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) $(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        $(CFLAGS_GCOV))
120endif
121
122# If building the kernel in a separate objtree expand all occurrences
123# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
124
125ifeq ($(KBUILD_SRC),)
126__c_flags = $(_c_flags)
127__a_flags = $(_a_flags)
128__cpp_flags = $(_cpp_flags)
129else
130
131# -I$(obj) locates generated .h files
132# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
133# and locates generated .h files
134# FIXME: Replace both with specific CFLAGS* statements in the makefiles
135__c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
136__a_flags = $(call flags,_a_flags)
137__cpp_flags = $(call flags,_cpp_flags)
138endif
139
140c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
141         $(__c_flags) $(modkern_cflags) \
142         -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
143
144a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
145         $(__a_flags) $(modkern_aflags)
146
147cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
148         $(__cpp_flags)
149
150ld_flags = $(LDFLAGS) $(ldflags-y)
151
152dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \
153         -I$(srctree)/arch/$(SRCARCH)/boot/dts \
154         -I$(srctree)/arch/$(SRCARCH)/boot/dts/include \
155         -I$(srctree)/drivers/of/testcase-data \
156         -undef -D__DTS__
157
158# Finds the multi-part object the current object will be linked into
159modname-multi = $(sort $(foreach m,$(multi-used),\
160        $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
161
162ifdef REGENERATE_PARSERS
163
164# GPERF
165# ---------------------------------------------------------------------------
166quiet_cmd_gperf = GPERF $@
167      cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
168
169.PRECIOUS: $(src)/%.hash.c_shipped
170$(src)/%.hash.c_shipped: $(src)/%.gperf
171    $(call cmd,gperf)
172
173# LEX
174# ---------------------------------------------------------------------------
175LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
176
177quiet_cmd_flex = LEX $@
178      cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
179
180.PRECIOUS: $(src)/%.lex.c_shipped
181$(src)/%.lex.c_shipped: $(src)/%.l
182    $(call cmd,flex)
183
184# YACC
185# ---------------------------------------------------------------------------
186YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
187
188quiet_cmd_bison = YACC $@
189      cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
190
191.PRECIOUS: $(src)/%.tab.c_shipped
192$(src)/%.tab.c_shipped: $(src)/%.y
193    $(call cmd,bison)
194
195quiet_cmd_bison_h = YACC $@
196      cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
197
198.PRECIOUS: $(src)/%.tab.h_shipped
199$(src)/%.tab.h_shipped: $(src)/%.y
200    $(call cmd,bison_h)
201
202endif
203
204# Shipped files
205# ===========================================================================
206
207quiet_cmd_shipped = SHIPPED $@
208cmd_shipped = cat $< > $@
209
210$(obj)/%: $(src)/%_shipped
211    $(call cmd,shipped)
212
213# Commands useful for building a boot image
214# ===========================================================================
215#
216# Use as following:
217#
218# target: source(s) FORCE
219# $(if_changed,ld/objcopy/gzip)
220#
221# and add target to extra-y so that we know we have to
222# read in the saved command line
223
224# Linking
225# ---------------------------------------------------------------------------
226
227quiet_cmd_ld = LD $@
228cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
229           $(filter-out FORCE,$^) -o $@
230
231# Objcopy
232# ---------------------------------------------------------------------------
233
234quiet_cmd_objcopy = OBJCOPY $@
235cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
236
237# Gzip
238# ---------------------------------------------------------------------------
239
240quiet_cmd_gzip = GZIP $@
241cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
242    (rm -f $@ ; false)
243
244# DTC
245# ---------------------------------------------------------------------------
246
247# Generate an assembly file to wrap the output of the device tree compiler
248quiet_cmd_dt_S_dtb= DTB $@
249cmd_dt_S_dtb= \
250( \
251    echo '\#include <asm-generic/vmlinux.lds.h>'; \
252    echo '.section .dtb.init.rodata,"a"'; \
253    echo '.balign STRUCT_ALIGNMENT'; \
254    echo '.global __dtb_$(*F)_begin'; \
255    echo '__dtb_$(*F)_begin:'; \
256    echo '.incbin "$<" '; \
257    echo '__dtb_$(*F)_end:'; \
258    echo '.global __dtb_$(*F)_end'; \
259    echo '.balign STRUCT_ALIGNMENT'; \
260) > $@
261
262$(obj)/%.dtb.S: $(obj)/%.dtb
263    $(call cmd,dt_S_dtb)
264
265quiet_cmd_dtc = DTC $@
266cmd_dtc = $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
267    $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 \
268        -i $(dir $<) $(DTC_FLAGS) \
269        -d $(depfile).dtc.tmp $(dtc-tmp) ; \
270    cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
271
272$(obj)/%.dtb: $(src)/%.dts FORCE
273    $(call if_changed_dep,dtc)
274
275dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
276
277# Helper targets for Installing DTBs into the boot directory
278quiet_cmd_dtb_install = INSTALL $<
279      cmd_dtb_install = cp $< $(2)
280
281_dtbinst_pre_:
282    $(Q)if [ -d $(INSTALL_DTBS_PATH).old ]; then rm -rf $(INSTALL_DTBS_PATH).old; fi
283    $(Q)if [ -d $(INSTALL_DTBS_PATH) ]; then mv $(INSTALL_DTBS_PATH) $(INSTALL_DTBS_PATH).old; fi
284    $(Q)mkdir -p $(INSTALL_DTBS_PATH)
285
286%.dtb_dtbinst_: $(obj)/%.dtb _dtbinst_pre_
287    $(call cmd,dtb_install,$(INSTALL_DTBS_PATH))
288
289# Bzip2
290# ---------------------------------------------------------------------------
291
292# Bzip2 and LZMA do not include size in file... so we have to fake that;
293# append the size as a 32-bit littleendian number as gzip does.
294size_append = printf $(shell \
295dec_size=0; \
296for F in $1; do \
297    fsize=$$(stat -c "%s" $$F); \
298    dec_size=$$(expr $$dec_size + $$fsize); \
299done; \
300printf "%08x\n" $$dec_size | \
301    sed 's/\(..\)/\1 /g' | { \
302        read ch0 ch1 ch2 ch3; \
303        for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
304            printf '%s%03o' '\\' $$((0x$$ch)); \
305        done; \
306    } \
307)
308
309quiet_cmd_bzip2 = BZIP2 $@
310cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
311    bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
312    (rm -f $@ ; false)
313
314# Lzma
315# ---------------------------------------------------------------------------
316
317quiet_cmd_lzma = LZMA $@
318cmd_lzma = (cat $(filter-out FORCE,$^) | \
319    lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
320    (rm -f $@ ; false)
321
322quiet_cmd_lzo = LZO $@
323cmd_lzo = (cat $(filter-out FORCE,$^) | \
324    lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
325    (rm -f $@ ; false)
326
327quiet_cmd_lz4 = LZ4 $@
328cmd_lz4 = (cat $(filter-out FORCE,$^) | \
329    lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
330    (rm -f $@ ; false)
331
332# U-Boot mkimage
333# ---------------------------------------------------------------------------
334
335MKIMAGE := $(srctree)/scripts/mkuboot.sh
336
337# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
338# the number of overrides in arch makefiles
339UIMAGE_ARCH ?= $(SRCARCH)
340UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
341UIMAGE_OPTS-y ?=
342UIMAGE_TYPE ?= kernel
343UIMAGE_LOADADDR ?= arch_must_set_this
344UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
345UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
346UIMAGE_IN ?= $<
347UIMAGE_OUT ?= $@
348
349quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
350      cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
351            -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
352            -T $(UIMAGE_TYPE) \
353            -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
354            -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
355
356# XZ
357# ---------------------------------------------------------------------------
358# Use xzkern to compress the kernel image and xzmisc to compress other things.
359#
360# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
361# of the kernel decompressor. A BCJ filter is used if it is available for
362# the target architecture. xzkern also appends uncompressed size of the data
363# using size_append. The .xz format has the size information available at
364# the end of the file too, but it's in more complex format and it's good to
365# avoid changing the part of the boot code that reads the uncompressed size.
366# Note that the bytes added by size_append will make the xz tool think that
367# the file is corrupt. This is expected.
368#
369# xzmisc doesn't use size_append, so it can be used to create normal .xz
370# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
371# big dictionary would increase the memory usage too much in the multi-call
372# decompression mode. A BCJ filter isn't used either.
373quiet_cmd_xzkern = XZKERN $@
374cmd_xzkern = (cat $(filter-out FORCE,$^) | \
375    sh $(srctree)/scripts/xz_wrap.sh && \
376    $(call size_append, $(filter-out FORCE,$^))) > $@ || \
377    (rm -f $@ ; false)
378
379quiet_cmd_xzmisc = XZMISC $@
380cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
381    xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
382    (rm -f $@ ; false)
383

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