| # ========================================================================== |
| # 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 := |
| |
| # Read .config if it exist, otherwise ignore |
| -include include/config/auto.conf |
| |
| include scripts/Kbuild.include |
| |
| # For backward compatibility check that these variables does 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 EXTRA_CFLAGS) |
| 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 += $(host-progs) |
| endif |
| endif |
| |
| # Do not include host rules unles needed |
| ifneq ($(hostprogs-y)$(hostprogs-m),) |
| include scripts/Makefile.host |
| endif |
| |
| ifneq ($(KBUILD_SRC),) |
| # Create output directory if not already present |
| _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj)) |
| |
| # Create directories for object files if directory does not exist |
| # Needed when obj-y := dir/file.o syntax is used |
| _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d))) |
| endif |
| |
| ifndef obj |
| $(warning kbuild: Makefile.build is included improperly) |
| endif |
| |
| # =========================================================================== |
| |
| ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),) |
| lib-target := $(obj)/lib.a |
| endif |
| |
| ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(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 |
| |
| |
| # Compile C sources (.c) |
| # --------------------------------------------------------------------------- |
| |
| # Default is built-in, unless we know otherwise |
| modkern_cflags := $(CFLAGS_KERNEL) |
| quiet_modtag := $(empty) $(empty) |
| |
| $(real-objs-m) : modkern_cflags := $(CFLAGS_MODULE) |
| $(real-objs-m:.o=.i) : modkern_cflags := $(CFLAGS_MODULE) |
| $(real-objs-m:.o=.s) : modkern_cflags := $(CFLAGS_MODULE) |
| $(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE) |
| |
| $(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) -fverbose-asm -S -o $@ $< |
| |
| $(obj)/%.s: $(src)/%.c FORCE |
| $(call if_changed_dep,cc_s_c) |
| |
| quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@ |
| cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $< |
| |
| $(obj)/%.i: $(src)/%.c FORCE |
| $(call if_changed_dep,cc_i_c) |
| |
| quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ |
| cmd_cc_symtypes_c = \ |
| $(CPP) -D__GENKSYMS__ $(c_flags) $< \ |
| | $(GENKSYMS) -T $@ >/dev/null; \ |
| test -s $@ || rm -f $@ |
| |
| $(obj)/%.symtypes : $(src)/%.c FORCE |
| $(call if_changed_dep,cc_symtypes_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 = \ |
| if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ |
| $(CPP) -D__GENKSYMS__ $(c_flags) $< \ |
| | $(GENKSYMS) $(if $(KBUILD_SYMTYPES), \ |
| -T $(@D)/$(@F:.o=.symtypes)) -a $(ARCH) \ |
| > $(@D)/.tmp_$(@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 |
| |
| define rule_cc_o_c |
| $(call echo-cmd,checksrc) $(cmd_checksrc) \ |
| $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \ |
| $(cmd_modversions) \ |
| scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \ |
| $(dot-target).tmp; \ |
| rm -f $(depfile); \ |
| mv -f $(dot-target).tmp $(dot-target).cmd |
| endef |
| |
| # Built-in and composite module parts |
| $(obj)/%.o: $(src)/%.c 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 FORCE |
| $(call cmd,force_checksrc) |
| $(call if_changed_rule,cc_o_c) |
| @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@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 := $(AFLAGS_KERNEL) |
| |
| $(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE) |
| $(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE) |
| |
| quiet_cmd_as_s_S = CPP $(quiet_modtag) $@ |
| cmd_as_s_S = $(CPP) $(a_flags) -o $@ $< |
| |
| $(obj)/%.s: $(src)/%.S FORCE |
| $(call if_changed_dep,as_s_S) |
| |
| quiet_cmd_as_o_S = AS $(quiet_modtag) $@ |
| cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< |
| |
| $(obj)/%.o: $(src)/%.S FORCE |
| $(call if_changed_dep,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) -D__ASSEMBLY__ -o $@ $< |
| |
| $(obj)/%.lds: $(src)/%.lds.S FORCE |
| $(call if_changed_dep,cpp_lds_S) |
| |
| # 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 |
| quiet_cmd_link_o_target = LD $@ |
| # If the list of objects to link is empty, just create an empty built-in.o |
| cmd_link_o_target = $(if $(strip $(obj-y)),\ |
| $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^),\ |
| rm -f $@; $(AR) rcs $@) |
| |
| $(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 $@ |
| cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y) |
| |
| $(lib-target): $(lib-y) FORCE |
| $(call if_changed,link_l_target) |
| |
| targets += $(lib-target) |
| 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> |
| link_multi_deps = \ |
| $(filter $(addprefix $(obj)/, \ |
| $($(subst $(obj)/,,$(@:.o=-objs))) \ |
| $($(subst $(obj)/,,$(@:.o=-y)))), $^) |
| |
| quiet_cmd_link_multi-y = LD $@ |
| cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) |
| |
| quiet_cmd_link_multi-m = LD [M] $@ |
| cmd_link_multi-m = $(cmd_link_multi-y) |
| |
| # We would rather have a list of rules like |
| # foo.o: $(foo-objs) |
| # but that's not so easy, so we rather make all composite objects depend |
| # on the set of all their parts |
| $(multi-used-y) : %.o: $(multi-objs-y) FORCE |
| $(call if_changed,link_multi-y) |
| |
| $(multi-used-m) : %.o: $(multi-objs-m) FORCE |
| $(call if_changed,link_multi-m) |
| @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod) |
| |
| targets += $(multi-used-y) $(multi-used-m) |
| |
| |
| # 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. |
| |
| targets := $(wildcard $(sort $(targets))) |
| cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) |
| |
| ifneq ($(cmd_files),) |
| include $(cmd_files) |
| 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) |