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bb2fd67d0b
Static build with CONFIG_PAM fails on Debian Jessie due to undefined references to libdl and libaudit. Static build without pam, but with libcrypt required fails as well due to undefined references to libpthread. Fix these two cases by adding the missing libraries to LDLIBS when appropriate. Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
180 lines
6.4 KiB
Makefile
180 lines
6.4 KiB
Makefile
# ==========================================================================
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# Build system
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# ==========================================================================
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BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
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export BB_VER
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SKIP_STRIP ?= n
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# -std=gnu99 needed for [U]LLONG_MAX on some systems
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CPPFLAGS += $(call cc-option,-std=gnu99,)
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CPPFLAGS += \
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-Iinclude -Ilibbb \
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$(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include -I$(srctree)/libbb) \
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-include include/autoconf.h \
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-D_GNU_SOURCE -DNDEBUG \
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$(if $(CONFIG_LFS),-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64) \
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-D"BB_VER=KBUILD_STR($(BB_VER))" -DBB_BT=AUTOCONF_TIMESTAMP
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CFLAGS += $(call cc-option,-Wall,)
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CFLAGS += $(call cc-option,-Wshadow,)
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CFLAGS += $(call cc-option,-Wwrite-strings,)
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CFLAGS += $(call cc-option,-Wundef,)
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CFLAGS += $(call cc-option,-Wstrict-prototypes,)
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CFLAGS += $(call cc-option,-Wunused -Wunused-parameter,)
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CFLAGS += $(call cc-option,-Wunused-function -Wunused-value,)
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CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
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CFLAGS += $(call cc-option,-Wno-format-security,)
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# warn about C99 declaration after statement
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CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
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# If you want to add more -Wsomething above, make sure that it is
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# still possible to build bbox without warnings.
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ifeq ($(CONFIG_WERROR),y)
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CFLAGS += $(call cc-option,-Werror,)
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## TODO:
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## gcc version 4.4.0 20090506 (Red Hat 4.4.0-4) (GCC) is a PITA:
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## const char *ptr; ... off_t v = *(off_t*)ptr; -> BOOM
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## and no easy way to convince it to shut the hell up.
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## We have a lot of such things all over the place.
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## Classic *(off_t*)(void*)ptr does not work,
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## and I am unwilling to do crazy gcc specific ({ void *ppp = ...; })
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## stuff in macros. This would obfuscate the code too much.
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## Maybe try __attribute__((__may_alias__))?
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#CFLAGS += $(call cc-ifversion, -eq, 0404, -fno-strict-aliasing)
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endif
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# gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
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CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
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CFLAGS += $(call cc-option,-fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
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# -fno-guess-branch-probability: prohibit pseudo-random guessing
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# of branch probabilities (hopefully makes bloatcheck more stable):
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CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
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CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
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CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
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# Defeat .eh_frame bloat (gcc 4.6.3 x86-32 defconfig: 20% smaller busybox binary):
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CFLAGS += $(call cc-option,-fno-unwind-tables,)
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CFLAGS += $(call cc-option,-fno-asynchronous-unwind-tables,)
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# FIXME: These warnings are at least partially to be concerned about and should
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# be fixed..
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#CFLAGS += $(call cc-option,-Wconversion,)
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ifneq ($(CONFIG_DEBUG),y)
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CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,))
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else
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CFLAGS += $(call cc-option,-g,)
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#CFLAGS += "-D_FORTIFY_SOURCE=2"
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ifeq ($(CONFIG_DEBUG_PESSIMIZE),y)
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CFLAGS += $(call cc-option,-O0,)
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else
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CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,))
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endif
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endif
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# If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)...
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ARCH_FPIC ?= -fpic
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ARCH_FPIE ?= -fpie
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ARCH_PIE ?= -pie
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# Usage: $(eval $(call pkg_check_modules,VARIABLE-PREFIX,MODULES))
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define pkg_check_modules
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$(1)_CFLAGS := $(shell $(PKG_CONFIG) $(PKG_CONFIG_FLAGS) --cflags $(2))
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$(1)_LIBS := $(shell $(PKG_CONFIG) $(PKG_CONFIG_FLAGS) --libs $(2))
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endef
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ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
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# on i386: 14% smaller libbusybox.so
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# (code itself is 9% bigger, we save on relocs/PLT/GOT)
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CFLAGS += $(ARCH_FPIC)
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# and another 4% reduction of libbusybox.so:
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# (external entry points must be marked EXTERNALLY_VISIBLE)
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CFLAGS += $(call cc-option,-fvisibility=hidden)
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endif
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ifeq ($(CONFIG_STATIC),y)
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CFLAGS_busybox += -static
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PKG_CONFIG_FLAGS += --static
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endif
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ifeq ($(CONFIG_PIE),y)
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CFLAGS_busybox += $(ARCH_PIE)
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CFLAGS += $(ARCH_FPIE)
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endif
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ifneq ($(CONFIG_EXTRA_CFLAGS),)
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CFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_CFLAGS)))
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#"))
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endif
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# Note: both "" (string consisting of two quote chars) and empty string
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# are possible, and should be skipped below.
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ifneq ($(subst "",,$(CONFIG_SYSROOT)),)
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CFLAGS += --sysroot=$(CONFIG_SYSROOT)
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export SYSROOT=$(CONFIG_SYSROOT)
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endif
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# Android has no separate crypt library
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# gcc-4.2.1 fails if we try to feed C source on stdin:
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# echo 'int main(void){return 0;}' | $(CC) $(CFLAGS) -lcrypt -o /dev/null -xc -
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# fall back to using a temp file:
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CRYPT_AVAILABLE := $(shell echo 'int main(void){return 0;}' >crypttest.c; $(CC) $(CFLAGS) -lcrypt -o /dev/null crypttest.c >/dev/null 2>&1 && echo "y"; rm crypttest.c)
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ifeq ($(CRYPT_AVAILABLE),y)
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LDLIBS += m crypt pthread
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else
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LDLIBS += m
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endif
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ifeq ($(CONFIG_PAM),y)
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# libpam uses libpthread, libdl and libaudit, so for static builds busybox
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# must be linked to libpthread, libdl and libaudit. On some platforms that
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# requires an explicit -lpthread, -ldl and -laudit, so it should be in
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# LDLIBS. For non-static builds, scripts/trylink will take care of removing
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# these flags if possible. (Not bothering to check CONFIG_STATIC because
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# even in a non-static build it could be that the only libpam available is
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# libpam.a, so -lpthread & Co. could still be needed.)
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LDLIBS += pam pam_misc pthread dl audit
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endif
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ifeq ($(CONFIG_SELINUX),y)
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SELINUX_PC_MODULES = libselinux libsepol
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$(eval $(call pkg_check_modules,SELINUX,$(SELINUX_PC_MODULES)))
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CPPFLAGS += $(SELINUX_CFLAGS)
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LDLIBS += $(if $(SELINUX_LIBS),$(SELINUX_LIBS:-l%=%),$(SELINUX_PC_MODULES:lib%=%))
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endif
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ifeq ($(CONFIG_EFENCE),y)
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LDLIBS += efence
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endif
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ifeq ($(CONFIG_DMALLOC),y)
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LDLIBS += dmalloc
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endif
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# If a flat binary should be built, CFLAGS_busybox="-elf2flt"
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# env var should be set for make invocation.
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# Here we check whether CFLAGS_busybox indeed contains that flag.
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# (For historical reasons, we also check LDFLAGS, which doesn't
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# seem to be entirely correct variable to put "-elf2flt" into).
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W_ELF2FLT = -elf2flt
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ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox)))
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SKIP_STRIP = y
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endif
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ifneq ($(CONFIG_EXTRA_LDFLAGS),)
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LDFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_LDFLAGS)))
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#"))
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endif
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ifneq ($(CONFIG_EXTRA_LDLIBS),)
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LDLIBS += $(strip $(subst ",,$(CONFIG_EXTRA_LDLIBS)))
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#"))
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endif
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# Busybox is a stack-fatty so make sure we increase default size
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# TODO: use "make stksizes" to find & fix big stack users
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# (we stole scripts/checkstack.pl from the kernel... thanks guys!)
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# Reduced from 20k to 16k in 1.9.0.
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FLTFLAGS += -s 16000
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