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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.
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