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LLVM ERROR: Signed comparisons not yet supported for integer types larger than 64 bits

Hi everyone,

I am trying to build Unreal Engine for OS X Yosemite 10.10. I’ve encountered several problems but I’ve been always able to fix them.
But I seem really stuck on this one. For some reason when trying to build UE4Game for HTML5 it throws out following LLVM ERROR:


MBP:UnrealEngine DtecIndustries$ ./Engine/Build/BatchFiles/Mac/Build.sh UE4Game HTML5 Development
Setting up Mono
Building UBT...
	 0 Error(s)
Building UE4Game...
2015-07-24 13:05:59.689 defaults[16470:374545] 
The domain/default pair of (/Users/DtecIndustries/Library/Preferences/com.apple.dt.Xcode, IDEBuildOperationMaxNumberOfConcurrentCompileTasks) does not exist
Running command : Engine/Binaries/DotNET/UnrealBuildTool.exe UE4Game HTML5 Development 
Performing 1 actions (2 in parallel)
[1/1] python UE4Game.js
INFO     root: (Emscripten: Running sanity checks)
WARNING  root: building system library: libcxx_noexcept.bc...
WARNING  root:                                               ok
WARNING  root: building system library: libcxxabi.bc...
WARNING  root:                                         ok
WARNING  root: building system library: gl.bc...
WARNING  root:                                  ok
WARNING  root: building system library: libc.bc...
WARNING  root:                                    ok
WARNING  root: building system library: dlmalloc.bc...
WARNING  root:                                        ok
Unsupported:   %326 = icmp slt i136 %319, 0
LLVM ERROR: Signed comparisons not yet supported for integer types larger than 64 bits
Traceback (most recent call last):
  File "/Applications/emsdk/emsdk_portable/emscripten/tag-1.34.3/emcc", line 1270, in <module>
    shared.Building.llvm_opt(final, fastcomp_opts, final + '.adsimp.bc')
  File "/Applications/emsdk/emsdk_portable/emscripten/tag-1.34.3/tools/shared.py", line 1430, in llvm_opt
    assert os.path.exists(target), 'Failed to run llvm optimizations: ' + output
AssertionError: Failed to run llvm optimizations: 
-------- End Detailed Actions Stats -----------------------------------------------------------
ERROR: UBT ERROR: Failed to produce item: /Users/DtecIndustries/Documents/UnrealEngine/UnrealEngine/Engine/Binaries/HTML5/UE4Game.js
Total build time: 375.05 seconds
MBP:UnrealEngine DtecIndustries$ ./Engine/Build/BatchFiles/Mac/Build.sh UE4Game HTML5 Development
Setting up Mono


What would be causing this? I’m assuming a failure with emscripten or could it also be something else? I am running emscripten 1.34.3.
Feel free to ask additional information or logs. I would be eternally thankfully for even the smallest point in the right direction! :smiley:

Thanks in advance, Dtec