Merge pull request #219 from EpicGames/linux-build

Scripts for building Linux binaries using UE's Linux toolchain.

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+# Build Zen with the UE Linux toolchain

+

+This folder contains scripts to build Zen using the UE Linux toolchain. This

+can be used to output binaries that meet the VFX Reference Platform versions.

+It works by using the --sysroot= option to redirect compilers and linkers to

+find headers and libraries. There are a few components involved;

+

+1) get_ue_toolchain.sh <toolchain_dir>

+

+This will download the required components from Perforce and structure them in

+such a way that they can be used by both vcpkg and xmake when building Zen.

+

+2) ue_build.sh <toolchain_dir> <prog> [args...] 

+

+Given the toolchain location downloaded in step (1), this script sets up a

+suitable environment and execs the "prog [args...]". It is expected that this

+is used to invoke xmake to build Zen;

+

+```

+$ scripts/ue_linux_build/ue_build.sh ~/uetools xmake config --mode=debug --vcpkg=~/vcpkg

+$ scripts/ue_linux_build/ue_build.sh ~/uetools xmake build

+```

+

+It is possible that `--toolchain=clang` may be required as a configuration

+option. The ue_build.sh script can also be sourced into the current shell,

+although it is worth noting that this has never been tried.

+

+3) clang / clang++

+

+These acts as shims to the binaries in `toolchain_dir`, adding in the required

+command line arguments to use the correct headers and libraries. The ue_build.sh

+script adjusts $PATH appropriately.