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# ==========================================================================
# 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 += $(call cc-option,-Wall -Wshadow,)
ifeq ($(CONFIG_WERROR),y)
CFLAGS += $(call cc-option,-Werror,)
endif
CFLAGS += $(call cc-option,-Wundef -Wold-style-definition -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations,)
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,-funsigned-char -fno-guess-branch-probability -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
#LDFLAGS += -nostdlib
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