how to compiler sve in Android system

[xxxxxxLD]

In linux system,I try to use Android.mk in Android compiler system to compile an executable file including SVE intrinsics, which is supported in armv8.2, and the system config as follows:

• TARGET_ARCH=arm64;
• TARGET_ARCH_VARIANT=armv8-2a;
• TARGET_CPU_VARIANT=cortex-a76
• TARGET_2ND_ARCH=arm;
• TARGET_2ND_ARCH_VARIANT=armv8-2a
• TARGET_2ND_CPU_VARIANT=cortex-a55
• HOST_ARCH=x86_64
• HOST_2ND_ARCH=x86
• HOST_OS=linux

And here are the steps I build:
source build/envsetup.sh
lunch, I choose a platform described as above;
mm, build the modules in the SVE instrinsics directory,and the Android.mk is in the same deirctory;

And the Android.mk is

LOCAL_PATH:= $(call my-dir)
ROOT_DIR := $(LOCAL_PATH)/..
include $(CLEAR_VARS)
LOCAL_MODULE:= SVE_test
LOCAL_SRC_FILES := $(ROOT_DIR)/Project1/main.cpp
LOCAL_CFLAGS := -O3 -ffast-math -DNDK -D_GNU_SOURCE -D__ARM_FEATURE_SVE -D__LITTLE_ENDIAN
LOCAL_CFLAGS += -mfloat-abi=softfp -mfpu=neon -msve-vector-bits=256
LOCAL_LDLIBS  += -lc -ldl -lm -lz -llog -fPIE
APP_CPPFLAGS  +=-std=c++11

ifeq($(TARGET_ARCH_ABI), arm64-v8a)
LOCAL_ARM_NEON:=true
endif
LOCAL_PROPRIETARY_MODULE := TRUE
include $(BUILD_EXECUTABLE)

But some errors I met, it shows thaterror in backend:don't know how to legalize this scalable vector size.
How to solve this problem?

[ggfan]

you might direct the question to https://github.com/android/ndk/issues?

[DanAlbert]

The NDK at the time did not support SVE. r27 should (idr about r26).

#1011 for adding a sample.