| # 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 |
| |
| # For backward compatibility check that these variables do not change |
| save-cflags := $(CFLAGS) |
| |
| # 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 $(kbuild-file) |
| |
| # If the save-* variables changed error out |
| ifeq ($(KBUILD_NOPEDANTIC),) |
| ifneq ("$(save-cflags)","$(CFLAGS)") |
| $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y) |
| endif |
| endif |
| |
| include scripts/Makefile.lib |
| |
| ifdef host-progs |
| ifneq ($(hostprogs-y),$(host-progs)) |
| $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!) |
| hostprogs-y += $(host-progs) |
| endif |
| endif |
| |
| # Do not include host rules unless needed |
| ifneq ($(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 |
| obj-y += $(obj)/lib-ksyms.o |
| endif |
| |
| ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),) |
| builtin-target := $(obj)/built-in.o |
| 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) $(always) |
| @: |
| |
| # Linus' kernel sanity checking tool |
| ifneq ($(KBUILD_CHECKSRC),0) |
| ifeq ($(KBUILD_CHECKSRC),2) |
| quiet_cmd_force_checksrc = CHECK $< |
| cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; |
| else |
| quiet_cmd_checksrc = CHECK $< |
| cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; |
| endif |
| endif |
| |
| # Do section mismatch analysis for each module/built-in.o |
| 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-objs-m) : part-of-module := y |
| $(real-objs-m:.o=.i) : part-of-module := y |
| $(real-objs-m:.o=.s) : part-of-module := y |
| $(real-objs-m:.o=.lst): part-of-module := y |
| |
| $(real-objs-m) : quiet_modtag := [M] |
| $(real-objs-m:.o=.i) : quiet_modtag := [M] |
| $(real-objs-m:.o=.s) : quiet_modtag := [M] |
| $(real-objs-m:.o=.lst): quiet_modtag := [M] |
| |
| $(obj-m) : quiet_modtag := [M] |
| |
| # Default for not multi-part modules |
| modname = $(basetarget) |
| |
| $(multi-objs-m) : modname = $(modname-multi) |
| $(multi-objs-m:.o=.i) : modname = $(modname-multi) |
| $(multi-objs-m:.o=.s) : modname = $(modname-multi) |
| $(multi-objs-m:.o=.lst) : modname = $(modname-multi) |
| $(multi-objs-y) : modname = $(modname-multi) |
| $(multi-objs-y:.o=.i) : modname = $(modname-multi) |
| $(multi-objs-y:.o=.s) : modname = $(modname-multi) |
| $(multi-objs-y:.o=.lst) : modname = $(modname-multi) |
| |
| 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)) \ |
| $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \ |
| $(patsubst y,-R,$(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) $(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) $@; \ |
| fi; |
| endif |
| |
| ifdef CONFIG_FTRACE_MCOUNT_RECORD |
| ifdef BUILD_C_RECORDMCOUNT |
| ifeq ("$(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) $(KBUILD_CFLAGS)" \ |
| "$(LD)" "$(NM)" "$(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 \ |
| $(sub_cmd_record_mcount) \ |
| fi; |
| endif # CONFIG_FTRACE_MCOUNT_RECORD |
| |
| ifdef CONFIG_STACK_VALIDATION |
| ifneq ($(SKIP_STACK_VALIDATION),1) |
| |
| __objtool_obj := $(objtree)/tools/objtool/objtool |
| |
| objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check) |
| |
| ifndef CONFIG_FRAME_POINTER |
| objtool_args += --no-fp |
| endif |
| ifdef CONFIG_GCOV_KERNEL |
| objtool_args += --no-unreachable |
| else |
| objtool_args += $(call cc-ifversion, -lt, 0405, --no-unreachable) |
| 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) |
| |
| define rule_cc_o_c |
| $(call echo-cmd,checksrc) $(cmd_checksrc) \ |
| $(call cmd_and_fixdep,cc_o_c) \ |
| $(cmd_modversions_c) \ |
| $(call echo-cmd,objtool) $(cmd_objtool) \ |
| $(call echo-cmd,record_mcount) $(cmd_record_mcount) |
| endef |
| |
| define rule_as_o_S |
| $(call cmd_and_fixdep,as_o_S) \ |
| $(cmd_modversions_S) \ |
| $(call echo-cmd,objtool) $(cmd_objtool) |
| 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-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) |
| $(real-objs-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)) \ |
| $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \ |
| $(patsubst y,-R,$(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) $(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 += $(real-objs-y) $(real-objs-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 $< \ |
| $(subst .h,.c,$@) $(subst .c,.h,$@) |
| |
| .PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.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 |
| |
| ifdef CONFIG_THIN_ARCHIVES |
| cmd_make_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) |
| cmd_make_empty_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) |
| quiet_cmd_link_o_target = AR $@ |
| else |
| cmd_make_builtin = $(LD) $(ld_flags) -r -o |
| cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) |
| quiet_cmd_link_o_target = LD $@ |
| endif |
| |
| # If the list of objects to link is empty, just create an empty built-in.o |
| cmd_link_o_target = $(if $(strip $(obj-y)),\ |
| $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \ |
| $(cmd_secanalysis),\ |
| $(cmd_make_empty_builtin) $@) |
| |
| $(builtin-target): $(obj-y) FORCE |
| $(call if_changed,link_o_target) |
| |
| 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 $@ |
| |
| ifdef CONFIG_THIN_ARCHIVES |
| cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y) |
| else |
| cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y) |
| endif |
| |
| $(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 |
| ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX |
| ref_prefix = EXTERN(_ |
| else |
| ref_prefix = EXTERN( |
| endif |
| |
| quiet_cmd_export_list = EXPORTS $@ |
| cmd_export_list = $(OBJDUMP) -h $< | \ |
| sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/$(ref_prefix)\1)/p' >$(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 |
| |
| # |
| # Rule to link composite objects |
| # |
| # Composite objects are specified in kbuild makefile as follows: |
| # <composite-object>-objs := <list of .o files> |
| # or |
| # <composite-object>-y := <list of .o files> |
| # or |
| # <composite-object>-m := <list of .o files> |
| # The -m syntax only works if <composite object> is a module |
| link_multi_deps = \ |
| $(filter $(addprefix $(obj)/, \ |
| $($(subst $(obj)/,,$(@:.o=-objs))) \ |
| $($(subst $(obj)/,,$(@:.o=-y))) \ |
| $($(subst $(obj)/,,$(@:.o=-m)))), $^) |
| |
| cmd_link_multi-link = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis) |
| |
| ifdef CONFIG_THIN_ARCHIVES |
| quiet_cmd_link_multi-y = AR $@ |
| cmd_link_multi-y = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(link_multi_deps) |
| else |
| quiet_cmd_link_multi-y = LD $@ |
| cmd_link_multi-y = $(cmd_link_multi-link) |
| endif |
| |
| quiet_cmd_link_multi-m = LD [M] $@ |
| cmd_link_multi-m = $(cmd_link_multi-link) |
| |
| $(multi-used-y): FORCE |
| $(call if_changed,link_multi-y) |
| $(call multi_depend, $(multi-used-y), .o, -objs -y) |
| |
| $(multi-used-m): FORCE |
| $(call if_changed,link_multi-m) |
| @{ echo $(@:.o=.ko); echo $(link_multi_deps); \ |
| $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) |
| $(call multi_depend, $(multi-used-m), .o, -objs -y -m) |
| |
| targets += $(multi-used-y) $(multi-used-m) |
| targets := $(filter-out $(PHONY), $(targets)) |
| |
| # Descending |
| # --------------------------------------------------------------------------- |
| |
| PHONY += $(subdir-ym) |
| $(subdir-ym): |
| $(Q)$(MAKE) $(build)=$@ |
| |
| # 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. |
| |
| cmd_files := $(wildcard $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) |
| |
| ifneq ($(cmd_files),) |
| include $(cmd_files) |
| endif |
| |
| ifneq ($(KBUILD_SRC),) |
| # Create directories for object files if they do not exist |
| obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets)))) |
| # If cmd_files exist, their directories apparently exist. Skip mkdir. |
| exist-dirs := $(sort $(patsubst %/,%, $(dir $(cmd_files)))) |
| obj-dirs := $(strip $(filter-out $(exist-dirs), $(obj-dirs))) |
| ifneq ($(obj-dirs),) |
| $(shell mkdir -p $(obj-dirs)) |
| endif |
| endif |
| |
| # Declare the contents of the .PHONY variable as phony. We keep that |
| # information in a variable se we can use it in if_changed and friends. |
| |
| .PHONY: $(PHONY) |
