summaryrefslogtreecommitdiff
path: root/Rules.mak
blob: 85c707c56be3efe19533ed1e9dd0353612cdf88d (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
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
# Rules.make for busybox
#
# Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
#
# Licensed under GPLv2, see the file LICENSE in this tarball for details.
#

# Pull in the user's busybox configuration
ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
-include $(top_builddir)/.config
endif

#--------------------------------------------------------
PROG      := busybox
MAJOR_VERSION   :=1
MINOR_VERSION   :=2
SUBLEVEL_VERSION:=0
EXTRAVERSION    :=
VERSION   :=$(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL_VERSION)$(EXTRAVERSION)
BUILDTIME := $(shell TZ=UTC date -u "+%Y.%m.%d-%H:%M%z")


#--------------------------------------------------------
# With a modern GNU make(1) (highly recommended, that's what all the
# developers use), all of the following configuration values can be
# overridden at the command line.  For example:
#   make CROSS_COMPILE=powerpc-linux- top_srcdir="$HOME/busybox" PREFIX=/mnt/app
#--------------------------------------------------------

# If you are running a cross compiler, you will want to set CROSS_COMPILE
# to something more interesting...  Target architecture is determined
# by asking the CC compiler what arch it compiles things for, so unless
# your compiler is broken, you should not need to specify TARGET_ARCH
CC             = $(CROSS_COMPILE)gcc
AR             = $(CROSS_COMPILE)ar
AS             = $(CROSS_COMPILE)as
LD             = $(CROSS_COMPILE)ld
NM             = $(CROSS_COMPILE)nm
STRIP          = $(CROSS_COMPILE)strip
ELF2FLT        = $(CROSS_COMPILE)elf2flt
CPP            = $(CC) -E
SED           ?= sed
BZIP2         ?= bzip2


# What OS are you compiling busybox for?  This allows you to include
# OS specific things, syscall overrides, etc.
TARGET_OS=linux

# Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
LC_ALL:= C

# This must bind late because srcdir is reset for every source subdirectory.
INCS:=-I$(top_builddir)/include -I$(top_srcdir)/include
CFLAGS=$(INCS) -I$(srcdir) -D_GNU_SOURCE
CFLAGS+=$(CHECKED_CFLAGS)
ARFLAGS=cru

# gcc centric. Perhaps fiddle with findstring gcc,$(CC) for the rest
# get the CC MAJOR/MINOR version
CC_MAJOR:=$(shell printf "%02d" $(shell echo __GNUC__ | $(CC) -E -xc - | tail -n 1))
CC_MINOR:=$(shell printf "%02d" $(shell echo __GNUC_MINOR__ | $(CC) -E -xc - | tail -n 1))

#--------------------------------------------------------
export VERSION BUILDTIME HOSTCC HOSTCFLAGS CROSS_COMPILE CC AR AS LD NM STRIP CPP
ifeq ($(strip $(TARGET_ARCH)),)
TARGET_ARCH:=$(shell $(CC) -dumpmachine | $(SED) -e s'/-.*//' \
		-e 's/i.86/i386/' \
		-e 's/sparc.*/sparc/' \
		-e 's/arm.*/arm/g' \
		-e 's/m68k.*/m68k/' \
		-e 's/ppc/powerpc/g' \
		-e 's/v850.*/v850/g' \
		-e 's/sh[234]/sh/' \
		-e 's/mips-.*/mips/' \
		-e 's/mipsel-.*/mipsel/' \
		-e 's/cris.*/cris/' \
		)
endif

# A nifty macro to make testing gcc features easier, but note that everything
# that uses this _must_ use := or it will be re-evaluated everytime it is
# referenced.
ifeq ($(strip $(BUILD_VERBOSE)),2)
VERBOSE_CHECK_CC=echo CC=\"$(1)\" check_cc $(2) >&2;
endif
check_cc=$(shell \
	$(VERBOSE_CHECK_CC) \
	if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
		echo "int i;" > ./conftest.c; \
		if $(1) $(2) -c -o conftest.o conftest.c > /dev/null 2>&1; \
		then echo "$(2)"; else echo "$(3)"; fi ; \
		rm -f conftest.c conftest.o; \
	fi)

ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
check_cc:=
endif

# A not very robust macro to check for available ld flags
ifeq ($(strip $(BUILD_VERBOSE)),2)
VERBOSE_CHECK_LD=echo LD=\"$(1)\" check_ld $(2) >&2;
endif
check_ld=$(shell \
	$(VERBOSE_CHECK_LD) \
	if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
		$(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1 && \
		echo "-Wl,$(2)" ; \
	fi)

ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
check_ld:=
endif

# A not very robust macro to check for available strip flags
ifeq ($(strip $(BUILD_VERBOSE)),2)
VERBOSE_CHECK_STRIP=echo STRIPCMD=\"$(1)\" check_strip $(2) >&2;
endif
check_strip=$(shell \
	$(VERBOSE_CHECK_STRIP) \
	if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
		echo "int i;" > ./conftest.c ; \
		$(CC) -c -o conftest.o conftest.c > /dev/null 2>&1 ; \
		$(1) $(2) conftest.o > /dev/null 2>&1 && \
		echo "$(1) $(2)" || echo "$(3)"; \
		rm -f conftest.c conftest.o > /dev/null 2>&1 ; \
	fi)

ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
check_strip:=
endif


# Select the compiler needed to build binaries for your development system
HOSTCC     = gcc
HOSTCFLAGS:=$(call check_cc,$(HOSTCC),-Wall,)
HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-Wstrict-prototypes,)
HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-O2,)
HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-fomit-frame-pointer,)

LD_WHOLE_ARCHIVE:=$(shell echo "int i;" > conftest.c ; \
	$(CC) -c -o conftest.o conftest.c ; \
	echo "int main(void){return 0;}" > conftest_main.c ; \
	$(CC) -c -o conftest_main.o conftest_main.c ; \
	$(AR) $(ARFLAGS) conftest.a conftest.o ; \
	$(CC) -Wl,--whole-archive conftest.a -Wl,--no-whole-archive \
	 conftest_main.o -o conftest > /dev/null 2>&1 \
	 && echo "-Wl,--whole-archive" ; \
	rm conftest_main.o conftest_main.c conftest.o conftest.c \
	 conftest.a conftest > /dev/null 2>&1 ; )
ifneq ($(findstring whole-archive,$(LD_WHOLE_ARCHIVE)),)
LD_NO_WHOLE_ARCHIVE:= -Wl,--no-whole-archive
endif

LD_START_GROUP:=$(shell echo "int bar(void){return 0;}" > conftest.c ; \
	$(CC) -c -o conftest.o conftest.c ; \
	echo "int main(void){return bar();}" > conftest_main.c ; \
	$(CC) -c -o conftest_main.o conftest_main.c ; \
	$(AR) $(ARFLAGS) conftest.a conftest.o ; \
	$(CC) -Wl,--start-group conftest.a conftest_main.o -Wl,--end-group \
	 -o conftest > /dev/null 2>&1 && echo "-Wl,--start-group" ; \
	rm conftest_main.o conftest_main.c conftest.o conftest.c \
	 conftest.a conftest > /dev/null 2>&1 ; )
ifneq ($(findstring start-group,$(LD_START_GROUP)),)
LD_END_GROUP:= -Wl,--end-group
endif

CHECKED_LDFLAGS := $(call check_ld,$(LD),--warn-common,)
#CHECKED_LDFLAGS := $(call check_ld,$(LD),-static-libgcc,)

# Pin CHECKED_CFLAGS with := so it's only evaluated once.
CHECKED_CFLAGS:=$(call check_cc,$(CC),-Wall,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-funsigned-char,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-fno-builtin-strlen,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-finline-limit=0,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-static-libgcc,)

# Preemptively pin this too.
PROG_CFLAGS:=


#--------------------------------------------------------
# Arch specific compiler optimization stuff should go here.
# Unless you want to override the defaults, do not set anything
# for OPTIMIZATION...

# use '-Os' optimization if available, else use -O2
OPTIMIZATION:=$(call check_cc,$(CC),-Os,-O2)

ifeq ($(CONFIG_BUILD_AT_ONCE),y)
# gcc 2.95 exits with 0 for "unrecognized option"
ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 3 ] ; echo $$?)),0)
	CFLAGS_COMBINE:=$(call check_cc,$(CC),--combine,)
endif
OPTIMIZATION+=$(call check_cc,$(CC),-funit-at-a-time,)
OPTIMIZATION+=$(call check_cc,$(CC),-fgcse-after-reload,)
ifneq ($(CONFIG_BUILD_LIBBUSYBOX),y)
# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25795
# This prevents us from using -fwhole-program when we build the lib
PROG_CFLAGS+=$(call check_cc,$(CC),-fwhole-program,)
endif # CONFIG_BUILD_LIBBUSYBOX
endif # CONFIG_BUILD_AT_ONCE

LIB_LDFLAGS:=$(call check_ld,$(LD),--enable-new-dtags,)
#LIB_LDFLAGS+=$(call check_ld,$(LD),--reduce-memory-overheads,)
#LIB_LDFLAGS+=$(call check_ld,$(LD),--as-needed,)
#LIB_LDFLAGS+=$(call check_ld,$(LD),--warn-shared-textrel,)


# Some nice architecture specific optimizations
ifeq ($(strip $(TARGET_ARCH)),arm)
	OPTIMIZATION+=-fstrict-aliasing
endif
ifeq ($(strip $(TARGET_ARCH)),i386)
	OPTIMIZATION+=$(call check_cc,$(CC),-march=i386,)
# gcc-4.0 and older seem to benefit from these
ifneq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
	OPTIMIZATION+=$(call check_cc,$(CC),-mpreferred-stack-boundary=2,)
	OPTIMIZATION+=$(call check_cc,$(CC),-falign-functions=1 -falign-jumps=1 -falign-loops=1, -malign-functions=0 -malign-jumps=0 -malign-loops=0,)

	# gcc 4.1 produces many broken, totally invalid warnings
	CHECKED_CFLAGS+=$(call check_cc,$(CC),-Werror,)
endif # gcc-4.0 and older

# gcc-4.1 and beyond seem to benefit from these
ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
	# turn off flags which hurt -Os
	OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-loop-optimize,)
	OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-dominator-opts,)
	OPTIMIZATION+=$(call check_cc,$(CC),-fno-strength-reduce,)

	OPTIMIZATION+=$(call check_cc,$(CC),-fno-branch-count-reg,)
endif # gcc-4.1 and beyond
endif
OPTIMIZATION+=$(call check_cc,$(CC),-fomit-frame-pointer,)
OPTIMIZATION+=$(call check_cc,$(CC),-ffunction-sections -fdata-sections,)

#
#--------------------------------------------------------
# If you're going to do a lot of builds with a non-vanilla configuration,
# it makes sense to adjust parameters above, so you can type "make"
# by itself, instead of following it by the same half-dozen overrides
# every time.  The stuff below, on the other hand, is probably less
# prone to casual user adjustment.
#

ifeq ($(strip $(CONFIG_LFS)),y)
    # For large file summit support
    CFLAGS+=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
endif
ifeq ($(strip $(CONFIG_DMALLOC)),y)
    # For testing mem leaks with dmalloc
    CFLAGS+=-DDMALLOC
    LIBRARIES:=-ldmalloc
else
    ifeq ($(strip $(CONFIG_EFENCE)),y)
	LIBRARIES:=-lefence
    endif
endif

# Debugging info

ifeq ($(strip $(CONFIG_DEBUG)),y)
    CFLAGS +=-g
else
    CFLAGS +=-DNDEBUG
    CHECKED_LDFLAGS += $(call check_ld,$(LD),--sort-common,)
    CHECKED_LDFLAGS += $(call check_ld,$(LD),--gc-sections,)
endif

ifneq ($(strip $(CONFIG_DEBUG_PESSIMIZE)),y)
    CFLAGS += $(OPTIMIZATION)
endif

# warn a bit more verbosely for non-release versions
ifneq ($(EXTRAVERSION),)
    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-prototypes,)
    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-declarations,)
    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wunused,)
    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Winit-self,)
    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wcast-align,)
endif
STRIPCMD:=$(call check_strip,$(STRIP),-s --remove-section=.note --remove-section=.comment,$(STRIP))
ifeq ($(strip $(CONFIG_STATIC)),y)
    PROG_CFLAGS += $(call check_cc,$(CC),-static,)
endif
CFLAGS_SHARED := $(call check_cc,$(CC),-shared,)
LIB_CFLAGS+=$(CFLAGS_SHARED)

ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
    CFLAGS_PIC:= $(call check_cc,$(CC),-fPIC,)
    LIB_CFLAGS+=$(CFLAGS_PIC)
endif

ifeq ($(strip $(CONFIG_SELINUX)),y)
    LIBRARIES += -lselinux
endif

ifeq ($(strip $(PREFIX)),)
    PREFIX:=`pwd`/_install
endif

ifneq ($(strip $(CONFIG_GETOPT_LONG)),y)
    CFLAGS += -D__need_getopt
endif

# Additional complications due to support for pristine source dir.
# Include files in the build directory should take precedence over
# the copy in top_srcdir, both during the compilation phase and the
# shell script that finds the list of object files.
# Work in progress by <ldoolitt@recycle.lbl.gov>.


OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
CFLAGS  += $(CHECKED_CFLAGS) $(CROSS_CFLAGS)
LDFLAGS += $(CHECKED_LDFLAGS)

ifdef BB_INIT_SCRIPT
    CFLAGS += -DINIT_SCRIPT='"$(BB_INIT_SCRIPT)"'
endif

# Put user-supplied flags at the end, where they
# have a chance of winning.
-include $(top_builddir)/.config.mak

#------------------------------------------------------------
# Installation options
ifeq ($(strip $(CONFIG_INSTALL_APPLET_HARDLINKS)),y)
INSTALL_OPTS=--hardlinks
endif
ifeq ($(strip $(CONFIG_INSTALL_APPLET_SYMLINKS)),y)
INSTALL_OPTS=--symlinks
endif
ifeq ($(strip $(CONFIG_INSTALL_APPLET_DONT)),y)
INSTALL_OPTS=
endif

#------------------------------------------------------------
# Make the output nice and tight
MAKEFLAGS += --no-print-directory
export MAKE_IS_SILENT=n
ifneq ($(findstring s,$(MAKEFLAGS)),)
export MAKE_IS_SILENT=y
SECHO := @-false
DISP  := sil
Q     := @
else
ifneq ($(BUILD_VERBOSE),)
SECHO := @-false
DISP  := ver
Q     := 
else
SECHO := @echo
DISP  := pur
Q     := @
endif
endif

show_objs = $(subst $(top_builddir)/,,$(subst ../,,$@))
pur_disp_compile.c = echo "  "CC $(show_objs)
pur_disp_compile.h = echo "  "HOSTCC $(show_objs)
pur_disp_strip     = echo "  "STRIP $(show_objs)
pur_disp_link      = echo "  "LINK $(show_objs)
pur_disp_link.h    = echo "  "HOSTLINK $(show_objs)
pur_disp_ar        = echo "  "AR $(ARFLAGS) $(show_objs)
pur_disp_elf2flt   = echo "  "ELF2FLT $(ELF2FLTFLAGS) $(show_objs)
sil_disp_compile.c = true
sil_disp_compile.h = true
sil_disp_strip     = true
sil_disp_link      = true
sil_disp_link.h    = true
sil_disp_ar        = true
sil_disp_elf2flt   = true
ver_disp_compile.c = echo $(cmd_compile.c)
ver_disp_compile.h = echo $(cmd_compile.h)
ver_disp_strip     = echo $(cmd_strip)
ver_disp_link      = echo $(cmd_link)
ver_disp_link.h    = echo $(cmd_link.h)
ver_disp_ar        = echo $(cmd_ar)
ver_disp_elf2flt   = echo $(cmd_elf2flt)
disp_compile.c     = $($(DISP)_disp_compile.c)
disp_compile.h     = $($(DISP)_disp_compile.h)
disp_strip         = $($(DISP)_disp_strip)
disp_link          = $($(DISP)_disp_link)
disp_link.h        = $($(DISP)_disp_link.h)
disp_ar            = $($(DISP)_disp_ar)
disp_gen           = $(SECHO) "  "GEN $@ ; true
disp_doc           = $(SECHO) "  "DOC $(subst docs/,,$@) ; true
disp_elf2flt       = $($(DISP)_disp_elf2flt)
cmd_compile.c      = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
cmd_compile.h      = $(HOSTCC) $(HOSTCFLAGS) $(INCS) -c -o $@ $<
cmd_strip          = $(STRIPCMD) $@
cmd_link           = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS) \
			$(PROG_CFLAGS) $(PROG_LDFLAGS) $(CFLAGS_COMBINE) \
			-o $@ $(LD_START_GROUP)  \
			$(APPLETS_DEFINE) $(APPLET_SRC) \
			$(BUSYBOX_DEFINE) $(BUSYBOX_SRC) $(libraries-y) \
			$(LDBUSYBOX) $(LIBRARIES) \
			$(LD_END_GROUP)
cmd_link.so        = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS) \
			$(LIB_CFLAGS) $(CFLAGS_COMBINE) $(LIB_LDFLAGS) \
			-o $(@) $(LD_START_GROUP) $(LD_WHOLE_ARCHIVE) \
			$(LIBRARY_DEFINE) $(^) \
			$(LD_NO_WHOLE_ARCHIVE) $(LD_END_GROUP)
cmd_link.h         = $(HOSTCC) $(HOSTCFLAGS) $(INCS) $< -o $@
cmd_ar             = $(AR) $(ARFLAGS) $@ $^
cmd_elf2flt        = $(ELF2FLT) $(ELF2FLTFLAGS) $< -o $@
compile.c          = @$(disp_compile.c) ; $(cmd_compile.c)
compile.h          = @$(disp_compile.h) ; $(cmd_compile.h)
do_strip           = @$(disp_strip)     ; $(cmd_strip)
do_link            = @$(disp_link)      ; $(cmd_link)
do_link.so         = @$(disp_link)      ; $(cmd_link.so)
do_link.h          = @$(disp_link.h)    ; $(cmd_link.h)
do_ar              = @$(disp_ar)        ; $(cmd_ar)
do_elf2flt         = @$(disp_elf2flt)   ; $(cmd_elf2flt)

uppercase = $(shell echo $1 | $(SED) -e "y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/")
%.a:
	@if test -z "$($(call uppercase,$*)_DIR)" ; then \
		echo "Invalid target $@" ; \
		exit 1 ; \
	fi
	$(Q)$(MAKE) $($(call uppercase,$*)_DIR)$@

.PHONY: dummy