Building unreal with clang 3.9.0

Development Platform & Builds
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1

I am on Ubuntu 14.04 LTS. I just pulled the UnrealEngine source code and I am on the release branch. Typing

./GenerateProjectFiles.sh

yields

UnrealBuildTool Exception: ERROR: This version of the Unreal Engine can only be compiled with clang 3.7, 3.6 and 3.5. clang 3.9.0 may not build it - please use a different version.

Is it possible to change somewhere in the code so I can try building Unreal with clang 3.9? I am using clang 3.9 for my other projects so downgrading it is not an option for me.

2

You can edit LinuxToolChain.cs and whitelist your version of clang (or remove the check altogether) in LinuxToolChain constructor.

3

Thanks a lot for the pointer, now it passes the check but unfortunately there is compilation errors when compiled with clang 3.9.0. Hopefully this will get updated sometimes soon!

4

Unfortunately, clang 3.9.0 is not supported for 4.12, so I don’t think the release will be updated.

5

Arch just upgrade to Clang 3.9. Is Clang 3.9 still unsupported?

6

Im running Arch and I’m getting this same problem from the AUR package… So yeah

7

According to UE4.15’s script (https://github.com/EpicGames/UnrealEngine/blob/4.15.0-release/Engine/Source/Programs/UnrealBuildTool/Linux/LinuxToolChain.cs#L23), Clang 3.9 should be fine. But you may have an issue with third parties, see https://github.com/EpicGames/UnrealEngine/pull/2788

8

I am using UnReal Engine 4 version 4.15.1

I have been using openSuSE Tumbleweed… My clang must have recently been upgraded to version 4.0.0

To rid myself of the message about the wrong version of the clang compiler I changed the line
string[] ClangNames = { “clang++”, “clang+±3.9”, “clang+±3.8”, “clang+±3.7”, “clang+±3.6”, “clang+±3.5” };

to
string[] ClangNames = { “clang++”, “clang+±4.0”, “clang+±3.9”, “clang+±3.8”, “clang+±3.7”, “clang+±3.6”, “clang+±3.5” };

and even more importantly the line of code reading
else if ((CompilerVersionMajor * 10 + CompilerVersionMinor) > 39 || (CompilerVersionMajor * 10 + CompilerVersionMinor) < 35)

to
else if ((CompilerVersionMajor * 10 + CompilerVersionMinor) > 40 || (CompilerVersionMajor * 10 + CompilerVersionMinor) < 35)

I know it is a hack… but the hack does not seem to be causing any issues ; everything is working properly … however when I fired off the editor a lot of stuff seem to be automatically be rebuilding with the prefix "Fixing "