NDK - 从 NDK 中删除 GNUSTL 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

今天我将我的 Android Studio NDK 更新到最新版本 18.0.5002713.在成功安装过程后，我尝试重新运行我的应用程序，但无法这样做.不断出现的错误如下:org.gradle.api.ProjectConfigurationException:配置项目':app'时出现问题.

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，我在 NDK 更新后运行我的应用程序时遇到了问题，但能够通过将 arguments '-DANDROID_STL=gnustl_static' 添加到 externalNativeBuild 来解决这些问题app.gradle 文件中的配置.

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 - 对 'cv::CascadeClassifier::detectMultiScale 的未定义引用() NDK 更新后)

通过添加这行代码，我设法在所有 NDK r17c 版本的其余部分中避免了 NDK 的任何类型的问题.

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 版本中，对 GNUSTL 的支持与 gabi++ 和 stlport 一起被删除了.

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

查看 NDK 修订历史:https://developer.android.com/ndk/downloads/修订历史

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

删除现在已弃用的代码行会产生最初是上述问题的原因的错误.现在的问题是 arguments '-DANDROID_STL=gnustl_static' 的最新等价物是什么?

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' 导致旧错误

提前致谢.

推荐答案

正如@Michael 已经建议您可以使用 libc++ 重建 OpenCV.

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

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:用opencv-3.4.1"+ ndk18 测试

NOTE: tested with "opencv-3.4.1" + ndk18

由@shizhen编辑

已在 macOS 上验证，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.

CMake Error: The source directory "/opencv-3.4.1/build"does not appear to contain 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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