109 lines
3.5 KiB
Makefile
109 lines
3.5 KiB
Makefile
# ==========================================================================
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# Build system
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# ==========================================================================
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BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
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export BB_VER
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SKIP_STRIP = n
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# -std=gnu99 needed for [U]LLONG_MAX on some systems
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CPPFLAGS += $(call cc-option,-std=gnu99,)
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CPPFLAGS += \
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-Iinclude -Ilibbb \
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$(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include -I$(srctree)/libbb) \
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-include include/autoconf.h \
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-D_GNU_SOURCE -DNDEBUG \
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$(if $(CONFIG_LFS),-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64) \
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-D"BB_VER=KBUILD_STR($(BB_VER))" -DBB_BT=AUTOCONF_TIMESTAMP
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CFLAGS += $(call cc-option,-Wall,)
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CFLAGS += $(call cc-option,-Wshadow,)
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CFLAGS += $(call cc-option,-Wwrite-strings,)
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CFLAGS += $(call cc-option,-Wundef,)
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CFLAGS += $(call cc-option,-Wstrict-prototypes,)
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CFLAGS += $(call cc-option,-Wunused -Wunused-parameter,)
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CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
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# warn about C99 declaration after statement
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CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
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# If you want to add more -Wsomething above, make sure that it is
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# still possible to build bbox without warnings.
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ifeq ($(CONFIG_WERROR),y)
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CFLAGS += $(call cc-option,-Werror,)
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endif
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# gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
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CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
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CFLAGS += $(call cc-option,-Os -fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
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# -fno-guess-branch-probability: prohibit pseudo-random guessing
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# of branch probabilities (hopefully makes bloatcheck more stable):
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CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
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CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
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CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
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# FIXME: These warnings are at least partially to be concerned about and should
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# be fixed..
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#CFLAGS+=$(call cc-option,-Wconversion,)
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ifeq ($(CONFIG_DEBUG),y)
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CFLAGS += $(call cc-option,-g)
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endif
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# If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)...
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ARCH_FPIC ?= -fpic
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ARCH_FPIE ?= -fpie
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ARCH_PIE ?= -pie
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ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
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# on i386: 14% smaller libbusybox.so
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# (code itself is 9% bigger, we save on relocs/PLT/GOT)
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CFLAGS += $(ARCH_FPIC)
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# and another 4% reduction of libbusybox.so:
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# (external entry points must be marked EXTERNALLY_VISIBLE)
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CFLAGS += $(call cc-option,-fvisibility=hidden)
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endif
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ifeq ($(CONFIG_STATIC),y)
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CFLAGS_busybox += -static
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endif
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ifeq ($(CONFIG_PIE),y)
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CFLAGS_busybox += $(ARCH_PIE)
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CFLAGS += $(ARCH_FPIE)
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endif
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LDLIBS += m crypt
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ifeq ($(CONFIG_PAM),y)
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LDLIBS += pam pam_misc
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endif
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ifeq ($(CONFIG_SELINUX),y)
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LDLIBS += selinux sepol
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endif
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ifeq ($(CONFIG_EFENCE),y)
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LDLIBS += efence
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endif
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ifeq ($(CONFIG_DMALLOC),y)
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LDLIBS += dmalloc
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endif
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# If a flat binary should be built, CFLAGS_busybox="-Wl,-elf2flt"
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# env var should be set for make invocation.
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# Here we check whether CFLAGS_busybox indeed contains that flag.
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# (For historical reasons, we also check LDFLAGS, which doesn't
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# seem to be entirely correct variable to put "-Wl,-elf2flt" into).
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W_ELF2FLT = -Wl,-elf2flt
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ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox)))
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SKIP_STRIP = y
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endif
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# Busybox is a stack-fatty so make sure we increase default size
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# TODO: use "make stksizes" to find & fix big stack users
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# (we stole scripts/checkstack.pl from the kernel... thanks guys!)
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# Reduced from 20k to 16k in 1.9.0.
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FLTFLAGS += -s 16000
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