Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | # Figure out what we need to build from the various variables |
| 2 | # =========================================================================== |
| 3 | |
| 4 | # When an object is listed to be built compiled-in and modular, |
| 5 | # only build the compiled-in version |
| 6 | |
| 7 | obj-m := $(filter-out $(obj-y),$(obj-m)) |
| 8 | |
| 9 | # Libraries are always collected in one lib file. |
| 10 | # Filter out objects already built-in |
| 11 | |
| 12 | lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m))) |
| 13 | |
| 14 | |
| 15 | # Handle objects in subdirs |
| 16 | # --------------------------------------------------------------------------- |
| 17 | # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o |
| 18 | # and add the directory to the list of dirs to descend into: $(subdir-y) |
| 19 | # o if we encounter foo/ in $(obj-m), remove it from $(obj-m) |
| 20 | # and add the directory to the list of dirs to descend into: $(subdir-m) |
| 21 | |
| 22 | __subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) |
| 23 | subdir-y += $(__subdir-y) |
| 24 | __subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m))) |
| 25 | subdir-m += $(__subdir-m) |
| 26 | obj-y := $(patsubst %/, %/built-in.o, $(obj-y)) |
| 27 | obj-m := $(filter-out %/, $(obj-m)) |
| 28 | |
| 29 | # Subdirectories we need to descend into |
| 30 | |
| 31 | subdir-ym := $(sort $(subdir-y) $(subdir-m)) |
| 32 | |
| 33 | # if $(foo-objs) exists, foo.o is a composite object |
| 34 | multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) |
| 35 | multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) |
| 36 | multi-used := $(multi-used-y) $(multi-used-m) |
| 37 | single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m))) |
| 38 | |
| 39 | # Build list of the parts of our composite objects, our composite |
| 40 | # objects depend on those (obviously) |
| 41 | multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y))) |
| 42 | multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y))) |
| 43 | multi-objs := $(multi-objs-y) $(multi-objs-m) |
| 44 | |
Sam Ravnborg | f5fb976 | 2007-09-15 08:55:39 +0200 | [diff] [blame] | 45 | # $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to |
| 46 | # tell kbuild to descend |
| 47 | subdir-obj-y := $(filter %/built-in.o, $(obj-y)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | # $(obj-dirs) is a list of directories that contain object files |
| 50 | obj-dirs := $(dir $(multi-objs) $(subdir-obj-y)) |
| 51 | |
| 52 | # Replace multi-part objects by their individual parts, look at local dir only |
| 53 | real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y) |
| 54 | real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) |
| 55 | |
| 56 | # Add subdir path |
| 57 | |
| 58 | extra-y := $(addprefix $(obj)/,$(extra-y)) |
| 59 | always := $(addprefix $(obj)/,$(always)) |
| 60 | targets := $(addprefix $(obj)/,$(targets)) |
| 61 | obj-y := $(addprefix $(obj)/,$(obj-y)) |
| 62 | obj-m := $(addprefix $(obj)/,$(obj-m)) |
| 63 | lib-y := $(addprefix $(obj)/,$(lib-y)) |
| 64 | subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y)) |
| 65 | real-objs-y := $(addprefix $(obj)/,$(real-objs-y)) |
| 66 | real-objs-m := $(addprefix $(obj)/,$(real-objs-m)) |
| 67 | single-used-m := $(addprefix $(obj)/,$(single-used-m)) |
| 68 | multi-used-y := $(addprefix $(obj)/,$(multi-used-y)) |
| 69 | multi-used-m := $(addprefix $(obj)/,$(multi-used-m)) |
| 70 | multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y)) |
| 71 | multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m)) |
| 72 | subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) |
| 73 | obj-dirs := $(addprefix $(obj)/,$(obj-dirs)) |
| 74 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | # These flags are needed for modversions and compiling, so we define them here |
| 76 | # already |
| 77 | # $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will |
| 78 | # end up in (or would, if it gets compiled in) |
| 79 | # Note: It's possible that one object gets potentially linked into more |
| 80 | # than one module. In that case KBUILD_MODNAME will be set to foo_bar, |
| 81 | # where foo and bar are the name of the modules. |
Ustyugov Roman | f83b5e3 | 2005-09-23 08:42:11 +0400 | [diff] [blame] | 82 | name-fix = $(subst $(comma),_,$(subst -,_,$1)) |
Sam Ravnborg | 5e8d780 | 2006-07-01 09:58:02 +0200 | [diff] [blame] | 83 | basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))" |
Ustyugov Roman | f83b5e3 | 2005-09-23 08:42:11 +0400 | [diff] [blame] | 84 | modname_flags = $(if $(filter 1,$(words $(modname))),\ |
| 85 | -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))") |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
Sam Ravnborg | a0f97e0 | 2007-10-14 22:21:35 +0200 | [diff] [blame] | 87 | _c_flags = $(KBUILD_CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$(basetarget).o) |
Sam Ravnborg | 5e8d780 | 2006-07-01 09:58:02 +0200 | [diff] [blame] | 88 | _a_flags = $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | _cpp_flags = $(CPPFLAGS) $(EXTRA_CPPFLAGS) $(CPPFLAGS_$(@F)) |
| 90 | |
| 91 | # If building the kernel in a separate objtree expand all occurrences |
| 92 | # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/'). |
| 93 | |
| 94 | ifeq ($(KBUILD_SRC),) |
| 95 | __c_flags = $(_c_flags) |
| 96 | __a_flags = $(_a_flags) |
| 97 | __cpp_flags = $(_cpp_flags) |
| 98 | else |
| 99 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | # -I$(obj) locates generated .h files |
| 101 | # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files |
| 102 | # and locates generated .h files |
| 103 | # FIXME: Replace both with specific CFLAGS* statements in the makefiles |
| 104 | __c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags) |
| 105 | __a_flags = $(call flags,_a_flags) |
| 106 | __cpp_flags = $(call flags,_cpp_flags) |
| 107 | endif |
| 108 | |
| 109 | c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \ |
| 110 | $(__c_flags) $(modkern_cflags) \ |
Ustyugov Roman | f83b5e3 | 2005-09-23 08:42:11 +0400 | [diff] [blame] | 111 | -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
| 113 | a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \ |
| 114 | $(__a_flags) $(modkern_aflags) |
| 115 | |
| 116 | cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(__cpp_flags) |
| 117 | |
| 118 | ld_flags = $(LDFLAGS) $(EXTRA_LDFLAGS) |
| 119 | |
| 120 | # Finds the multi-part object the current object will be linked into |
| 121 | modname-multi = $(sort $(foreach m,$(multi-used),\ |
| 122 | $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=)))) |
| 123 | |
| 124 | # Shipped files |
| 125 | # =========================================================================== |
| 126 | |
| 127 | quiet_cmd_shipped = SHIPPED $@ |
| 128 | cmd_shipped = cat $< > $@ |
| 129 | |
| 130 | $(obj)/%:: $(src)/%_shipped |
| 131 | $(call cmd,shipped) |
| 132 | |
| 133 | # Commands useful for building a boot image |
| 134 | # =========================================================================== |
| 135 | # |
| 136 | # Use as following: |
| 137 | # |
| 138 | # target: source(s) FORCE |
| 139 | # $(if_changed,ld/objcopy/gzip) |
| 140 | # |
Sam Ravnborg | 836caba | 2007-09-30 20:34:36 +0200 | [diff] [blame] | 141 | # and add target to extra-y so that we know we have to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | # read in the saved command line |
| 143 | |
| 144 | # Linking |
| 145 | # --------------------------------------------------------------------------- |
| 146 | |
| 147 | quiet_cmd_ld = LD $@ |
| 148 | cmd_ld = $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) $(LDFLAGS_$(@F)) \ |
| 149 | $(filter-out FORCE,$^) -o $@ |
| 150 | |
| 151 | # Objcopy |
| 152 | # --------------------------------------------------------------------------- |
| 153 | |
| 154 | quiet_cmd_objcopy = OBJCOPY $@ |
| 155 | cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ |
| 156 | |
| 157 | # Gzip |
| 158 | # --------------------------------------------------------------------------- |
| 159 | |
| 160 | quiet_cmd_gzip = GZIP $@ |
| 161 | cmd_gzip = gzip -f -9 < $< > $@ |
| 162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |