source: branches/2.2.9/mindi-busybox/scripts/Makefile.build

Last change on this file was 3320, checked in by Bruno Cornec, 6 years ago
  • Re-add (thanks git BTW) the 2.2.9 branch which had been destroyed in the move to 3.0
File size: 10.2 KB
Line 
1# ==========================================================================
2# Building
3# ==========================================================================
4
5src := $(obj)
6
7PHONY := __build
8__build:
9
10# Read .config if it exist, otherwise ignore
11-include .config
12
13include scripts/Kbuild.include
14
15# The filename Kbuild has precedence over Makefile
16# bbox: we also try to include Kbuild file in obj tree first
17kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
18include $(if $(wildcard $(src)/Kbuild), $(src)/Kbuild, \
19        $(if $(wildcard $(kbuild-dir)/Kbuild), $(kbuild-dir)/Kbuild, \
20            $(kbuild-dir)/Makefile \
21        ) \
22    )
23
24include scripts/Makefile.lib
25
26ifdef host-progs
27ifneq ($(hostprogs-y),$(host-progs))
28$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
29hostprogs-y += $(host-progs)
30endif
31endif
32
33# Do not include host rules unles needed
34ifneq ($(hostprogs-y)$(hostprogs-m),)
35include scripts/Makefile.host
36endif
37
38ifneq ($(KBUILD_SRC),)
39# Create output directory if not already present
40_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
41
42# Create directories for object files if directory does not exist
43# Needed when obj-y := dir/file.o syntax is used
44_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
45endif
46
47
48ifdef EXTRA_TARGETS
49$(warning kbuild: $(obj)/Makefile - Usage of EXTRA_TARGETS is obsolete in 2.6. Please fix!)
50endif
51
52ifdef build-targets
53$(warning kbuild: $(obj)/Makefile - Usage of build-targets is obsolete in 2.6. Please fix!)
54endif
55
56ifdef export-objs
57$(warning kbuild: $(obj)/Makefile - Usage of export-objs is obsolete in 2.6. Please fix!)
58endif
59
60ifdef O_TARGET
61$(warning kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.6. Please fix!)
62endif
63
64ifdef L_TARGET
65$(error kbuild: $(obj)/Makefile - Use of L_TARGET is replaced by lib-y in 2.6. Please fix!)
66endif
67
68ifdef list-multi
69$(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.6. Please fix!)
70endif
71
72ifndef obj
73$(warning kbuild: Makefile.build is included improperly)
74endif
75
76# ===========================================================================
77
78ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
79lib-target := $(obj)/lib.a
80endif
81
82ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),)
83builtin-target := $(obj)/built-in.o
84endif
85
86# We keep a list of all modules in $(MODVERDIR)
87
88__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
89     $(if $(KBUILD_MODULES),$(obj-m)) \
90     $(subdir-ym) $(always)
91    @:
92
93# Linus' kernel sanity checking tool
94ifneq ($(KBUILD_CHECKSRC),0)
95  ifeq ($(KBUILD_CHECKSRC),2)
96    quiet_cmd_force_checksrc = CHECK   $<
97          cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
98  else
99      quiet_cmd_checksrc     = CHECK   $<
100            cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
101  endif
102endif
103
104
105# Compile C sources (.c)
106# ---------------------------------------------------------------------------
107
108# Default is built-in, unless we know otherwise
109modkern_cflags := $(CFLAGS_KERNEL)
110quiet_modtag := $(empty)   $(empty)
111
112$(real-objs-m)        : modkern_cflags := $(CFLAGS_MODULE)
113$(real-objs-m:.o=.i)  : modkern_cflags := $(CFLAGS_MODULE)
114$(real-objs-m:.o=.s)  : modkern_cflags := $(CFLAGS_MODULE)
115$(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE)
116
117$(real-objs-m)        : quiet_modtag := [M]
118$(real-objs-m:.o=.i)  : quiet_modtag := [M]
119$(real-objs-m:.o=.s)  : quiet_modtag := [M]
120$(real-objs-m:.o=.lst): quiet_modtag := [M]
121
122$(obj-m)              : quiet_modtag := [M]
123
124# Default for not multi-part modules
125modname = $(*F)
126
127$(multi-objs-m)         : modname = $(modname-multi)
128$(multi-objs-m:.o=.i)   : modname = $(modname-multi)
129$(multi-objs-m:.o=.s)   : modname = $(modname-multi)
130$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
131$(multi-objs-y)         : modname = $(modname-multi)
132$(multi-objs-y:.o=.i)   : modname = $(modname-multi)
133$(multi-objs-y:.o=.s)   : modname = $(modname-multi)
134$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
135
136quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@
137cmd_cc_s_c       = $(CC) $(c_flags) -fverbose-asm -S -o $@ $<
138
139%.s: %.c FORCE
140    $(call if_changed_dep,cc_s_c)
141
142quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
143cmd_cc_i_c       = $(CPP) $(c_flags)   -o $@ $<
144
145%.i: %.c FORCE
146    $(call if_changed_dep,cc_i_c)
147
148# C (.c) files
149# The C file is compiled and updated dependency information is generated.
150# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
151
152quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@
153
154ifndef CONFIG_MODVERSIONS
155cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
156
157else
158# When module versioning is enabled the following steps are executed:
159# o compile a .tmp_<file>.o from <file>.c
160# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
161#   not export symbols, we just rename .tmp_<file>.o to <file>.o and
162#   are done.
163# o otherwise, we calculate symbol versions using the good old
164#   genksyms on the preprocessed source and postprocess them in a way
165#   that they are usable as a linker script
166# o generate <file>.o from .tmp_<file>.o using the linker to
167#   replace the unresolved symbols __crc_exported_symbol with
168#   the actual value of the checksum generated by genksyms
169
170cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
171cmd_modversions =                           \
172    if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
173        $(CPP) -D__GENKSYMS__ $(c_flags) $<         \
174        | $(GENKSYMS) -a $(ARCH)                \
175        > $(@D)/.tmp_$(@F:.o=.ver);             \
176                                    \
177        $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F)      \
178            -T $(@D)/.tmp_$(@F:.o=.ver);            \
179        rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);    \
180    else                                \
181        mv -f $(@D)/.tmp_$(@F) $@;              \
182    fi;
183endif
184
185define rule_cc_o_c
186    $(call echo-cmd,checksrc) $(cmd_checksrc)             \
187    $(call echo-cmd,cc_o_c) $(cmd_cc_o_c);                \
188    $(cmd_modversions)                        \
189    scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > $(@D)/.$(@F).tmp;  \
190    rm -f $(depfile);                         \
191    mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd
192endef
193
194# Built-in and composite module parts
195
196%.o: %.c FORCE
197    $(call cmd,force_checksrc)
198    $(call if_changed_rule,cc_o_c)
199
200# Single-part modules are special since we need to mark them in $(MODVERDIR)
201
202$(single-used-m): %.o: %.c FORCE
203    $(call cmd,force_checksrc)
204    $(call if_changed_rule,cc_o_c)
205    @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
206
207quiet_cmd_cc_lst_c = MKLST   $@
208      cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
209             $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
210                     System.map $(OBJDUMP) > $@
211
212%.lst: %.c FORCE
213    $(call if_changed_dep,cc_lst_c)
214
215# Compile assembler sources (.S)
216# ---------------------------------------------------------------------------
217
218modkern_aflags := $(AFLAGS_KERNEL)
219
220$(real-objs-m)      : modkern_aflags := $(AFLAGS_MODULE)
221$(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)
222
223quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
224cmd_as_s_S       = $(CPP) $(a_flags)   -o $@ $<
225
226%.s: %.S FORCE
227    $(call if_changed_dep,as_s_S)
228
229quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
230cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
231
232%.o: %.S FORCE
233    $(call if_changed_dep,as_o_S)
234
235targets += $(real-objs-y) $(real-objs-m) $(lib-y)
236targets += $(extra-y) $(MAKECMDGOALS) $(always)
237
238# Linker scripts preprocessor (.lds.S -> .lds)
239# ---------------------------------------------------------------------------
240quiet_cmd_cpp_lds_S = LDS     $@
241      cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $<
242
243%.lds: %.lds.S FORCE
244    $(call if_changed_dep,cpp_lds_S)
245
246# Build the compiled-in targets
247# ---------------------------------------------------------------------------
248
249# To build objects in subdirs, we need to descend into the directories
250$(sort $(subdir-obj-y)): $(subdir-ym) ;
251
252#
253# Rule to compile a set of .o files into one .o file
254#
255ifdef builtin-target
256quiet_cmd_link_o_target = LD      $@
257# If the list of objects to link is empty, just create an empty built-in.o
258cmd_link_o_target = $(if $(strip $(obj-y)),\
259        $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^),\
260        rm -f $@; $(AR) rcs $@)
261
262$(builtin-target): $(obj-y) FORCE
263    $(call if_changed,link_o_target)
264
265targets += $(builtin-target)
266endif # builtin-target
267
268#
269# Rule to compile a set of .o files into one .a file
270#
271ifdef lib-target
272quiet_cmd_link_l_target = AR      $@
273cmd_link_l_target = rm -f $@; $(AR) $(EXTRA_ARFLAGS) rcs $@ $(lib-y)
274
275$(lib-target): $(lib-y) FORCE
276    $(call if_changed,link_l_target)
277
278targets += $(lib-target)
279endif
280
281#
282# Rule to link composite objects
283#
284#  Composite objects are specified in kbuild makefile as follows:
285#    <composite-object>-objs := <list of .o files>
286#  or
287#    <composite-object>-y    := <list of .o files>
288link_multi_deps =                     \
289$(filter $(addprefix $(obj)/,         \
290$($(subst $(obj)/,,$(@:.o=-objs)))    \
291$($(subst $(obj)/,,$(@:.o=-y)))), $^)
292
293quiet_cmd_link_multi-y = LD      $@
294cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps)
295
296quiet_cmd_link_multi-m = LD [M]  $@
297cmd_link_multi-m = $(LD) $(ld_flags) $(LDFLAGS_MODULE) -o $@ $(link_multi_deps)
298
299# We would rather have a list of rules like
300#   foo.o: $(foo-objs)
301# but that's not so easy, so we rather make all composite objects depend
302# on the set of all their parts
303$(multi-used-y) : %.o: $(multi-objs-y) FORCE
304    $(call if_changed,link_multi-y)
305
306$(multi-used-m) : %.o: $(multi-objs-m) FORCE
307    $(call if_changed,link_multi-m)
308    @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
309
310targets += $(multi-used-y) $(multi-used-m)
311
312
313# Descending
314# ---------------------------------------------------------------------------
315
316PHONY += $(subdir-ym)
317$(subdir-ym):
318    $(Q)$(MAKE) $(build)=$@
319
320# Add FORCE to the prequisites of a target to force it to be always rebuilt.
321# ---------------------------------------------------------------------------
322
323PHONY += FORCE
324
325FORCE:
326
327# Read all saved command lines and dependencies for the $(targets) we
328# may be building above, using $(if_changed{,_dep}). As an
329# optimization, we don't need to read them if the target does not
330# exist, we will rebuild anyway in that case.
331
332targets := $(wildcard $(sort $(targets)))
333cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
334
335ifneq ($(cmd_files),)
336  include $(cmd_files)
337endif
338
339
340# Declare the contents of the .PHONY variable as phony.  We keep that
341# information in a variable se we can use it in if_changed and friends.
342
343.PHONY: $(PHONY)
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