Root/scripts/Makefile.lib

1# Backward compatibility
2asflags-y += $(EXTRA_AFLAGS)
3ccflags-y += $(EXTRA_CFLAGS)
4cppflags-y += $(EXTRA_CPPFLAGS)
5ldflags-y += $(EXTRA_LDFLAGS)
6
7#
8# flags that take effect in sub directories
9export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
10export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y)
11
12# Figure out what we need to build from the various variables
13# ===========================================================================
14
15# When an object is listed to be built compiled-in and modular,
16# only build the compiled-in version
17
18obj-m := $(filter-out $(obj-y),$(obj-m))
19
20# Libraries are always collected in one lib file.
21# Filter out objects already built-in
22
23lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
24
25
26# Handle objects in subdirs
27# ---------------------------------------------------------------------------
28# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
29# and add the directory to the list of dirs to descend into: $(subdir-y)
30# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
31# and add the directory to the list of dirs to descend into: $(subdir-m)
32
33# Determine modorder.
34# Unfortunately, we don't have information about ordering between -y
35# and -m subdirs. Just put -y's first.
36modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
37
38__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
39subdir-y += $(__subdir-y)
40__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
41subdir-m += $(__subdir-m)
42obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
43obj-m := $(filter-out %/, $(obj-m))
44
45# Subdirectories we need to descend into
46
47subdir-ym := $(sort $(subdir-y) $(subdir-m))
48
49# if $(foo-objs) exists, foo.o is a composite object
50multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
51multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
52multi-used := $(multi-used-y) $(multi-used-m)
53single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
54
55# Build list of the parts of our composite objects, our composite
56# objects depend on those (obviously)
57multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
58multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
59multi-objs := $(multi-objs-y) $(multi-objs-m)
60
61# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
62# tell kbuild to descend
63subdir-obj-y := $(filter %/built-in.o, $(obj-y))
64
65# $(obj-dirs) is a list of directories that contain object files
66obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
67
68# Replace multi-part objects by their individual parts, look at local dir only
69real-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)
70real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
71
72# Add subdir path
73
74extra-y := $(addprefix $(obj)/,$(extra-y))
75always := $(addprefix $(obj)/,$(always))
76targets := $(addprefix $(obj)/,$(targets))
77modorder := $(addprefix $(obj)/,$(modorder))
78obj-y := $(addprefix $(obj)/,$(obj-y))
79obj-m := $(addprefix $(obj)/,$(obj-m))
80lib-y := $(addprefix $(obj)/,$(lib-y))
81subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
82real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
83real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
84single-used-m := $(addprefix $(obj)/,$(single-used-m))
85multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
86multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
87multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
88multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
89subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
90obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
91
92# These flags are needed for modversions and compiling, so we define them here
93# already
94# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
95# end up in (or would, if it gets compiled in)
96# Note: Files that end up in two or more modules are compiled without the
97# KBUILD_MODNAME definition. The reason is that any made-up name would
98# differ in different configs.
99name-fix = $(subst $(comma),_,$(subst -,_,$1))
100basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))"
101modname_flags = $(if $(filter 1,$(words $(modname))),\
102                 -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
103
104orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
105                 $(ccflags-y) $(CFLAGS_$(basetarget).o)
106_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
107_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
108                 $(asflags-y) $(AFLAGS_$(basetarget).o)
109_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
110
111#
112# Enable gcov profiling flags for a file, directory or for all files depending
113# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
114# (in this order)
115#
116ifeq ($(CONFIG_GCOV_KERNEL),y)
117_c_flags += $(if $(patsubst n%,, \
118        $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
119        $(CFLAGS_GCOV))
120endif
121
122ifdef CONFIG_SYMBOL_PREFIX
123_sym_flags = -DSYMBOL_PREFIX=$(patsubst "%",%,$(CONFIG_SYMBOL_PREFIX))
124_cpp_flags += $(_sym_flags)
125_a_flags += $(_sym_flags)
126endif
127
128
129# If building the kernel in a separate objtree expand all occurrences
130# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
131
132ifeq ($(KBUILD_SRC),)
133__c_flags = $(_c_flags)
134__a_flags = $(_a_flags)
135__cpp_flags = $(_cpp_flags)
136else
137
138# -I$(obj) locates generated .h files
139# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
140# and locates generated .h files
141# FIXME: Replace both with specific CFLAGS* statements in the makefiles
142__c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
143__a_flags = $(call flags,_a_flags)
144__cpp_flags = $(call flags,_cpp_flags)
145endif
146
147c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
148         $(__c_flags) $(modkern_cflags) \
149         -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
150
151a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
152         $(__a_flags) $(modkern_aflags)
153
154cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
155         $(__cpp_flags)
156
157ld_flags = $(LDFLAGS) $(ldflags-y)
158
159dtc_cpp_flags = -Wp,-MD,$(depfile) -nostdinc \
160         -I$(srctree)/arch/$(SRCARCH)/boot/dts \
161         -I$(srctree)/arch/$(SRCARCH)/include/dts \
162         -undef -D__DTS__
163
164# Finds the multi-part object the current object will be linked into
165modname-multi = $(sort $(foreach m,$(multi-used),\
166        $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
167
168ifdef REGENERATE_PARSERS
169
170# GPERF
171# ---------------------------------------------------------------------------
172quiet_cmd_gperf = GPERF $@
173      cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
174
175.PRECIOUS: $(src)/%.hash.c_shipped
176$(src)/%.hash.c_shipped: $(src)/%.gperf
177    $(call cmd,gperf)
178
179# LEX
180# ---------------------------------------------------------------------------
181LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
182
183quiet_cmd_flex = LEX $@
184      cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
185
186.PRECIOUS: $(src)/%.lex.c_shipped
187$(src)/%.lex.c_shipped: $(src)/%.l
188    $(call cmd,flex)
189
190# YACC
191# ---------------------------------------------------------------------------
192YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
193
194quiet_cmd_bison = YACC $@
195      cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
196
197.PRECIOUS: $(src)/%.tab.c_shipped
198$(src)/%.tab.c_shipped: $(src)/%.y
199    $(call cmd,bison)
200
201quiet_cmd_bison_h = YACC $@
202      cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
203
204.PRECIOUS: $(src)/%.tab.h_shipped
205$(src)/%.tab.h_shipped: $(src)/%.y
206    $(call cmd,bison_h)
207
208endif
209
210# Shipped files
211# ===========================================================================
212
213quiet_cmd_shipped = SHIPPED $@
214cmd_shipped = cat $< > $@
215
216$(obj)/%: $(src)/%_shipped
217    $(call cmd,shipped)
218
219# Commands useful for building a boot image
220# ===========================================================================
221#
222# Use as following:
223#
224# target: source(s) FORCE
225# $(if_changed,ld/objcopy/gzip)
226#
227# and add target to extra-y so that we know we have to
228# read in the saved command line
229
230# Linking
231# ---------------------------------------------------------------------------
232
233quiet_cmd_ld = LD $@
234cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
235           $(filter-out FORCE,$^) -o $@
236
237# Objcopy
238# ---------------------------------------------------------------------------
239
240quiet_cmd_objcopy = OBJCOPY $@
241cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
242
243# Gzip
244# ---------------------------------------------------------------------------
245
246quiet_cmd_gzip = GZIP $@
247cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
248    (rm -f $@ ; false)
249
250# DTC
251# ---------------------------------------------------------------------------
252
253# Generate an assembly file to wrap the output of the device tree compiler
254quiet_cmd_dt_S_dtb= DTB $@
255cmd_dt_S_dtb= \
256( \
257    echo '\#include <asm-generic/vmlinux.lds.h>'; \
258    echo '.section .dtb.init.rodata,"a"'; \
259    echo '.balign STRUCT_ALIGNMENT'; \
260    echo '.global __dtb_$(*F)_begin'; \
261    echo '__dtb_$(*F)_begin:'; \
262    echo '.incbin "$<" '; \
263    echo '__dtb_$(*F)_end:'; \
264    echo '.global __dtb_$(*F)_end'; \
265    echo '.balign STRUCT_ALIGNMENT'; \
266) > $@
267
268$(obj)/%.dtb.S: $(obj)/%.dtb
269    $(call cmd,dt_S_dtb)
270
271quiet_cmd_dtc = DTC $@
272cmd_dtc = $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 $(DTC_FLAGS) -d $(depfile) $<
273
274$(obj)/%.dtb: $(src)/%.dts FORCE
275    $(call if_changed_dep,dtc)
276
277dtc-tmp = $(subst $(comma),_,$(dot-target).dts)
278
279quiet_cmd_dtc_cpp = DTC+CPP $@
280cmd_dtc_cpp = $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
281    $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 $(DTC_FLAGS) $(dtc-tmp)
282
283$(obj)/%.dtb: $(src)/%.dtsp FORCE
284    $(call if_changed_dep,dtc_cpp)
285
286# Bzip2
287# ---------------------------------------------------------------------------
288
289# Bzip2 and LZMA do not include size in file... so we have to fake that;
290# append the size as a 32-bit littleendian number as gzip does.
291size_append = printf $(shell \
292dec_size=0; \
293for F in $1; do \
294    fsize=$$(stat -c "%s" $$F); \
295    dec_size=$$(expr $$dec_size + $$fsize); \
296done; \
297printf "%08x\n" $$dec_size | \
298    sed 's/\(..\)/\1 /g' | { \
299        read ch0 ch1 ch2 ch3; \
300        for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
301            printf '%s%03o' '\\' $$((0x$$ch)); \
302        done; \
303    } \
304)
305
306quiet_cmd_bzip2 = BZIP2 $@
307cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
308    bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
309    (rm -f $@ ; false)
310
311# Lzma
312# ---------------------------------------------------------------------------
313
314quiet_cmd_lzma = LZMA $@
315cmd_lzma = (cat $(filter-out FORCE,$^) | \
316    lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
317    (rm -f $@ ; false)
318
319quiet_cmd_lzo = LZO $@
320cmd_lzo = (cat $(filter-out FORCE,$^) | \
321    lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
322    (rm -f $@ ; false)
323
324# U-Boot mkimage
325# ---------------------------------------------------------------------------
326
327MKIMAGE := $(srctree)/scripts/mkuboot.sh
328
329# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
330# the number of overrides in arch makefiles
331UIMAGE_ARCH ?= $(SRCARCH)
332UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
333UIMAGE_OPTS-y ?=
334UIMAGE_TYPE ?= kernel
335UIMAGE_LOADADDR ?= arch_must_set_this
336UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
337UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
338UIMAGE_IN ?= $<
339UIMAGE_OUT ?= $@
340
341quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
342      cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
343            -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
344            -T $(UIMAGE_TYPE) \
345            -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
346            -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
347
348# XZ
349# ---------------------------------------------------------------------------
350# Use xzkern to compress the kernel image and xzmisc to compress other things.
351#
352# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
353# of the kernel decompressor. A BCJ filter is used if it is available for
354# the target architecture. xzkern also appends uncompressed size of the data
355# using size_append. The .xz format has the size information available at
356# the end of the file too, but it's in more complex format and it's good to
357# avoid changing the part of the boot code that reads the uncompressed size.
358# Note that the bytes added by size_append will make the xz tool think that
359# the file is corrupt. This is expected.
360#
361# xzmisc doesn't use size_append, so it can be used to create normal .xz
362# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
363# big dictionary would increase the memory usage too much in the multi-call
364# decompression mode. A BCJ filter isn't used either.
365quiet_cmd_xzkern = XZKERN $@
366cmd_xzkern = (cat $(filter-out FORCE,$^) | \
367    sh $(srctree)/scripts/xz_wrap.sh && \
368    $(call size_append, $(filter-out FORCE,$^))) > $@ || \
369    (rm -f $@ ; false)
370
371quiet_cmd_xzmisc = XZMISC $@
372cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
373    xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
374    (rm -f $@ ; false)
375
376# misc stuff
377# ---------------------------------------------------------------------------
378quote:="
379

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