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Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001# ==========================================================================
Denis Vlasenkoda8f43f2006-10-09 19:47:38 +00002# Build system
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00003# ==========================================================================
4
5BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
Denis Vlasenkodef88982007-10-07 17:06:01 +00006export BB_VER
Mike Frysingerb78d5612010-11-16 09:01:30 -05007SKIP_STRIP ?= n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00008
Denis Vlasenkobf11e892006-11-26 22:17:46 +00009# -std=gnu99 needed for [U]LLONG_MAX on some systems
Bernhard Reutner-Fischer82f87882007-01-23 11:39:13 +000010CPPFLAGS += $(call cc-option,-std=gnu99,)
Denis Vlasenko9dca07d2007-01-27 14:03:15 +000011
Denis Vlasenko7039a662006-10-08 17:54:47 +000012CPPFLAGS += \
13 -Iinclude -Ilibbb \
Denis Vlasenko4b04f542008-05-08 16:26:49 +000014 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include -I$(srctree)/libbb) \
Denis Vlasenko7039a662006-10-08 17:54:47 +000015 -include include/autoconf.h \
16 -D_GNU_SOURCE -DNDEBUG \
17 $(if $(CONFIG_LFS),-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64) \
Bernhard Reutner-Fischerfeea1b92006-12-06 21:51:59 +000018 -D"BB_VER=KBUILD_STR($(BB_VER))" -DBB_BT=AUTOCONF_TIMESTAMP
19
Denis Vlasenko55995022008-05-18 22:28:26 +000020CFLAGS += $(call cc-option,-Wall,)
21CFLAGS += $(call cc-option,-Wshadow,)
22CFLAGS += $(call cc-option,-Wwrite-strings,)
23CFLAGS += $(call cc-option,-Wundef,)
24CFLAGS += $(call cc-option,-Wstrict-prototypes,)
Denis Vlasenko68404f12008-03-17 09:00:54 +000025CFLAGS += $(call cc-option,-Wunused -Wunused-parameter,)
Bernhard Reutner-Fischer0d22d172009-02-18 13:23:46 +000026CFLAGS += $(call cc-option,-Wunused-function -Wunused-value,)
Denis Vlasenkoe2513372008-05-15 21:44:46 +000027CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
Mike Frysingerca81a932012-08-04 16:14:24 -040028CFLAGS += $(call cc-option,-Wno-format-security,)
Denis Vlasenko55995022008-05-18 22:28:26 +000029# warn about C99 declaration after statement
30CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Denis Vlasenkoe2513372008-05-15 21:44:46 +000031# If you want to add more -Wsomething above, make sure that it is
32# still possible to build bbox without warnings.
Denis Vlasenkoc562bb72007-01-29 17:08:51 +000033
Denis Vlasenko4bb31892007-02-01 01:51:36 +000034ifeq ($(CONFIG_WERROR),y)
35CFLAGS += $(call cc-option,-Werror,)
Denys Vlasenkodc3d8932009-08-22 02:34:10 +020036## TODO:
37## gcc version 4.4.0 20090506 (Red Hat 4.4.0-4) (GCC) is a PITA:
38## const char *ptr; ... off_t v = *(off_t*)ptr; -> BOOM
39## and no easy way to convince it to shut the hell up.
40## We have a lot of such things all over the place.
41## Classic *(off_t*)(void*)ptr does not work,
42## and I am unwilling to do crazy gcc specific ({ void *ppp = ...; })
43## stuff in macros. This would obfuscate the code too much.
Dan Fandrich1821d182010-02-04 04:04:56 +010044## Maybe try __attribute__((__may_alias__))?
Denys Vlasenkodc3d8932009-08-22 02:34:10 +020045#CFLAGS += $(call cc-ifversion, -eq, 0404, -fno-strict-aliasing)
Denis Vlasenko4bb31892007-02-01 01:51:36 +000046endif
Denis Vlasenkoc562bb72007-01-29 17:08:51 +000047# gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
48CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
49
Denis Vlasenkobd8390a2008-06-12 20:23:03 +000050CFLAGS += $(call cc-option,-fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
Denis Vlasenkoe0eebc12007-01-27 13:44:53 +000051# -fno-guess-branch-probability: prohibit pseudo-random guessing
Denis Vlasenko9dca07d2007-01-27 14:03:15 +000052# of branch probabilities (hopefully makes bloatcheck more stable):
53CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
54CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
Denis Vlasenkoe0eebc12007-01-27 13:44:53 +000055CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
Denys Vlasenko9b80b902012-09-04 11:46:44 +020056# Defeat .eh_frame bloat (gcc 4.6.3 x86-32 defconfig: 20% smaller busybox binary):
57CFLAGS += $(call cc-option,-fno-unwind-tables,)
58CFLAGS += $(call cc-option,-fno-asynchronous-unwind-tables,)
Bernhard Reutner-Fischer82f87882007-01-23 11:39:13 +000059
Bernhard Reutner-Fischerfdcd7c42007-01-22 17:50:21 +000060# FIXME: These warnings are at least partially to be concerned about and should
61# be fixed..
Bernhard Reutner-Fischere6ce8242008-08-05 19:06:35 +000062#CFLAGS += $(call cc-option,-Wconversion,)
Bernhard Reutner-Fischer9729e652006-12-13 17:44:24 +000063
Denis Vlasenkobd8390a2008-06-12 20:23:03 +000064ifneq ($(CONFIG_DEBUG),y)
Wolfgang Denk91b77c32011-05-01 14:00:27 +020065CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,))
Denis Vlasenkobd8390a2008-06-12 20:23:03 +000066else
67CFLAGS += $(call cc-option,-g,)
Bernhard Reutner-Fischere6ce8242008-08-05 19:06:35 +000068#CFLAGS += "-D_FORTIFY_SOURCE=2"
Denis Vlasenkobd8390a2008-06-12 20:23:03 +000069ifeq ($(CONFIG_DEBUG_PESSIMIZE),y)
70CFLAGS += $(call cc-option,-O0,)
71else
Wolfgang Denk91b77c32011-05-01 14:00:27 +020072CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,))
Denis Vlasenkobd8390a2008-06-12 20:23:03 +000073endif
Bernhard Reutner-Fischer9729e652006-12-13 17:44:24 +000074endif
75
Denis Vlasenko1da86d22008-06-04 11:28:24 +000076# If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)...
77ARCH_FPIC ?= -fpic
78ARCH_FPIE ?= -fpie
79ARCH_PIE ?= -pie
80
Mike Frysinger5694afd2012-10-20 15:01:26 -040081# Usage: $(eval $(call pkg_check_modules,VARIABLE-PREFIX,MODULES))
82define pkg_check_modules
83$(1)_CFLAGS := $(shell $(PKG_CONFIG) $(PKG_CONFIG_FLAGS) --cflags $(2))
84$(1)_LIBS := $(shell $(PKG_CONFIG) $(PKG_CONFIG_FLAGS) --libs $(2))
85endef
86
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +000087ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
Denis Vlasenko8d82cf72007-10-11 10:02:52 +000088# on i386: 14% smaller libbusybox.so
89# (code itself is 9% bigger, we save on relocs/PLT/GOT)
Denis Vlasenko1da86d22008-06-04 11:28:24 +000090CFLAGS += $(ARCH_FPIC)
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +000091# and another 4% reduction of libbusybox.so:
92# (external entry points must be marked EXTERNALLY_VISIBLE)
93CFLAGS += $(call cc-option,-fvisibility=hidden)
Denis Vlasenko8d82cf72007-10-11 10:02:52 +000094endif
95
Bernhard Reutner-Fischerc1feac62007-01-08 16:29:15 +000096ifeq ($(CONFIG_STATIC),y)
Denis Vlasenko1da86d22008-06-04 11:28:24 +000097CFLAGS_busybox += -static
Mike Frysinger5694afd2012-10-20 15:01:26 -040098PKG_CONFIG_FLAGS += --static
Denis Vlasenko1da86d22008-06-04 11:28:24 +000099endif
100
101ifeq ($(CONFIG_PIE),y)
102CFLAGS_busybox += $(ARCH_PIE)
103CFLAGS += $(ARCH_FPIE)
Bernhard Reutner-Fischerc1feac62007-01-08 16:29:15 +0000104endif
Denis Vlasenkod46d3c22007-02-06 19:28:50 +0000105
Bernhard Reutner-Fischerf6107c72009-01-22 13:27:14 +0000106ifneq ($(CONFIG_EXTRA_CFLAGS),)
107CFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_CFLAGS)))
108#"))
109endif
110
Denys Vlasenko39c2cb22012-03-08 00:20:01 +0100111# Note: both "" (string consisting of two quote chars) and empty string
112# are possible, and should be skipped below.
113ifneq ($(subst "",,$(CONFIG_SYSROOT)),)
Rob Walkerbf634372012-03-07 12:25:53 +0100114CFLAGS += --sysroot=$(CONFIG_SYSROOT)
115export SYSROOT=$(CONFIG_SYSROOT)
116endif
117
Denys Vlasenkoc5289172012-03-10 16:30:00 +0100118# Android has no separate crypt library
Denys Vlasenko6dca1722012-04-20 18:24:09 +0200119# gcc-4.2.1 fails if we try to feed C source on stdin:
120# echo 'int main(void){return 0;}' | $(CC) $(CFLAGS) -lcrypt -o /dev/null -xc -
121# fall back to using a temp file:
122CRYPT_AVAILABLE := $(shell echo 'int main(void){return 0;}' >crypttest.c; $(CC) $(CFLAGS) -lcrypt -o /dev/null crypttest.c >/dev/null 2>&1 && echo "y"; rm crypttest.c)
Denys Vlasenkoc5289172012-03-10 16:30:00 +0100123ifeq ($(CRYPT_AVAILABLE),y)
Denys Vlasenko2156e222015-09-04 04:20:51 +0200124LDLIBS += m crypt
Denys Vlasenkoc5289172012-03-10 16:30:00 +0100125else
126LDLIBS += m
127endif
128
Denys Vlasenko5fa6d1a2015-10-05 11:15:43 +0200129ifeq ($(CONFIG_LINK_WITH_PTHREAD),y)
Denys Vlasenko2156e222015-09-04 04:20:51 +0200130PTHREAD_AVAILABLE := $(shell echo 'int main(void){return 0;}' >pthreadtest.c; $(CC) $(CFLAGS) -lpthread -o /dev/null pthreadtest.c >/dev/null 2>&1 && echo "y"; rm pthreadtest.c)
131ifeq ($(PTHREAD_AVAILABLE),y)
132LDLIBS += pthread
133endif
Denys Vlasenko5fa6d1a2015-10-05 11:15:43 +0200134endif
Denys Vlasenko2156e222015-09-04 04:20:51 +0200135
Denis Vlasenkod6e81c72007-08-21 10:58:18 +0000136ifeq ($(CONFIG_PAM),y)
Bartosz Golaszewskibb2fd672015-08-14 08:50:00 +0200137# libpam uses libpthread, libdl and libaudit, so for static builds busybox
138# must be linked to libpthread, libdl and libaudit. On some platforms that
139# requires an explicit -lpthread, -ldl and -laudit, so it should be in
140# LDLIBS. For non-static builds, scripts/trylink will take care of removing
141# these flags if possible. (Not bothering to check CONFIG_STATIC because
142# even in a non-static build it could be that the only libpam available is
143# libpam.a, so -lpthread & Co. could still be needed.)
144LDLIBS += pam pam_misc pthread dl audit
Denis Vlasenkod6e81c72007-08-21 10:58:18 +0000145endif
146
Denis Vlasenkod46d3c22007-02-06 19:28:50 +0000147ifeq ($(CONFIG_SELINUX),y)
Mike Frysinger5694afd2012-10-20 15:01:26 -0400148SELINUX_PC_MODULES = libselinux libsepol
149$(eval $(call pkg_check_modules,SELINUX,$(SELINUX_PC_MODULES)))
150CPPFLAGS += $(SELINUX_CFLAGS)
151LDLIBS += $(if $(SELINUX_LIBS),$(SELINUX_LIBS:-l%=%),$(SELINUX_PC_MODULES:lib%=%))
Denis Vlasenkod46d3c22007-02-06 19:28:50 +0000152endif
Bernhard Reutner-Fischer58a275b2007-03-28 15:00:27 +0000153
154ifeq ($(CONFIG_EFENCE),y)
Denis Vlasenko76a6b232007-10-07 17:05:42 +0000155LDLIBS += efence
Bernhard Reutner-Fischer58a275b2007-03-28 15:00:27 +0000156endif
157
158ifeq ($(CONFIG_DMALLOC),y)
Denis Vlasenko76a6b232007-10-07 17:05:42 +0000159LDLIBS += dmalloc
Bernhard Reutner-Fischer58a275b2007-03-28 15:00:27 +0000160endif
161
Mike Frysingerdec37b32009-03-12 07:56:49 +0000162# If a flat binary should be built, CFLAGS_busybox="-elf2flt"
Denis Vlasenko401de642008-06-06 16:11:12 +0000163# env var should be set for make invocation.
164# Here we check whether CFLAGS_busybox indeed contains that flag.
165# (For historical reasons, we also check LDFLAGS, which doesn't
Mike Frysingerdec37b32009-03-12 07:56:49 +0000166# seem to be entirely correct variable to put "-elf2flt" into).
167W_ELF2FLT = -elf2flt
Denis Vlasenko401de642008-06-06 16:11:12 +0000168ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox)))
Mike Frysinger5b5bcf22007-06-19 15:58:02 +0000169SKIP_STRIP = y
170endif
171
Rob Walkerbf634372012-03-07 12:25:53 +0100172ifneq ($(CONFIG_EXTRA_LDFLAGS),)
Denys Vlasenkoe0ddb652015-04-14 14:15:15 +0200173LDFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_LDFLAGS)))
Rob Walkerbf634372012-03-07 12:25:53 +0100174#"))
175endif
176
177ifneq ($(CONFIG_EXTRA_LDLIBS),)
178LDLIBS += $(strip $(subst ",,$(CONFIG_EXTRA_LDLIBS)))
179#"))
180endif
181
Mike Frysingerc7b10dc2007-04-05 21:10:59 +0000182# Busybox is a stack-fatty so make sure we increase default size
Denis Vlasenko931de892007-06-21 12:43:45 +0000183# TODO: use "make stksizes" to find & fix big stack users
184# (we stole scripts/checkstack.pl from the kernel... thanks guys!)
Denis Vlasenkofcfb5c02007-12-24 12:16:24 +0000185# Reduced from 20k to 16k in 1.9.0.
186FLTFLAGS += -s 16000