Support Ubuntu 14.10 / gcc 4.9.1

Development Platform & Builds
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1

Howdy. I’m not familiar with Unreal’s build tool or how it works, but it seems it isn’t compatible with the latest Ubuntu. Two issues:

To start, (this may not an issue with UE4) CMake won’t recognize ATI’s fglrx drivers and can’t find libGL.so in the filesystem. This causes GenerateProjectFiles.sh to crash silently(!). I fixed this by manually linking /usr/lib/libGL.so to /usr/lib/fglrx/libGL.so.1

Second, following this exactly, make ShaderCompileWorker UnrealLightmass UE4Editor won’t work either, lots of

cc1plus: error: unrecognized command line option "-Wno-ignored-attributes" [-Werror]

cc1plus: error: unrecognized command line option "-Wno-logical-op-parentheses" [-Werror]

The tool starts with
$ make ShaderCompileWorker UnrealLightmass UE4Editor

Engine/Build/BatchFiles/Linux/Build.sh ShaderCompileWorker Linux Development

Building ShaderCompileWorker......

Using gcc version '4.9.1' (string), 4 (major), 9 (minor), 1 (patch)

I have that gcc and clang 3.5 installed.

2

It should not be using gcc but clang for compiling through UBT.

You have to determine if there’s something causing this, perhaps a configuration change between 14.04 and 14.10. LinuxToolChain detects clang on the system and uses it, so if that’s not working it would probably fall back to gcc.

3

Thanks, somehow clang got uninstalled between the time I ran the project files installer script and got to the makefile stage – probably happened when I pasted the whole dependancy list from the linux build wiki into apt-get install. Oops!