-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
+ -D"BB_VER=KBUILD_STR($(BB_VER))"
CFLAGS += $(call cc-option,-Wall,)
CFLAGS += $(call cc-option,-Wshadow,)
# 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,)
+# No automatic printf->puts,putchar conversions
+# (try disabling this and comparing assembly, it's instructive)
+CFLAGS += $(call cc-option,-fno-builtin-printf,)
# FIXME: These warnings are at least partially to be concerned about and should
# be fixed..
CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,))
endif
endif
+ifeq ($(CONFIG_DEBUG_SANITIZE),y)
+CFLAGS += $(call cc-option,-fsanitize=address,)
+CFLAGS += $(call cc-option,-fsanitize=leak,)
+CFLAGS += $(call cc-option,-fsanitize=undefined,)
+endif
# If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)...
ARCH_FPIC ?= -fpic
LDLIBS += m
endif
-PTHREAD_AVAILABLE := $(shell echo 'int main(void){return 0;}' >pthreadtest.c; $(CC) $(CFLAGS) -lpthread -o /dev/null pthreadtest.c >/dev/null 2>&1 && echo "y"; rm pthreadtest.c)
-ifeq ($(PTHREAD_AVAILABLE),y)
-LDLIBS += pthread
-endif
+# libpam may use libpthread, libdl and/or libaudit.
+# On some platforms that requires an explicit -lpthread, -ldl, -laudit.
+# However, on *other platforms* it fails when some of those flags
+# given needlessly. On some systems, crypt needs pthread.
+#
+# I even had a system where a runtime test for pthread
+# (similar to CRYPT_AVAILABLE test above) was not reliable.
+#
+# Do not propagate this mess by adding libraries to CONFIG_PAM/CRYPT_AVAILABLE blocks.
+# Add libraries you need to CONFIG_EXTRA_LDLIBS instead.
ifeq ($(CONFIG_PAM),y)
-# libpam uses libpthread, libdl and libaudit, so for static builds busybox
-# must be linked to libpthread, libdl and libaudit. On some platforms that
-# requires an explicit -lpthread, -ldl and -laudit, so it should be in
-# LDLIBS. For non-static builds, scripts/trylink will take care of removing
-# these flags if possible. (Not bothering to check CONFIG_STATIC because
-# even in a non-static build it could be that the only libpam available is
-# libpam.a, so -lpthread & Co. could still be needed.)
-LDLIBS += pam pam_misc pthread dl audit
+LDLIBS += pam pam_misc
endif
ifeq ($(CONFIG_SELINUX),y)
LDLIBS += $(if $(SELINUX_LIBS),$(SELINUX_LIBS:-l%=%),$(SELINUX_PC_MODULES:lib%=%))
endif
+ifeq ($(CONFIG_FEATURE_NSLOOKUP_BIG),y)
+LDLIBS += resolv
+endif
+
ifeq ($(CONFIG_EFENCE),y)
LDLIBS += efence
endif