aboutsummaryrefslogtreecommitdiffstats
path: root/Make.rules
blob: 3bdf2670e1f8f7e22be48a791d8246334e08536e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
##
# A set of makefile rules loosely based on kbuild.

all: compile

ifndef build

toplevelrun:=yes

##
# Disable default rules and make output pretty.

MAKEFLAGS += -rR --no-print-directory

Makefile: ;

ifdef V
  ifeq ("$(origin V)", "command line")
    VERBOSE = $(V)
  endif
endif
ifndef VERBOSE
  VERBOSE = 0
endif

ifeq ($(VERBOSE),1)
  quiet =
  Q =
else
  quiet=quiet_
  Q = @
endif

ifneq ($(findstring s,$(MAKEFLAGS)),)
  quiet=silent_
endif

export quiet Q VERBOSE

##
# Recursion helpers.
srctree		:= $(CURDIR)
objtree		:= $(CURDIR)

export srctree objtree

##
# Consult SCM for better version string.

TAGPREFIX	?= v

GIT_REV := $(shell test -d .git && git describe || echo exported)
ifneq ($(GIT_REV), exported)
FULL_VERSION	:= $(patsubst $(TAGPREFIX)%,%,$(GIT_REV))
else
FULL_VERSION	:= $(VERSION)
endif

RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o

export FULL_VERSION RCS_FIND_IGNORE

##
# Utilities and default flags for them.

CROSS_COMPILE	?=
CC		:= $(CROSS_COMPILE)gcc
LD		:= $(CROSS_COMPILE)ld
INSTALL		:= install
INSTALLDIR	:= $(INSTALL) -d

CFLAGS		?= -g -O2
CFLAGS_ALL	:= -Werror -Wall -Wstrict-prototypes -D_GNU_SOURCE -std=gnu99
CFLAGS_ALL	+= $(CFLAGS)

LDFLAGS		?= -g
LDFLAGS_ALL	+= $(LDFLAGS)

export CC LD INSTALL INSTALLDIR CFLAGS_ALL LDFLAGS_ALL

build		:=

endif

##
# Reset all variables.
ifneq ($(origin targets),file)
targets		:=
endif

src		:=
obj		:=

src		+= $(build)
obj		:= $(build)

##
# Include directory specific stuff

ifneq ($(build),)
$(build)/Makefile: ;
include $(build)/Makefile
endif

##
# Rules and helpers

PHONY += all compile install clean FORCE

# Convinient variables
comma   := ,
squote  := '
empty   :=
space   := $(empty) $(empty)

# The temporary file to save gcc -MD generated dependencies must not
# contain a comma
depfile = $(subst $(comma),_,$(@D)/.$(@F).d)

build-dir  = $(patsubst %/,%,$(dir $@))
target-dir = $(dir $@)

##
# Build rules

ifneq ($(NOCMDDEP),1)
# Check if both arguments has same arguments. Result in empty string if equal
# User may override this check using make NOCMDDEP=1
# Check if both arguments has same arguments. Result is empty string if equal.
# User may override this check using make KBUILD_NOCMDDEP=1
arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
                    $(filter-out $(cmd_$@),   $(cmd_$(1))) )
endif

# echo command.
# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
echo-cmd = $(if $($(quiet)cmd_$(1)),\
	echo '  $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)

make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1)))))

# printing commands
cmd = @$(echo-cmd) $(cmd_$(1))

# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
dot-target = $(dir $@).$(notdir $@)

# The temporary file to save gcc -MD generated dependencies must not
# contain a comma
depfile = $(subst $(comma),_,$(dot-target).d)

# Escape single quote for use in echo statements
escsq = $(subst $(squote),'\$(squote)',$1)

# Find any prerequisites that is newer than target or that does not exist.
# PHONY targets skipped in both cases.
local-target-prereqs = %
any-prereq = $(filter $(local-target-prereqs), $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^), $^))

# Execute command if command has changed or prerequisite(s) are updated.
#
if_changed = $(if $(strip $(any-prereq) $(arg-check)),                       \
	@set -e;                                                             \
	$(echo-cmd) $(cmd_$(1));                                             \
	echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)

# Usage: $(call if_changed_rule,foo)
# Will check if $(cmd_foo) or any of the prerequisites changed,
# and if so will execute $(rule_foo).
if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ),                 \
	@set -e;                                                             \
	$(rule_$(1)))

#####
# Handle options to gcc.

c_flags		= -Wp,-MD,$(depfile),-MT,$@ $(CFLAGS_ALL) $(CFLAGS_EXTRA) \
		  $(CFLAGS_$(notdir $@))
ld_flags	= $(LDFLAGS_ALL) $(LDFLAGS_EXTRA) $(LDFLAGS_$(notdir $@))

#####
# Compile c-files.
quiet_cmd_cc_o_c = CC      $@

cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<

define rule_cc_o_c
	$(call echo-cmd,cc_o_c) $(cmd_cc_o_c);		\
	(echo 'cmd_$@ := $(call make-cmd,cc_o_c)'; echo; cat $(depfile)) \
		> $(dot-target).cmd ; \
	rm $(depfile)
endef

$(obj)/%.o: override local-target-prereqs=%

$(obj)/%.o: $(src)/%.c FORCE
	$(call if_changed_rule,cc_o_c)

#####
# Link programs

# Link an executable based on list of .o files, all plain c
# host-cmulti -> executable
__progs	:= $(addprefix $(obj)/,$(sort $(progs-y)))
cobjs	:= $(addprefix $(obj)/,$(sort $(foreach m,$(progs-y),$($(m)-objs))))

quiet_cmd_ld	= LD      $@
      cmd_ld	= $(CC) $(ld_flags) -o $@ \
			  $(addprefix $(obj)/,$($(@F)-objs)) \
			  $(LIBS) $(LIBS_$(@F))

$(__progs): override local-target-prereqs=$(addprefix $(obj)/,$($(*F)-objs))

$(__progs): $(obj)/%: $(cobjs) FORCE
	$(call if_changed,ld)

targets += $(__progs) $(cobjs)

###
# why - tell why a a target got build
ifeq ($(VERBOSE),2)
why =                                                                        \
    $(if $(filter $@, $(PHONY)),- due to target is PHONY,                    \
        $(if $(wildcard $@),                                                 \
            $(if $(strip $(any-prereq)),- due to: $(any-prereq),             \
                $(if $(arg-check),                                           \
                    $(if $(cmd_$@),- due to command line change: $(arg-check),             \
                        $(if $(filter $@, $(targets)),                       \
                            - due to missing .cmd file,                      \
                            - due to $(notdir $@) not in $$(targets)         \
                         )                                                   \
                     )                                                       \
                 )                                                           \
             ),                                                              \
             - due to target missing                                         \
         )                                                                   \
     )

echo-why = $(call escsq, $(strip $(why)))
endif

##
# Top level rules.

%/: FORCE
	$(Q)$(MAKE) -f Make.rules build=$(build-dir) $(MAKECMDGOALS)

compile: $(targets)
	@:

install: $(targets) FORCE

clean: $(filter %/,$(targets))
ifeq ($(toplevelrun),yes)
	$(Q)find . $(RCS_FIND_IGNORE) \
		\( -name '*.[oas]' -o -name '.*.cmd' -o -name '.*.d' \) \
		-type f -print | xargs rm -f
endif
	$(Q)rm -rf $(addprefix $(obj)/,$(sort $(progs-y) $(progs-n) $(progs-)))

ifeq ($(origin VERSION),command line)
DIST_VERSION=$(VERSION)
else
DIST_VERSION=$(FULL_VERSION)
endif

dist:
	git archive --format tar --prefix=$(PACKAGE)-$(DIST_VERSION)/ \
		$(TAGPREFIX)$(DIST_VERSION) \
		| bzip2 -9 > $(PACKAGE)-$(DIST_VERSION).tar.bz2

FORCE:

# Read all saved command lines and dependencies for the $(targets) we
# may be building above, using $(if_changed{,_dep}). As an
# optimization, we don't need to read them if the target does not
# exist, we will rebuild anyway in that case.

targets := $(wildcard $(sort $(targets)))
cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))

ifneq ($(cmd_files),)
  include $(cmd_files)
endif

# Declare the contents of the .PHONY variable as phony.  We keep that
# information in a variable se we can use it in if_changed and friends.

.PHONY: $(PHONY)