将 OpenBR 编译为 ArmV7 - Android 工具链问题

Question

我已经成功通过install/build instructions for OpenBR on linux

我的目标是在 android 上构建和运行 OpenBR。

经过大量的修修补补，我终于成功地为 armv7 构建了 OpenBR。我的问题是，当我执行 "System.loadLibrary("openbr")" 时出现错误：

11-25 23:40:31.221: E/dalvikvm(29742): dlopen("/data/app-lib/com.test.app-28/libopenbr.so") failed: dlopen failed: could not load library "/home/ubuntu/qt5.1.1/android_armv7/lib/libQt5Concurrent.so.5.1.1" needed by "libopenbr.so"; caused by library "/home/ubuntu/qt5.1.1/android_armv7/lib/libQt5Concurrent.so.5.1.1" not found

我相信我已正确包含 armv7 libQt5Concurrent 库（在 android.mk 中作为本地模块加载），但我认为问题在于 libopenbr 在加载时正在查找错误的目录（如错误消息中所示） .它试图在编译机器上查找路径。

在 libopenbr.so 上运行 readelf 会产生以下结果：

 0x00000001 (NEEDED)                     Shared library: [/home/ubuntu/qt5.1.1/android_armv7/lib/libQt5Concurrent.so.5.1.1]
 0x00000001 (NEEDED)                     Shared library: [/home/ubuntu/qt5.1.1/android_armv7/lib/libQt5Core.so.5.1.1]
 0x00000001 (NEEDED)                     Shared library: [/home/ubuntu/qt5.1.1/android_armv7/lib/libQt5Gui.so.5.1.1]
 0x00000001 (NEEDED)                     Shared library: [/home/ubuntu/qt5.1.1/android_armv7/lib/libQt5Network.so.5.1.1]
 0x00000001 (NEEDED)                     Shared library: [/home/ubuntu/qt5.1.1/android_armv7/lib/libQt5Sql.so.5.1.1]
 0x00000001 (NEEDED)                     Shared library: [/home/ubuntu/qt5.1.1/android_armv7/lib/libQt5Widgets.so.5.1.1]
 0x00000001 (NEEDED)                     Shared library: [/home/ubuntu/qt5.1.1/android_armv7/lib/libQt5Xml.so.5.1.1]
 0x00000001 (NEEDED)                     Shared library: [libz.so]
 0x00000001 (NEEDED)                     Shared library: [libdl.so]
 0x00000001 (NEEDED)                     Shared library: [libm.so]
 0x00000001 (NEEDED)                     Shared library: [liblog.so]
 0x00000001 (NEEDED)                     Shared library: [libc.so]

如何获取它，以便在编译时不使用此路径搜索 Qt 库？

我尝试了各种 cmake 指令，包括 openbr CMakeLists.txt 中这些变量的各种排列：

SET(CMAKE_SKIP_RPATH TRUE)

# use, i.e. don't skip the full RPATH for the build tree
SET(CMAKE_SKIP_BUILD_RPATH  TRUE)

# when building, don't use the install RPATH already
# (but later on when installing)
SET(CMAKE_BUILD_WITH_INSTALL_RPATH FALSE)

# the RPATH to be used when installing
SET(CMAKE_INSTALL_RPATH "")

# don't add the automatically determined parts of the RPATH
# which point to directories outside the build tree to the install RPATH
SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH FALSE)

任何从我构建的库的共享库路径中获取此路径的帮助都会很棒！谢谢！

Answer 1

实际上我终于想出了如何通过更新每个 qt lib 的 cmake 文件来解决这个问题，使其不在文件名末尾包含版本字符串！

Answer 2

使用 System.loadLibrary() 加载动态库时，您需要先打开所有依赖项，因为 System.loadLibrary() 不会为您加载它们。

所以可能你必须这样做： System.loadLibrary("libQt5Concurrent") System.loadLibrary("openbr")

如果 libQt5Concurrent 有其他依赖项，你必须以同样的方式加载它们。