# ========================================================================== # Building # ========================================================================== src := $(obj) .PHONY: __build __build: ifdef include_config include .config endif include $(obj)/Makefile include scripts/Makefile.lib ifdef O_TARGET $(error kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.5. Please fix!) endif ifdef L_TARGET ifneq ($(L_TARGET),lib.a) $(warning kbuild: $(obj)/Makefile - L_TARGET := $(L_TARGET) target shall be renamed to lib.a. Please fix!) endif endif ifdef list-multi $(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.5. Please fix!) endif ifndef obj $(warning kbuild: Makefile.build is included improperly) endif # =========================================================================== # If a Makefile does not define a L_TARGET, link an object called "built-in.o" ifdef L_TARGET L_TARGET := $(obj)/$(L_TARGET) else ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-)),) O_TARGET := $(obj)/built-in.o endif endif __build: $(if $(KBUILD_BUILTIN),$(O_TARGET) $(L_TARGET) $(EXTRA_TARGETS)) \ $(if $(KBUILD_MODULES),$(obj-m:.o=.ko)) \ $(subdir-ym) $(build-targets) @: # 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] $(export-objs) : export_flags := $(EXPORT_FLAGS) $(export-objs:.o=.i) : export_flags := $(EXPORT_FLAGS) $(export-objs:.o=.s) : export_flags := $(EXPORT_FLAGS) $(export-objs:.o=.lst): export_flags := $(EXPORT_FLAGS) # Default for not multi-part modules modname = $(*F) $(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) -S -o $@ $< %.s: %.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 $@ $< %.i: %.c FORCE $(call if_changed_dep,cc_i_c) quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< %.o: %.c FORCE $(call if_changed_dep,cc_o_c) 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) > $@ %.lst: %.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 $@ $< %.s: %.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 $@ $< %.o: %.S FORCE $(call if_changed_dep,as_o_S) targets += $(real-objs-y) $(real-objs-m) $(EXTRA_TARGETS) $(MAKECMDGOALS) # 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 O_TARGET quiet_cmd_link_o_target = LD $@ # If the list of objects to link is empty, just create an empty O_TARGET cmd_link_o_target = $(if $(strip $(obj-y)),\ $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) -r -o $@ $(filter $(obj-y), $^),\ rm -f $@; $(AR) rcs $@) $(O_TARGET): $(obj-y) FORCE $(call if_changed,link_o_target) targets += $(O_TARGET) endif # O_TARGET # # Rule to compile a set of .o files into one .a file # ifdef L_TARGET quiet_cmd_link_l_target = AR $@ cmd_link_l_target = rm -f $@; $(AR) $(EXTRA_ARFLAGS) rcs $@ $(obj-y) $(L_TARGET): $(obj-y) FORCE $(call if_changed,link_l_target) targets += $(L_TARGET) endif # # Rule to link composite objects # quiet_cmd_link_multi-y = LD $@ cmd_link_multi-y = $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) -r -o $@ $(filter $(addprefix $(obj)/,$($(subst $(obj)/,,$(@:.o=-objs))) $($(subst $(obj)/,,$(@:.o=-y)))),$^) quiet_cmd_link_multi-m = LD [M] $@ cmd_link_multi-m = $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) $(LDFLAGS_MODULE) -o $@ $(filter $(addprefix $(obj)/,$($(subst $(obj)/,,$(@:.ko=-objs))) $($(subst $(obj)/,,$(@:.ko=-y)))),$^) init/vermagic.o quiet_cmd_link_single-m = LD [M] $@ cmd_link_single-m = $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) $(LDFLAGS_MODULE) -o $@ $< init/vermagic.o # Don't rebuilt vermagic.o unless we actually are in the init/ dir ifneq ($(obj),init) init/vermagic.o: ; endif # 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=.ko) : %.ko: $(multi-objs-m) init/vermagic.o FORCE $(call if_changed,link_multi-m) $(single-used-m:.o=.ko) : %.ko: %.o init/vermagic.o FORCE $(call if_changed,link_single-m) targets += $(multi-used-y) $(multi-used-m:.o=.ko) $(single-used-m:.o=.ko) # Compile programs on the host # =========================================================================== # host-progs := bin2hex # Will compile bin2hex.c and create an executable named bin2hex # # host-progs := lxdialog # lxdialog-objs := checklist.o lxdialog.o # Will compile lxdialog.c and checklist.c, and then link the executable # lxdialog, based on checklist.o and lxdialog.o # # host-progs := qconf # qconf-cxxobjs := qconf.o # qconf-objs := menu.o # Will compile qconf as a C++ program, and menu as a C program. # They are linked as C++ code to the executable qconf # host-progs := conf # conf-objs := conf.o libkconfig.so # libkconfig-objs := expr.o type.o # Will create a shared library named libkconfig.so that consist of # expr.o and type.o (they are both compiled as C code and the object file # are made as position independent code). # conf.c is compiled as a c program, and conf.o is linked together with # libkconfig.so as the executable conf. # Note: Shared libraries consisting of C++ files are not supported # # Create executable from a single .c file # host-csingle -> Executable quiet_cmd_host-csingle = HOSTCC $@ cmd_host-csingle = $(HOSTCC) $(hostc_flags) $(HOST_LOADLIBES) -o $@ $< $(host-csingle): %: %.c FORCE $(call if_changed_dep,host-csingle) # Link an executable based on list of .o files, all plain c # host-cmulti -> executable quiet_cmd_host-cmulti = HOSTLD $@ cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \ $(addprefix $(obj)/,$($(@F)-objs)) \ $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) $(host-cmulti): %: $(host-cobjs) $(host-cshlib) FORCE $(call if_changed,host-cmulti) # Create .o file from a single .c file # host-cobjs -> .o quiet_cmd_host-cobjs = HOSTCC $@ cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $< $(host-cobjs): %.o: %.c FORCE $(call if_changed_dep,host-cobjs) # Link an executable based on list of .o files, a mixture of .c and .cc # host-cxxmulti -> executable quiet_cmd_host-cxxmulti = HOSTLD $@ cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \ $(foreach o,objs cxxobjs,\ $(addprefix $(obj)/,$($(@F)-$(o)))) \ $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) $(host-cxxmulti): %: $(host-cobjs) $(host-cxxobjs) $(host-cshlib) FORCE $(call if_changed,host-cxxmulti) # Create .o file from a single .cc (C++) file quiet_cmd_host-cxxobjs = HOSTCXX $@ cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $< $(host-cxxobjs): %.o: %.cc FORCE $(call if_changed_dep,host-cxxobjs) # Compile .c file, create position independent .o file # host-cshobjs -> .o quiet_cmd_host-cshobjs = HOSTCC -fPIC $@ cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $< $(host-cshobjs): %.o: %.c FORCE $(call if_changed_dep,host-cshobjs) # Link a shared library, based on position independent .o files # *.o -> .so shared library (host-cshlib) quiet_cmd_host-cshlib = HOSTLLD -shared $@ cmd_host-cshlib = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \ $(addprefix $(obj)/,$($(@F:.so=-objs))) \ $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) $(host-cshlib): %: $(host-cshobjs) FORCE $(call if_changed,host-cshlib) targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\ $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) # 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