busybox/Makefile.flags
Denis Vlasenko e8a0788b24 moved biggest stack buffers to malloc space, or made their size configurable
(8k of shell line edit buffer is an overkill)

# make ARCH=i386 bloatcheck
function                                             old     new   delta
read_line_input                                     3933    3967     +34
ifaddrlist                                           348     345      -3
do_loadfont                                          208     191     -17
edit_file                                            840     819     -21
.rodata                                           129112  129080     -32
uncompress                                          1305    1268     -37
loadfont_main                                        566     495     -71
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/6 up/down: 34/-181)          Total: -147 bytes
2007-06-10 15:08:44 +00:00

75 lines
2.6 KiB
Makefile

# ==========================================================================
# Build system
# ==========================================================================
BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
# -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
# flag checks are grouped together to speed the checks up a bit..
CFLAGS += $(call cc-option,-Wall -Wshadow -Wwrite-strings,)
CFLAGS += $(call cc-option,-Wundef -Wstrict-prototypes,)
# If you want to add "-Wmissing-prototypes -Wmissing-declarations" above
# (or anything else for that matter) make sure that it is still possible
# to build bbox without warnings. Current offender: find.c:alloc_action().
# Looks more like gcc bug: gcc will warn on it with or without prototype.
# But still, warning-free compile is a must, or else we will drown
# in warnings pretty soon.
ifeq ($(CONFIG_WERROR),y)
CFLAGS += $(call cc-option,-Werror,)
endif
# gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
# gcc emits bogus "no prev proto" warning on find.c:alloc_action()
ifneq ($(CONFIG_WERROR),y)
CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
endif
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 += $(call cc-option,-g)
endif
ifeq ($(CONFIG_STATIC),y)
LDFLAGS += -static
endif
ifeq ($(CONFIG_SELINUX),y)
LDLIBS += -lselinux -lsepol
endif
ifeq ($(CONFIG_EFENCE),y)
LDLIBS += -lefence
endif
ifeq ($(CONFIG_DMALLOC),y)
LDLIBS += -ldmalloc
endif
#LDFLAGS += -nostdlib
# Busybox is a stack-fatty so make sure we increase default size
# (TODO: use "make stksizes" to find & fix big stack users)
FLTFLAGS += -s 20000