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8ec4b4f kbuild: introduce Kbuild.include
Sam Ravnborg authored
1 ####
2 # kbuild: Generic definitions
3
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4 # Convenient variables
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5 comma := ,
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6 squote := '
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7 empty :=
8 space := $(empty) $(empty)
9
10 ###
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11 # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
12 dot-target = $(dir $@).$(notdir $@)
13
14 ###
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15 # The temporary file to save gcc -MD generated dependencies must not
16 # contain a comma
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17 depfile = $(subst $(comma),_,$(dot-target).d)
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18
19 ###
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20 # filename of target with directory and extension stripped
21 basetarget = $(basename $(notdir $@))
22
23 ###
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24 # Escape single quote for use in echo statements
25 escsq = $(subst $(squote),'\$(squote)',$1)
26
27 ###
5410ecc @vapier kbuild: introduce $(kecho) convenience echo
vapier authored
28 # Easy method for doing a status message
29 kecho := :
30 quiet_kecho := echo
31 silent_kecho := :
32 kecho := $($(quiet)kecho)
33
34 ###
8ec4b4f kbuild: introduce Kbuild.include
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35 # filechk is used to check if the content of a generated file is updated.
36 # Sample usage:
37 # define filechk_sample
38 # echo $KERNELRELEASE
39 # endef
40 # version.h : Makefile
41 # $(call filechk,sample)
42 # The rule defined shall write to stdout the content of the new file.
43 # The existing file will be compared with the new one.
44 # - If no file exist it is created
45 # - If the content differ the new file is used
46 # - If they are equal no change, and no timestamp update
47 # - stdin is piped in from the first prerequisite ($<) so one has
48 # to specify a valid file as first prerequisite (often the kbuild file)
49 define filechk
50 $(Q)set -e; \
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vapier authored
51 $(kecho) ' CHK $@'; \
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52 mkdir -p $(dir $@); \
53 $(filechk_$(1)) < $< > $@.tmp; \
54 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
55 rm -f $@.tmp; \
56 else \
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57 $(kecho) ' UPD $@'; \
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58 mv -f $@.tmp $@; \
59 fi
60 endef
61
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62 ######
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63 # gcc support functions
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64 # See documentation in Documentation/kbuild/makefiles.txt
65
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66 # cc-cross-prefix
67 # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
68 # Return first prefix where a prefix$(CC) is found in PATH.
69 # If no $(CC) found in PATH with listed prefixes return nothing
70 cc-cross-prefix = \
71 $(word 1, $(foreach c,$(1), \
72 $(shell set -e; \
73 if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
74 echo $(c); \
75 fi)))
76
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77 # output directory for tests below
78 TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
79
80 # try-run
81 # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
82 # Exit code chooses option. "$$TMP" is can be used as temporary file and
83 # is automatically cleaned up.
84 try-run = $(shell set -e; \
85 TMP="$(TMPOUT).$$$$.tmp"; \
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86 TMPO="$(TMPOUT).$$$$.o"; \
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87 if ($(1)) >/dev/null 2>&1; \
88 then echo "$(2)"; \
89 else echo "$(3)"; \
90 fi; \
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91 rm -f "$$TMP" "$$TMPO")
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92
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93 # as-option
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94 # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
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95
96 as-option = $(call try-run,\
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97 $(CC) $(KBUILD_CFLAGS) $(1) -c -xassembler /dev/null -o "$$TMP",$(1),$(2))
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98
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99 # as-instr
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100 # Usage: cflags-y += $(call as-instr,instr,option1,option2)
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101
102 as-instr = $(call try-run,\
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103 /bin/echo -e "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" -,$(2),$(3))
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104
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105 # cc-option
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106 # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
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107
108 cc-option = $(call try-run,\
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109 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",$(1),$(2))
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110
111 # cc-option-yn
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112 # Usage: flag := $(call cc-option-yn,-march=winchip-c6)
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113 cc-option-yn = $(call try-run,\
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114 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",y,n)
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115
116 # cc-option-align
117 # Prefix align with either -falign or -malign
118 cc-option-align = $(subst -functions=0,,\
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119 $(call cc-option,-falign-functions=0,-malign-functions=0))
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120
121 # cc-version
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segher authored
122 # Usage gcc-ver := $(call cc-version)
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123 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
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124
0ab2a27 @segher kbuild: New 'cc-fullversion' macro
segher authored
125 # cc-fullversion
126 # Usage gcc-ver := $(call cc-fullversion)
127 cc-fullversion = $(shell $(CONFIG_SHELL) \
128 $(srctree)/scripts/gcc-version.sh -p $(CC))
129
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130 # cc-ifversion
131 # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
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132 cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3))
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133
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134 # cc-ldoption
135 # Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
136 cc-ldoption = $(call try-run,\
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137 $(CC) $(1) -nostdlib -xc /dev/null -o "$$TMP",$(1),$(2))
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138
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139 # ld-option
140 # Usage: LDFLAGS += $(call ld-option, -X)
141 ld-option = $(call try-run,\
142 $(CC) /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
143
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144 ######
0b0bf7a [PATCH] vDSO hash-style fix
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145
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146 ###
8ec4b4f kbuild: introduce Kbuild.include
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147 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
148 # Usage:
149 # $(Q)$(MAKE) $(build)=dir
150 build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
151
bc081dd @michal42 kbuild: generate modules.builtin
michal42 authored
152 ###
153 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
154 # Usage:
155 # $(Q)$(MAKE) $(modbuiltin)=dir
156 modbuiltin := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.modbuiltin obj
157
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158 # Prefix -I with $(srctree) if it is not an absolute path.
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159 # skip if -I has no parameter
160 addtree = $(if $(patsubst -I%,%,$(1)), \
161 $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1))
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162
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163 # Find all -I options and call addtree
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164 flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
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165
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166 # echo command.
167 # Short version is used, if $(quiet) equals `quiet_', otherwise full one.
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168 echo-cmd = $(if $($(quiet)cmd_$(1)),\
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169 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
170
171 # printing commands
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172 cmd = @$(echo-cmd) $(cmd_$(1))
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173
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174 # Add $(obj)/ for paths that are not absolute
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175 objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
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176
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177 ###
5de043f [PATCH] kbuild: improve option checking, Kbuild.include cleanup
Oleg Verych authored
178 # if_changed - execute command if any prerequisite is newer than
8ec4b4f kbuild: introduce Kbuild.include
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179 # target, or command line has changed
180 # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
181 # including used config symbols
182 # if_changed_rule - as if_changed but execute rule instead
183 # See Documentation/kbuild/makefiles.txt for more info
184
185 ifneq ($(KBUILD_NOCMDDEP),1)
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186 # Check if both arguments has same arguments. Result is empty string if equal.
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187 # User may override this check using make KBUILD_NOCMDDEP=1
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188 arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
189 $(filter-out $(cmd_$@), $(cmd_$(1))) )
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190 endif
191
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192 # >'< substitution is for echo to work,
193 # >$< substitution to preserve $ when reloading .cmd file
194 # note: when using inline perl scripts [perl -e '...$$t=1;...']
195 # in $(cmd_xxx) double $$ your perl vars
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196 make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1)))))
197
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198 # Find any prerequisites that is newer than target or that does not exist.
199 # PHONY targets skipped in both cases.
200 any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
201
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202 # Execute command if command has changed or prerequisite(s) are updated.
4f19336 @madscientist kbuild: change kbuild to not rely on incorrect GNU make behavior
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203 #
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204 if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
205 @set -e; \
206 $(echo-cmd) $(cmd_$(1)); \
207 echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
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208
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209 # Execute the command and also postprocess generated .d dependencies file.
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210 if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
211 @set -e; \
212 $(echo-cmd) $(cmd_$(1)); \
213 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
214 rm -f $(depfile); \
215 mv -f $(dot-target).tmp $(dot-target).cmd)
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216
217 # Usage: $(call if_changed_rule,foo)
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218 # Will check if $(cmd_foo) or any of the prerequisites changed,
219 # and if so will execute $(rule_foo).
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220 if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
221 @set -e; \
222 $(rule_$(1)))
223
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224 ###
225 # why - tell why a a target got build
226 # enabled by make V=2
227 # Output (listed in the order they are checked):
228 # (1) - due to target is PHONY
229 # (2) - due to target missing
230 # (3) - due to: file1.h file2.h
231 # (4) - due to command line change
232 # (5) - due to missing .cmd file
233 # (6) - due to target not in $(targets)
234 # (1) PHONY targets are always build
235 # (2) No target, so we better build it
236 # (3) Prerequisite is newer than target
237 # (4) The command line stored in the file named dir/.target.cmd
238 # differed from actual command line. This happens when compiler
239 # options changes
240 # (5) No dir/.target.cmd file (used to store command line)
241 # (6) No dir/.target.cmd file and target not listed in $(targets)
242 # This is a good hint that there is a bug in the kbuild file
243 ifeq ($(KBUILD_VERBOSE),2)
244 why = \
245 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
246 $(if $(wildcard $@), \
247 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
248 $(if $(arg-check), \
249 $(if $(cmd_$@),- due to command line change, \
250 $(if $(filter $@, $(targets)), \
251 - due to missing .cmd file, \
252 - due to $(notdir $@) not in $$(targets) \
253 ) \
254 ) \
255 ) \
256 ), \
257 - due to target missing \
258 ) \
259 )
260
261 echo-why = $(call escsq, $(strip $(why)))
262 endif
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