5560e1af0a
Signed-off-by: Tristan Schmelcher <tristan_schmelcher@alumni.uwaterloo.ca> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
145 lines
5.0 KiB
Makefile
145 lines
5.0 KiB
Makefile
# ==========================================================================
|
|
# Build system
|
|
# ==========================================================================
|
|
|
|
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 += \
|
|
-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
|
|
|
|
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,)
|
|
# 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_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,)
|
|
|
|
# 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/$(ARCH)/Makefile did not override it (with, say, -fPIC)...
|
|
ARCH_FPIC ?= -fpic
|
|
ARCH_FPIE ?= -fpie
|
|
ARCH_PIE ?= -pie
|
|
|
|
ifeq ($(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
|
|
endif
|
|
|
|
ifeq ($(CONFIG_PIE),y)
|
|
CFLAGS_busybox += $(ARCH_PIE)
|
|
CFLAGS += $(ARCH_FPIE)
|
|
endif
|
|
|
|
ifneq ($(CONFIG_EXTRA_CFLAGS),)
|
|
CFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_CFLAGS)))
|
|
#"))
|
|
endif
|
|
|
|
ifneq ($(CONFIG_CROSS_COMPILER_PREFIX),"arm-linux-androideabi-")
|
|
LDLIBS += m crypt
|
|
else
|
|
# Android libc has no crypt. TODO: make a generic CONFIG_LINK_WITH_CRYPT option?
|
|
LDLIBS += m
|
|
endif
|
|
|
|
ifeq ($(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 ($(CONFIG_SELINUX),y)
|
|
LDLIBS += selinux sepol
|
|
endif
|
|
|
|
ifeq ($(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
|
|
|
|
# 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
|