added default Linux UE toolchain directory (#558)

Instead of forcing user to specify a suitable directory for the UE toolchain, we offer a default which matches what the Github runners use and which is also covered by the root `.gitignore` file

1 files changed, 13 insertions, 7 deletions

diff --git a/scripts/ue_build_linux/ue_build.sh b/scripts/ue_build_linux/ue_build.sh
index 4613dd5ec..690f9f661 100755
--- a/scripts/ue_build_linux/ue_build.sh
+++ b/scripts/ue_build_linux/ue_build.sh
@@ -1,22 +1,28 @@
 #!/bin/bash
 
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+ZEN_ROOT=$(realpath $SCRIPT_DIR/../..)
+
 die() { echo ERROR: $1; exit 1; }
 
-# Validate input
-if [ -z $1 ]; then
-	echo "usage: $0 <ue_toolchain_dir>"
-	exit 1
+if [[ $1 == "--help" ]]; then
+	echo "usage: $0 <ue_toolchain_dir> (defaults to ${ZEN_ROOT}/.tmp-ue-toolchain)"
+	exit
 fi
 
-if ! [ -d $1 ]; then
+toolchain_dir="${1:-${ZEN_ROOT}/.tmp-ue-toolchain}"
+
+# Validate input
+
+if ! [ -d $toolchain_dir ]; then
 	die "$1 is not a directory"
 fi
 
-if ! [ -e $1/bin/clang++ ]; then
+if ! [ -e $toolchain_dir/bin/clang++ ]; then
 	die "$1/bin/clang++ does not exist"
 fi
 
-export UE_TOOLCHAIN_DIR=$(realpath $1)
+export UE_TOOLCHAIN_DIR=$(realpath $toolchain_dir)
 export CC="clang"
 export CXX="clang++"
 export LD="clang++"