blob: 3e54ea712f065d17f0ea56b5131bf0d26fe9a482
1 | # Backward compatibility - to be removed... |
2 | extra-y += $(EXTRA_TARGETS) |
3 | # Figure out what we need to build from the various variables |
4 | # =========================================================================== |
5 | |
6 | # When an object is listed to be built compiled-in and modular, |
7 | # only build the compiled-in version |
8 | |
9 | obj-m := $(filter-out $(obj-y),$(obj-m)) |
10 | |
11 | # Libraries are always collected in one lib file. |
12 | # Filter out objects already built-in |
13 | |
14 | lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m))) |
15 | |
16 | |
17 | # Handle objects in subdirs |
18 | # --------------------------------------------------------------------------- |
19 | # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o |
20 | # and add the directory to the list of dirs to descend into: $(subdir-y) |
21 | # o if we encounter foo/ in $(obj-m), remove it from $(obj-m) |
22 | # and add the directory to the list of dirs to descend into: $(subdir-m) |
23 | |
24 | __subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) |
25 | subdir-y += $(__subdir-y) |
26 | __subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m))) |
27 | subdir-m += $(__subdir-m) |
28 | obj-y := $(patsubst %/, %/built-in.o, $(obj-y)) |
29 | obj-m := $(filter-out %/, $(obj-m)) |
30 | |
31 | # Subdirectories we need to descend into |
32 | |
33 | subdir-ym := $(sort $(subdir-y) $(subdir-m)) |
34 | |
35 | # if $(foo-objs) exists, foo.o is a composite object |
36 | multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) |
37 | multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) |
38 | multi-used := $(multi-used-y) $(multi-used-m) |
39 | single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m))) |
40 | |
41 | # Build list of the parts of our composite objects, our composite |
42 | # objects depend on those (obviously) |
43 | multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y))) |
44 | multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y))) |
45 | multi-objs := $(multi-objs-y) $(multi-objs-m) |
46 | |
47 | # $(subdir-obj-y) is the list of objects in $(obj-y) which do not live |
48 | # in the local directory |
49 | subdir-obj-y := $(foreach o,$(obj-y),$(if $(filter-out $(o),$(notdir $(o))),$(o))) |
50 | |
51 | # $(obj-dirs) is a list of directories that contain object files |
52 | obj-dirs := $(dir $(multi-objs) $(subdir-obj-y)) |
53 | |
54 | # Replace multi-part objects by their individual parts, look at local dir only |
55 | 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) |
56 | real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) |
57 | |
58 | # Add subdir path |
59 | |
60 | extra-y := $(addprefix $(obj)/,$(extra-y)) |
61 | always := $(addprefix $(obj)/,$(always)) |
62 | targets := $(addprefix $(obj)/,$(targets)) |
63 | obj-y := $(addprefix $(obj)/,$(obj-y)) |
64 | obj-m := $(addprefix $(obj)/,$(obj-m)) |
65 | lib-y := $(addprefix $(obj)/,$(lib-y)) |
66 | subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y)) |
67 | real-objs-y := $(addprefix $(obj)/,$(real-objs-y)) |
68 | real-objs-m := $(addprefix $(obj)/,$(real-objs-m)) |
69 | single-used-m := $(addprefix $(obj)/,$(single-used-m)) |
70 | multi-used-y := $(addprefix $(obj)/,$(multi-used-y)) |
71 | multi-used-m := $(addprefix $(obj)/,$(multi-used-m)) |
72 | multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y)) |
73 | multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m)) |
74 | subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) |
75 | obj-dirs := $(addprefix $(obj)/,$(obj-dirs)) |
76 | |
77 | # These flags are needed for modversions and compiling, so we define them here |
78 | # already |
79 | # $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will |
80 | # end up in (or would, if it gets compiled in) |
81 | # Note: It's possible that one object gets potentially linked into more |
82 | # than one module. In that case KBUILD_MODNAME will be set to foo_bar, |
83 | # where foo and bar are the name of the modules. |
84 | name-fix = $(subst $(comma),_,$(subst -,_,$1)) |
85 | basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(*F)))" |
86 | modname_flags = $(if $(filter 1,$(words $(modname))),\ |
87 | -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))") |
88 | |
89 | _c_flags = $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$(*F).o) |
90 | _a_flags = $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o) |
91 | _cpp_flags = $(CPPFLAGS) $(EXTRA_CPPFLAGS) $(CPPFLAGS_$(@F)) |
92 | |
93 | # If building the kernel in a separate objtree expand all occurrences |
94 | # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/'). |
95 | |
96 | ifeq ($(KBUILD_SRC),) |
97 | __c_flags = $(_c_flags) |
98 | __a_flags = $(_a_flags) |
99 | __cpp_flags = $(_cpp_flags) |
100 | else |
101 | |
102 | # -I$(obj) locates generated .h files |
103 | # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files |
104 | # and locates generated .h files |
105 | # FIXME: Replace both with specific CFLAGS* statements in the makefiles |
106 | __c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags) |
107 | __a_flags = $(call flags,_a_flags) |
108 | __cpp_flags = $(call flags,_cpp_flags) |
109 | endif |
110 | |
111 | c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \ |
112 | $(__c_flags) $(modkern_cflags) \ |
113 | -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) |
114 | |
115 | a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \ |
116 | $(__a_flags) $(modkern_aflags) |
117 | |
118 | cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(__cpp_flags) |
119 | |
120 | # Seems to be a wrong thing to do. LDFLAGS contains gcc's flags, |
121 | # yet ld_flags is fed to ld. |
122 | #ld_flags = $(LDFLAGS) $(EXTRA_LDFLAGS) |
123 | # Remove the -Wl, prefix from linker options normally passed through gcc |
124 | ld_flags = $(filter-out -Wl$(comma)%,$(LDFLAGS) $(EXTRA_LDFLAGS)) |
125 | |
126 | |
127 | # Finds the multi-part object the current object will be linked into |
128 | modname-multi = $(sort $(foreach m,$(multi-used),\ |
129 | $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=)))) |
130 | |
131 | # Shipped files |
132 | # =========================================================================== |
133 | |
134 | quiet_cmd_shipped = SHIPPED $@ |
135 | cmd_shipped = cat $< > $@ |
136 | |
137 | $(obj)/%:: $(src)/%_shipped |
138 | $(call cmd,shipped) |
139 | |
140 | # Commands useful for building a boot image |
141 | # =========================================================================== |
142 | # |
143 | # Use as following: |
144 | # |
145 | # target: source(s) FORCE |
146 | # $(if_changed,ld/objcopy/gzip) |
147 | # |
148 | # and add target to EXTRA_TARGETS so that we know we have to |
149 | # read in the saved command line |
150 | |
151 | # Linking |
152 | # --------------------------------------------------------------------------- |
153 | |
154 | # TODO: LDFLAGS usually is supposed to contain gcc's flags, not ld's. |
155 | # but here we feed them to ld! |
156 | quiet_cmd_ld = LD $@ |
157 | cmd_ld = $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) $(LDFLAGS_$(@F)) \ |
158 | $(filter-out FORCE,$^) -o $@ |
159 | |
160 | # Objcopy |
161 | # --------------------------------------------------------------------------- |
162 | |
163 | quiet_cmd_objcopy = OBJCOPY $@ |
164 | cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ |
165 | |
166 | # Gzip |
167 | # --------------------------------------------------------------------------- |
168 | |
169 | quiet_cmd_gzip = GZIP $@ |
170 | cmd_gzip = gzip -f -9 < $< > $@ |
171 |