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Question by dzaAlinea · Feb 19, 2020 at 11:44 AM · build-errorandroid buildil2cpp

Cant build for android

i get this error when i try to build for android an i am lost how to fix it. i realy hope someone have an idea what i do to get rid of this problem.

 Failed running C:\Program Files\Unity\Hub\Editor\2018.2.16f1\Editor\Data\il2cpp/build/il2cpp.exe --convert-to-cpp --emit-null-checks --enable-array-bounds-check --compile-cpp --libil2cpp-static --platform="Android" --architecture="ARMv7" --configuration="Release" --outputpath="C:\Users\lridza\Documents\dfl1_ios91\Alinea\Temp/StagingArea\assets\bin\Data\Native\armeabi-v7a\libil2cpp.so" --cachedirectory="C:\Users\lridza\Documents\dfl1_ios91\Alinea\Assets\..\Library\il2cpp_android_armeabi-v7a/il2cpp_cache" --additional-include-directories="C:\Program Files\Unity\Hub\Editor\2018.2.16f1\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\bdwgc/include" --additional-include-directories="C:\Program Files\Unity\Hub\Editor\2018.2.16f1\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\libil2cpp/include" --tool-chain-path="C:/Users/lridza/AppData/Local/Android/Sdk/android-ndk-r13b" --map-file-parser="C:\Program Files\Unity\Hub\Editor\2018.2.16f1\Editor\Data\Tools\MapFileParser\MapFileParser.exe" --assembly="C:\Users\lridza\Documents\dfl1_ios91\Alinea\Temp\StagingArea\assets\bin\Data\Managed\Assembly-CSharp-firstpass.dll" --assembly="C:\Users\lridza\Documents\dfl1_ios91\Alinea\Temp\StagingArea\assets\bin\Data\Managed\Assembly-CSharp.dll" --assembly="C:\Users\lridza\Documents\dfl1_ios91\Alinea\Temp\StagingArea\assets\bin\Data\Managed\Assembly-UnityScript.dll" --assembly="C:\Users\lridza\Documents\dfl1_ios91\Alinea\Temp\StagingArea\assets\bin\Data\Managed\UnityEngine.UI.dll" --assembly="C:\Users\lridza\Documents\dfl1_ios91\Alinea\Temp\StagingArea\assets\bin\Data\Managed\UnityEngine.dll" --assembly="C:\Users\lridza\Documents\dfl1_ios91\Alinea\Temp\StagingArea\assets\bin\Data\Managed\System.dll" --generatedcppdir="C:\Users\lridza\Documents\dfl1_ios91\Alinea\Temp\StagingArea\Il2Cpp\il2cppOutput" 
 
 stdout:
 Building libil2cpp.so with AndroidToolChain
     Output directory: C:\Users\lridza\Documents\dfl1_ios91\Alinea\Temp\StagingArea\assets\bin\Data\Native\armeabi-v7a
     Cache directory: C:\Users\lridza\Documents\dfl1_ios91\Alinea\Library\il2cpp_android_armeabi-v7a\il2cpp_cache
 ObjectFiles: 602 of which compiled: 602
     Time Compile: 34023 milliseconds Bulk_mscorlib_9.cpp
     Time Compile: 31993 milliseconds Il2CppAttributes.cpp
     Time Compile: 30606 milliseconds Bulk_Assembly-CSharp_3.cpp
     Time Compile: 19714 milliseconds Bulk_Assembly-CSharp_0.cpp
     Time Compile: 18630 milliseconds Bulk_System_3.cpp
     Time Compile: 18444 milliseconds Bulk_mscorlib_5.cpp
     Time Compile: 18123 milliseconds Bulk_System_8.cpp
     Time Compile: 17538 milliseconds Bulk_System.Xml_0.cpp
     Time Compile: 17381 milliseconds Bulk_mscorlib_7.cpp
     Time Compile: 17316 milliseconds Bulk_Assembly-CSharp_11.cpp
 Total compilation time: 391450 milliseconds.
 il2cpp.exe didn't catch exception: Unity.IL2CPP.Building.BuilderFailedException: C:\Users\lridza\AppData\Local\Android\Sdk\android-ndk-r13b\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++ @"C:\Users\lridza\AppData\Local\Temp\tmp12FB.tmp" -o "C:\Users\lridza\Documents\dfl1_ios91\Alinea\Library\il2cpp_android_armeabi-v7a\il2cpp_cache\linkresult_04C0E0F14D3EB22D012A2C1B832E2E09\libil2cpp.so" -shared -Wl,-soname,libil2cpp.so -Wl,--no-undefined -Wl,-z,noexecstack -Wl,--gc-sections -Wl,--build-id --sysroot "C:\Users\lridza\AppData\Local\Android\Sdk\android-ndk-r13b\platforms\android-16\arch-arm" -gcc-toolchain "C:\Users\lridza\AppData\Local\Android\Sdk\android-ndk-r13b\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64" -target armv7-none-linux-androideabi -Wl,--wrap,sigaction -L "C:\Users\lridza\AppData\Local\Android\Sdk\android-ndk-r13b\sources\cxx-stl\gnu-libstdc++\4.9\libs\armeabi-v7a" -lgnustl_static -llog -Xlinker -Map="C:\Users\lridza\Documents\dfl1_ios91\Alinea\Library\il2cpp_android_armeabi-v7a\il2cpp_cache\linkresult_04C0E0F14D3EB22D012A2C1B832E2E09\libil2cpp.map" -rdynamic -fuse-ld=bfd.exe
 
 C:/Users/lridza/Documents/dfl1_ios91/Alinea/Library/il2cpp_android_armeabi-v7a/il2cpp_cache/547CB9652F389AE97AB40F71BF682ACC.o: In function `ScreenshotManager_saveToGallery_m3533703665':
 C:\Users\lridza\Documents\dfl1_ios91\Alinea\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp-firstpass_0.cpp:4240: undefined reference to `saveToGallery'
 clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)
 
 
    ved Unity.IL2CPP.Building.CppProgramBuilder.PostprocessObjectFiles(HashSet`1 objectFiles, CppToolChainContext toolChainContext)
    ved Unity.IL2CPP.Building.CppProgramBuilder.Build(IBuildStatistics& statistics)
    ved il2cpp.Program.DoRun(String[] args)
    ved il2cpp.Program.Run(String[] args)
    ved il2cpp.Program.Main(String[] args)
 stderr:
 
 Ikke-afviklet undtagelse: Unity.IL2CPP.Building.BuilderFailedException: C:\Users\lridza\AppData\Local\Android\Sdk\android-ndk-r13b\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++ @"C:\Users\lridza\AppData\Local\Temp\tmp12FB.tmp" -o "C:\Users\lridza\Documents\dfl1_ios91\Alinea\Library\il2cpp_android_armeabi-v7a\il2cpp_cache\linkresult_04C0E0F14D3EB22D012A2C1B832E2E09\libil2cpp.so" -shared -Wl,-soname,libil2cpp.so -Wl,--no-undefined -Wl,-z,noexecstack -Wl,--gc-sections -Wl,--build-id --sysroot "C:\Users\lridza\AppData\Local\Android\Sdk\android-ndk-r13b\platforms\android-16\arch-arm" -gcc-toolchain "C:\Users\lridza\AppData\Local\Android\Sdk\android-ndk-r13b\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64" -target armv7-none-linux-androideabi -Wl,--wrap,sigaction -L "C:\Users\lridza\AppData\Local\Android\Sdk\android-ndk-r13b\sources\cxx-stl\gnu-libstdc++\4.9\libs\armeabi-v7a" -lgnustl_static -llog -Xlinker -Map="C:\Users\lridza\Documents\dfl1_ios91\Alinea\Library\il2cpp_android_armeabi-v7a\il2cpp_cache\linkresult_04C0E0F14D3EB22D012A2C1B832E2E09\libil2cpp.map" -rdynamic -fuse-ld=bfd.exe
 
 C:/Users/lridza/Documents/dfl1_ios91/Alinea/Library/il2cpp_android_armeabi-v7a/il2cpp_cache/547CB9652F389AE97AB40F71BF682ACC.o: In function `ScreenshotManager_saveToGallery_m3533703665':
 C:\Users\lridza\Documents\dfl1_ios91\Alinea\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp-firstpass_0.cpp:4240: undefined reference to `saveToGallery'
 clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)
 
 
    ved Unity.IL2CPP.Building.CppProgramBuilder.PostprocessObjectFiles(HashSet`1 objectFiles, CppToolChainContext toolChainContext)
    ved Unity.IL2CPP.Building.CppProgramBuilder.Build(IBuildStatistics& statistics)
    ved il2cpp.Program.DoRun(String[] args)
    ved il2cpp.Program.Run(String[] args)
    ved il2cpp.Program.Main(String[] args)
 
 UnityEngine.Debug:LogError(Object)
 UnityEditorInternal.Runner:RunProgram(Program, String, String, String, CompilerOutputParserBase) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildUtils.cs:128)
 UnityEditorInternal.Runner:RunManagedProgram(String, String, String, CompilerOutputParserBase, Action`1) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildUtils.cs:73)
 UnityEditorInternal.IL2CPPBuilder:RunIl2CppWithArguments(List`1, Action`1, String) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:380)
 UnityEditorInternal.IL2CPPBuilder:ConvertPlayerDlltoCpp(ICollection`1, String, String, Boolean) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:361)
 UnityEditorInternal.IL2CPPBuilder:Run() (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:178)
 UnityEditorInternal.IL2CPPUtils:RunIl2Cpp(String, String, IIl2CppPlatformProvider, Action`1, RuntimeClassRegistry) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:35)
 UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
 
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avatar image JPhilipp · Feb 19, 2020 at 12:20 PM 0
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What happens if you upgrade to the latest stable version of Unity (if you want to try)?

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Answer by JoshPeterson · Feb 19, 2020 at 01:20 PM

This failure occurs because the code in the project has extern methods in C#. Methods marked as extern with a the [Dllimport("__Internal")] attribute must be present in a native library that is linked with the Unity player when building with the IL2CPP scripting backend.

For example, this in this project one function which causes this issue is named: saveToGallery

You have two options:

  1. Build a native library with all of the methods marked as extern with the [Dllimport("__Internal")] attribute for the target platform and architecture of the player. See this documentation for details about native plugins: https://docs.unity3d.com/Manual/NativePlugins.html

  2. Remove the C# code which defines this extern method. You can do that with platform dependent compilation: https://docs.unity3d.com/Manual/PlatformDependentCompilation.html

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