Develop Reference

Android NDK ImageDecoder functions requires build error

I'm trying to get byte data of png file for GLES texture.
I have my png file in app\source\main\assets.
Texture::Texture(const char *path) {
AAsset* asset = loadAsset(path);
AImageDecoder* decoder;
int result = AImageDecoder_createFromAAsset(asset, &decoder);
if(result != ANDROID_IMAGE_DECODER_SUCCESS){
__android_log_print(ANDROID_LOG_VERBOSE, "Android2", "Texture constructor create decode FAIL. path: &s", path);
}
const AImageDecoderHeaderInfo* info = AImageDecoder_getHeaderInfo(decoder);
this->width = AImageDecoderHeaderInfo_getWidth(info);
this->height = AImageDecoderHeaderInfo_getHeight(info);
size_t stride = AImageDecoder_getMinimumStride(decoder);
size_t size = height * stride;
void* pixels = malloc(size);
result = AImageDecoder_decodeImage(decoder, pixels, stride, size);
if(result != ANDROID_IMAGE_DECODER_SUCCESS){
__android_log_print(ANDROID_LOG_VERBOSE, "Android2", "Texture constructor decode image FAIL. path: &s", path);
}
//GLES create texture and bind data(pixels)
free(pixels);
AAsset_close(asset);
}
but I got following build errors:
Build command failed.
Error while executing process C:\Users\jaewo\AppData\Local\Android\Sdk\cmake\3.10.2.4988404\bin\ninja.exe with arguments {-C C:\Users\jaewo\AndroidStudioProjects\ANdroid2\app\.cxx\cmake\debug\x86 native-lib}
ninja: Entering directory `C:\Users\jaewo\AndroidStudioProjects\ANdroid2\app\.cxx\cmake\debug\x86'
[1/2] Building CXX object CMakeFiles/native-lib.dir/Texture.cpp.o
C:/Users/jaewo/AndroidStudioProjects/ANdroid2/app/src/main/cpp/Texture.cpp:20:122: warning: data argument not used by format string [-Wformat-extra-args]
__android_log_print(ANDROID_LOG_VERBOSE, "Android2", "Texture constructor create decode FAIL. path: &s", path);
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^
C:/Users/jaewo/AndroidStudioProjects/ANdroid2/app/src/main/cpp/Texture.cpp:32:121: warning: data argument not used by format string [-Wformat-extra-args]
__android_log_print(ANDROID_LOG_VERBOSE, "Android2", "Texture constructor decode image FAIL. path: &s", path);
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^
2 warnings generated.
[2/2] Linking CXX shared library C:\Users\jaewo\AndroidStudioProjects\ANdroid2\app\build\intermediates\cmake\debug\obj\x86\libnative-lib.so
FAILED: C:/Users/jaewo/AndroidStudioProjects/ANdroid2/app/build/intermediates/cmake/debug/obj/x86/libnative-lib.so
cmd.exe /C "cd . && C:\Users\jaewo\AppData\Local\Android\Sdk\ndk\21.4.7075529\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe --target=i686-none-linux-android30 --gcc-toolchain=C:/Users/jaewo/AppData/Local/Android/Sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64 --sysroot=C:/Users/jaewo/AppData/Local/Android/Sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/sysroot -fPIC -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security -std=c++17 -O0 -fno-limit-debug-info -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libgcc_real.a -Wl,--exclude-libs,libatomic.a -static-libstdc++ -Wl,--build-id -Wl,--fatal-warnings -Wl,--no-undefined -Qunused-arguments -shared -Wl,-soname,libnative-lib.so -o C:\Users\jaewo\AndroidStudioProjects\ANdroid2\app\build\intermediates\cmake\debug\obj\x86\libnative-lib.so CMakeFiles/native-lib.dir/native-lib.cpp.o CMakeFiles/native-lib.dir/AssetManager.cpp.o CMakeFiles/native-lib.dir/Texture.cpp.o -llog -landroid -lGLESv3 box2d/libbox2d.a -latomic -lm && cd ."
C:/Users/jaewo/AndroidStudioProjects/ANdroid2/app/src/main/cpp/Texture.cpp:18: error: undefined reference to 'AImageDecoder_createFromAAsset'
C:/Users/jaewo/AndroidStudioProjects/ANdroid2/app/src/main/cpp/Texture.cpp:23: error: undefined reference to 'AImageDecoder_getHeaderInfo'
C:/Users/jaewo/AndroidStudioProjects/ANdroid2/app/src/main/cpp/Texture.cpp:24: error: undefined reference to 'AImageDecoderHeaderInfo_getWidth'
C:/Users/jaewo/AndroidStudioProjects/ANdroid2/app/src/main/cpp/Texture.cpp:25: error: undefined reference to 'AImageDecoderHeaderInfo_getHeight'
C:/Users/jaewo/AndroidStudioProjects/ANdroid2/app/src/main/cpp/Texture.cpp:27: error: undefined reference to 'AImageDecoder_getMinimumStride'
C:/Users/jaewo/AndroidStudioProjects/ANdroid2/app/src/main/cpp/Texture.cpp:30: error: undefined reference to 'AImageDecoder_decodeImage'
C:/Users/jaewo/AndroidStudioProjects/ANdroid2/app/src/main/cpp/Texture.cpp:35: error: undefined reference to 'AImageDecoder_delete'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.
in app build.gradle file, I set minSDKVersion to 30.
I think I should link a library about ImageDecoder or do something in my CMakeLists.txt.
but I'm not sure.
target_link_libraries(
native-lib
log
android
GLESv3
box2d)

You need to link jnigraphics.
For example:
target_link_libraries(
native-lib
log
android
GLESv3
box2d
jnigraphics)
There's an example at the image-decoder sample project.

Android Vulkan linker command failed

I'm trying to use Vulkan on Android so I had installed android ndk. I saw that in Android Studio default native C++, Vulkan is included. But whenever I build I get the following error:
C:/Users/a18/AndroidStudioProjects/vulkanSMD/app/src/main/cpp/native-lib.cpp:34:
error: undefined reference to 'vkCreateInstance' clang++: error:
linker command failed with exit code 1 (use -v to see invocation)
I've tried including libvulkan.so and also tried dlopen("libvulkan.so", flags) but it is of no use.
I'm trying to get Vulkan working on android. The below code creates a vulkan instance.
#include <jni.h>
#include <string>
#include <vector>
#define VK_USE_PLATFORM_ANDROID_KHR 1
#include <vulkan/vulkan.h>
std::vector<const char *>extensions;
std::vector<const char *>layers;
extern "C" JNIEXPORT jstring JNICALL
Java_com_example_vulkansmd_MainActivity_stringFromJNI(
JNIEnv *env,
jobject /* this */) {
extensions = std::vector<const char *>({
"VK_EXT_debug_report",
"VK_KHR_surface",
});
layers = std::vector<const char *>({"VK_LAYER_LUNARG_standard_validation"});
VkInstanceCreateInfo createInfo = {};
VkApplicationInfo appInfo = {};
appInfo.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
appInfo.pApplicationName = "Vulkan is hard";
appInfo.applicationVersion = VK_VERSION_1_0;
appInfo.engineVersion = VK_VERSION_1_0;
appInfo.apiVersion = VK_VERSION_1_0 ;
createInfo.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
createInfo.pApplicationInfo = &appInfo;
createInfo.ppEnabledExtensionNames = extensions.data();
createInfo.enabledExtensionCount = static_cast<uint32_t>(extensions.size());
createInfo.ppEnabledLayerNames = layers.data();
createInfo.enabledLayerCount = static_cast<uint32_t>(layers.size());
VkInstance instance;
vkCreateInstance(&createInfo, nullptr, &instance);
std::string hello = "Hello from C++";
return env->NewStringUTF(hello.c_str());
}
While building however I get the following error
Build command failed. Error while executing process
C:\Users\a18\AppData\Local\Android\Sdk\cmake\3.10.2.4988404\bin\cmake.exe
with arguments {--build
C:\Users\a18\AndroidStudioProjects\vulkanSMD\app.externalNativeBuild\cmake\debug\x86_64
--target native-lib} [1/2] Building CXX object CMakeFiles/native-lib.dir/native-lib.cpp.o [2/2] Linking CXX shared
library
C:\Users\a18\AndroidStudioProjects\vulkanSMD\app\build\intermediates\cmake\debug\obj\x86_64\libnative-lib.so
FAILED:
C:/Users/a18/AndroidStudioProjects/vulkanSMD/app/build/intermediates/cmake/debug/obj/x86_64/libnative-lib.so
cmd.exe /C "cd . &&
C:\Users\a18\AppData\Local\Android\Sdk\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe
--target=x86_64-none-linux-android26 --gcc-toolchain=C:/Users/a18/AppData/Local/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64
--sysroot=C:/Users/a18/AppData/Local/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/sysroot
-fPIC -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -fno-addrsig -Wa,--noexecstack -Wformat -Werror=format-security -O0 -fno-limit-debug-info -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libatomic.a -static-libstdc++ -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Qunused-arguments -Wl,-z,noexecstack -shared -Wl,-soname,libnative-lib.so -o C:\Users\a18\AndroidStudioProjects\vulkanSMD\app\build\intermediates\cmake\debug\obj\x86_64\libnative-lib.so
CMakeFiles/native-lib.dir/native-lib.cpp.o -llog -latomic -lm && cd
."
C:/Users/a18/AndroidStudioProjects/vulkanSMD/app/src/main/cpp/native-lib.cpp:34:
error: undefined reference to 'vkCreateInstance' clang++: error:
linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.

Using std::bad_function_call with LIBCPP_ABI_UNSTABLE

I am trying to build a native library in my Android Studio project that uses the std::bad_function_call function.
Here's the CMakeLists.txt file I use to build my native module:
cmake_minimum_required(VERSION 3.4.1)
include_directories(src/main/cpp)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti -D_LIBCPP_ABI_UNSTABLE")
add_library(
MyLib
SHARED
src/main/cpp/test.cpp
)
and my test.cpp contains the following code:
void SomeClass::SomeMethod() {
std::function<int()> f = nullptr;
try {
f();
} catch (const std::bad_function_call& e) {
}
}
with the corresponding build.gradle section:
externalNativeBuild {
cmake {
arguments "-DANDROID_TOOLCHAIN=clang", "-DANDROID_STL=c++_static", "-DANDROID_NDK_ROOT=${android.ndkDirectory}"
}
}
If I pass the _LIBCPP_ABI_UNSTABLE flag to the compiler I get a link error:
Execution failed for task ':runtime:externalNativeBuildRelease'.
> Build command failed.
Error while executing process C:\android-sdk\cmake\3.6.4111459\bin\cmake.exe with arguments {--build C:\work\android-runtime\test-app\runtime\.externalNativeBuild\cmake\release\armeabi-v7a --target MyLib}
[1/1] Linking CXX shared library ..\..\..\..\build\intermediates\cmake\release\obj\armeabi-v7a\libMyLib.so
FAILED: cmd.exe /C "cd . && C:\android-sdk\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe --target=armv7-none-linux-androideabi17 --gcc-toolchain=C:/android-sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64 -fPIC --sysroot C:/android-sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/sysroot -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -mfpu=vfpv3-d16 -fno-addrsig -mthumb -Wa,--noexecstack -Wformat -Werror=format-security -stdlib=libc++ -fno-rtti -D_LIBCPP_ABI_UNSTABLE -Oz -DNDEBUG -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libatomic.a -static-libstdc++ -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--exclude-libs,libunwind.a -Wl,--no-undefined -Qunused-arguments -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libMyLib.so -o ..\..\..\..\build\intermediates\cmake\release\obj\armeabi-v7a\libMyLib.so CMakeFiles/MyLib.dir/src/main/cpp/test.cpp.o ../../../../src/main/libs/armeabi-v7a/abc.a -llog -latomic -lm && cd ."
C:/android-sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/sysroot/usr/include/c++/v1/functional:0: error: undefined reference to 'vtable for std::__ndk1::bad_function_call'
C:/android-sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: the vtable symbol may be undefined because the class is missing its key function
C:/android-sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/sysroot/usr/include/c++/v1/functional:0: error: undefined reference to 'std::__ndk1::bad_function_call::~bad_function_call()'
clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.
If I remove the _LIBCPP_ABI_UNSTABLE flag:
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")
then the project compiles fine.
So my question is what would be the proper way to enable the libc++ unstable abi and use the bad_function_call method inside my native module?
Note: I am using Android NDK 19.

Integrating FFMPEG using cmake: undefined reference when linking libraries

I've been trying to cross-compile ffmpeg for different Android cpu archs for couple of days now and I have finally succeeded in the task. But now that I need to integrate these pre-built .so files in my project I'm facing errors which have me baffled.
This is the CMakeLists.txt which I'm using:
cmake_minimum_required(VERSION 3.4.1)
# convert SDK path to forward slashes on Windows
file(TO_CMAKE_PATH ${PATH_TO_SUPERPOWERED} PATH_TO_SUPERPOWERED)
set(CMAKE_VERBOSE_MAKEFILE on)
include_directories(src/main/cpp)
include_directories(${PATH_TO_SUPERPOWERED})
include_directories(${PATH_TO_FFMPEG}/${ANDROID_ABI}/include)
add_library(
avutil
SHARED
${PATH_TO_FFMPEG}/${ANDROID_ABI}/lib/libavutil.so
)
set_target_properties(avutil PROPERTIES LINKER_LANGUAGE CXX)
add_library(
avformat
SHARED
${PATH_TO_FFMPEG}/${ANDROID_ABI}/lib/libavformat.so
)
set_target_properties(avformat PROPERTIES LINKER_LANGUAGE CXX)
add_library(
avcodec
SHARED
${PATH_TO_FFMPEG}/${ANDROID_ABI}/lib/libavcodec.so
)
set_target_properties(avcodec PROPERTIES LINKER_LANGUAGE CXX)
add_library(
Canto
SHARED
src/main/cpp/Dubsmash.cpp
src/main/cpp/Karaoke.cpp
src/main/cpp/Singing.cpp
src/main/cpp/EditDubsmash.cpp
${PATH_TO_SUPERPOWERED}/AndroidIO/SuperpoweredAndroidAudioIO.cpp
)
# link the native library against the following libraries
target_link_libraries(
Canto
avutil
avformat
avcodec
${PATH_TO_SUPERPOWERED}/libSuperpoweredAndroid${ANDROID_ABI}.a
OpenSLES
log
android
)
And this is the source of the file I'm getting errors on:
#include <jni.h>
#include <android/log.h>
#include <string>
// unrelated includes
#include <libavformat/avformat.h>
#include <libavutil/dict.h>
#define log_write __android_log_write
#define log_print __android_log_print
// unrelated code parts
int print_file_data(const char *filePath) {
AVFormatContext *fmt_ctx = NULL;
AVDictionaryEntry *tag = NULL;
int ret;
if ((ret = avformat_open_input(&fmt_ctx, filePath, NULL, NULL)))
return ret;
while ((tag = av_dict_get(fmt_ctx->metadata, "", tag, AV_DICT_IGNORE_SUFFIX)))
log_print(ANDROID_LOG_DEBUG, "%s=%s\n", tag->key, tag->value);
avformat_close_input(&fmt_ctx);
return 0;
}
And finally the errors themselves:
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:externalNativeBuildDebug'.
> Build command failed.
Error while executing process /home/hamed/dev/android-tools/android-sdk-linux/cmake/3.6.4111459/bin/cmake with arguments {--build /home/hamed/dev/projects/canto/Canto/app/.externalNativeBuild/cmake/debug/x86 --target Canto}
[1/1] Linking CXX shared library ../../../../build/intermediates/cmake/debug/obj/x86/libCanto.so
FAILED: : && /home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ --target=i686-none-linux-android16 --gcc-toolchain=/home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64 --sysroot=/home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/sysroot -fPIC -isystem /home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/sysroot/usr/include/i686-linux-android -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -mstackrealign -Wa,--noexecstack -Wformat -Werror=format-security -std=c++11 -fsigned-char -I/home/hamed/dev/projects/canto/Canto/app/../Superpowered -I/home/hamed/dev/projects/canto/Canto/app/../ffmpeg -O0 -fno-limit-debug-info -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libatomic.a -nostdlib++ --sysroot /home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/platforms/android-16/arch-x86 -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -L/home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86 -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libCanto.so -o ../../../../build/intermediates/cmake/debug/obj/x86/libCanto.so CMakeFiles/Canto.dir/src/main/cpp/Dubsmash.cpp.o CMakeFiles/Canto.dir/src/main/cpp/Karaoke.cpp.o CMakeFiles/Canto.dir/src/main/cpp/Singing.cpp.o CMakeFiles/Canto.dir/src/main/cpp/EditDubsmash.cpp.o CMakeFiles/Canto.dir/home/hamed/dev/projects/canto/Canto/Superpowered/AndroidIO/SuperpoweredAndroidAudioIO.cpp.o ../../../../build/intermediates/cmake/debug/obj/x86/libavutil.so ../../../../build/intermediates/cmake/debug/obj/x86/libavformat.so ../../../../../Superpowered/libSuperpoweredAndroidx86.a -lOpenSLES -llog -landroid -latomic -lm "/home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86/libc++_static.a" "/home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86/libc++abi.a" "/home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86/libandroid_support.a" && :
/home/hamed/dev/projects/canto/Canto/app/src/main/cpp/Dubsmash.cpp:295: error: undefined reference to 'avformat_open_input(AVFormatContext**, char const*, AVInputFormat*, AVDictionary**)'
/home/hamed/dev/projects/canto/Canto/app/src/main/cpp/Dubsmash.cpp:298: error: undefined reference to 'av_dict_get(AVDictionary const*, char const*, AVDictionaryEntry const*, int)'
/home/hamed/dev/projects/canto/Canto/app/src/main/cpp/Dubsmash.cpp:301: error: undefined reference to 'avformat_close_input(AVFormatContext**)'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.
Obviously the linker can not find the needed libraries, but why?!
UPDATE
This is the result of running nm on libavutil.so:
0000000000000510 t atexit
0000000000000500 t __atexit_handler_wrapper
0000000000002008 A __bss_start
U __cxa_atexit
U __cxa_finalize
0000000000002000 d __dso_handle
0000000000001dd8 d _DYNAMIC
0000000000002008 A _edata
00000000000004e0 t __emutls_unregister_key
0000000000002008 A _end
00000000000005e8 r __FRAME_END__
0000000000001fd8 d _GLOBAL_OFFSET_TABLE_
0000000000000258 r ndk_build_number
0000000000000218 r ndk_version
0000000000000200 r note_android_ident
0000000000000214 r note_data
0000000000000298 r note_end
000000000000020c r note_name
00000000000004d0 t __on_dlclose
00000000000004f0 t __on_dlclose_late
and on libavformat:
0000000000000520 t atexit
0000000000000510 t __atexit_handler_wrapper
0000000000002008 A __bss_start
U __cxa_atexit
U __cxa_finalize
0000000000002000 d __dso_handle
0000000000001dd8 d _DYNAMIC
0000000000002008 A _edata
00000000000004f0 t __emutls_unregister_key
0000000000002008 A _end
00000000000005f8 r __FRAME_END__
0000000000001fd8 d _GLOBAL_OFFSET_TABLE_
0000000000000258 r ndk_build_number
0000000000000218 r ndk_version
0000000000000200 r note_android_ident
0000000000000214 r note_data
0000000000000298 r note_end
000000000000020c r note_name
00000000000004e0 t __on_dlclose
0000000000000500 t __on_dlclose_late
UPDATE 2
I applied #szatmary suggestion and finally managed to to build the apk file but upon reaching the System.loadLibrary call an exception occurs indicating that the linker can not find libavutil.so.56. I tried changing the address of the library in the cmake file to actually contain the version numbered lib file to no avail:
java.lang.UnsatisfiedLinkError: dlopen failed: library "libavutil.so.56" not found
at java.lang.Runtime.loadLibrary0(Runtime.java:1016)
at java.lang.System.loadLibrary(System.java:1657)
at com.hmomeni.canto.activities.EditActivity.<init>(EditActivity.kt:26)
at java.lang.Class.newInstance(Native Method)
at android.app.Instrumentation.newActivity(Instrumentation.java:1174)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2669)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

ffmpeg is written in C, It links different than C++ due to name mangling.
remove the set_target_properties LINKER_LANGUAGE CXX stuff
set_target_properties(avcodec PROPERTIES LINKER_LANGUAGE CXX)
and wrap the lib includes
extern "C" {
#include <libavformat/avformat.h>
#include <libavutil/dict.h>
}

Compiling libcurl for Android 64

I'm trying to create a Android 64-bit libcurl static library with SSL support.
I first compile OpenSSL with the help of this script https://github.com/cocochpie/android-openssl/blob/master/build-all-arch.sh. I've modified it so that it only builds for Android 64-bit and I see the following output:
ANDROID_TOOLS = aarch64-linux-android-gcc aarch64-linux-android-gcc-ranlib aarch64-linux-android-ld
Error: ANDROID_SYSROOT is not valid. Please edit this script.
CHECK_CROSS_COMPILER =
arch = arm64
ANDROID_NDK_ROOT: /opt/android/ndk-bundle
ANDROID_ARCH: arch-arm64
ANDROID_EABI: aarch64-linux-android-4.9
ANDROID_API: android-19
ANDROID_SYSROOT: /opt/android/ndk-bundle/platforms/android-19/arch-arm64
ANDROID_TOOLCHAIN: /opt/android/ndk-bundle/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin
FIPS_SIG: /openssl-1.1.0g/util/incore
CROSS_COMPILE:
ANDROID_DEV: /opt/android/ndk-bundle/platforms/android-19/arch-arm64/usr
CROSS COMPILE ENV :
Can't open Makefile.org: No such file or directory.
Configuring OpenSSL version 1.1.0g (0x1010007fL)
no-afalgeng [forced] OPENSSL_NO_AFALGENG
no-apps [forced] OPENSSL_NO_APPS
no-asan [default] OPENSSL_NO_ASAN
no-asm [option] OPENSSL_NO_ASM
no-capieng [forced] OPENSSL_NO_CAPIENG
no-comp [option] OPENSSL_NO_COMP (skip dir)
no-crypto-mdebug [default] OPENSSL_NO_CRYPTO_MDEBUG
no-crypto-mdebug-backtrace [default] OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
no-dynamic-engine [forced]
no-ec_nistp_64_gcc_128 [default] OPENSSL_NO_EC_NISTP_64_GCC_128
no-egd [default] OPENSSL_NO_EGD
no-engine [option] OPENSSL_NO_ENGINE (skip engines)
no-fuzz-afl [default] OPENSSL_NO_FUZZ_AFL
no-fuzz-libfuzzer [default] OPENSSL_NO_FUZZ_LIBFUZZER
no-heartbeats [default] OPENSSL_NO_HEARTBEATS
no-hw [option] OPENSSL_NO_HW
no-md2 [default] OPENSSL_NO_MD2 (skip dir)
no-msan [default] OPENSSL_NO_MSAN
no-rc5 [default] OPENSSL_NO_RC5 (skip dir)
no-sctp [default] OPENSSL_NO_SCTP
no-shared [option]
no-ssl-trace [default] OPENSSL_NO_SSL_TRACE
no-ssl3 [option] OPENSSL_NO_SSL3
no-ssl3-method [default] OPENSSL_NO_SSL3_METHOD
no-stdio [option] OPENSSL_NO_STDIO
no-tests [forced] OPENSSL_NO_TESTS
no-threads [option]
no-ubsan [default] OPENSSL_NO_UBSAN
no-unit-test [default] OPENSSL_NO_UNIT_TEST
no-weak-ssl-ciphers [default] OPENSSL_NO_WEAK_SSL_CIPHERS
no-zlib [option]
no-zlib-dynamic [default]
Configuring for linux-generic64
CC =arm-linux-androideabi-gcc
CFLAG =-Wall -O3 -fPIC -mandroid -I/opt/android/ndk-bundle/platforms/android-19/arch-arm64/usr/include -B/opt/android/ndk-bundle/platforms/android-19/arch-arm64/usr//lib -O3 -fomit-frame-pointer -Wall
SHARED_CFLAG =-fPIC -DOPENSSL_USE_NODELETE
DEFINES =DSO_DLFCN HAVE_DLFCN_H NDEBUG OPENSSL_NO_DYNAMIC_ENGINE OPENSSL_PIC B_ENDIAN SHARED_EXTENSION=.so OPENSSL_PIC DSO_DLFCN HAVE_DLFCN_H
LFLAG =
PLIB_LFLAG =
EX_LIBS =-ldl
APPS_OBJ =
CPUID_OBJ =mem_clr.o
UPLINK_OBJ =
BN_ASM =bn_asm.o
EC_ASM =
DES_ENC =des_enc.o fcrypt_b.o
AES_ENC =aes_core.o aes_cbc.o
BF_ENC =bf_enc.o
CAST_ENC =c_enc.o
RC4_ENC =rc4_enc.o rc4_skey.o
RC5_ENC =rc5_enc.o
MD5_OBJ_ASM =
SHA1_OBJ_ASM =
RMD160_OBJ_ASM=
CMLL_ENC =camellia.o cmll_misc.o cmll_cbc.o
MODES_OBJ =
PADLOCK_OBJ =
CHACHA_ENC =chacha_enc.o
POLY1305_OBJ =
BLAKE2_OBJ =
PROCESSOR =
RANLIB =arm-linux-androideabi-ranlib
ARFLAGS =
PERL =/usr/bin/perl
This step appears to complete successfully as the /openssl-1.1.0g directory ends up with a libssl.a and libcrypto.a as I would expect.
I then download curl and run the following configuration:
./configure \
--host=$CHOST \
--target=aarch64-linux-android \
--with-ssl=/openssl-1.1.0g \
--with-zlib \
--enable-ftp \
--enable-http \
--enable-ipv6 \
--enable-static \
--disable-dict \
--disable-file \
--disable-gopher \
--disable-imap \
--disable-ldap \
--disable-ldaps \
--disable-manual \
--disable-pop3 \
--disable-proxy \
--disable-rtsp \
--disable-shared \
--disable-smb \
--disable-smtp \
--disable-sspi \
--disable-telnet \
--disable-tftp \
--without-gnutls \
--without-libidn \
--without-librtmp
The output of this command is:
curl version: 7.56.1
Host setup: aarch64-unknown-linux-android
Install prefix: /usr/local
Compiler: arm-linux-androideabi-gcc
SSL support: no (--with-{ssl,gnutls,nss,polarssl,mbedtls,cyassl,axtls,winssl,darwinssl} )
SSH support: no (--with-libssh2)
zlib support: enabled
GSS-API support: no (--with-gssapi)
TLS-SRP support: no (--enable-tls-srp)
resolver: POSIX threaded
IPv6 support: enabled
Unix sockets support: enabled
IDN support: no (--with-{libidn2,winidn})
Build libcurl: Shared=no, Static=yes
Built-in manual: no (--enable-manual)
--libcurl option: enabled (--disable-libcurl-option)
Verbose errors: enabled (--disable-verbose)
SSPI support: no (--enable-sspi)
ca cert bundle: no
ca cert path: no
ca fallback: no
LDAP support: no (--enable-ldap / --with-ldap-lib / --with-lber-lib)
LDAPS support: no (--enable-ldaps)
RTSP support: no (--enable-rtsp)
RTMP support: no (--with-librtmp)
metalink support: no (--with-libmetalink)
PSL support: no (libpsl not found)
HTTP2 support: disabled (--with-nghttp2)
Protocols: FTP HTTP
If I'm interpreting this correctly the libcurl config is not finding the SSL library and building without SSL support.
Is that correct? If so, I would guess that this would happen if a) it cannot find the required files or b) it does find the required files but they are compiled for a different architecture.
Can someone point out where I'm going wrong here?
UPDATE 1
As suggested I looked through the config.log file. This part looks suspicious:
COLLECT_GCC_OPTIONS='-o' 'conftest' '-v' '-march=armv7-a' '-mfloat-abi=softfp' '-mfpu=vfp' '-mthumb' '-D' '__ANDROID_API__=19' '-Werror=implicit-function-declaration' '-O2' '-Wno-system-headers' '-v' '-mandroid' '-march=armv7-a' '-mfloat-abi=softfp' '-mfpu=vfp' '-mthumb' '-D' '__ANDROID_API__=19' '-D' 'ANDROID' '-I' '/openssl-1.1.0g/include' '-I' '/openssl-1.1.0g/include/openssl' '-L/opt/android/toolchain-arm/include' '-march=armv7-a' '-L/openssl-1.1.0g/lib' '-mtls-dialect=gnu'
/opt/android/toolchain-arm/bin/../libexec/gcc/arm-linux-androideabi/4.9.x/collect2 -plugin /opt/android/toolchain-arm/bin/../libexec/gcc/arm-linux-androideabi/4.9.x/liblto_plugin.so -plugin-opt=/opt/android/toolchain-arm/bin/../libexec/gcc/arm-linux-androideabi/4.9.x/lto-wrapper -plugin-opt=-fresolution=/tmp/ccFgY2c5.res -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-ldl -plugin-opt=-pass-through=-lgcc --sysroot=/opt/android/toolchain-arm/sysroot --eh-frame-hdr -dynamic-linker /system/bin/linker -X -m armelf_linux_eabi -z noexecstack -z relro -z now -o conftest /opt/android/toolchain-arm/sysroot/usr/lib/crtbegin_dynamic.o -L/opt/android/toolchain-arm/include -L/openssl-1.1.0g/lib -L/opt/android/toolchain-arm/bin/../lib/gcc/arm-linux-androideabi/4.9.x/armv7-a/thumb -L/opt/android/toolchain-arm/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/lib/armv7-a/thumb -L/opt/android/toolchain-arm/bin/../lib/gcc/arm-linux-androideabi/4.9.x -L/opt/android/toolchain-arm/bin/../lib/gcc -L/opt/android/toolchain-arm/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/lib -L/opt/android/toolchain-arm/sysroot/usr/lib --fix-cortex-a8 /tmp/ccxx0SSC.o -lcrypto -lz -lgcc -lc -ldl -lgcc /opt/android/toolchain-arm/sysroot/usr/lib/crtend_android.o
/openssl-1.1.0g/lib/libcrypto.a(ui_openssl.o):ui_openssl.c:function close_console: error: undefined reference to 'stdin'
/openssl-1.1.0g/lib/libcrypto.a(ui_openssl.o):ui_openssl.c:function close_console: error: undefined reference to 'stderr'
/openssl-1.1.0g/lib/libcrypto.a(ui_openssl.o):ui_openssl.c:function read_string_inner: error: undefined reference to 'signal'
/openssl-1.1.0g/lib/libcrypto.a(ui_openssl.o):ui_openssl.c:function read_string_inner: error: undefined reference to 'tcsetattr'
/openssl-1.1.0g/lib/libcrypto.a(ui_openssl.o):ui_openssl.c:function read_string_inner: error: undefined reference to 'tcsetattr'
/openssl-1.1.0g/lib/libcrypto.a(ui_openssl.o):ui_openssl.c:function open_console: error: undefined reference to 'tcgetattr'
/openssl-1.1.0g/lib/libcrypto.a(ui_openssl.o):ui_openssl.c:function open_console: error: undefined reference to 'stdin'
/openssl-1.1.0g/lib/libcrypto.a(ui_openssl.o):ui_openssl.c:function open_console: error: undefined reference to 'stderr'
collect2: error: ld returned 1 exit status

I managed to find a fantastic script for building what I needed: https://github.com/leenjewel/openssl_for_ios_and_android.
The big take away for me here was that if you see 'SSL support: no' and you are expecting to see 'yes' then it's one of two things: 1) it cannot find the path to SSL or 2) the path might be there but the compiled SSL is for the wrong architecture.
As Daniel Stenberg mentioned config.log is your friend here.