net: sock: allow eBPF programs to be attached to sockets
[linux/fpc-iii.git] / scripts / Makefile.build
blob649ce68440331cdd5c5446ac76e01a487d2bcf6a
1 # ==========================================================================
2 # Building
3 # ==========================================================================
5 src := $(obj)
7 PHONY := __build
8 __build:
10 # Init all relevant variables used in kbuild files so
11 # 1) they have correct type
12 # 2) they do not inherit any value from the environment
13 obj-y :=
14 obj-m :=
15 lib-y :=
16 lib-m :=
17 always :=
18 targets :=
19 subdir-y :=
20 subdir-m :=
21 EXTRA_AFLAGS   :=
22 EXTRA_CFLAGS   :=
23 EXTRA_CPPFLAGS :=
24 EXTRA_LDFLAGS  :=
25 asflags-y  :=
26 ccflags-y  :=
27 cppflags-y :=
28 ldflags-y  :=
30 subdir-asflags-y :=
31 subdir-ccflags-y :=
33 # Read auto.conf if it exists, otherwise ignore
34 -include include/config/auto.conf
36 include scripts/Kbuild.include
38 # For backward compatibility check that these variables do not change
39 save-cflags := $(CFLAGS)
41 # The filename Kbuild has precedence over Makefile
42 kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
43 kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
44 include $(kbuild-file)
46 # If the save-* variables changed error out
47 ifeq ($(KBUILD_NOPEDANTIC),)
48         ifneq ("$(save-cflags)","$(CFLAGS)")
49                 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
50         endif
51 endif
53 include scripts/Makefile.lib
55 ifdef host-progs
56 ifneq ($(hostprogs-y),$(host-progs))
57 $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
58 hostprogs-y += $(host-progs)
59 endif
60 endif
62 # Do not include host rules unless needed
63 ifneq ($(hostprogs-y)$(hostprogs-m),)
64 include scripts/Makefile.host
65 endif
67 ifneq ($(KBUILD_SRC),)
68 # Create output directory if not already present
69 _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
71 # Create directories for object files if directory does not exist
72 # Needed when obj-y := dir/file.o syntax is used
73 _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
74 endif
76 ifndef obj
77 $(warning kbuild: Makefile.build is included improperly)
78 endif
80 # ===========================================================================
82 ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
83 lib-target := $(obj)/lib.a
84 endif
86 ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
87 builtin-target := $(obj)/built-in.o
88 endif
90 modorder-target := $(obj)/modules.order
92 # We keep a list of all modules in $(MODVERDIR)
94 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
95          $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
96          $(subdir-ym) $(always)
97         @:
99 # Linus' kernel sanity checking tool
100 ifneq ($(KBUILD_CHECKSRC),0)
101   ifeq ($(KBUILD_CHECKSRC),2)
102     quiet_cmd_force_checksrc = CHECK   $<
103           cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
104   else
105       quiet_cmd_checksrc     = CHECK   $<
106             cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
107   endif
108 endif
110 # Do section mismatch analysis for each module/built-in.o
111 ifdef CONFIG_DEBUG_SECTION_MISMATCH
112   cmd_secanalysis = ; scripts/mod/modpost $@
113 endif
115 # Compile C sources (.c)
116 # ---------------------------------------------------------------------------
118 # Default is built-in, unless we know otherwise
119 modkern_cflags =                                          \
120         $(if $(part-of-module),                           \
121                 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
122                 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
123 quiet_modtag := $(empty)   $(empty)
125 $(real-objs-m)        : part-of-module := y
126 $(real-objs-m:.o=.i)  : part-of-module := y
127 $(real-objs-m:.o=.s)  : part-of-module := y
128 $(real-objs-m:.o=.lst): part-of-module := y
130 $(real-objs-m)        : quiet_modtag := [M]
131 $(real-objs-m:.o=.i)  : quiet_modtag := [M]
132 $(real-objs-m:.o=.s)  : quiet_modtag := [M]
133 $(real-objs-m:.o=.lst): quiet_modtag := [M]
135 $(obj-m)              : quiet_modtag := [M]
137 # Default for not multi-part modules
138 modname = $(basetarget)
140 $(multi-objs-m)         : modname = $(modname-multi)
141 $(multi-objs-m:.o=.i)   : modname = $(modname-multi)
142 $(multi-objs-m:.o=.s)   : modname = $(modname-multi)
143 $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
144 $(multi-objs-y)         : modname = $(modname-multi)
145 $(multi-objs-y:.o=.i)   : modname = $(modname-multi)
146 $(multi-objs-y:.o=.s)   : modname = $(modname-multi)
147 $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
149 quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@
150 cmd_cc_s_c       = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
152 $(obj)/%.s: $(src)/%.c FORCE
153         $(call if_changed_dep,cc_s_c)
155 quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
156 cmd_cc_i_c       = $(CPP) $(c_flags)   -o $@ $<
158 $(obj)/%.i: $(src)/%.c FORCE
159         $(call if_changed_dep,cc_i_c)
161 cmd_gensymtypes =                                                           \
162     $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
163     $(GENKSYMS) $(if $(1), -T $(2))                                         \
164      $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))             \
165      $(if $(KBUILD_PRESERVE),-p)                                            \
166      -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
168 quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
169 cmd_cc_symtypes_c =                                                         \
170     set -e;                                                                 \
171     $(call cmd_gensymtypes,true,$@) >/dev/null;                             \
172     test -s $@ || rm -f $@
174 $(obj)/%.symtypes : $(src)/%.c FORCE
175         $(call cmd,cc_symtypes_c)
177 # C (.c) files
178 # The C file is compiled and updated dependency information is generated.
179 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
181 quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@
183 ifndef CONFIG_MODVERSIONS
184 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
186 else
187 # When module versioning is enabled the following steps are executed:
188 # o compile a .tmp_<file>.o from <file>.c
189 # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
190 #   not export symbols, we just rename .tmp_<file>.o to <file>.o and
191 #   are done.
192 # o otherwise, we calculate symbol versions using the good old
193 #   genksyms on the preprocessed source and postprocess them in a way
194 #   that they are usable as a linker script
195 # o generate <file>.o from .tmp_<file>.o using the linker to
196 #   replace the unresolved symbols __crc_exported_symbol with
197 #   the actual value of the checksum generated by genksyms
199 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
200 cmd_modversions =                                                               \
201         if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then             \
202                 $(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))    \
203                     > $(@D)/.tmp_$(@F:.o=.ver);                                 \
204                                                                                 \
205                 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F)                      \
206                         -T $(@D)/.tmp_$(@F:.o=.ver);                            \
207                 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);                \
208         else                                                                    \
209                 mv -f $(@D)/.tmp_$(@F) $@;                                      \
210         fi;
211 endif
213 ifdef CONFIG_FTRACE_MCOUNT_RECORD
214 ifdef BUILD_C_RECORDMCOUNT
215 ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
216   RECORDMCOUNT_FLAGS = -w
217 endif
218 # Due to recursion, we must skip empty.o.
219 # The empty.o file is created in the make process in order to determine
220 #  the target endianness and word size. It is made before all other C
221 #  files, including recordmcount.
222 sub_cmd_record_mcount =                                 \
223         if [ $(@) != "scripts/mod/empty.o" ]; then      \
224                 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)";   \
225         fi;
226 recordmcount_source := $(srctree)/scripts/recordmcount.c \
227                     $(srctree)/scripts/recordmcount.h
228 else
229 sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
230         "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
231         "$(if $(CONFIG_64BIT),64,32)" \
232         "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
233         "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
234         "$(if $(part-of-module),1,0)" "$(@)";
235 recordmcount_source := $(srctree)/scripts/recordmcount.pl
236 endif
237 cmd_record_mcount =                                             \
238         if [ "$(findstring -pg,$(_c_flags))" = "-pg" ]; then    \
239                 $(sub_cmd_record_mcount)                        \
240         fi;
241 endif
243 define rule_cc_o_c
244         $(call echo-cmd,checksrc) $(cmd_checksrc)                         \
245         $(call echo-cmd,cc_o_c) $(cmd_cc_o_c);                            \
246         $(cmd_modversions)                                                \
247         $(call echo-cmd,record_mcount)                                    \
248         $(cmd_record_mcount)                                              \
249         scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' >    \
250                                                       $(dot-target).tmp;  \
251         rm -f $(depfile);                                                 \
252         mv -f $(dot-target).tmp $(dot-target).cmd
253 endef
255 # Built-in and composite module parts
256 $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
257         $(call cmd,force_checksrc)
258         $(call if_changed_rule,cc_o_c)
260 # Single-part modules are special since we need to mark them in $(MODVERDIR)
262 $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
263         $(call cmd,force_checksrc)
264         $(call if_changed_rule,cc_o_c)
265         @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
267 quiet_cmd_cc_lst_c = MKLST   $@
268       cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
269                      $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
270                                      System.map $(OBJDUMP) > $@
272 $(obj)/%.lst: $(src)/%.c FORCE
273         $(call if_changed_dep,cc_lst_c)
275 # Compile assembler sources (.S)
276 # ---------------------------------------------------------------------------
278 modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
280 $(real-objs-m)      : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
281 $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
283 quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
284 cmd_as_s_S       = $(CPP) $(a_flags)   -o $@ $<
286 $(obj)/%.s: $(src)/%.S FORCE
287         $(call if_changed_dep,as_s_S)
289 quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
290 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
292 $(obj)/%.o: $(src)/%.S FORCE
293         $(call if_changed_dep,as_o_S)
295 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
296 targets += $(extra-y) $(MAKECMDGOALS) $(always)
298 # Linker scripts preprocessor (.lds.S -> .lds)
299 # ---------------------------------------------------------------------------
300 quiet_cmd_cpp_lds_S = LDS     $@
301       cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
302                              -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
304 $(obj)/%.lds: $(src)/%.lds.S FORCE
305         $(call if_changed_dep,cpp_lds_S)
307 # ASN.1 grammar
308 # ---------------------------------------------------------------------------
309 quiet_cmd_asn1_compiler = ASN.1   $@
310       cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
311                                 $(subst .h,.c,$@) $(subst .c,.h,$@)
313 .PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
315 $(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
316         $(call cmd,asn1_compiler)
318 # Build the compiled-in targets
319 # ---------------------------------------------------------------------------
321 # To build objects in subdirs, we need to descend into the directories
322 $(sort $(subdir-obj-y)): $(subdir-ym) ;
325 # Rule to compile a set of .o files into one .o file
327 ifdef builtin-target
328 quiet_cmd_link_o_target = LD      $@
329 # If the list of objects to link is empty, just create an empty built-in.o
330 cmd_link_o_target = $(if $(strip $(obj-y)),\
331                       $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
332                       $(cmd_secanalysis),\
333                       rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)
335 $(builtin-target): $(obj-y) FORCE
336         $(call if_changed,link_o_target)
338 targets += $(builtin-target)
339 endif # builtin-target
342 # Rule to create modules.order file
344 # Create commands to either record .ko file or cat modules.order from
345 # a subdirectory
346 modorder-cmds =                                         \
347         $(foreach m, $(modorder),                       \
348                 $(if $(filter %/modules.order, $m),     \
349                         cat $m;, echo kernel/$m;))
351 $(modorder-target): $(subdir-ym) FORCE
352         $(Q)(cat /dev/null; $(modorder-cmds)) > $@
355 # Rule to compile a set of .o files into one .a file
357 ifdef lib-target
358 quiet_cmd_link_l_target = AR      $@
359 cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
361 $(lib-target): $(lib-y) FORCE
362         $(call if_changed,link_l_target)
364 targets += $(lib-target)
365 endif
368 # Rule to link composite objects
370 #  Composite objects are specified in kbuild makefile as follows:
371 #    <composite-object>-objs := <list of .o files>
372 #  or
373 #    <composite-object>-y    := <list of .o files>
374 link_multi_deps =                     \
375 $(filter $(addprefix $(obj)/,         \
376 $($(subst $(obj)/,,$(@:.o=-objs)))    \
377 $($(subst $(obj)/,,$(@:.o=-y)))), $^)
379 quiet_cmd_link_multi-y = LD      $@
380 cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
382 quiet_cmd_link_multi-m = LD [M]  $@
383 cmd_link_multi-m = $(cmd_link_multi-y)
385 $(multi-used-y): FORCE
386         $(call if_changed,link_multi-y)
387 $(call multi_depend, $(multi-used-y), .o, -objs -y)
389 $(multi-used-m): FORCE
390         $(call if_changed,link_multi-m)
391         @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
392 $(call multi_depend, $(multi-used-m), .o, -objs -y)
394 targets += $(multi-used-y) $(multi-used-m)
397 # Descending
398 # ---------------------------------------------------------------------------
400 PHONY += $(subdir-ym)
401 $(subdir-ym):
402         $(Q)$(MAKE) $(build)=$@
404 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
405 # ---------------------------------------------------------------------------
407 PHONY += FORCE
409 FORCE:
411 # Read all saved command lines and dependencies for the $(targets) we
412 # may be building above, using $(if_changed{,_dep}). As an
413 # optimization, we don't need to read them if the target does not
414 # exist, we will rebuild anyway in that case.
416 targets := $(wildcard $(sort $(targets)))
417 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
419 ifneq ($(cmd_files),)
420   include $(cmd_files)
421 endif
423 # Declare the contents of the .PHONY variable as phony.  We keep that
424 # information in a variable se we can use it in if_changed and friends.
426 .PHONY: $(PHONY)