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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,)
Denis Vlasenko55995022008-05-18 22:28:26 +000028# warn about C99 declaration after statement
29CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Denis Vlasenkoe2513372008-05-15 21:44:46 +000030# If you want to add more -Wsomething above, make sure that it is
31# still possible to build bbox without warnings.
Denis Vlasenkoc562bb72007-01-29 17:08:51 +000032
Denis Vlasenko4bb31892007-02-01 01:51:36 +000033ifeq ($(CONFIG_WERROR),y)
34CFLAGS += $(call cc-option,-Werror,)
Denys Vlasenkodc3d8932009-08-22 02:34:10 +020035## TODO:
36## gcc version 4.4.0 20090506 (Red Hat 4.4.0-4) (GCC) is a PITA:
37## const char *ptr; ... off_t v = *(off_t*)ptr; -> BOOM
38## and no easy way to convince it to shut the hell up.
39## We have a lot of such things all over the place.
40## Classic *(off_t*)(void*)ptr does not work,
41## and I am unwilling to do crazy gcc specific ({ void *ppp = ...; })
42## stuff in macros. This would obfuscate the code too much.
Dan Fandrich1821d182010-02-04 04:04:56 +010043## Maybe try __attribute__((__may_alias__))?
Denys Vlasenkodc3d8932009-08-22 02:34:10 +020044#CFLAGS += $(call cc-ifversion, -eq, 0404, -fno-strict-aliasing)
Denis Vlasenko4bb31892007-02-01 01:51:36 +000045endif
Denis Vlasenkoc562bb72007-01-29 17:08:51 +000046# gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
47CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
48
Denis Vlasenkobd8390a2008-06-12 20:23:03 +000049CFLAGS += $(call cc-option,-fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
Denis Vlasenkoe0eebc12007-01-27 13:44:53 +000050# -fno-guess-branch-probability: prohibit pseudo-random guessing
Denis Vlasenko9dca07d2007-01-27 14:03:15 +000051# of branch probabilities (hopefully makes bloatcheck more stable):
52CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
53CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
Denis Vlasenkoe0eebc12007-01-27 13:44:53 +000054CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
Bernhard Reutner-Fischer82f87882007-01-23 11:39:13 +000055
Bernhard Reutner-Fischerfdcd7c42007-01-22 17:50:21 +000056# FIXME: These warnings are at least partially to be concerned about and should
57# be fixed..
Bernhard Reutner-Fischere6ce8242008-08-05 19:06:35 +000058#CFLAGS += $(call cc-option,-Wconversion,)
Bernhard Reutner-Fischer9729e652006-12-13 17:44:24 +000059
Denis Vlasenkobd8390a2008-06-12 20:23:03 +000060ifneq ($(CONFIG_DEBUG),y)
Wolfgang Denk91b77c32011-05-01 14:00:27 +020061CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,))
Denis Vlasenkobd8390a2008-06-12 20:23:03 +000062else
63CFLAGS += $(call cc-option,-g,)
Bernhard Reutner-Fischere6ce8242008-08-05 19:06:35 +000064#CFLAGS += "-D_FORTIFY_SOURCE=2"
Denis Vlasenkobd8390a2008-06-12 20:23:03 +000065ifeq ($(CONFIG_DEBUG_PESSIMIZE),y)
66CFLAGS += $(call cc-option,-O0,)
67else
Wolfgang Denk91b77c32011-05-01 14:00:27 +020068CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,))
Denis Vlasenkobd8390a2008-06-12 20:23:03 +000069endif
Bernhard Reutner-Fischer9729e652006-12-13 17:44:24 +000070endif
71
Denis Vlasenko1da86d22008-06-04 11:28:24 +000072# If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)...
73ARCH_FPIC ?= -fpic
74ARCH_FPIE ?= -fpie
75ARCH_PIE ?= -pie
76
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +000077ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
Denis Vlasenko8d82cf72007-10-11 10:02:52 +000078# on i386: 14% smaller libbusybox.so
79# (code itself is 9% bigger, we save on relocs/PLT/GOT)
Denis Vlasenko1da86d22008-06-04 11:28:24 +000080CFLAGS += $(ARCH_FPIC)
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +000081# and another 4% reduction of libbusybox.so:
82# (external entry points must be marked EXTERNALLY_VISIBLE)
83CFLAGS += $(call cc-option,-fvisibility=hidden)
Denis Vlasenko8d82cf72007-10-11 10:02:52 +000084endif
85
Bernhard Reutner-Fischerc1feac62007-01-08 16:29:15 +000086ifeq ($(CONFIG_STATIC),y)
Denis Vlasenko1da86d22008-06-04 11:28:24 +000087CFLAGS_busybox += -static
88endif
89
90ifeq ($(CONFIG_PIE),y)
91CFLAGS_busybox += $(ARCH_PIE)
92CFLAGS += $(ARCH_FPIE)
Bernhard Reutner-Fischerc1feac62007-01-08 16:29:15 +000093endif
Denis Vlasenkod46d3c22007-02-06 19:28:50 +000094
Bernhard Reutner-Fischerf6107c72009-01-22 13:27:14 +000095ifneq ($(CONFIG_EXTRA_CFLAGS),)
96CFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_CFLAGS)))
97#"))
98endif
99
Denys Vlasenkoe0894f52011-09-09 18:00:44 +0200100ifneq ($(CONFIG_CROSS_COMPILER_PREFIX),"arm-linux-androideabi-")
Denis Vlasenkodef88982007-10-07 17:06:01 +0000101LDLIBS += m crypt
Denys Vlasenkoe0894f52011-09-09 18:00:44 +0200102else
103# Android libc has no crypt. TODO: make a generic CONFIG_LINK_WITH_CRYPT option?
104LDLIBS += m
105endif
Denis Vlasenkod6e81c72007-08-21 10:58:18 +0000106
Rob Walkerbf634372012-03-07 12:25:53 +0100107ifneq ($(CONFIG_SYSROOT),)
108CFLAGS += --sysroot=$(CONFIG_SYSROOT)
109export SYSROOT=$(CONFIG_SYSROOT)
110endif
111
Denis Vlasenkod6e81c72007-08-21 10:58:18 +0000112ifeq ($(CONFIG_PAM),y)
Tristan Schmelcher5560e1a2011-12-05 04:38:58 +0100113# libpam uses libpthread, so for static builds busybox must be linked to
114# libpthread. On some platforms that requires an explicit -lpthread, so
115# it should be in LDLIBS. For non-static builds, scripts/trylink will
116# take care of removing -lpthread if possible. (Not bothering to check
117# CONFIG_STATIC because even in a non-static build it could be that the
118# only libpam available is libpam.a, so -lpthread could still be
119# needed.)
120LDLIBS += pam pam_misc pthread
Denis Vlasenkod6e81c72007-08-21 10:58:18 +0000121endif
122
Denis Vlasenkod46d3c22007-02-06 19:28:50 +0000123ifeq ($(CONFIG_SELINUX),y)
Denis Vlasenko76a6b232007-10-07 17:05:42 +0000124LDLIBS += selinux sepol
Denis Vlasenkod46d3c22007-02-06 19:28:50 +0000125endif
Bernhard Reutner-Fischer58a275b2007-03-28 15:00:27 +0000126
127ifeq ($(CONFIG_EFENCE),y)
Denis Vlasenko76a6b232007-10-07 17:05:42 +0000128LDLIBS += efence
Bernhard Reutner-Fischer58a275b2007-03-28 15:00:27 +0000129endif
130
131ifeq ($(CONFIG_DMALLOC),y)
Denis Vlasenko76a6b232007-10-07 17:05:42 +0000132LDLIBS += dmalloc
Bernhard Reutner-Fischer58a275b2007-03-28 15:00:27 +0000133endif
134
Mike Frysingerdec37b32009-03-12 07:56:49 +0000135# If a flat binary should be built, CFLAGS_busybox="-elf2flt"
Denis Vlasenko401de642008-06-06 16:11:12 +0000136# env var should be set for make invocation.
137# Here we check whether CFLAGS_busybox indeed contains that flag.
138# (For historical reasons, we also check LDFLAGS, which doesn't
Mike Frysingerdec37b32009-03-12 07:56:49 +0000139# seem to be entirely correct variable to put "-elf2flt" into).
140W_ELF2FLT = -elf2flt
Denis Vlasenko401de642008-06-06 16:11:12 +0000141ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox)))
Mike Frysinger5b5bcf22007-06-19 15:58:02 +0000142SKIP_STRIP = y
143endif
144
Rob Walkerbf634372012-03-07 12:25:53 +0100145ifneq ($(CONFIG_EXTRA_LDFLAGS),)
146EXTRA_LDFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_LDFLAGS)))
147#"))
148endif
149
150ifneq ($(CONFIG_EXTRA_LDLIBS),)
151LDLIBS += $(strip $(subst ",,$(CONFIG_EXTRA_LDLIBS)))
152#"))
153endif
154
Mike Frysingerc7b10dc2007-04-05 21:10:59 +0000155# Busybox is a stack-fatty so make sure we increase default size
Denis Vlasenko931de892007-06-21 12:43:45 +0000156# TODO: use "make stksizes" to find & fix big stack users
157# (we stole scripts/checkstack.pl from the kernel... thanks guys!)
Denis Vlasenkofcfb5c02007-12-24 12:16:24 +0000158# Reduced from 20k to 16k in 1.9.0.
159FLTFLAGS += -s 16000