NDK-从NDK中删除GNUSTL之后的问题(修订版r18) [英] NDK - problems after GNUSTL has been removed from the NDK (revision r18)

问题描述

今天，我将Android Studio NDK更新为最新版本18.0.5002713.在成功完成安装过程之后，我尝试重新运行我的应用程序，但无法执行此操作.不断出现的错误如下:org.gradle.api.ProjectConfigurationException: A problem occurred configuring project ':app'.

Today I updated my Android Studio NDK to the most recent release 18.0.5002713. After the successful installation process I tried to rerun my app but was not able to do so. The error that keeps appearing is the following: org.gradle.api.ProjectConfigurationException: A problem occurred configuring project ':app'.

过去，NDK更新后我在运行应用程序时遇到了问题，但是能够通过在app.gradle文件中的externalNativeBuild配置中添加arguments '-DANDROID_STL=gnustl_static'来解决这些问题.

In the past I've already had problems running my app after NDK updates but was able to resolve them by adding arguments '-DANDROID_STL=gnustl_static' to the externalNativeBuild configuration in the app.gradle file.

原始问题:( OpenCV-未定义对'cv :: CascadeClassifier :: detectMultiScale的引用()在NDK更新之后)

通过添加这一行代码，我设法在所有NDK r17c其余版本中避免了NDK的任何问题.

By adding this line of code I managed to avoid any sort of problem with the NDK throughout the rest of all NDK r17c releases.

不幸的是，在r18修订版中，与gabi ++和stlport一起删除了对GNUSTL的支持.

Unfortunately with revision r18 the support for GNUSTL has been removed alongside gabi++ and stlport.

请参阅NDK修订历史记录: https://developer.android.com/ndk/downloads/version_history

See NDK revision history: https://developer.android.com/ndk/downloads/revision_history

删除现在不建议使用的代码行会产生错误，该错误最初是上述问题的原因.现在的问题是arguments '-DANDROID_STL=gnustl_static'的最新等效内容是什么?

Removing the now deprecated line of code produces the error that originally was the reason for the aforementioned question. The question now is what is the up-to-date equivalent of arguments '-DANDROID_STL=gnustl_static'?

使用'-DANDROID_STL=c++_static'会导致旧错误

谢谢.

推荐答案

正如@Michael所建议的那样，您可以使用libc ++重建OpenCV.

As @Michael already suggested you can rebuild the OpenCV with libc++.

要这样做:

cd $OPENCV_SRC
mkdir build
cd build
cmake -DCMAKE_TOOLCHAIN_FILE=$ANDROID_DIR/ndk-bundle/build/cmake/android.toolchain.cmake -DANDROID_ABI="arm64-v8a" -DANDROID_STL=c++_static  -DCMAKE_BUILD_TYPE=Release -DANDROID_NATIVE_API_LEVEL=android-24 ..
make install
cd install #the sdk will be here...

注意: 使用"opencv-3.4.1" + ndk18进行了测试

NOTE: tested with "opencv-3.4.1" + ndk18

由@shizhen编辑

在macOS上进行了验证，应在cmake命令后添加..以使以下错误消失.

Verified on macOS, should add .. after cmake command to make below error disappear.

CMake错误:源目录"/opencv-3.4.1/build"似乎不包含CMakeLists.txt.

更新如下:

cd $OPENCV_SRC
mkdir build
cd build
cmake .. -DCMAKE_TOOLCHAIN_FILE=$ANDROID_DIR/ndk-bundle/build/cmake/android.toolchain.cmake -DANDROID_ABI="arm64-v8a" -DANDROID_STL=c++_static  -DCMAKE_BUILD_TYPE=Release -DANDROID_NATIVE_API_LEVEL=android-24 
make install
cd install #the sdk will be here...

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