Development / Deep Profile Support build failing

Unity 2020.1.4f1, build works fine without the 'development build', 'autoconnect profiler' and 'deep profiling support' options ticked. With them ticked I get these errors trying to build:

Code (CSharp):

1. Failed running python -E "/Applications/Unity/Hub/Editor/2020.1.4f1/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/emcc" @"/Users/me/Documents/Summoner/Summoner/Assets/../Temp/emcc_arguments.resp"
2.  
3. stdout:
4. stderr:Value:   %19 = landingpad { i8*, i32 }          cleanupLLVM ERROR: Unrecognized struct valueTraceback (most recent call last):  File "/Applications/Unity/Hub/Editor/2020.1.4f1/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/emcc.py", line 3063, in <module>    sys.exit(run())  File "/Applications/Unity/Hub/Editor/2020.1.4f1/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/emcc.py", line 1780, in run    final = shared.Building.emscripten(final, append_ext=False, extra_args=extra_args)  File "/Applications/Unity/Hub/Editor/2020.1.4f1/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/tools/shared.py", line 2274, in emscripten    emscripten._main(cmdline)  File "/Applications/Unity/Hub/Editor/2020.1.4f1/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/emscripten.py", line 2233, in _main    return temp_files.run_and_clean(lambda: main(  File "/Applications/Unity/Hub/Editor/2020.1.4f1/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/tools/tempfiles.py", line 93, in run_and_clean    return func()  File "/Applications/Unity/Hub/Editor/2020.1.4f1/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/emscripten.py", line 2238, in <lambda>    DEBUG=DEBUG,  File "/Applications/Unity/Hub/Editor/2020.1.4f1/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/emscripten.py", line 2164, in main    temp_files=temp_files, DEBUG=DEBUG)  File "/Applications/Unity/Hub/Editor/2020.1.4f1/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/emscripten.py", line 81, in emscript    backend_output = compile_js(infile, temp_files, DEBUG)  File "/Applications/Unity/Hub/Editor/2020.1.4f1/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/emscripten.py", line 110, in compile_js    jsrun.timeout_run(subprocess.Popen(backend_args, stdout=subprocess.PIPE, universal_newlines=True), note_args=backend_args)  File "/Applications/Unity/Hub/Editor/2020.1.4f1/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/tools/jsrun.py", line 20, in timeout_run    raise Exception('Subprocess "' + ' '.join(note_args) + '" failed with exit code ' + str(proc.returncode) + '!')Exception: Subprocess "/Applications/Unity/Hub/Editor/2020.1.4f1/PlaybackEngines/WebGLSupport/BuildTools/Emscripten_FastComp_Mac/llc /tmp/tmpssGiJB/build.bc -march=js -filetype=asm -o /tmp/tmp0qijqH.4.js -emscripten-stack-size=5242880 -O3 -emscripten-precise-f32 -emscripten-assertions=1 -emscripten-global-base=1024 -emscripten-no-exit-runtime -emscripten-wasm -emscripten-only-wasm" failed with exit code 1!
5. UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&) (at /Users/builduser/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:189)
6.  

Code (CSharp):

1. Exception: Failed building WebGL Player.
2. UnityEditor.WebGL.ProgramUtils.StartProgramChecked (System.Diagnostics.ProcessStartInfo p) (at /Users/bokken/buildslave/unity/build/PlatformDependent/WebGL/Extensions/Unity.WebGL.extensions/ProgramUtils.cs:48)
3. UnityEditor.WebGL.WebGlBuildPostprocessor.EmscriptenLink (UnityEditor.Modules.BuildPostProcessArgs args, System.Boolean wasmBuild, System.String sourceFiles, System.String sourceFilesHash) (at /Users/bokken/buildslave/unity/build/PlatformDependent/WebGL/Extensions/Unity.WebGL.extensions/BuildPostprocessor.cs:431)
4. UnityEditor.WebGL.WebGlBuildPostprocessor.LinkBuild (UnityEditor.Modules.BuildPostProcessArgs args) (at /Users/bokken/buildslave/unity/build/PlatformDependent/WebGL/Extensions/Unity.WebGL.extensions/BuildPostprocessor.cs:473)
5. UnityEditor.WebGL.WebGlBuildPostprocessor.PostProcess (UnityEditor.Modules.BuildPostProcessArgs args) (at /Users/bokken/buildslave/unity/build/PlatformDependent/WebGL/Extensions/Unity.WebGL.extensions/BuildPostprocessor.cs:912)
6. UnityEditor.Modules.DefaultBuildPostprocessor.PostProcess (UnityEditor.Modules.BuildPostProcessArgs args, UnityEditor.BuildProperties& outProperties) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Modules/DefaultBuildPostprocessor.cs:27)
7. UnityEditor.PostprocessBuildPlayer.Postprocess (UnityEditor.BuildTargetGroup targetGroup, UnityEditor.BuildTarget target, System.String installPath, System.String companyName, System.String productName, System.Int32 width, System.Int32 height, UnityEditor.BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.Build.Reporting.BuildReport report) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/PostprocessBuildPlayer.cs:324)
8. UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&) (at /Users/builduser/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:189)
9.  

Ummm ... help?

 

Narrowed this down to having 'deep profiling support' enabled ... doesn't happen with a fresh unity project so, something to do with my specific project setup. Logged bug as case #1274819

 

Same problem here and deep profiling is not enabled. I was not building my project as development mode. Any progress on this bug?