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- # ==========================================================================
- # Build system
- # ==========================================================================
- BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
- export BB_VER
- SKIP_STRIP = n
- # -std=gnu99 needed for [U]LLONG_MAX on some systems
- CPPFLAGS += $(call cc-option,-std=gnu99,)
- CPPFLAGS += \
- -Iinclude -Ilibbb \
- $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include -I$(srctree)/libbb) \
- -include include/autoconf.h \
- -D_GNU_SOURCE -DNDEBUG \
- $(if $(CONFIG_LFS),-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64) \
- -D"BB_VER=KBUILD_STR($(BB_VER))" -DBB_BT=AUTOCONF_TIMESTAMP
- CFLAGS += $(call cc-option,-Wall,)
- CFLAGS += $(call cc-option,-Wshadow,)
- CFLAGS += $(call cc-option,-Wwrite-strings,)
- CFLAGS += $(call cc-option,-Wundef,)
- CFLAGS += $(call cc-option,-Wstrict-prototypes,)
- CFLAGS += $(call cc-option,-Wunused -Wunused-parameter,)
- CFLAGS += $(call cc-option,-Wunused-function -Wunused-value,)
- CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
- # warn about C99 declaration after statement
- CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
- # If you want to add more -Wsomething above, make sure that it is
- # still possible to build bbox without warnings.
- ifeq ($(CONFIG_WERROR),y)
- CFLAGS += $(call cc-option,-Werror,)
- ## TODO:
- ## gcc version 4.4.0 20090506 (Red Hat 4.4.0-4) (GCC) is a PITA:
- ## const char *ptr; ... off_t v = *(off_t*)ptr; -> BOOM
- ## and no easy way to convince it to shut the hell up.
- ## We have a lot of such things all over the place.
- ## Classic *(off_t*)(void*)ptr does not work,
- ## and I am unwilling to do crazy gcc specific ({ void *ppp = ...; })
- ## stuff in macros. This would obfuscate the code too much.
- ## Maybe try __attribute__((__may_alias__))?
- #CFLAGS += $(call cc-ifversion, -eq, 0404, -fno-strict-aliasing)
- endif
- # gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
- CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
- CFLAGS += $(call cc-option,-fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
- # -fno-guess-branch-probability: prohibit pseudo-random guessing
- # of branch probabilities (hopefully makes bloatcheck more stable):
- CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
- CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
- CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
- # FIXME: These warnings are at least partially to be concerned about and should
- # be fixed..
- #CFLAGS += $(call cc-option,-Wconversion,)
- ifneq ($(CONFIG_DEBUG),y)
- CFLAGS += $(call cc-option,-Os,)
- else
- CFLAGS += $(call cc-option,-g,)
- #CFLAGS += "-D_FORTIFY_SOURCE=2"
- ifeq ($(CONFIG_DEBUG_PESSIMIZE),y)
- CFLAGS += $(call cc-option,-O0,)
- else
- CFLAGS += $(call cc-option,-Os,)
- endif
- endif
- # If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)...
- ARCH_FPIC ?= -fpic
- ARCH_FPIE ?= -fpie
- ARCH_PIE ?= -pie
- ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
- # on i386: 14% smaller libbusybox.so
- # (code itself is 9% bigger, we save on relocs/PLT/GOT)
- CFLAGS += $(ARCH_FPIC)
- # and another 4% reduction of libbusybox.so:
- # (external entry points must be marked EXTERNALLY_VISIBLE)
- CFLAGS += $(call cc-option,-fvisibility=hidden)
- endif
- ifeq ($(CONFIG_STATIC),y)
- CFLAGS_busybox += -static
- endif
- ifeq ($(CONFIG_PIE),y)
- CFLAGS_busybox += $(ARCH_PIE)
- CFLAGS += $(ARCH_FPIE)
- endif
- ifneq ($(CONFIG_EXTRA_CFLAGS),)
- CFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_CFLAGS)))
- #"))
- endif
- LDLIBS += m crypt
- ifeq ($(CONFIG_PAM),y)
- LDLIBS += pam pam_misc
- endif
- ifeq ($(CONFIG_SELINUX),y)
- LDLIBS += selinux sepol
- endif
- ifeq ($(CONFIG_EFENCE),y)
- LDLIBS += efence
- endif
- ifeq ($(CONFIG_DMALLOC),y)
- LDLIBS += dmalloc
- endif
- # If a flat binary should be built, CFLAGS_busybox="-elf2flt"
- # env var should be set for make invocation.
- # Here we check whether CFLAGS_busybox indeed contains that flag.
- # (For historical reasons, we also check LDFLAGS, which doesn't
- # seem to be entirely correct variable to put "-elf2flt" into).
- W_ELF2FLT = -elf2flt
- ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox)))
- SKIP_STRIP = y
- endif
- # Busybox is a stack-fatty so make sure we increase default size
- # TODO: use "make stksizes" to find & fix big stack users
- # (we stole scripts/checkstack.pl from the kernel... thanks guys!)
- # Reduced from 20k to 16k in 1.9.0.
- FLTFLAGS += -s 16000
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