Android NDK CMakeLists.txt：エラー：未定義の参照：

Question

私は周りを見回しましたが、Android.mkとApplication.mkを使用するソリューションを見つけることができました。 CMakeLists.txt私はそれらのファイルのいずれかを必要としないことを使用して考えることで私は正しいですか？これはAndroid NDKを使用した最初のベンチャーです。

私はの私のCMakeLists.txtに基づいており、私のライブラリはnativelibです。 .cppファイルがヘッダーファイルの参照を取得できないようです。私は何か間違っているのですか？それはうまく構築されますが、コンパイル時にこれらのエラーがスローされます。

CMakeLists.txt：

cmake_minimum_required(VERSION 3.4.1) 

# Creates and names a library, sets it as either STATIC 
# or SHARED, and provides the relative paths to its source code. 
# You can define multiple libraries, and CMake builds it for you. 
# Gradle automatically packages shared libraries with your APK. 

add_library(# Sets the name of the library. 
      nativelib 

      # Sets the library as a shared library. 
      SHARED 

      # Provides a relative path to your source file(s). 
      # Associated headers in the same location as their source 
      # file are automatically included. 
      G:/Git/NDKTest/app/src/main/jni/nativelib.cpp) 

# Searches for a specified prebuilt library and stores the path as a 
# variable. Because system libraries are included in the search path by 
# default, you only need to specify the name of the public NDK library 
# you want to add. CMake verifies that the library exists before 
# completing its build. 

find_library(# Sets the name of the path variable. 
       log-lib 

       # Specifies the name of the NDK library that 
       # you want CMake to locate. 
       log) 

# Specifies libraries CMake should link to your target library. You 
# can link multiple libraries, such as libraries you define in the 
# build script, prebuilt third-party libraries, or system libraries. 

target_link_libraries(# Specifies the target library. 
         nativelib 

         # Links the target library to the log library 
         # included in the NDK. 
         ${log-lib}) 

//////////////////////////////////////////////////////////////  
////////////////////////////////////////////////////////////// 
// Below here is copy and pasted from the SuperpoweredExample 
////////////////////////////////////////////////////////////// 
////////////////////////////////////////////////////////////// 

set(
    PATH_TO_SUPERPOWERED 
    "C:/Users/j/Downloads/Superpowered/Superpowered" 
) 

message(${ANDROID_ABI}) 

file(GLOB CPP_FILES "*.cpp") 

add_library(
    SuperpoweredExample 
    SHARED 
    ${CPP_FILES} 
    ${PATH_TO_SUPERPOWERED}/AndroidIO/SuperpoweredAndroidAudioIO.cpp 
) 

include_directories(src/main/jni) 
include_directories(${PATH_TO_SUPERPOWERED}) 

target_link_libraries(
    SuperpoweredExample 
    log 
    android 
    OpenSLES 
    ${PATH_TO_SUPERPOWERED}/libSuperpoweredAndroid${ANDROID_ABI}.a 
    nativelib 
) 

スタックトレース：、同じエラーをnativelibするnativelibから名前を変更

Error:FAILURE: Build failed with an exception. 

* What went wrong: 
Execution failed for task ':app:externalNativeBuildDebug'. 
> Build command failed. 
Error while executing 'G:\sdk1\cmake\3.6.3155560\bin\cmake.exe' with arguments {--build G:\Git\NDKTest\app\.externalNativeBuild\cmake\debug\x86 --target nativelib} 
[1/2] Building CXX object CMakeFiles/nativelib.dir/nativelib.cpp.o 
[2/2] Linking CXX shared library G:\Git\NDKTest\app\build\intermediates\cmake\debug\obj\x86\libnativelib.so 
FAILED: cmd.exe /C "cd . && G:\sdk1\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe -target i686-none-linux-android -gcc-toolchain G:/sdk1/ndk-bundle/toolchains/x86-4.9/prebuilt/windows-x86_64 --sysroot=G:/sdk1/ndk-bundle/platforms/android-16/arch-x86 -fPIC -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -Wa,--noexecstack -Wformat -Werror=format-security -fno-exceptions -fno-rtti -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -Wa,--noexecstack -Wformat -Werror=format-security -fno-exceptions -fno-rtti -fsigned-char -Inull -O0 -fno-limit-debug-info -O0 -fno-limit-debug-info -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libnativelib.so -o G:\Git\NDKTest\app\build\intermediates\cmake\debug\obj\x86\libnativelib.so CMakeFiles/nativelib.dir/nativelib.cpp.o -llog -lm "G:/sdk1/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/x86/libgnustl_static.a" && cd ." 
G:\Git\NDKTest\app\src\main\jni/nativelib.cpp:16: error: undefined reference to 'SuperpoweredRoll::SuperpoweredRoll(unsigned int)' 
    G:\Git\NDKTest\app\src\main\jni/nativelib.cpp:17: error: undefined reference to 'SuperpoweredFilter::SuperpoweredFilter(SuperpoweredFilterType, unsigned int)' 
    G:\Git\NDKTest\app\src\main\jni/nativelib.cpp:18: error: undefined reference to 'SuperpoweredFlanger::SuperpoweredFlanger(unsigned int)' 
    G:\Git\NDKTest\app\src\main\jni/nativelib.cpp:19: error: undefined reference to 'SuperpoweredRecorder::SuperpoweredRecorder(char const*, unsigned int, unsigned int)' 
    G:\Git\NDKTest\app\src\main\jni/nativelib.cpp:21: error: undefined reference to 'SuperpoweredAndroidAudioIO::SuperpoweredAndroidAudioIO(int, int, bool, bool, bool (*)(void*, short*, int, int), void*, int, int, int)' 
    G:\Git\NDKTest\app\src\main\jni/nativelib.cpp:28: error: undefined reference to 'SuperpoweredRecorder::stop()' 
    G:\Git\NDKTest\app\src\main\jni/nativelib.cpp:30: error: undefined reference to 'SuperpoweredRecorder::start(char const*)' 
    G:\Git\NDKTest\app\src\main\jni/nativelib.cpp:37: error: undefined reference to 'SuperpoweredRecorder::process(float*, float*, unsigned int)' 
    G:\Git\NDKTest\app\src\main\jni/nativelib.cpp:38: error: undefined reference to 'SuperpoweredFloatToShortInt(float*, short*, unsigned int, unsigned int)' 
    G:\Git\NDKTest\app\src\main\jni/nativelib.cpp:43: error: undefined reference to 'SuperpoweredAndroidAudioIO::~SuperpoweredAndroidAudioIO()' 
    G:\Git\NDKTest\app\src\main\jni/nativelib.cpp:44: error: undefined reference to 'SuperpoweredRecorder::~SuperpoweredRecorder()' 
    clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation) 
    ninja: build stopped: subcommand failed. 


* Try: 
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. 

。

target_link_libraries()の周辺にエラーがあると感じています。CMakeLists.txtです。 NativeLibコードと既存のSuperpoweredExampleコードをリンクしようとしています。

Answer 1

"nativelib"をリンクする前にSuperpoweredの例をリンクすると、リンカが "nativelib"で使用されるスーパーパワーの部品を見つけることができないと思います。