| # ========================================================================== |
| # 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,-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,) |
| 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,-Os -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,) |
| |
| ifeq ($(CONFIG_DEBUG),y) |
| CFLAGS += $(call cc-option,-g) |
| endif |
| |
| # If arch/$(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) |
| # No switch() jump tables. Code growth +1k, binary size down -12k |
| # due to reduced number of code pointers. |
| # (TODO: make overridable: some arches may want to not do this) |
| CFLAGS += $(call cc-option,-fno-jump-tables) |
| endif |
| |
| LDLIBS += m crypt |
| |
| ifeq ($(CONFIG_PAM),y) |
| LDLIBS += pam pam_misc |
| endif |
| |
| ifeq ($(CONFIG_SELINUX),y) |
| LDLIBS += selinux sepol |
| endif |
| |
| ifeq ($(CONFIG_EFENCE),y) |
| LDLIBS += efence |
| endif |
| |
| ifeq ($(CONFIG_DMALLOC),y) |
| LDLIBS += dmalloc |
| endif |
| |
| LDFLAGS_ELF2FLT = -Wl,-elf2flt |
| ifneq (,$(findstring $(LDFLAGS_ELF2FLT),$(LDFLAGS))) |
| 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 |