FreeBSD/Linux Kernel Cross Reference
sys/scripts/Makefile.build

     # ==========================================================================
     # 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
    
    #
    # make W=... settings
    #
    # W=1 - warnings that may be relevant and does not occur too often
    # W=2 - warnings that occur quite often but may still be relevant
    # W=3 - the more obscure warnings, can most likely be ignored
    #
    # $(call cc-option, -W...) handles gcc -W.. options which
    # are not supported by all versions of the compiler
    ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
    warning-  := $(empty)
    
    warning-1 := -Wextra -Wunused -Wno-unused-parameter
    warning-1 += -Wmissing-declarations
    warning-1 += -Wmissing-format-attribute
    warning-1 += -Wmissing-prototypes
    warning-1 += -Wold-style-definition
    warning-1 += $(call cc-option, -Wmissing-include-dirs)
    warning-1 += $(call cc-option, -Wunused-but-set-variable)
    warning-1 += $(call cc-disable-warning, missing-field-initializers)
    
    warning-2 := -Waggregate-return
    warning-2 += -Wcast-align
    warning-2 += -Wdisabled-optimization
    warning-2 += -Wnested-externs
    warning-2 += -Wshadow
    warning-2 += $(call cc-option, -Wlogical-op)
    warning-2 += $(call cc-option, -Wmissing-field-initializers)
    
    warning-3 := -Wbad-function-cast
    warning-3 += -Wcast-qual
    warning-3 += -Wconversion
    warning-3 += -Wpacked
    warning-3 += -Wpadded
    warning-3 += -Wpointer-arith
    warning-3 += -Wredundant-decls
    warning-3 += -Wswitch-default
    warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
    warning-3 += $(call cc-option, -Wvla)
    
    warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
    warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
    warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
    
    ifeq ("$(strip $(warning))","")
            $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
    endif
   
   KBUILD_CFLAGS += $(warning)
   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),)
   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-) $(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) -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)
   
   cmd_gensymtypes =                                                           \
       $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
       $(GENKSYMS) $(if $(1), -T $(2)) -a $(ARCH)                              \
        $(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;                                                                 \
       $(call cmd_gensymtypes,true,$@) >/dev/null;                             \
       test -s $@ || rm -f $@
   
   $(obj)/%.symtypes : $(src)/%.c FORCE
           $(call cmd,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             \
                   $(call cmd_gensymtypes,$(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 := $(srctree)/scripts/recordmcount.pl
   endif
   cmd_record_mcount =                                             \
           if [ "$(findstring -pg,$(_c_flags))" = "-pg" ]; then    \
                   $(sub_cmd_record_mcount)                        \
           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)                                                \
           $(call echo-cmd,record_mcount)                                    \
           $(cmd_record_mcount)                                              \
           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 $(recordmcount_source) 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) 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 := $(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)
   
   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) $(cpp_flags) -P -C -U$(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
   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), $^) \
                         $(cmd_secanalysis),\
                         rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)
   
   $(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 $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(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) $(cmd_secanalysis)
   
   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)

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