X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=Makefile.flags;h=307afa7f521207de5defad823cd07c554b1c7102;hb=HEAD;hp=0261d34df500adbb1e51a4b041fd844fee5eff78;hpb=9729e65706f46bd04d6e5946e20bd3c7ff4d7cc3;p=platform%2Fupstream%2Fbusybox.git diff --git a/Makefile.flags b/Makefile.flags index 0261d34..307afa7 100644 --- a/Makefile.flags +++ b/Makefile.flags @@ -3,26 +3,177 @@ # ========================================================================== 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 += \ - -std=gnu99 \ -Iinclude -Ilibbb \ - $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) -I$(srctree)/libbb \ + $(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 += \ - -Wall -Wstrict-prototypes -Wshadow -Werror -Wundef \ - -funsigned-char -fno-builtin-strlen -finline-limit=0 -static-libgcc \ - -Os -falign-functions=1 -falign-jumps=1 -falign-loops=1 \ - -fomit-frame-pointer -ffunction-sections -fdata-sections +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,-Wunused-function -Wunused-value,) +CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,) +CFLAGS += $(call cc-option,-Wno-format-security,) +# 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_DEBUG),y) -CFLAGS += -g -LDFLAGS += -g +ifeq ($(CONFIG_WERROR),y) +CFLAGS += $(call cc-option,-Werror,) +## TODO: +## gcc version 4.4.0 20090506 (Red Hat 4.4.0-4) (GCC) is a PITA: +## const char *ptr; ... off_t v = *(off_t*)ptr; -> BOOM +## and no easy way to convince it to shut the hell up. +## We have a lot of such things all over the place. +## Classic *(off_t*)(void*)ptr does not work, +## and I am unwilling to do crazy gcc specific ({ void *ppp = ...; }) +## stuff in macros. This would obfuscate the code too much. +## Maybe try __attribute__((__may_alias__))? +#CFLAGS += $(call cc-ifversion, -eq, 0404, -fno-strict-aliasing) 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,-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,) +# Defeat .eh_frame bloat (gcc 4.6.3 x86-32 defconfig: 20% smaller busybox binary): +CFLAGS += $(call cc-option,-fno-unwind-tables,) +CFLAGS += $(call cc-option,-fno-asynchronous-unwind-tables,) + +# FIXME: These warnings are at least partially to be concerned about and should +# be fixed.. +#CFLAGS += $(call cc-option,-Wconversion,) + +ifneq ($(CONFIG_DEBUG),y) +CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,)) +else +CFLAGS += $(call cc-option,-g,) +#CFLAGS += "-D_FORTIFY_SOURCE=2" +ifeq ($(CONFIG_DEBUG_PESSIMIZE),y) +CFLAGS += $(call cc-option,-O0,) +else +CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,)) +endif +endif + +# If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)... +ARCH_FPIC ?= -fpic +ARCH_FPIE ?= -fpie +ARCH_PIE ?= -pie + +# Usage: $(eval $(call pkg_check_modules,VARIABLE-PREFIX,MODULES)) +define pkg_check_modules +$(1)_CFLAGS := $(shell $(PKG_CONFIG) $(PKG_CONFIG_FLAGS) --cflags $(2)) +$(1)_LIBS := $(shell $(PKG_CONFIG) $(PKG_CONFIG_FLAGS) --libs $(2)) +endef + +ifeq ($(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 +PKG_CONFIG_FLAGS += --static +endif + +ifeq ($(CONFIG_PIE),y) +CFLAGS_busybox += $(ARCH_PIE) +CFLAGS += $(ARCH_FPIE) +endif + +ifneq ($(CONFIG_EXTRA_CFLAGS),) +CFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_CFLAGS))) +#")) +endif + +# Note: both "" (string consisting of two quote chars) and empty string +# are possible, and should be skipped below. +ifneq ($(subst "",,$(CONFIG_SYSROOT)),) +CFLAGS += --sysroot=$(CONFIG_SYSROOT) +export SYSROOT=$(CONFIG_SYSROOT) +endif + +# Android has no separate crypt library +# gcc-4.2.1 fails if we try to feed C source on stdin: +# echo 'int main(void){return 0;}' | $(CC) $(CFLAGS) -lcrypt -o /dev/null -xc - +# fall back to using a temp file: +CRYPT_AVAILABLE := $(shell echo 'int main(void){return 0;}' >crypttest.c; $(CC) $(CFLAGS) -lcrypt -o /dev/null crypttest.c >/dev/null 2>&1 && echo "y"; rm crypttest.c) +ifeq ($(CRYPT_AVAILABLE),y) +LDLIBS += m crypt +else +LDLIBS += m +endif + +ifeq ($(CONFIG_PAM),y) +# libpam uses libpthread, so for static builds busybox must be linked to +# libpthread. On some platforms that requires an explicit -lpthread, so +# it should be in LDLIBS. For non-static builds, scripts/trylink will +# take care of removing -lpthread if possible. (Not bothering to check +# CONFIG_STATIC because even in a non-static build it could be that the +# only libpam available is libpam.a, so -lpthread could still be +# needed.) +LDLIBS += pam pam_misc pthread +endif + +ifeq ($(CONFIG_SELINUX),y) +SELINUX_PC_MODULES = libselinux libsepol +$(eval $(call pkg_check_modules,SELINUX,$(SELINUX_PC_MODULES))) +CPPFLAGS += $(SELINUX_CFLAGS) +LDLIBS += $(if $(SELINUX_LIBS),$(SELINUX_LIBS:-l%=%),$(SELINUX_PC_MODULES:lib%=%)) +endif + +ifeq ($(CONFIG_EFENCE),y) +LDLIBS += efence +endif + +ifeq ($(CONFIG_DMALLOC),y) +LDLIBS += dmalloc +endif + +# If a flat binary should be built, CFLAGS_busybox="-elf2flt" +# env var should be set for make invocation. +# Here we check whether CFLAGS_busybox indeed contains that flag. +# (For historical reasons, we also check LDFLAGS, which doesn't +# seem to be entirely correct variable to put "-elf2flt" into). +W_ELF2FLT = -elf2flt +ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox))) +SKIP_STRIP = y +endif + +ifneq ($(CONFIG_EXTRA_LDFLAGS),) +EXTRA_LDFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_LDFLAGS))) +#")) +endif + +ifneq ($(CONFIG_EXTRA_LDLIBS),) +LDLIBS += $(strip $(subst ",,$(CONFIG_EXTRA_LDLIBS))) +#")) +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