- call cc-option to check if the compiler supports the flags we asked to use
[platform/upstream/busybox.git] / Makefile.flags
1 # ==========================================================================
2 # Build system
3 # ==========================================================================
4
5 BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
6
7 # -std=gnu99 needed for [U]LLONG_MAX on some systems
8
9 CPPFLAGS += $(call cc-option,-std=gnu99,)
10 CPPFLAGS += \
11         -Iinclude -Ilibbb \
12         $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) -I$(srctree)/libbb \
13         -include include/autoconf.h \
14         -D_GNU_SOURCE -DNDEBUG \
15         $(if $(CONFIG_LFS),-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64) \
16         -D"BB_VER=KBUILD_STR($(BB_VER))" -DBB_BT=AUTOCONF_TIMESTAMP
17
18 # flag checks are grouped together to speed the checks up a bit..
19 CFLAGS += $(call cc-option,-Wall -Wshadow,)
20 CFLAGS += $(call cc-option,-Wundef -Wold-style-definition -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations,)
21 CFLAGS += $(call cc-option,-Os -fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
22 CFLAGS += $(call cc-option,-static-libgcc -funsigned-char,)
23 CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-loops=1,)
24
25 # FIXME: These warnings are at least partially to be concerned about and should
26 # be fixed..
27 #CFLAGS+=$(call cc-option,-Wconversion,)
28
29 ifeq ($(CONFIG_DEBUG),y)
30 CFLAGS += $(call cc-option,-g)
31 endif
32
33 ifeq ($(CONFIG_STATIC),y)
34 LDFLAGS += -static
35 endif
36 #LDFLAGS += -nostdlib