在 Linux 主机上为 Android 目标交叉编译 OpenCV：Cmake 配置期间的错误

【问题标题】：Cross-compile OpenCV on Linux Host for Android Target: Errors during Cmake configuration在 Linux 主机上为 Android 目标交叉编译 OpenCV：Cmake 配置期间的错误
【发布时间】：2022-07-28 19:39:34
【问题描述】：

问题描述：

我正在尝试在支持 OpenCL 的 Ubuntu 20.04 LTS for Android (aarch64) 上编译 OpenCV 4.5.1（因为库存的 OpenCV Android SDK 没有激活 OpenCL 支持）。我主要关注this tutorial covering the cross-compilation of OpenCV。

在尝试配置构建时，Cmake 似乎无法正确创建/定位所有必要的文件夹，从而引发错误（请参阅下面的 cmake 输出）。

我怀疑这可能与 Cmake 难以正确识别 ant 安装有关（如 Cmake 输出中 ant 路径后面缺少的版本号所示）。

我已经通过 Cmake 构建标志为 ANT 可执行文件和 Java 主文件夹设置了环境变量（请参阅下面的 Cmake 命令）。

查看 Cmake 输出底部的错误消息时，很明显在创建必要的 Android 和/或 Java 文件夹时存在一些问题。在检查modules/java/android_sdk/CMakeLists.txt（见下面的摘录）后，我注意到变量OPENCV_JAVA_DIR 可能应该在cmake 配置的某个早期阶段设置。但是，当运行我粘贴在下面的命令时，此变量保持为空，因此 cmake 无法访问文件夹，因为路径不正确。

这些是运行我的 cmake 配置命令时的变量值：

-- OPENCV_JAVA_DIR = /opencv
-- ANDROID_EXECUTABLE = FALSE
-- ANDROID_BUILD_BASE_DIR = 
-- OpenCV_BINARY_DIR= /home/flavio/Downloads/opencv/build_manual

我的 Cmake 构建标志中是否有一些配置错误或完全不同的东西我做错了？

感谢您的帮助！

相关问题

Cmake cannot find ant

Cmake cannot recognise Java

Ant for Java not showing as installed eventhough it is

我已经尝试了所有建议的更改，但到目前为止没有成功。重新安装 ant 并没有帮助，也没有在/usr/bin 中的/usr/share/ant/bin/ant 创建指向可执行存储的符号链接。

使用的 Cmake 命令（在下载的 opencv-source 内的 build 文件夹中）：

cmake \
-DCMAKE_TOOLCHAIN_FILE=~/Android/Sdk/ndk/21.0.6113669/build/cmake/android.toolchain.cmake \
-DANDROID_TOOLCHAIN=clang++ \
-DANDROID_ABI=arm64-v8a \
-DANDROID_TARGET_SDK_VERSION=26 \
-DANDROID_MIN_SDK_VERSION=24 \
-DBUILD_JAVA=ON -DBUILD_FAT_JAVA_LIB=ON DBUILD_ZLIB=ON \
-D CMAKE_BUILD_TYPE=Release \
-D ANDROID_NATIVE_API_LEVEL=24 \
-DANDROID_COMPILE_SDK_VERSION=26 \
-D ANDROID_STL=c++_shared \
-D WITH_CUDA=OFF \
-D WITH_MATLAB=OFF \
-D BUILD_ANDROID_EXAMPLES=OFF -D BUILD_DOCS=OFF -D BUILD_PERF_TESTS=OFF -D BUILD_TESTS=ON -D BUILD_SHARED_LIBS=OFF -DBUILD_ANDROID_PROJECTS=OFF -DBUILD_JNI=ON \
-DWITH_OPENCL=ON -DWITH_OPENGL=ON \
-DANT_HOME=/usr/share/ant -DJAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64 -DANT_EXECUTABLE=/bin/ant \
-DSTRIP=/home/flavio/Android/Sdk/ndk/21.0.6113669/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-strip \
..

从modules/java/android_sdk/CMakeList.txt中提取：

project(${the_module}_android)

if(ANDROID_EXECUTABLE)
  set(OPENCV_JAVA_DIR "${OpenCV_BINARY_DIR}/android_sdk" CACHE INTERNAL "")
else()  # gradle
  set(OPENCV_JAVA_DIR "${ANDROID_BUILD_BASE_DIR}/opencv" CACHE INTERNAL "")
endif()
set(OPENCV_ANDROID_LIB_DIR "${OPENCV_JAVA_DIR}" CACHE INTERNAL "")  # for OpenCV samples

message (STATUS "OPENCV_JAVA_DIR = ${OPENCV_JAVA_DIR}")
message (STATUS "ANDROID_BUILD_BASE_DIR = ${ANDROID_BUILD_BASE_DIR}")
message (STATUS "OpenCV_BINARY_DIR= ${OpenCV_BINARY_DIR}")
file(REMOVE_RECURSE "${OPENCV_JAVA_DIR}")
file(MAKE_DIRECTORY "${OPENCV_JAVA_DIR}/bin")
set(java_src_dir "${OPENCV_JAVA_DIR}/src")
file(MAKE_DIRECTORY "${java_src_dir}")

Cmake 终端输出

-- Check for working CXX compiler: /home/flavio/Android/Sdk/ndk/21.0.6113669/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++
-- Check for working CXX compiler: /home/flavio/Android/Sdk/ndk/21.0.6113669/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Check for working C compiler: /home/flavio/Android/Sdk/ndk/21.0.6113669/toolchains/llvm/prebuilt/linux-x86_64/bin/clang
-- Check for working C compiler: /home/flavio/Android/Sdk/ndk/21.0.6113669/toolchains/llvm/prebuilt/linux-x86_64/bin/clang -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Detected processor: aarch64
CMake Warning at cmake/OpenCVUtils.cmake:752 (message):
  Unexpected option: WITH_OPENGL (=ON)

  Condition: IF (NOT;ANDROID;AND;NOT;WINRT)
Call Stack (most recent call first):
  CMakeLists.txt:308 (OCV_OPTION)


-- Found PythonInterp: /usr/bin/python2.7 (found suitable version "2.7.18", minimum required is "2.7") 
-- Found PythonInterp: /usr/bin/python3 (found suitable version "3.8.10", minimum required is "3.2") 
-- Looking for ccache - not found
<---------- Performed Tests have been cut out from this output to meet character-limit of stackoverflow questions ----------->
-- ANDROID: TRUE
-- Update variable ANDROID_SDK_ROOT from environment: /home/flavio/Android/Sdk
-- Update variable ANDROID_HOME from environment: /home/flavio/Android/Sdk
Android: Projects builds are DISABLED
-- Looking for dlerror in dl
-- Looking for dlerror in dl - found
-- ADE: Download: v0.1.1f.zip
-- Allocator metrics storage type: 'int'
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.sse2.cpp
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.sse3.cpp
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.ssse3.cpp
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.sse4_1.cpp
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.sse4_2.cpp
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.avx.cpp
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.avx2.cpp
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.avx512_skx.cpp
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin256.avx2.cpp
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin256.avx512_skx.cpp
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin512.avx512_skx.cpp
-- Excluding from source files list: modules/imgproc/src/corner.avx.cpp
-- Excluding from source files list: modules/imgproc/src/imgwarp.avx2.cpp
-- Excluding from source files list: modules/imgproc/src/imgwarp.sse4_1.cpp
-- Excluding from source files list: modules/imgproc/src/resize.avx2.cpp
-- Excluding from source files list: modules/imgproc/src/resize.sse4_1.cpp
-- Registering hook 'INIT_MODULE_SOURCES_opencv_dnn': /home/flavio/Downloads/opencv/modules/dnn/cmake/hooks/INIT_MODULE_SOURCES_opencv_dnn.cmake
-- opencv_dnn: filter out cuda4dnn source code
-- Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.avx.cpp
-- Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.avx2.cpp
-- Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.avx512_skx.cpp
-- Excluding from source files list: modules/features2d/src/fast.avx2.cpp
-- OPENCV_JAVA_DIR = /opencv
-- ANDROID_BUILD_BASE_DIR = 
-- OpenCV_BINARY_DIR= /home/flavio/Downloads/opencv/build_manual
CMake Error at modules/java/android_sdk/CMakeLists.txt:15 (file):
  file problem creating directory: /opencv/bin


CMake Error at modules/java/android_sdk/CMakeLists.txt:17 (file):
  file problem creating directory: /opencv/src


CMake Error: Could not open file for write in copy operation /opencv/AndroidManifest.xml.tmp
CMake Error: : System Error: No such file or directory
CMake Error at modules/java/android_sdk/CMakeLists.txt:121 (configure_file):
  configure_file Problem configuring file


CMake Error: Could not open file for write in copy operation /opencv/build.gradle.tmp
CMake Error: : System Error: No such file or directory
CMake Error at modules/java/android_sdk/CMakeLists.txt:121 (configure_file):
  configure_file Problem configuring file


CMake Error: Could not open file for write in copy operation /opencv/res/values/attrs.xml.tmp
CMake Error: : System Error: No such file or directory
CMake Error at modules/java/android_sdk/CMakeLists.txt:121 (configure_file):
  configure_file Problem configuring file


CMake Error: Could not open file for write in copy operation /opencv/libcxx_helper/CMakeLists.txt.tmp
CMake Error: : System Error: No such file or directory
CMake Error at modules/java/android_sdk/CMakeLists.txt:133 (configure_file):
  configure_file Problem configuring file


CMake Error: Could not open file for write in copy operation /opencv/libcxx_helper/dummy.cpp.tmp
CMake Error: : System Error: No such file or directory
CMake Error at modules/java/android_sdk/CMakeLists.txt:133 (configure_file):
  configure_file Problem configuring file


CMake Error: Could not open file for write in copy operation /opencv/build.gradle.tmp
CMake Error: : System Error: No such file or directory
CMake Error at modules/java/android_sdk/CMakeLists.txt:160 (configure_file):
  configure_file Problem configuring file


-- Android OpenCV Manager is ignored
-- 
-- General configuration for OpenCV 4.5.1 =====================================
--   Version control:               unknown
-- 
--   Platform:
--     Timestamp:                   2022-03-20T09:57:50Z
--     Host:                        Linux 5.13.0-35-generic x86_64
--     Target:                      Android 1 aarch64
--     CMake:                       3.16.3
--     CMake generator:             Unix Makefiles
--     CMake build tool:            /usr/bin/make
--     Configuration:               Release
-- 
--   CPU/HW features:
--     Baseline:                    NEON FP16
-- 
--   C/C++:
--     Built as dynamic libs?:      NO
--     C++ standard:                11
--     C++ Compiler:                /home/flavio/Android/Sdk/ndk/21.0.6113669/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++  (ver 9.0)
--     C++ flags (Release):         -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security     -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winconsistent-missing-override -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Qunused-arguments    -fvisibility=hidden -fvisibility-inlines-hidden -O2 -DNDEBUG   -DNDEBUG
--     C++ flags (Debug):           -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security     -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winconsistent-missing-override -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Qunused-arguments    -fvisibility=hidden -fvisibility-inlines-hidden -O0   -DDEBUG -D_DEBUG
--     C Compiler:                  /home/flavio/Android/Sdk/ndk/21.0.6113669/toolchains/llvm/prebuilt/linux-x86_64/bin/clang
--     C flags (Release):           -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security    -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winconsistent-missing-override -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Qunused-arguments    -fvisibility=hidden -fvisibility-inlines-hidden -O2 -DNDEBUG   -DNDEBUG
--     C flags (Debug):             -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security    -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winconsistent-missing-override -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Qunused-arguments    -fvisibility=hidden -fvisibility-inlines-hidden -O0   -DDEBUG -D_DEBUG
--     Linker flags (Release):      -Wl,--exclude-libs,libgcc_real.a -Wl,--exclude-libs,libatomic.a -Wl,--build-id -Wl,--fatal-warnings -Wl,--no-undefined -Qunused-arguments   -Wl,--as-needed  
--     Linker flags (Debug):        -Wl,--exclude-libs,libgcc_real.a -Wl,--exclude-libs,libatomic.a -Wl,--build-id -Wl,--fatal-warnings -Wl,--no-undefined -Qunused-arguments   -Wl,--as-needed  
--     ccache:                      NO
--     Precompiled headers:         NO
--     Extra dependencies:          ade dl m log
--     3rdparty dependencies:       libcpufeatures ittnotify libprotobuf zlib libjpeg-turbo libwebp libpng libtiff libopenjp2 IlmImf quirc tegra_hal
-- 
--   OpenCV modules:
--     To be built:                 calib3d core dnn features2d flann gapi highgui imgcodecs imgproc java ml objdetect photo stitching ts video videoio
--     Disabled:                    world
--     Disabled by dependency:      -
--     Unavailable:                 python2 python3
--     Applications:                tests
--     Documentation:               NO
--     Non-free algorithms:         NO
-- 
--   Android NDK:                   /home/flavio/Android/Sdk/ndk/21.0.6113669 (ver 21.0.6113669)
--     Android ABI:                 arm64-v8a
--     NDK toolchain:               aarch64-linux-android-4.9
--     STL type:                    c++_shared
--     Native API level:            24
--   Android SDK:                   not used, projects are not built
-- 
--   GUI: 
--     OpenGL support:              NO
-- 
--   Media I/O: 
--     ZLib:                        build (ver 1.2.11)
--     JPEG:                        build-libjpeg-turbo (ver 2.0.6-62)
--     WEBP:                        build (ver encoder: 0x020f)
--     PNG:                         build (ver 1.6.37)
--     TIFF:                        build (ver 42 - 4.0.10)
--     JPEG 2000:                   build (ver 2.3.1)
--     OpenEXR:                     build (ver 2.3.0)
--     HDR:                         YES
--     SUNRASTER:                   YES
--     PXM:                         YES
--     PFM:                         YES
-- 
--   Video I/O:
-- 
--   Parallel framework:            pthreads
-- 
--   Trace:                         YES (with Intel ITT)
-- 
--   Other third-party libraries:
--     Custom HAL:                  YES (carotene (ver 0.0.1))
--     Protobuf:                    build (3.5.1)
-- 
--   OpenCL:                        YES (no extra features)
--     Include path:                /home/flavio/Downloads/opencv/3rdparty/include/opencl/1.2
--     Link libraries:              Dynamic load
-- 
--   Python (for build):            /usr/bin/python2.7
-- 
--   Java:                          export all functions
--     ant:                         /bin/ant (ver )
--     Java wrappers:               YES
--     Java tests:                  NO
-- 
--   Install to:                    /home/flavio/Downloads/opencv/build_manual/install
-- -----------------------------------------------------------------
-- 
-- Configuring incomplete, errors occurred!
See also "/home/flavio/Downloads/opencv/build_manual/CMakeFiles/CMakeOutput.log".
See also "/home/flavio/Downloads/opencv/build_manual/CMakeFiles/CMakeError.log".

【问题讨论】：

    标签： android opencv cmake cross-compiling


    【解决方案1】：

    我有类似的错误，所以我通过打开-DBUILD_ANDROID_PROJECTS=ON 修复它并修复所有不兼容的“SDK TOOL 版本”或“gradle 版本”。然后gradle可以在modules/java/android_sdk/CMakeLists.txt:15中设置所有必要的路径，比如ANDROID_BUILD_BASE_DIR。

    例如更新SDK工具：打开android studio > setting > system settings > Android SDK > SDK Tools > update Android SDK build tools and NDK(side by side)

    【讨论】：

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