opencv需要gunstl
opencv 3.4.3版本，在android studio中编译，
build.gradle
externalNativeBuild {
cmake {
cppFlags "-std=c++11 -frtti -fexceptions"
abiFilters "arm64-v8a"
arguments '-DANDROID_STL=gnustl_shared'
//arguments "-DANDROID_ALLOW_UNDEFINED_SYMBOLS=TRUE"
}
}
cmake {
cppFlags "-std=c++11 -frtti -fexceptions"
abiFilters "arm64-v8a"
arguments '-DANDROID_STL=gnustl_shared'
//arguments "-DANDROID_ALLOW_UNDEFINED_SYMBOLS=TRUE"
}
}
发现找不到libgunstl_shared.so
Expected NDK STL shared object file at <NDK>/soureces/cxx-stl/gnu-libstdc++/4.9/libs/arm64-v8a/libgunstl_shared.so
打开ndk（版本为r18）目录下的CHANGELOG.md，有如下内容
CHANGELOG.md
* gnustl, gabi++, and stlport have been removed.
下载NDK r16，设置为当前工程的NDK
File --> Project Structure --> SDK Location --> Android NDK Location
编译通过
坑在于：文档并没有说明OpenCV编译需要gnustl，有人是把OpenCV的库用libc++重新编译了，这个工作对于一般的库用户来说太难了。
参考：https://stackoverflow.com/questions/52410712/ndk-problems-after-gnustl-has-been-removed-from-the-ndk-revision-r18
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