forked from Minki/linux
392885ee82
Currently, fixdep writes dependencies to .*.tmp, which is renamed to .*.cmd after everything succeeds. This is a very safe way to avoid corrupted .*.cmd files. The if_changed_dep has carried this safety mechanism since it was added in 2002. If fixdep fails for some reasons or a user terminates the build while fixdep is running, the incomplete output from the fixdep could be troublesome. This is my insight about some bad scenarios: [1] If the compiler succeeds to generate *.o file, but fixdep fails to write necessary dependencies to .*.cmd file, Make will miss to rebuild the object when headers or CONFIG options are changed. In this case, fixdep should not generate .*.cmd file at all so that 'arg-check' will surely trigger the rebuild of the object. [2] A partially constructed .*.cmd file may not be a syntactically correct makefile. The next time Make runs, it would include it, then fail to parse it. Once this happens, 'make clean' is be the only way to fix it. In fact, [1] is no longer a problem since commit9c2af1c737
("kbuild: add .DELETE_ON_ERROR special target"). Make deletes a target file on any failure in its recipe. Because fixdep is a part of the recipe of *.o target, if it fails, the *.o is deleted anyway. However, I am a bit worried about the slight possibility of [2]. So, here is a solution. Let fixdep directly write to a .*.cmd file, but allow makefiles to include it only when its corresponding target exists. This effectively reverts commit2982c95357
("kbuild: remove redundant $(wildcard ...) for cmd_files calculation"), and commit00d78ab2ba
("kbuild: remove dead code in cmd_files calculation in top Makefile") because now we must check the presence of targets. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
552 lines
18 KiB
Makefile
552 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 :=
|
|
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 $(kbuild-file)
|
|
|
|
include scripts/Makefile.lib
|
|
|
|
# Do not include host rules unless needed
|
|
ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
|
|
include scripts/Makefile.host
|
|
endif
|
|
|
|
ifndef obj
|
|
$(warning kbuild: Makefile.build is included improperly)
|
|
endif
|
|
|
|
# ===========================================================================
|
|
|
|
ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
|
|
lib-target := $(obj)/lib.a
|
|
real-obj-y += $(obj)/lib-ksyms.o
|
|
endif
|
|
|
|
ifneq ($(strip $(real-obj-y) $(need-builtin)),)
|
|
builtin-target := $(obj)/built-in.a
|
|
endif
|
|
|
|
modorder-target := $(obj)/modules.order
|
|
|
|
# We keep a list of all modules in $(MODVERDIR)
|
|
|
|
__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
|
|
$(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
|
|
$(subdir-ym) $(always)
|
|
@:
|
|
|
|
# Linus' kernel sanity checking tool
|
|
ifeq ($(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_ENABLE_EXTRA_GCC_CHECKS),)
|
|
cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $< ;
|
|
endif
|
|
|
|
# Do section mismatch analysis for each module/built-in.a
|
|
ifdef CONFIG_DEBUG_SECTION_MISMATCH
|
|
cmd_secanalysis = ; scripts/mod/modpost $@
|
|
endif
|
|
|
|
# Compile C sources (.c)
|
|
# ---------------------------------------------------------------------------
|
|
|
|
# Default is built-in, unless we know otherwise
|
|
modkern_cflags = \
|
|
$(if $(part-of-module), \
|
|
$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
|
|
$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
|
|
quiet_modtag := $(empty) $(empty)
|
|
|
|
$(real-obj-m) : part-of-module := y
|
|
$(real-obj-m:.o=.i) : part-of-module := y
|
|
$(real-obj-m:.o=.s) : part-of-module := y
|
|
$(real-obj-m:.o=.lst): part-of-module := y
|
|
|
|
$(real-obj-m) : quiet_modtag := [M]
|
|
$(real-obj-m:.o=.i) : quiet_modtag := [M]
|
|
$(real-obj-m:.o=.s) : quiet_modtag := [M]
|
|
$(real-obj-m:.o=.lst): quiet_modtag := [M]
|
|
|
|
$(obj-m) : quiet_modtag := [M]
|
|
|
|
quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
|
|
cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -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) $< | \
|
|
$(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 = \
|
|
set -e; \
|
|
$(call cmd_gensymtypes_c,true,$@) >/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) $@
|
|
|
|
ifndef CONFIG_MODVERSIONS
|
|
cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
|
|
|
|
else
|
|
# When module versioning is enabled the following steps are executed:
|
|
# o compile a .tmp_<file>.o from <file>.c
|
|
# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
|
|
# not export symbols, we just rename .tmp_<file>.o to <file>.o and
|
|
# are 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 <file>.o from .tmp_<file>.o using the linker to
|
|
# replace the unresolved symbols __crc_exported_symbol with
|
|
# the actual value of the checksum generated by genksyms
|
|
|
|
cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
|
|
|
|
cmd_modversions_c = \
|
|
if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | 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); \
|
|
rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
|
|
else \
|
|
mv -f $(@D)/.tmp_$(@F) $@; \
|
|
fi;
|
|
endif
|
|
|
|
ifdef CONFIG_FTRACE_MCOUNT_RECORD
|
|
ifndef CC_USING_RECORD_MCOUNT
|
|
# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
|
|
ifdef BUILD_C_RECORDMCOUNT
|
|
ifeq ("$(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 = set -e ; 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 $(CC_FLAGS_FTRACE),$(_c_flags))" = \
|
|
"$(CC_FLAGS_FTRACE)" ]; then \
|
|
$(sub_cmd_record_mcount) \
|
|
fi;
|
|
endif # CC_USING_RECORD_MCOUNT
|
|
endif # CONFIG_FTRACE_MCOUNT_RECORD
|
|
|
|
ifdef CONFIG_STACK_VALIDATION
|
|
ifneq ($(SKIP_STACK_VALIDATION),1)
|
|
|
|
__objtool_obj := $(objtree)/tools/objtool/objtool
|
|
|
|
objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check)
|
|
|
|
objtool_args += $(if $(part-of-module), --module,)
|
|
|
|
ifndef CONFIG_FRAME_POINTER
|
|
objtool_args += --no-fp
|
|
endif
|
|
ifdef CONFIG_GCOV_KERNEL
|
|
objtool_args += --no-unreachable
|
|
endif
|
|
ifdef CONFIG_RETPOLINE
|
|
ifneq ($(RETPOLINE_CFLAGS),)
|
|
objtool_args += --retpoline
|
|
endif
|
|
endif
|
|
|
|
|
|
ifdef CONFIG_MODVERSIONS
|
|
objtool_o = $(@D)/.tmp_$(@F)
|
|
else
|
|
objtool_o = $(@)
|
|
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_o)";)
|
|
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)
|
|
|
|
define rule_cc_o_c
|
|
$(call echo-cmd,checksrc) $(cmd_checksrc) \
|
|
$(call cmd_and_fixdep,cc_o_c) \
|
|
$(cmd_checkdoc) \
|
|
$(call echo-cmd,objtool) $(cmd_objtool) \
|
|
$(cmd_modversions_c) \
|
|
$(call echo-cmd,record_mcount) $(cmd_record_mcount)
|
|
endef
|
|
|
|
define rule_as_o_S
|
|
$(call cmd_and_fixdep,as_o_S) \
|
|
$(call echo-cmd,objtool) $(cmd_objtool) \
|
|
$(cmd_modversions_S)
|
|
endef
|
|
|
|
# List module undefined symbols (or empty line if not enabled)
|
|
ifdef CONFIG_TRIM_UNUSED_KSYMS
|
|
cmd_undef_syms = $(NM) $@ | sed -n 's/^ *U //p' | xargs echo
|
|
else
|
|
cmd_undef_syms = echo
|
|
endif
|
|
|
|
# Built-in and composite module parts
|
|
$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
|
|
$(call cmd,force_checksrc)
|
|
$(call if_changed_rule,cc_o_c)
|
|
|
|
# Single-part modules are special since we need to mark them in $(MODVERDIR)
|
|
|
|
$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
|
|
$(call cmd,force_checksrc)
|
|
$(call if_changed_rule,cc_o_c)
|
|
@{ echo $(@:.o=.ko); echo $@; \
|
|
$(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.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)
|
|
# ---------------------------------------------------------------------------
|
|
|
|
modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
|
|
|
|
$(real-obj-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
|
|
$(real-obj-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
|
|
|
|
# .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 - | \
|
|
$(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 = \
|
|
set -e; \
|
|
$(call cmd_gensymtypes_S,true,$@) >/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) $@
|
|
|
|
ifndef CONFIG_MODVERSIONS
|
|
cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
|
|
|
|
else
|
|
|
|
ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
|
|
|
|
ifeq ($(ASM_PROTOTYPES),)
|
|
cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
|
|
|
|
else
|
|
|
|
# versioning matches the C process described above, with difference that
|
|
# we parse asm-prototypes.h C header to get function definitions.
|
|
|
|
cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $<
|
|
|
|
cmd_modversions_S = \
|
|
if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | 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); \
|
|
rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
|
|
else \
|
|
mv -f $(@D)/.tmp_$(@F) $@; \
|
|
fi;
|
|
endif
|
|
endif
|
|
|
|
$(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE
|
|
$(call if_changed_rule,as_o_S)
|
|
|
|
targets += $(filter-out $(subdir-obj-y), $(real-obj-y)) $(real-obj-m) $(lib-y)
|
|
targets += $(extra-y) $(MAKECMDGOALS) $(always)
|
|
|
|
# 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 $@
|
|
cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
|
|
$(subst .h,.c,$@) $(subst .c,.h,$@)
|
|
|
|
$(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
|
|
$(sort $(subdir-obj-y)): $(subdir-ym) ;
|
|
|
|
#
|
|
# Rule to compile a set of .o files into one .o file
|
|
#
|
|
ifdef builtin-target
|
|
|
|
# built-in.a archives are made with no symbol table or index which
|
|
# makes them small and fast, but unable to be used by the linker.
|
|
# scripts/link-vmlinux.sh builds an aggregate built-in.a with a symbol
|
|
# table and index.
|
|
quiet_cmd_ar_builtin = AR $@
|
|
cmd_ar_builtin = rm -f $@; \
|
|
$(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(filter $(real-obj-y), $^)
|
|
|
|
$(builtin-target): $(real-obj-y) FORCE
|
|
$(call if_changed,ar_builtin)
|
|
|
|
targets += $(builtin-target)
|
|
endif # builtin-target
|
|
|
|
#
|
|
# Rule to create modules.order file
|
|
#
|
|
# Create commands to either record .ko file or cat modules.order from
|
|
# a subdirectory
|
|
modorder-cmds = \
|
|
$(foreach m, $(modorder), \
|
|
$(if $(filter %/modules.order, $m), \
|
|
cat $m;, echo kernel/$m;))
|
|
|
|
$(modorder-target): $(subdir-ym) FORCE
|
|
$(Q)(cat /dev/null; $(modorder-cmds)) > $@
|
|
|
|
#
|
|
# Rule to compile a set of .o files into one .a file
|
|
#
|
|
ifdef lib-target
|
|
quiet_cmd_link_l_target = AR $@
|
|
|
|
# lib target archives do get a symbol table and index
|
|
cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y)
|
|
|
|
$(lib-target): $(lib-y) FORCE
|
|
$(call if_changed,link_l_target)
|
|
|
|
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
|
|
|
|
quiet_cmd_link_multi-m = LD [M] $@
|
|
cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^) $(cmd_secanalysis)
|
|
|
|
$(multi-used-m): FORCE
|
|
$(call if_changed,link_multi-m)
|
|
@{ echo $(@:.o=.ko); echo $(filter %.o,$^); \
|
|
$(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
|
|
$(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 $(findstring $@,$(subdir-obj-y)),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 $(f)).cmd)
|
|
|
|
ifneq ($(KBUILD_SRC),)
|
|
# 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
|
|
|
|
# Some files contained in $(targets) are intermediate artifacts.
|
|
# We never want them to be removed automatically.
|
|
.SECONDARY: $(targets)
|
|
|
|
.PHONY: $(PHONY)
|