blob: 9de52d89a254fac6b1a61db2fde524c95a933953 [file] [log] [blame]
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001# ==========================================================================
Denis Vlasenkoda8f43f2006-10-09 19:47:38 +00002# Build system
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00003# ==========================================================================
4
5BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
6
Denis Vlasenkobf11e892006-11-26 22:17:46 +00007# -std=gnu99 needed for [U]LLONG_MAX on some systems
Bernhard Reutner-Fischer82f87882007-01-23 11:39:13 +00008CPPFLAGS += $(call cc-option,-std=gnu99,)
Denis Vlasenko9dca07d2007-01-27 14:03:15 +00009
Denis Vlasenko7039a662006-10-08 17:54:47 +000010CPPFLAGS += \
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 $(CONFIG_LFS),-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64) \
Bernhard Reutner-Fischerfeea1b92006-12-06 21:51:59 +000016 -D"BB_VER=KBUILD_STR($(BB_VER))" -DBB_BT=AUTOCONF_TIMESTAMP
17
Bernhard Reutner-Fischer82f87882007-01-23 11:39:13 +000018# flag checks are grouped together to speed the checks up a bit..
19CFLAGS += $(call cc-option,-Wall -Wshadow,)
Denis Vlasenkoe0eebc12007-01-27 13:44:53 +000020ifeq ($(CONFIG_WERROR),y)
21CFLAGS += $(call cc-option,-Werror,)
22endif
Denis Vlasenkoc562bb72007-01-29 17:08:51 +000023CFLAGS += $(call cc-option,-Wundef -Wstrict-prototypes,)
Denis Vlasenko9dca07d2007-01-27 14:03:15 +000024# If you want to add "-Wmissing-prototypes -Wmissing-declarations" above
25# (or anything else for that matter) make sure that it is still possible
26# to build bbox without warnings. Current offender: find.c:alloc_action().
27# Looks more like gcc bug: gcc will warn on it with or without prototype.
28# But still, warning-free compile is a must, or else we will drown
29# in warnings pretty soon.
Denis Vlasenkoc562bb72007-01-29 17:08:51 +000030
31# gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
32CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
33
34# gcc emits bogus "no prev proto" warning on find.c:alloc_action()
Denis Vlasenko9dca07d2007-01-27 14:03:15 +000035ifneq ($(CONFIG_WERROR),y)
36CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
37endif
Denis Vlasenkoc562bb72007-01-29 17:08:51 +000038
Bernhard Reutner-Fischer82f87882007-01-23 11:39:13 +000039CFLAGS += $(call cc-option,-Os -fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
Denis Vlasenkoe0eebc12007-01-27 13:44:53 +000040# -fno-guess-branch-probability: prohibit pseudo-random guessing
Denis Vlasenko9dca07d2007-01-27 14:03:15 +000041# of branch probabilities (hopefully makes bloatcheck more stable):
42CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
43CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
Denis Vlasenkoe0eebc12007-01-27 13:44:53 +000044CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
Bernhard Reutner-Fischer82f87882007-01-23 11:39:13 +000045
Bernhard Reutner-Fischerfdcd7c42007-01-22 17:50:21 +000046# FIXME: These warnings are at least partially to be concerned about and should
47# be fixed..
Bernhard Reutner-Fischer82f87882007-01-23 11:39:13 +000048#CFLAGS+=$(call cc-option,-Wconversion,)
Bernhard Reutner-Fischer9729e652006-12-13 17:44:24 +000049
50ifeq ($(CONFIG_DEBUG),y)
Bernhard Reutner-Fischer82f87882007-01-23 11:39:13 +000051CFLAGS += $(call cc-option,-g)
Bernhard Reutner-Fischer9729e652006-12-13 17:44:24 +000052endif
53
Bernhard Reutner-Fischerc1feac62007-01-08 16:29:15 +000054ifeq ($(CONFIG_STATIC),y)
55LDFLAGS += -static
56endif
Bernhard Reutner-Fischerd6c23ae2007-01-08 16:38:33 +000057#LDFLAGS += -nostdlib