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# Build Zen with the UE Linux toolchain
This folder contains scripts to build Zen using the UE Linux toolchain. 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 struicture 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 source 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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