How to use system Clang instead of the bundled version

Development Platform & Builds
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This might give you a hint:

https://github.com/EpicGames/UnrealEngine/blob/8e4560b8c22b309e73ff0ce90377742c3dfe13cc/Engine/Source/Programs/UnrealBuildTool/Platform/Linux/LinuxCommon.cs

UBT checks all possible clang shell commands and use first found on the list… so i guess simple solution is simply deleting clang in UE4 or simple don’t path it in evrnament varables. “clang” will always be picked first so that one will be used with top proprity.

You can always modify UBT code if you like.