dc5723b02e
This change adds build system support for Clang's Link Time Optimization (LTO). With -flto, instead of ELF object files, Clang produces LLVM bitcode, which is compiled into native code at link time, allowing the final binary to be optimized globally. For more details, see: https://llvm.org/docs/LinkTimeOptimization.html The Kconfig option CONFIG_LTO_CLANG is implemented as a choice, which defaults to LTO being disabled. To use LTO, the architecture must select ARCH_SUPPORTS_LTO_CLANG and support: - compiling with Clang, - compiling all assembly code with Clang's integrated assembler, - and linking with LLD. While using CONFIG_LTO_CLANG_FULL results in the best runtime performance, the compilation is not scalable in time or memory. CONFIG_LTO_CLANG_THIN enables ThinLTO, which allows parallel optimization and faster incremental builds. ThinLTO is used by default if the architecture also selects ARCH_SUPPORTS_LTO_CLANG_THIN: https://clang.llvm.org/docs/ThinLTO.html To enable LTO, LLVM tools must be used to handle bitcode files, by passing LLVM=1 and LLVM_IAS=1 options to make: $ make LLVM=1 LLVM_IAS=1 defconfig $ scripts/config -e LTO_CLANG_THIN $ make LLVM=1 LLVM_IAS=1 To prepare for LTO support with other compilers, common parts are gated behind the CONFIG_LTO option, and LTO can be disabled for specific files by filtering out CC_FLAGS_LTO. Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20201211184633.3213045-3-samitolvanen@google.com
532 lines
18 KiB
Makefile
532 lines
18 KiB
Makefile
# 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) $(CC_FLAGS_LTO), $(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_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)), \
|
|
$(sub_cmd_record_mcount))
|
|
endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
|
|
|
|
ifdef CONFIG_STACK_VALIDATION
|
|
ifneq ($(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_X86_SMAP
|
|
objtool_args += --uaccess
|
|
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
|
|
$(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.
|
|
ifdef CONFIG_LTO_CLANG
|
|
quiet_cmd_link_multi-m = AR [M] $@
|
|
cmd_link_multi-m = \
|
|
rm -f $@; \
|
|
$(AR) cDPrsT $@ $(filter %.o,$^)
|
|
else
|
|
quiet_cmd_link_multi-m = LD [M] $@
|
|
cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^)
|
|
endif
|
|
|
|
$(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)
|