { printf("%s%s", x++ ? " " : "", $$2) }'; +endif + +define rule_cc_o_c + $(call cmd_and_fixdep,cc_o_c) + $(call cmd,gen_ksymdeps) + $(call cmd,checksrc) + $(call cmd,checkdoc) + $(call cmd,objtool) + $(call cmd,modversions_c) + $(call cmd,record_mcount) +endef + +define rule_as_o_S + $(call cmd_and_fixdep,as_o_S) + $(call cmd,gen_ksymdeps) + $(call cmd,objtool) + $(call cmd,modversions_S) +endef + +# Built-in and composite module parts +.SECONDEXPANSION: +$(obj)/%.o: $(src)/%.c $(recordmcount_source) $$(objtool_dep) FORCE + $(call if_changed_rule,cc_o_c) + $(call cmd,force_checksrc) + +cmd_mod = { \ + echo $(if $($*-objs)$($*-y)$($*-m), $(addprefix $(obj)/, $($*-objs) $($*-y) $($*-m)), $(@:.mod=.o)); \ + $(undefined_syms) echo; \ + } > $@ + +$(obj)/%.mod: $(obj)/%.o FORCE + $(call if_changed,mod) + +quiet_cmd_cc_lst_c = MKLST $@ + cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ + $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ + System.map $(OBJDUMP) > $@ + +$(obj)/%.lst: $(src)/%.c FORCE + $(call if_changed_dep,cc_lst_c) + +# Compile assembler sources (.S) +# --------------------------------------------------------------------------- + +# .S file exports must have their C prototypes defined in asm/asm-prototypes.h +# or a file that it includes, in order to get versioned symbols. We build a +# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from +# the .S file (with trailing ';'), and run genksyms on that, to extract vers. +# +# This is convoluted. The .S file must first be preprocessed to run guards and +# expand names, then the resulting exports must be constructed into plain +# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed +# to make the genksyms input. +# +# These mirror gensymtypes_c and co above, keep them in synch. +cmd_gensymtypes_S = \ + { echo "\#include <linux/kernel.h>" ; \ + echo "\#include <asm/asm-prototypes.h>" ; \ + $(CPP) $(a_flags) $< | \ + grep "\<___EXPORT_SYMBOL\>" | \ + sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ; } | \ + $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \ + scripts/genksyms/genksyms $(if $(1), -T $(2)) \ + $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ + $(if $(KBUILD_PRESERVE),-p) \ + -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) + +quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@ +cmd_cc_symtypes_S = \ + $(call cmd_gensymtypes_S,true,$@) >/dev/null; \ + test -s $@ || rm -f $@ + +$(obj)/%.symtypes : $(src)/%.S FORCE + $(call cmd,cc_symtypes_S) + + +quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@ +cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $< + +$(obj)/%.s: $(src)/%.S FORCE + $(call if_changed_dep,cpp_s_S) + +quiet_cmd_as_o_S = AS $(quiet_modtag) $@ + cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< + +ifdef CONFIG_ASM_MODVERSIONS + +# versioning matches the C process described above, with difference that +# we parse asm-prototypes.h C header to get function definitions. + +cmd_modversions_S = \ + if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \ + $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ + > $(@D)/.tmp_$(@F:.o=.ver); \ + \ + $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \ + -T $(@D)/.tmp_$(@F:.o=.ver); \ + mv -f $(@D)/.tmp_$(@F) $@; \ + rm -f $(@D)/.tmp_$(@F:.o=.ver); \ + fi +endif + +$(obj)/%.o: $(src)/%.S $$(objtool_dep) FORCE + $(call if_changed_rule,as_o_S) + +targets += $(filter-out $(subdir-builtin), $(real-obj-y)) +targets += $(filter-out $(subdir-modorder), $(real-obj-m)) +targets += $(lib-y) $(always-y) $(MAKECMDGOALS) + +# Linker scripts preprocessor (.lds.S -> .lds) +# --------------------------------------------------------------------------- +quiet_cmd_cpp_lds_S = LDS $@ + cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \ + -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< + +$(obj)/%.lds: $(src)/%.lds.S FORCE + $(call if_changed_dep,cpp_lds_S) + +# ASN.1 grammar +# --------------------------------------------------------------------------- +quiet_cmd_asn1_compiler = ASN.1 $(basename $@).[ch] + cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \ + $(basename $@).c $(basename $@).h + +$(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler + $(call cmd,asn1_compiler) + +# Build the compiled-in targets +# --------------------------------------------------------------------------- + +# To build objects in subdirs, we need to descend into the directories +$(subdir-builtin): $(obj)/%/built-in.a: $(obj)/% ; +$(subdir-modorder): $(obj)/%/modules.order: $(obj)/% ; + +# +# Rule to compile a set of .o files into one .a file (without symbol table) +# + +quiet_cmd_ar_builtin = AR $@ + cmd_ar_builtin = rm -f $@; $(AR) cDPrST $@ $(real-prereqs) + +$(obj)/built-in.a: $(real-obj-y) FORCE + $(call if_changed,ar_builtin) + +# +# Rule to create modules.order file +# +# Create commands to either record .ko file or cat modules.order from +# a subdirectory +# Add $(obj-m) as the prerequisite to avoid updating the timestamp of +# modules.order unless contained modules are updated. + +cmd_modules_order = { $(foreach m, $(real-prereqs), \ + $(if $(filter %/modules.order, $m), cat $m, echo $(patsubst %.o,%.ko,$m));) :; } \ + | $(AWK) '!x[$$0]++' - > $@ + +$(obj)/modules.order: $(obj-m) FORCE + $(call if_changed,modules_order) + +# +# Rule to compile a set of .o files into one .a file (with symbol table) +# +$(obj)/lib.a: $(lib-y) FORCE + $(call if_changed,ar) + +# 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) + +# Build +# --------------------------------------------------------------------------- + +ifdef single-build + +KBUILD_SINGLE_TARGETS := $(filter $(obj)/%, $(KBUILD_SINGLE_TARGETS)) + +curdir-single := $(sort $(foreach x, $(KBUILD_SINGLE_TARGETS), \ + $(if $(filter $(x) $(basename $(x)).o, $(targets)), $(x)))) + +# Handle single targets without any rule: show "Nothing to be done for ..." or +# "No rule to make target ..." depending on whether the target exists. +unknown-single := $(filter-out $(addsuffix /%, $(subdir-ym)), \ + $(filter-out $(curdir-single), $(KBUILD_SINGLE_TARGETS))) + +single-subdirs := $(foreach d, $(subdir-ym), \ + $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) + +__build: $(curdir-single) $(single-subdirs) +ifneq ($(unknown-single),) + $(Q)$(MAKE) -f /dev/null $(unknown-single) +endif + @: + +ifeq ($(curdir-single),) +# Nothing to do in this directory. Do not include any .*.cmd file for speed-up +targets := +else +targets += $(curdir-single) +endif + +else + +__build: $(if $(KBUILD_BUILTIN), $(targets-for-builtin)) \ + $(if $(KBUILD_MODULES), $(targets-for-modules)) \ + $(subdir-ym) $(always-y) + @: + +endif + +# Descending +# --------------------------------------------------------------------------- + +PHONY += $(subdir-ym) +$(subdir-ym): + $(Q)$(MAKE) $(build)=$@ \ + $(if $(filter $@/, $(KBUILD_SINGLE_TARGETS)),single-build=) \ + need-builtin=$(if $(filter $@/built-in.a, $(subdir-builtin)),1) \ + need-modorder=$(if $(filter $@/modules.order, $(subdir-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) + +# Create directories for object files if they do not exist +obj-dirs := $(sort $(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 + +.PHONY: $(PHONY) |