如何解决以非零退出值2 /退出值-1完成的“ Android / Sdk / ndk-bundle / ndk-build.cmd”

Question

我正在使用 ndk（18.1）的最新版本。每当我尝试编译代码时，它就会显示任务'：app：ndkBuild'的执行失败

我尝试了ndk的2个不同版本（18.1）和（14.1），两者都显示几乎相同的错误，而唯一的区别是

• ndk（18.1）显示退出值2
• ndk（14.1）显示退出值-1

jni路径：

Build.Gradle：

apply plugin: 'com.android.application'

android {
compileSdkVersion 28
defaultConfig {
    applicationId "com.fyp.major.fyp1"
    minSdkVersion 21
    targetSdkVersion 28
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}

sourceSets.main {
    jni.srcDirs = []  //disable automatic ndk-build call
}

task ndkBuild(type: Exec, description: 'Compile JNI source via NDK') {
    commandLine "C:/Users/MaJoR/AppData/Local/Android/Sdk/ndk-bundle/ndk-build.cmd",
            'NDK_PROJECT_PATH=build/intermediates/ndk',
            'NDK_LIBS_OUT=src/main/jniLibs',
            'APP_BUILD_SCRIPT=src/main/jni/Android.mk',
            'NDK_APPLICATION_MK=src/main/jni/Application.mk'
}
tasks.withType(JavaCompile) {
    compileTask -> compileTask.dependsOn ndkBuild
}

buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
  }
}

dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:28.0.0-alpha1'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation project(':openCVLibrary344')
}

ANDROID.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

#opencv
OPENCVROOT:= C:\OpenCV-3.4.0-android-sdk
OPENCV_CAMERA_MODULES:=on
OPENCV_INSTALL_MODULES:=on
OPENCV_LIB_TYPE:=SHARED
include ${OPENCVROOT}/sdk/native/jni/OpenCV.mk

LOCAL_SRC_FILES := com_fyp_major_fyp1_OpencvClass.cpp

LOCAL_LDLIBS += -llog
LOCAL_MODULE := MyLibs

include $(BUILD_SHARED_LIBRARY)

APPLICATION.mk

APP_STL := gnustl_static
APP_CPPFLAGS := -frtti -fexceptions
APP_ABI := armeabi-v7a
APP_PLATFORM := android-16

使用ndk 18.1时出现输出错误

使用ndk 14.1时出现输出错误

这些错误的解决方案吗？

Answer 1

NDK r18已下线 gnustl ，因此您必须rebuild OpenCV for libc++。

对于NDK r14.1，没有太多信息可以解释失败。请注意，屏幕截图中提到的是 ndk-stack.cmd 而不是 ndk-build.cmd 在此处运行。切换到较旧的NDK时可能会打错吗？