Add support of builds for Ubuntu 18/20 through Docker

build-with-docker.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+## build-with-docker.sh
+## @author gdm85
+##
+## Script to build c3c for either Ubuntu 18 or Ubuntu 20.
+##
+#
+
+if [ $# -ne 1 -a $# -ne 2 ]; then
+	echo "Usage: build-with-docker.sh (18|20) [Debug|Release]" 1>&2
+	exit 1
+fi
+
+set -e
+
+if [ -z "$2" ]; then
+	CMAKE_BUILD_TYPE=Debug
+else
+	CMAKE_BUILD_TYPE="$2"
+fi
+
+if [ "$1" = 18 ]; then
+	UBUNTU_VERSION="18.04"
+	DEPS="llvm-10-dev liblld-10-dev libclang-10-dev"
+elif [ "$1" = 20 ]; then
+	UBUNTU_VERSION="20.04"
+	DEPS="llvm-11-dev liblld-11-dev clang-11 libllvm11 llvm-11-runtime"
+else
+	echo "ERROR: expected 18 or 20 as Ubuntu version argument" 1>&2
+	exit 2
+fi
+
+cd docker && docker build -t c3c-builder --build-arg UID=$(id -u) --build-arg GID=$(id -g) \
+	--build-arg DEPS="$DEPS" --build-arg UBUNTU_VERSION="$UBUNTU_VERSION" .
+cd ..
+
+rm -rf build bin
+mkdir -p build bin
+
+exec docker run -ti --rm -v "$PWD":/home/c3c/source -w /home/c3c/source c3c-builder bash -c \
+	"cd build && cmake -DLLVM_DIR=/usr/lib/llvm-11/cmake -DCMAKE_BUILD_TYPE=$CMAKE_BUILD_TYPE .. && cmake --build . && mv c3c ../bin/"