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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)
Mike Frysinger5b5bcf22007-06-19 15:58:02 +00006SKIP_STRIP = n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00007
Denis Vlasenkobf11e892006-11-26 22:17:46 +00008# -std=gnu99 needed for [U]LLONG_MAX on some systems
Bernhard Reutner-Fischer82f87882007-01-23 11:39:13 +00009CPPFLAGS += $(call cc-option,-std=gnu99,)
Denis Vlasenko9dca07d2007-01-27 14:03:15 +000010
Denis Vlasenko7039a662006-10-08 17:54:47 +000011CPPFLAGS += \
12 -Iinclude -Ilibbb \
13 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) -I$(srctree)/libbb \
14 -include include/autoconf.h \
15 -D_GNU_SOURCE -DNDEBUG \
16 $(if $(CONFIG_LFS),-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64) \
Bernhard Reutner-Fischerfeea1b92006-12-06 21:51:59 +000017 -D"BB_VER=KBUILD_STR($(BB_VER))" -DBB_BT=AUTOCONF_TIMESTAMP
18
Bernhard Reutner-Fischer82f87882007-01-23 11:39:13 +000019# flag checks are grouped together to speed the checks up a bit..
Denis Vlasenko4bb31892007-02-01 01:51:36 +000020CFLAGS += $(call cc-option,-Wall -Wshadow -Wwrite-strings,)
Denis Vlasenkoc562bb72007-01-29 17:08:51 +000021CFLAGS += $(call cc-option,-Wundef -Wstrict-prototypes,)
Denis Vlasenko9dca07d2007-01-27 14:03:15 +000022# If you want to add "-Wmissing-prototypes -Wmissing-declarations" above
23# (or anything else for that matter) make sure that it is still possible
24# to build bbox without warnings. Current offender: find.c:alloc_action().
25# Looks more like gcc bug: gcc will warn on it with or without prototype.
26# But still, warning-free compile is a must, or else we will drown
27# in warnings pretty soon.
Denis Vlasenkoc562bb72007-01-29 17:08:51 +000028
Denis Vlasenko4bb31892007-02-01 01:51:36 +000029ifeq ($(CONFIG_WERROR),y)
30CFLAGS += $(call cc-option,-Werror,)
Bernhard Reutner-Fischerb7e61482007-06-21 10:28:11 +000031else
32# for development, warn a little bit about unused results..
33CPPFLAGS += -D_FORTIFY_SOURCE=2
Denis Vlasenko4bb31892007-02-01 01:51:36 +000034endif
Denis Vlasenkoc562bb72007-01-29 17:08:51 +000035# gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
36CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
37
38# gcc emits bogus "no prev proto" warning on find.c:alloc_action()
Denis Vlasenko9dca07d2007-01-27 14:03:15 +000039ifneq ($(CONFIG_WERROR),y)
40CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
41endif
Denis Vlasenkoc562bb72007-01-29 17:08:51 +000042
Bernhard Reutner-Fischer82f87882007-01-23 11:39:13 +000043CFLAGS += $(call cc-option,-Os -fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
Denis Vlasenkoe0eebc12007-01-27 13:44:53 +000044# -fno-guess-branch-probability: prohibit pseudo-random guessing
Denis Vlasenko9dca07d2007-01-27 14:03:15 +000045# of branch probabilities (hopefully makes bloatcheck more stable):
46CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
47CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
Denis Vlasenkoe0eebc12007-01-27 13:44:53 +000048CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
Bernhard Reutner-Fischer82f87882007-01-23 11:39:13 +000049
Bernhard Reutner-Fischerfdcd7c42007-01-22 17:50:21 +000050# FIXME: These warnings are at least partially to be concerned about and should
51# be fixed..
Bernhard Reutner-Fischer82f87882007-01-23 11:39:13 +000052#CFLAGS+=$(call cc-option,-Wconversion,)
Bernhard Reutner-Fischer9729e652006-12-13 17:44:24 +000053
54ifeq ($(CONFIG_DEBUG),y)
Bernhard Reutner-Fischer82f87882007-01-23 11:39:13 +000055CFLAGS += $(call cc-option,-g)
Bernhard Reutner-Fischer9729e652006-12-13 17:44:24 +000056endif
57
Bernhard Reutner-Fischerc1feac62007-01-08 16:29:15 +000058ifeq ($(CONFIG_STATIC),y)
59LDFLAGS += -static
60endif
Denis Vlasenkod46d3c22007-02-06 19:28:50 +000061
62ifeq ($(CONFIG_SELINUX),y)
Mike Frysinger52a9db62007-03-30 05:44:15 +000063LDLIBS += -lselinux -lsepol
Denis Vlasenkod46d3c22007-02-06 19:28:50 +000064endif
Bernhard Reutner-Fischer58a275b2007-03-28 15:00:27 +000065
66ifeq ($(CONFIG_EFENCE),y)
Mike Frysinger52a9db62007-03-30 05:44:15 +000067LDLIBS += -lefence
Bernhard Reutner-Fischer58a275b2007-03-28 15:00:27 +000068endif
69
70ifeq ($(CONFIG_DMALLOC),y)
Mike Frysinger52a9db62007-03-30 05:44:15 +000071LDLIBS += -ldmalloc
Bernhard Reutner-Fischer58a275b2007-03-28 15:00:27 +000072endif
73
Bernhard Reutner-Fischerd6c23ae2007-01-08 16:38:33 +000074#LDFLAGS += -nostdlib
Mike Frysingerc7b10dc2007-04-05 21:10:59 +000075
Mike Frysinger5b5bcf22007-06-19 15:58:02 +000076LDFLAGS_ELF2FLT = -Wl,-elf2flt
77ifneq (,$(findstring $(LDFLAGS_ELF2FLT),$(LDFLAGS)))
78SKIP_STRIP = y
79endif
80
Mike Frysingerc7b10dc2007-04-05 21:10:59 +000081# Busybox is a stack-fatty so make sure we increase default size
Denis Vlasenko931de892007-06-21 12:43:45 +000082# TODO: use "make stksizes" to find & fix big stack users
83# (we stole scripts/checkstack.pl from the kernel... thanks guys!)
Mike Frysingerc7b10dc2007-04-05 21:10:59 +000084FLTFLAGS += -s 20000