IL2CPP build error, missing libatomic.a

Hi, I am building android app bundle on unity 2019.2.14f1 with bundled ndk - r16b, with this configuration:
and I am getting following error:

Failed running C:\Program Files\Unity\Hub\Editor\2019.2.14f1\Editor\Data\il2cpp/build/il2cpp.exe --convert-to-cpp --emit-null-checks --enable-array-bounds-check --dotnetprofile="unityaot" --compile-cpp --libil2cpp-static --platform="Android" --architecture="ARMv7" --configuration="Release" --outputpath="C:\Users\Martin Soukup\Documents\babis\Temp\StagingArea\assets\bin\Data\Native\armeabi-v7a\libil2cpp.so" --cachedirectory="C:\Users\Martin Soukup\Documents\babis\Assets\..\Library\il2cpp_android_armeabi-v7a/il2cpp_cache" --additional-include-directories="C:/Program Files/Unity/Hub/Editor/2019.2.14f1/Editor/Data/PlaybackEngines/AndroidPlayer/Tools\bdwgc/include" --additional-include-directories="C:/Program Files/Unity/Hub/Editor/2019.2.14f1/Editor/Data/PlaybackEngines/AndroidPlayer/Tools\libil2cpp/include" --tool-chain-path="C:/Program Files/Unity/Hub/Editor/2019.2.14f1/Editor/Data/PlaybackEngines/AndroidPlayer/NDK/android-ndk-r16b" --profiler-report --map-file-parser="C:/Program Files/Unity/Hub/Editor/2019.2.14f1/Editor/Data/Tools/MapFileParser/MapFileParser.exe" --directory="C:/Users/Martin Soukup/Documents/babis/Temp/StagingArea/assets/bin/Data/Managed" --generatedcppdir="C:/Users/Martin Soukup/Documents/babis/Temp/StagingArea/Il2Cpp/il2cppOutput"

stdout:
Building libil2cpp.so with AndroidToolChain
Output directory: C:\Users\Martin Soukup\Documents\babis\Temp\StagingArea\assets\bin\Data\Native\armeabi-v7a
Cache directory: C:\Users\Martin Soukup\Documents\babis\Library\il2cpp_android_armeabi-v7a\il2cpp_cache
ObjectFiles: 266 of which compiled: 0
Total compilation time: 240 milliseconds.
il2cpp.exe didn't catch exception: Unity.IL2CPP.Building.BuilderFailedException: C:\Program Files\Unity\Hub\Editor\2019.2.14f1\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\android-ndk-r16b\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++ @"C:\Users\Martin Soukup\AppData\Local\Temp\tmpCDCA.tmp" -o "C:\Users\Martin Soukup\Documents\babis\Library\il2cpp_android_armeabi-v7a\il2cpp_cache\linkresult_C1C6CC4701FB0A04EBDD03269E4A054A\libil2cpp.so" -shared -Wl,-soname,libil2cpp.so -Wl,--no-undefined -Wl,-z,noexecstack -Wl,--gc-sections -Wl,--build-id --sysroot "C:\Program Files\Unity\Hub\Editor\2019.2.14f1\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\android-ndk-r16b\platforms\android-16\arch-arm" -gcc-toolchain "C:\Program Files\Unity\Hub\Editor\2019.2.14f1\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\android-ndk-r16b\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64" -target armv7-none-linux-androideabi -Wl,--wrap,sigaction -L "C:\Program Files\Unity\Hub\Editor\2019.2.14f1\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\android-ndk-r16b\sources\cxx-stl\gnu-libstdc++\4.9\libs\armeabi-v7a" -lgnustl_static -latomic -llog -rdynamic -fuse-ld=gold.exe

C:\Program Files\Unity\Hub\Editor\2019.2.14f1\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\android-ndk-r16b\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld.gold.exe: error: cannot open C:\Program Files\Unity\Hub\Editor\2019.2.14f1\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\android-ndk-r16b\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/lib/../lib/armv7-a/libatomic.a: No such file or directory
clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)


v Unity.IL2CPP.Building.CppProgramBuilder.PostprocessObjectFiles(HashSet`1 objectFiles, CppToolChainContext toolChainContext)
v Unity.IL2CPP.Building.CppProgramBuilder.Build(IBuildStatistics& statistics)
v il2cpp.Program.DoRun(String[] args)
v il2cpp.Program.Run(String[] args)
v il2cpp.Program.Main(String[] args)
stderr:

Neo�et�en� v�jimka: Unity.IL2CPP.Building.BuilderFailedException: C:\Program Files\Unity\Hub\Editor\2019.2.14f1\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\android-ndk-r16b\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++ @"C:\Users\Martin Soukup\AppData\Local\Temp\tmpCDCA.tmp" -o "C:\Users\Martin Soukup\Documents\babis\Library\il2cpp_android_armeabi-v7a\il2cpp_cache\linkresult_C1C6CC4701FB0A04EBDD03269E4A054A\libil2cpp.so" -shared -Wl,-soname,libil2cpp.so -Wl,--no-undefined -Wl,-z,noexecstack -Wl,--gc-sections -Wl,--build-id --sysroot "C:\Program Files\Unity\Hub\Editor\2019.2.14f1\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\android-ndk-r16b\platforms\android-16\arch-arm" -gcc-toolchain "C:\Program Files\Unity\Hub\Editor\2019.2.14f1\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\android-ndk-r16b\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64" -target armv7-none-linux-androideabi -Wl,--wrap,sigaction -L "C:\Program Files\Unity\Hub\Editor\2019.2.14f1\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\android-ndk-r16b\sources\cxx-stl\gnu-libstdc++\4.9\libs\armeabi-v7a" -lgnustl_static -latomic -llog -rdynamic -fuse-ld=gold.exe

C:\Program Files\Unity\Hub\Editor\2019.2.14f1\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\android-ndk-r16b\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld.gold.exe: error: cannot open C:\Program Files\Unity\Hub\Editor\2019.2.14f1\Editor\Data\PlaybackEngines\AndroidPlayer\NDK\android-ndk-r16b\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/lib/../lib/armv7-a/libatomic.a: No such file or directory
clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)


v Unity.IL2CPP.Building.CppProgramBuilder.PostprocessObjectFiles(HashSet`1 objectFiles, CppToolChainContext toolChainContext)
v Unity.IL2CPP.Building.CppProgramBuilder.Build(IBuildStatistics& statistics)
v il2cpp.Program.DoRun(String[] args)
v il2cpp.Program.Run(String[] args)
v 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:126)
UnityEditorInternal.Runner:RunManagedProgram(String, String, String, CompilerOutputParserBase, Action`1) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildUtils.cs:71)
UnityEditorInternal.IL2CPPBuilder:RunIl2CppWithArguments(List`1, Action`1, String) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:503)
UnityEditorInternal.IL2CPPBuilder:ConvertPlayerDlltoCpp(String, String, String, Boolean) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:484)
UnityEditorInternal.IL2CPPBuilder:Run() (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:334)
UnityEditorInternal.IL2CPPUtils:RunIl2Cpp(String, String, IIl2CppPlatformProvider, Action`1, RuntimeClassRegistry) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:63)
UnityEditor.BuildPlayerWindow:BuildPlayerAndRun() (at C:/buildslave/unity/build/Editor/Mono/BuildPlayerWindow.cs:122)
​

The only clue for me is libatomic.a: No such file or directory , a file missing, but I dont know what to do since I didnt mess with bundled ndk, I just added ndk with instalation through unity hub

 

Hi, in the end I came across this answer: https://answers.unity.com/questions/1676570/il2cpp-android-build-error-2019219f1.html and it helped me. I manually downloaded ndk16 inside android studio and then pointed unity to use it. I dont get that error anymore

 

Hi!
Glad you found solution - I also found one.
I had exactly the same error.
After unity update when I tried to compile 64bit Unity showed that it cannot find NDK, so I unchecked "Android NDK Installed with Unity"
It showed path:

C:/Program Files/Unity/Hub/Editor/2019.2.14f1/Editor/Data/PlaybackEngines/AndroidPlayer/NDK

I checked folder path and saw that NDK has one more folder: /android-ndk-r16b
So I added it at the end of path.

Unity now found NDK but threw an error exactly like yours.

I copied folder content from
C:/Program Files/Unity/Hub/Editor/2019.2.14f1/Editor/Data/PlaybackEngines/AndroidPlayer/NDK/android-ndk-r16b

to upper folder:
C:/Program Files/Unity/Hub/Editor/2019.2.14f1/Editor/Data/PlaybackEngines/AndroidPlayer/NDK/

and CHECKED "Android NDK Installed with Unity" under Preferences and now all is working again!

 

Dude i owe you my life, have been dealing with this issue the whole day and this is the only thing that worked, thanks a lot!!

 

Moving NDK files helped indeed

 

Thank you sir!, this has fixed all my issues too!

If you are developing on Linux and having issues building Android NDK with Unity preferences recommended option for NDK, then download NDK and Cmake with Android SDK and link your preferences to those directories.



Now I can finally build Android Armv7 & Armv64 with Burst using ILCPP.

 

This issue is still present with Unity 2019.2.15f1 on Windows.
As outlined, manually fixing the broken NDK location resolved the issue:

Hi!
Glad you found solution - I also found one.
I had exactly the same error.
After unity update when I tried to compile 64bit Unity showed that it cannot find NDK, so I unchecked "Android NDK Installed with Unity"
It showed path:

C:/Program Files/Unity/Hub/Editor/2019.2.14f1/Editor/Data/PlaybackEngines/AndroidPlayer/NDK

I checked folder path and saw that NDK has one more folder: /android-ndk-r16b
So I added it at the end of path.

Unity now found NDK but threw an error exactly like yours.

I copied folder content from
C:/Program Files/Unity/Hub/Editor/2019.2.14f1/Editor/Data/PlaybackEngines/AndroidPlayer/NDK/android-ndk-r16b

to upper folder:
C:/Program Files/Unity/Hub/Editor/2019.2.14f1/Editor/Data/PlaybackEngines/AndroidPlayer/NDK/

and CHECKED "Android NDK Installed with Unity" under Preferences and now all is working again!

 

I've been stuck with this problem for about 2 days, it started after making the very wrong decision to upgrade Unity to version 2019.2.15, from this moment on things went downhill.
I tried to reinstall the whole thing and even the version I used before, but nothing else worked.
Moving NDK Files from (android-ndk-r16b) to ../NDK works.
Thanks guys, I was losing my mind.

 

Yeah fixed it for me as well on macOS with 2019.2.14. I mean WTF! Makes me wonder what the point of the Hub is!

Cheers.

 

EDIT: literally solved by unchecking and checking again both Use "Android NDK installed with Unity" and "Use Android SDK installed with Unity". What a comedy.
---
Doesn't work for me. On Unity 2019.2.16f, after moving the files, I get another error:

Win32Exception: ApplicationName='/Applications/Unity/Hub/Editor/2019.3.0b6/PlaybackEngines/AndroidPlayer/SDK/tools/bin/sdkmanager', CommandLine='--list', CurrentDirectory='/Users/DanjelRicci/ProgettiUnity3D/V-Speedway', Native error= Cannot find the specified file
System.Diagnostics.Process.StartWithCreateProcess (System.Diagnostics.ProcessStartInfo startInfo) (at <ae22a4e8f83c41d69684ae7f557133d9>:0)
System.Diagnostics.Process.Start () (at <ae22a4e8f83c41d69684ae7f557133d9>:0)
(wrapper remoting-invoke-with-check) System.Diagnostics.Process.Start()
UnityEditor.Utils.Program.Start (System.EventHandler exitCallback) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Utils/Program.cs:44)
UnityEditor.Utils.Program.Start () (at /Users/builduser/buildslave/unity/build/Editor/Mono/Utils/Program.cs:28)
UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.Command+WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) (at <21da158cd428404389e0b5a08ba9ea0a>:0)
UnityEditor.Android.SDKManager.UpdatePackagesList () (at <21da158cd428404389e0b5a08ba9ea0a>:0)
UnityEditor.Android.SDKManager.HighestVersionInstalled (UnityEditor.Android.SDKManager+Component tool) (at <21da158cd428404389e0b5a08ba9ea0a>:0)
UnityEditor.Android.PostProcessor.Tasks.CheckAndroidSDK+SDKToolsDetector.GetVersion () (at <21da158cd428404389e0b5a08ba9ea0a>:0)
UnityEditor.Android.PostProcessor.Tasks.CheckAndroidSDK+SDKComponentDetector.Detect (System.Version minVersion, UnityEditor.Android.PostProcessor.ProgressHandler onProgress) (at <21da158cd428404389e0b5a08ba9ea0a>:0)
UnityEditor.Android.PostProcessor.Tasks.CheckAndroidSDK.EnsureSDKComponentVersion (System.Version minVersion, UnityEditor.Android.PostProcessor.Tasks.CheckAndroidSDK+SDKComponentDetector detector) (at <21da158cd428404389e0b5a08ba9ea0a>:0)
UnityEditor.Android.PostProcessor.Tasks.CheckAndroidSDK.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context) (at <21da158cd428404389e0b5a08ba9ea0a>:0)
UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context) (at <21da158cd428404389e0b5a08ba9ea0a>:0)
UnityEditor.Android.PostProcessAndroidPlayer.PrepareForBuild (UnityEditor.BuildOptions options, UnityEditor.BuildTarget target) (at <21da158cd428404389e0b5a08ba9ea0a>:0)
UnityEditor.Android.AndroidBuildPostprocessor.PrepareForBuild (UnityEditor.BuildOptions options, UnityEditor.BuildTarget target) (at <21da158cd428404389e0b5a08ba9ea0a>:0)
UnityEditor.PostprocessBuildPlayer.PrepareForBuild (UnityEditor.BuildOptions options, UnityEditor.BuildTargetGroup targetGroup, UnityEditor.BuildTarget target) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/PostprocessBuildPlayer.cs:106)
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr) (at /Users/builduser/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:179)

 

It seems like they partly fixed the issue in version 2019.2.17f1 ..
I had only uncheck then click once browse (so in path "/2019.2.16f1/" changes to "/2019.2.17f1/") -> and check again check boxes under preferences - > External Tools (for JDK, NDK, SDK)

 

People of Unity 2021.1.whatever, its 2021, for 2021 the required ndk is r21d, which is not available on developer.android.com, but I saw a video on YT in there he downloaded a version from Android Studio, Channel name code prf, how to download ndk r21d.
(P.S. I haven't tried this yet, because i didnt wanted to install android studio on my Potato)

 

OMG, you saved my life!!! thanksss
your solution worked for me even its 2023 nowTT