x86: Enable -fstack-protector

Change-Id: Iff9e3a3ba0e2d0faa7c6d98154aa5be0cc8a6c50
Orig-Change-Id: Ib69514c3afcb4c1f5e5f3f8cd91acfd145a0866c
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
diff --git a/libc/Android.mk b/libc/Android.mk
index 1425673..cea874f 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -540,18 +540,24 @@
 # that will call __cxa_finalize(&__dso_handle) in order to ensure that
 # static C++ destructors are properly called on dlclose().
 #
+
+libc_crt_target_so_cflags := $(libc_crt_target_cflags)
+ifeq ($(TARGET_ARCH),x86)
+    # This flag must be added for x86 targets, but not for ARM
+    libc_crt_target_so_cflags += -fPIC
+endif
 GEN := $(TARGET_OUT_STATIC_LIBRARIES)/crtbegin_so.o
 $(GEN): $(LOCAL_PATH)/arch-$(TARGET_ARCH)/bionic/crtbegin_so.S
 	@mkdir -p $(dir $@)
-	$(TARGET_CC) $(libc_crt_target_cflags) -o $@ -c $<
+	$(TARGET_CC) $(libc_crt_target_so_cflags) -o $@ -c $<
 ALL_GENERATED_SOURCES += $(GEN)
 
 GEN := $(TARGET_OUT_STATIC_LIBRARIES)/crtend_so.o
 $(GEN): $(LOCAL_PATH)/arch-$(TARGET_ARCH)/bionic/crtend_so.S
 	@mkdir -p $(dir $@)
-	$(TARGET_CC) $(libc_crt_target_cflags) -o $@ -c $<
+	$(TARGET_CC) $(libc_crt_target_so_cflags) -o $@ -c $<
 ALL_GENERATED_SOURCES += $(GEN)
-endif # TARGET_ARCH == x86
+endif # TARGET_ARCH == x86 || TARGET_ARCH == arm
 
 
 GEN := $(TARGET_OUT_STATIC_LIBRARIES)/crtbegin_static.o