mirror of
https://github.com/torvalds/linux.git
synced 2026-01-25 15:03:52 +08:00
9c2d1328f8
The objtool, sanitizers (KASAN, UBSAN, etc.), and profilers (GCOV, etc.) are intended only for kernel space objects. For instance, the following are not kernel objects, and therefore should opt out of coverage: - vDSO - purgatory - bootloader (arch/*/boot/) However, to exclude these from coverage, you need to explicitly set OBJECT_FILES_NON_STNDARD=y, KASAN_SANITIZE=n, etc. Kbuild can achieve this without relying on such variables because objects not directly linked to vmlinux or modules are considered "non-standard objects". Detecting standard objects is straightforward: - objects added to obj-y or lib-y are linked to vmlinux - objects added to obj-m are linked to modules There are some exceptional Makefiles (e.g., arch/s390/boot/Makefile, arch/xtensa/boot/lib/Makefile) that use obj-y or lib-y for non-kernel space objects, but they can be fixed later if necessary. Going forward, objects that are not listed in obj-y, lib-y, or obj-m will opt out of objtool, sanitizers, and profilers by default. You can still override the Kbuild decision by explicitly specifying OBJECT_FILES_NON_STANDARD, KASAN_SANITIZE, etc. but most of such Make variables can be removed. The next commit will clean up redundant variables. Note: This commit changes the coverage for some objects: - exclude .vmlinux.export.o from UBSAN, KCOV - exclude arch/csky/kernel/vdso/vgettimeofday.o from UBSAN - exclude arch/parisc/kernel/vdso32/vdso32.so from UBSAN - exclude arch/parisc/kernel/vdso64/vdso64.so from UBSAN - exclude arch/x86/um/vdso/um_vdso.o from UBSAN - exclude drivers/misc/lkdtm/rodata.o from UBSAN, KCOV - exclude init/version-timestamp.o from UBSAN, KCOV - exclude lib/test_fortify/*.o from all santizers and profilers I believe these are positive effects. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Kees Cook <keescook@chromium.org> Tested-by: Roberto Sassu <roberto.sassu@huawei.com>
519 lines
17 KiB
Makefile
519 lines
17 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
# ==========================================================================
|
|
# Building
|
|
# ==========================================================================
|
|
|
|
src := $(if $(VPATH),$(VPATH)/)$(obj)
|
|
|
|
PHONY := $(obj)/
|
|
$(obj)/:
|
|
|
|
# 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-y :=
|
|
always-m :=
|
|
targets :=
|
|
subdir-y :=
|
|
subdir-m :=
|
|
EXTRA_AFLAGS :=
|
|
EXTRA_CFLAGS :=
|
|
EXTRA_CPPFLAGS :=
|
|
EXTRA_LDFLAGS :=
|
|
asflags-y :=
|
|
ccflags-y :=
|
|
rustflags-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 $(srctree)/scripts/Kbuild.include
|
|
include $(srctree)/scripts/Makefile.compiler
|
|
include $(kbuild-file)
|
|
include $(srctree)/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 $(srctree)/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 $(srctree)/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)))
|
|
subdir-dtbslist := $(sort $(filter %/dtbs-list, $(dtb-y)))
|
|
|
|
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 := $(foreach x, o mod, \
|
|
$(patsubst %.o, %.$x, $(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 $(KDOCFLAGS) \
|
|
$(if $(findstring 2, $(KBUILD_EXTRA_WARN)), -Wall) \
|
|
$<
|
|
endif
|
|
|
|
# Compile C sources (.c)
|
|
# ---------------------------------------------------------------------------
|
|
|
|
quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
|
|
cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS) $(CC_FLAGS_LTO), $(c_flags)) -fverbose-asm -S -o $@ $<
|
|
|
|
$(obj)/%.s: $(obj)/%.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: $(obj)/%.c FORCE
|
|
$(call if_changed_dep,cpp_i_c)
|
|
|
|
genksyms = scripts/genksyms/genksyms \
|
|
$(if $(1), -T $(2)) \
|
|
$(if $(KBUILD_PRESERVE), -p) \
|
|
-r $(or $(wildcard $(2:.symtypes=.symref)), /dev/null)
|
|
|
|
# These mirror gensymtypes_S and co below, keep them in synch.
|
|
cmd_gensymtypes_c = $(CPP) -D__GENKSYMS__ $(c_flags) $< | $(genksyms)
|
|
|
|
quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
|
|
cmd_cc_symtypes_c = $(call cmd_gensymtypes_c,true,$@) >/dev/null
|
|
|
|
$(obj)/%.symtypes : $(obj)/%.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 -fno-discard-value-names -o $@ $<
|
|
|
|
$(obj)/%.ll: $(obj)/%.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)
|
|
|
|
is-single-obj-m = $(and $(part-of-module),$(filter $@, $(obj-m)),y)
|
|
|
|
# When a module consists of a single object, there is no reason to keep LLVM IR.
|
|
# Make $(LD) covert LLVM IR to ELF here.
|
|
ifdef CONFIG_LTO_CLANG
|
|
cmd_ld_single_m = $(if $(is-single-obj-m), ; $(LD) $(ld_flags) -r -o $(tmp-target) $@; mv $(tmp-target) $@)
|
|
endif
|
|
|
|
quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
|
|
cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< \
|
|
$(cmd_ld_single_m) \
|
|
$(cmd_objtool)
|
|
|
|
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 __export_symbol_*, 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 dump them into the .cmd file.
|
|
# o modpost will extract versions from that file and create *.c files that will
|
|
# be compiled and linked to the kernel and/or modules.
|
|
|
|
gen_symversions = \
|
|
if $(NM) $@ 2>/dev/null | grep -q ' __export_symbol_'; then \
|
|
$(call cmd_gensymtypes_$(1),$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
|
|
>> $(dot-target).cmd; \
|
|
fi
|
|
|
|
cmd_gen_symversions_c = $(call gen_symversions,c)
|
|
|
|
endif
|
|
|
|
ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
|
|
# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
|
|
ifdef BUILD_C_RECORDMCOUNT
|
|
ifeq ("$(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 # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
|
|
|
|
# '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
|
|
|
|
is-standard-object = $(if $(filter-out y%, $(OBJECT_FILES_NON_STANDARD_$(target-stem).o)$(OBJECT_FILES_NON_STANDARD)n),$(is-kernel-object))
|
|
|
|
$(obj)/%.o: private objtool-enabled = $(if $(is-standard-object),$(if $(delay-objtool),$(is-single-obj-m),y))
|
|
|
|
ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)
|
|
cmd_warn_shared_object = $(if $(word 2, $(modname-multi)),$(warning $(kbuild-file): $*.o is added to multiple modules: $(modname-multi)))
|
|
endif
|
|
|
|
define rule_cc_o_c
|
|
$(call cmd_and_fixdep,cc_o_c)
|
|
$(call cmd,checksrc)
|
|
$(call cmd,checkdoc)
|
|
$(call cmd,gen_objtooldep)
|
|
$(call cmd,gen_symversions_c)
|
|
$(call cmd,record_mcount)
|
|
$(call cmd,warn_shared_object)
|
|
endef
|
|
|
|
define rule_as_o_S
|
|
$(call cmd_and_fixdep,as_o_S)
|
|
$(call cmd,gen_objtooldep)
|
|
$(call cmd,gen_symversions_S)
|
|
$(call cmd,warn_shared_object)
|
|
endef
|
|
|
|
# Built-in and composite module parts
|
|
$(obj)/%.o: $(obj)/%.c $(recordmcount_source) FORCE
|
|
$(call if_changed_rule,cc_o_c)
|
|
$(call cmd,force_checksrc)
|
|
|
|
# To make this rule robust against "Argument list too long" error,
|
|
# ensure to add $(obj)/ prefix by a shell command.
|
|
cmd_mod = printf '%s\n' $(call real-search, $*.o, .o, -objs -y -m) | \
|
|
$(AWK) '!x[$$0]++ { print("$(obj)/"$$0) }' > $@
|
|
|
|
$(obj)/%.mod: 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: $(obj)/%.c FORCE
|
|
$(call if_changed_dep,cc_lst_c)
|
|
|
|
# Compile Rust sources (.rs)
|
|
# ---------------------------------------------------------------------------
|
|
|
|
rust_allowed_features := new_uninit,offset_of
|
|
|
|
# `--out-dir` is required to avoid temporaries being created by `rustc` in the
|
|
# current working directory, which may be not accessible in the out-of-tree
|
|
# modules case.
|
|
rust_common_cmd = \
|
|
RUST_MODFILE=$(modfile) $(RUSTC_OR_CLIPPY) $(rust_flags) \
|
|
-Zallow-features=$(rust_allowed_features) \
|
|
-Zcrate-attr=no_std \
|
|
-Zcrate-attr='feature($(rust_allowed_features))' \
|
|
--extern alloc --extern kernel \
|
|
--crate-type rlib -L $(objtree)/rust/ \
|
|
--crate-name $(basename $(notdir $@)) \
|
|
--sysroot=/dev/null \
|
|
--out-dir $(dir $@) --emit=dep-info=$(depfile)
|
|
|
|
# `--emit=obj`, `--emit=asm` and `--emit=llvm-ir` imply a single codegen unit
|
|
# will be used. We explicitly request `-Ccodegen-units=1` in any case, and
|
|
# the compiler shows a warning if it is not 1. However, if we ever stop
|
|
# requesting it explicitly and we start using some other `--emit` that does not
|
|
# imply it (and for which codegen is performed), then we would be out of sync,
|
|
# i.e. the outputs we would get for the different single targets (e.g. `.ll`)
|
|
# would not match each other.
|
|
|
|
quiet_cmd_rustc_o_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
|
|
cmd_rustc_o_rs = $(rust_common_cmd) --emit=obj=$@ $<
|
|
|
|
$(obj)/%.o: $(obj)/%.rs FORCE
|
|
+$(call if_changed_dep,rustc_o_rs)
|
|
|
|
quiet_cmd_rustc_rsi_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
|
|
cmd_rustc_rsi_rs = \
|
|
$(rust_common_cmd) -Zunpretty=expanded $< >$@; \
|
|
command -v $(RUSTFMT) >/dev/null && $(RUSTFMT) $@
|
|
|
|
$(obj)/%.rsi: $(obj)/%.rs FORCE
|
|
+$(call if_changed_dep,rustc_rsi_rs)
|
|
|
|
quiet_cmd_rustc_s_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
|
|
cmd_rustc_s_rs = $(rust_common_cmd) --emit=asm=$@ $<
|
|
|
|
$(obj)/%.s: $(obj)/%.rs FORCE
|
|
+$(call if_changed_dep,rustc_s_rs)
|
|
|
|
quiet_cmd_rustc_ll_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
|
|
cmd_rustc_ll_rs = $(rust_common_cmd) --emit=llvm-ir=$@ $<
|
|
|
|
$(obj)/%.ll: $(obj)/%.rs FORCE
|
|
+$(call if_changed_dep,rustc_ll_rs)
|
|
|
|
# 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>" ; \
|
|
$(NM) $@ | sed -n 's/.* __export_symbol_\(.*\)/EXPORT_SYMBOL(\1);/p' ; } | \
|
|
$(CPP) -D__GENKSYMS__ $(c_flags) -xc - | $(genksyms)
|
|
|
|
quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
|
|
cmd_cc_symtypes_S = $(call cmd_gensymtypes_S,true,$@) >/dev/null
|
|
|
|
$(obj)/%.symtypes : $(obj)/%.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: $(obj)/%.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 $@ $< $(cmd_objtool)
|
|
|
|
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_gen_symversions_S = $(call gen_symversions,S)
|
|
|
|
endif
|
|
|
|
$(obj)/%.o: $(obj)/%.S 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 += $(real-dtb-y) $(lib-y) $(always-y)
|
|
|
|
# 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)/% ;
|
|
$(subdir-dtbslist): $(obj)/%/dtbs-list: $(obj)/% ;
|
|
|
|
#
|
|
# Rule to compile a set of .o files into one .a file (without symbol table)
|
|
#
|
|
# To make this rule robust against "Argument list too long" error,
|
|
# remove $(obj)/ prefix, and restore it by a shell command.
|
|
|
|
quiet_cmd_ar_builtin = AR $@
|
|
cmd_ar_builtin = rm -f $@; \
|
|
$(if $(real-prereqs), printf "$(obj)/%s " $(patsubst $(obj)/%,%,$(real-prereqs)) | xargs) \
|
|
$(AR) cDPrST $@
|
|
|
|
$(obj)/built-in.a: $(real-obj-y) FORCE
|
|
$(call if_changed,ar_builtin)
|
|
|
|
#
|
|
# Rule to create modules.order and dtbs-list
|
|
#
|
|
# This is a list of build artifacts (module or dtb) from the current Makefile
|
|
# and its sub-directories. The timestamp should be updated when any of the
|
|
# member files.
|
|
|
|
cmd_gen_order = { $(foreach m, $(real-prereqs), \
|
|
$(if $(filter %/$(notdir $@), $m), cat $m, echo $m);) :; } \
|
|
> $@
|
|
|
|
$(obj)/modules.order: $(obj-m) FORCE
|
|
$(call if_changed,gen_order)
|
|
|
|
$(obj)/dtbs-list: $(dtb-y) FORCE
|
|
$(call if_changed,gen_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)
|
|
|
|
quiet_cmd_ld_multi_m = LD [M] $@
|
|
cmd_ld_multi_m = $(LD) $(ld_flags) -r -o $@ @$< $(cmd_objtool)
|
|
|
|
define rule_ld_multi_m
|
|
$(call cmd_and_savecmd,ld_multi_m)
|
|
$(call cmd,gen_objtooldep)
|
|
endef
|
|
|
|
$(multi-obj-m): private objtool-enabled := $(delay-objtool)
|
|
$(multi-obj-m): private part-of-module := y
|
|
$(multi-obj-m): %.o: %.mod FORCE
|
|
$(call if_changed_rule,ld_multi_m)
|
|
$(call multi_depend, $(multi-obj-m), .o, -objs -y -m)
|
|
|
|
# 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
|
|
# %.dtbo.o <- %.dtbo.S <- %.dtbo <- %.dtso
|
|
# %.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, .dtbo.o, .dtbo.S .dtbo) \
|
|
$(call intermediate_targets, .lex.o, .lex.c) \
|
|
$(call intermediate_targets, .tab.o, .tab.c .tab.h)
|
|
|
|
# Build
|
|
# ---------------------------------------------------------------------------
|
|
|
|
$(obj)/: $(if $(KBUILD_BUILTIN), $(targets-for-builtin)) \
|
|
$(if $(KBUILD_MODULES), $(targets-for-modules)) \
|
|
$(subdir-ym) $(always-y)
|
|
@:
|
|
|
|
# Single targets
|
|
# ---------------------------------------------------------------------------
|
|
|
|
single-subdirs := $(foreach d, $(subdir-ym), $(if $(filter $d/%, $(MAKECMDGOALS)), $d))
|
|
single-subdir-goals := $(filter $(addsuffix /%, $(single-subdirs)), $(MAKECMDGOALS))
|
|
|
|
$(single-subdir-goals): $(single-subdirs)
|
|
@:
|
|
|
|
# Descending
|
|
# ---------------------------------------------------------------------------
|
|
|
|
PHONY += $(subdir-ym)
|
|
$(subdir-ym):
|
|
$(Q)$(MAKE) $(build)=$@ \
|
|
need-builtin=$(if $(filter $@/built-in.a, $(subdir-builtin)),1) \
|
|
need-modorder=$(if $(filter $@/modules.order, $(subdir-modorder)),1) \
|
|
$(filter $@/%, $(single-subdir-goals))
|
|
|
|
# Add FORCE to the prequisites of a target to force it to be always rebuilt.
|
|
# ---------------------------------------------------------------------------
|
|
|
|
PHONY += FORCE
|
|
|
|
FORCE:
|
|
|
|
targets += $(filter-out $(single-subdir-goals), $(MAKECMDGOALS))
|
|
targets := $(filter-out $(PHONY), $(targets))
|
|
|
|
# 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)
|