Burst error

[ketourneau]

Hi,

We try to use GltFast 4.0 with DracoUnity 3.0.1 but got some burst errors when we load draco glb file. We use Unity 2020.3.9f1 LTS with Burst 1.4.8 on macos.

/Temp/Burst/burst-aotmapfenzj.il4/lib_burst_generated_part_0.o: _DecodeDracoMeshStep1
symbol(s) not found

While compiling job: System.Void Unity.Jobs.IJobExtensions/JobStruct`1<Draco.DracoNative/DecodeJob>::Execute(T&,System.IntPtr,System.IntPtr,Unity.Jobs.LowLevel.Unsafe.JobRanges&,System.Int32)
at <empty>:line 0

Unexpected exception Burst.Compiler.IL.Aot.AotLinkerException: The native link step failed. Check previous exception in the log - linker command line : ".../Library/PackageCache/com.unity.burst@1.4.8/.Runtime/hostmac/lld -flavor darwin -arch x86_64 -macosx_version_min 10.8 -sdk_version 10.9 -r -dylib -o ".../Temp/Burst/burst-aotmapfenzj.il4/bceef9978708ccba5c5983a7dc41dd2a.bundle" ".../Library/PackageCache/com.unity.burst@1.4.8/.Runtime/libs/burstRTL_m64.a" ".../Temp/Burst/burst-aotmapfenzj.il4/lib_burst_generated_part_0.o" ".../Temp/Burst/burst-aotmapfenzj.il4/lib_burst_generated_part_0_merged.o""
  at Burst.Compiler.IL.Aot.AotNativeLinkBase.RunNativeLinkerTool (System.String command, System.String arguments, System.String errorMessage, System.String commandType, System.String workingDirectory, System.Boolean muteOutputs) [0x000d0] in <6b9ca69063a2498c9988acea59759ba5>:0 
  at Burst.Compiler.IL.Aot.AotNativeLinkLLVMMacOS.Link (Burst.Backend.TargetCpu targetCpu, System.Collections.Generic.List`1[T] inputFiles, System.String outputFile, System.Boolean enableDebugInfo) [0x00118] in <6b9ca69063a2498c9988acea59759ba5>:0 
  at Burst.Compiler.IL.Aot.AotCompiler.Link (System.Collections.Generic.List`1[T] groups, System.String nameSuffix, Burst.Compiler.IL.Aot.AotCompilerOptions compilerOptions, System.IO.TextWriter consoleOut, System.IO.TextWriter consoleError) [0x001f8] in <6b9ca69063a2498c9988acea59759ba5>:0 
  at Burst.Compiler.IL.Jit.Providers.OnDiskJitProvider.BeginCompileModule (Burst.Backend.Module module, Burst.Compiler.IL.NativeCompiler nativeCompiler, Burst.Compiler.IL.NativeCompilerOptions options, Burst.Compiler.IL.Jit.JitOptions jitOptions, Burst.Compiler.IL.Helpers.Hash128& moduleHash, Burst.Compiler.IL.Jit.JitCacheManager jitCacheManager, Burst.Compiler.IL.Jit.GetExternalFunctionPointerDelegate getExternalFunctionPointer, System.Action& invokeBurstInitialize) [0x00089] in <6b9ca69063a2498c9988acea59759ba5>:0 
  at Burst.Compiler.IL.Jit.JitCompiler.CompileMethodInternal (Burst.Compiler.IL.Jit.JitResult result, System.Collections.Generic.List`1[T] methodsToCompile, Burst.Compiler.IL.Jit.JitOptions jitOptions) [0x00511] in <6b9ca69063a2498c9988acea59759ba5>:0 
  at Burst.Compiler.IL.Jit.JitCompiler.CompileMethods (Mono.Cecil.MethodReference[] methodReferences, Burst.Compiler.IL.Jit.JitOptions jitOptions) [0x0027a] in <6b9ca69063a2498c9988acea59759ba5>:0 
  at Burst.Compiler.IL.Jit.JitCompiler.CompileMethod (Mono.Cecil.MethodReference methodReference, Burst.Compiler.IL.Jit.JitOptions jitOptions) [0x0001c] in <6b9ca69063a2498c9988acea59759ba5>:0 
  at Burst.Compiler.IL.Jit.JitCompilerService+CompilerThreadContext.Compile (Burst.Compiler.IL.Jit.JitCompilerService+CompileJob job) [0x00468] in <6b9ca69063a2498c9988acea59759ba5>:0 

While compiling job: System.Void Unity.Jobs.IJobExtensions/JobStruct`1<Draco.DracoNative/DecodeJob>::Execute(T&,System.IntPtr,System.IntPtr,Unity.Jobs.LowLevel.Unsafe.JobRanges&,System.Int32)
at <empty>:line 0

[atteneder]

Thanks for reporting, I can confirm.

It should still work though (and fall back to non-Burst), right?

[ketourneau]

Yes, file is open but got errors in console

[ketourneau]

@atteneder I still have the problem with 3.0.2.

I try to update from 3.0.1 with package manager in unity. I try to uninstall/install DracoUnity with installer. I try to delete Library, Temp... unity folders and open again.

Undefined symbol: .../Temp/Burst/burst-aotfaqifuac.cyb/lib_burst_generated_part_0.o: _DecodeDracoMeshStep1
symbol(s) not found

While compiling job: System.Void Unity.Jobs.IJobExtensions/JobStruct`1<Draco.DracoNative/DecodeJob>::Execute(T&,System.IntPtr,System.IntPtr,Unity.Jobs.LowLevel.Unsafe.JobRanges&,System.Int32)
at <empty>:line 0

[atteneder]

@Blocovin Sorry to hear that, but it works on my machine(s) 🤷

DracoUnity 3.0.2 Unity 2019.4.26f1 Burst 1.4.8 glTFast 4.0.0

I'm afraid I'd need better steps to reproduce.

[ketourneau]

@atteneder This is how I reproduce:

• Create new project from Unity 2020.3.9f1 LTS (target iOS platform)
• Import GltFast 4.0.0
• Import DracoUnity 3.0.2
• Check if Burst 1.4.8 is installed
• Check if "Jobs/Brust/Enable compilation" is checked

Got errors

[atteneder]

@Blocovin

I created a new project and followed your steps 1:1 and didn't see any error.

I installed via OpenUPM installer (both glTFast and DracoUnity). Did you do it this way as well?

Burst was installed automatically (as dependency of DracoUnity). I noticed the Package Manager has a glitch, not showing it as installed in In Project view mode, but it was installed.

[ketourneau]

@atteneder

Yes I installed GltFast and DracoUnity with OpenUPM installer: GltFast installer & DracoUnity installer.

I noticed that I need to restart Unity after installing DracoUnity to correctly got Burst imported.

Do you have errors if you reopen the new project after DracoUnity installation ?

[ketourneau]

@atteneder

I found the problem, error was gone when I create project in another path.

It's not a problem with DracoUnity, so sorry for the inconvenience & thank you for the help !

Best regards

[atteneder]

@Blocovin

No worries. I'm glad you figured it out!