1 # ==========================================================================
3 # ==========================================================================
5 BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
9 # -std=gnu99 needed for [U]LLONG_MAX on some systems
10 CPPFLAGS += $(call cc-option,-std=gnu99,)
14 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include -I$(srctree)/libbb) \
15 -include include/autoconf.h \
16 -D_GNU_SOURCE -DNDEBUG \
17 $(if $(CONFIG_LFS),-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64) \
18 -D"BB_VER=KBUILD_STR($(BB_VER))" -DBB_BT=AUTOCONF_TIMESTAMP
20 CFLAGS += $(call cc-option,-Wall,)
21 CFLAGS += $(call cc-option,-Wshadow,)
22 CFLAGS += $(call cc-option,-Wwrite-strings,)
23 CFLAGS += $(call cc-option,-Wundef,)
24 CFLAGS += $(call cc-option,-Wstrict-prototypes,)
25 CFLAGS += $(call cc-option,-Wunused -Wunused-parameter,)
26 CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
27 # warn about C99 declaration after statement
28 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
29 # If you want to add more -Wsomething above, make sure that it is
30 # still possible to build bbox without warnings.
32 ifeq ($(CONFIG_WERROR),y)
33 CFLAGS += $(call cc-option,-Werror,)
35 # gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
36 CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
38 CFLAGS += $(call cc-option,-Os -fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
39 # -fno-guess-branch-probability: prohibit pseudo-random guessing
40 # of branch probabilities (hopefully makes bloatcheck more stable):
41 CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
42 CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
43 CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
45 # FIXME: These warnings are at least partially to be concerned about and should
47 #CFLAGS+=$(call cc-option,-Wconversion,)
49 ifeq ($(CONFIG_DEBUG),y)
50 CFLAGS += $(call cc-option,-g)
53 ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
54 # on i386: 14% smaller libbusybox.so
55 # (code itself is 9% bigger, we save on relocs/PLT/GOT)
57 # and another 4% reduction of libbusybox.so:
58 # (external entry points must be marked EXTERNALLY_VISIBLE)
59 CFLAGS += $(call cc-option,-fvisibility=hidden)
62 ifeq ($(CONFIG_STATIC),y)
68 ifeq ($(CONFIG_PAM),y)
69 LDLIBS += pam pam_misc
72 ifeq ($(CONFIG_SELINUX),y)
73 LDLIBS += selinux sepol
76 ifeq ($(CONFIG_EFENCE),y)
80 ifeq ($(CONFIG_DMALLOC),y)
86 LDFLAGS_ELF2FLT = -Wl,-elf2flt
87 ifneq (,$(findstring $(LDFLAGS_ELF2FLT),$(LDFLAGS)))
91 # Busybox is a stack-fatty so make sure we increase default size
92 # TODO: use "make stksizes" to find & fix big stack users
93 # (we stole scripts/checkstack.pl from the kernel... thanks guys!)
94 # Reduced from 20k to 16k in 1.9.0.