为Android arm64-v8a构建OpenCV时出错

Question

我正在尝试为安卓系统构建OpenCV 3.2。当我试图为armeabi-v7a配置构建它时，我没有遇到编译它的问题。但是，当我试图为arm64-v8a硬件编译它时，我得到了以下消息：

/Library/Android/sdk/ndk-bundle/platforms/android-21/arch-arm/usr/include/signal.h:87:12: error: expected ')'
    void (*sa_sigaction)(int, struct siginfo*, void*);
           ^
/Library/Android/sdk/ndk-bundle/platforms/android-21/arch-arm/usr/include/asm/signal.h:102:24: note: expanded from macro 'sa_sigaction'
#define sa_sigaction _u._sa_sigaction
                       ^
/Library/Android/sdk/ndk-bundle/platforms/android-21/arch-arm/usr/include/signal.h:87:10: note: to match this '('
    void (*sa_sigaction)(int, struct siginfo*, void*);
         ^
/Library/Android/sdk/ndk-bundle/platforms/android-21/arch-arm/usr/include/signal.h:87:12: error: duplicate member '_u'
    void (*sa_sigaction)(int, struct siginfo*, void*);
           ^
/Library/Android/sdk/ndk-bundle/platforms/android-21/arch-arm/usr/include/asm/signal.h:102:22: note: expanded from macro 'sa_sigaction'
#define sa_sigaction _u._sa_sigaction
                     ^
/Library/Android/sdk/ndk-bundle/platforms/android-21/arch-arm/usr/include/signal.h:86:18: note: previous declaration is here
    sighandler_t sa_handler;
                 ^
/Library/Android/sdk/ndk-bundle/platforms/android-21/arch-arm/usr/include/asm/signal.h:101:20: note: expanded from macro 'sa_handler'
#define sa_handler _u._sa_handler  

以下是cmake的配置方式：

cmake -DCMAKE_TOOLCHAIN_FILE=$ANDROID_TOOLCHAIN -DANDROID_NDK=$NDK_ROOT  -DANDROID_ABI=arm64-v8a  -DANDROID_NATIVE_API_LEVEL=21  -DCMAKE_INSTALL_PREFIX=~/opencv/arm64 -DBUILD_TESTS=OFF -DBUILD_PERF_TESTS=OFF -DBUILD_TIFF=false -DTIFF_LIBRARY=$TIFF_LIBRARY -DTIFF_INCLUDE_DIR=$TIFF_INCLUDE_DIR -DBUILD_OPENEXR=false  

还有其他人遇到过这个问题吗？我已经和它斗争了两天了。任何帮助都将不胜感激。

编辑：我注意到cmake输出了这一行：

Target:                      Android 21 armv7-a

尽管我将abi设置为arm64-v8a。知道为什么吗？

Answer 1

希望你已经解决了这个问题。当我首先使用cmake，然后分配一个工具链文件时，我也遇到了这个问题。我解决了这个问题，就用

cmake .. -DCMAKE_TOOLCHAIN_FILE=$NDK_PATH/build/cmake/android.toolchain.cmake -DANDROID_ABI="arm64-v8a"

然后使用cmake对构建子系统进行设置.那一切都会好起来的。