AppImage build scripts, mk. 1

Produces working AppImage for bionic and newer distros.

scripts/linux/build-appimage-docker.sh

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+#! /bin/bash
+
+set -ex
+
+REPO_ROOT=$(readlink -f $(dirname "$0")/../..)
+
+docker run --rm -it -e NO_CLEANUP=1 -e CI=1 --device /dev/fuse:mrw -v $(readlink -f .):/ws openrct2/openrct2:ubuntu_amd64 bash -xc "
+cd /ws
+apt-get update
+apt-get install -y wget libfuse2
+bash -xe scripts/linux/build-appimage.sh
+"

scripts/linux/build-appimage.sh

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+#! /bin/bash
+
+set -e
+set -x
+
+# use RAM disk if possible
+if [ "$CI" == "" ] && [ -d /dev/shm ]; then
+    TEMP_BASE=/dev/shm
+else
+    TEMP_BASE=/tmp
+fi
+
+BUILD_DIR=$(mktemp -d -p "$TEMP_BASE" AppImageUpdate-build-XXXXXX)
+
+cleanup () {
+    if [ -d "$BUILD_DIR" ]; then
+        rm -rf "$BUILD_DIR"
+    fi
+}
+
+[ "$NO_CLEANUP" == "" ] && trap cleanup EXIT
+
+# store repo root as variable
+REPO_ROOT=$(readlink -f $(dirname "$0")/../..)
+OLD_CWD=$(readlink -f .)
+
+pushd "$BUILD_DIR"
+
+#pushd "$REPO_ROOT"
+#wget -c http://download.icu-project.org/files/icu4c/59.1/icu4c-59_1-src.tgz
+#echo "54923fa9fab5b2b83f235fb72523de37  icu4c-59_1-src.tgz" | md5sum -c
+#popd
+#
+#tar xf "$REPO_ROOT"/icu4c-59_1-src.tgz
+#
+#if which clang &>/dev/null; then
+#    export CC=clang
+#    if which clang++ &>/dev/null; then
+#        export CXX=clang++
+#    else
+#        export CXX=clang
+#    fi
+#fi
+#
+#if which ccache &>/dev/null; then
+#    export CC="ccache $CC" CXX="ccache $CXX"
+#fi
+#
+#
+#pushd icu/source
+#./runConfigureICU Linux --enable-static --enable-shared --prefix="$BUILD_DIR"/ext
+#unset CC CXX
+#make install -j$(nproc)
+#popd
+#
+#export PKG_CONFIG_PATH=$(readlink -f ext/lib/pkgconfig)
+#
+#cmake "$REPO_ROOT" -DCMAKE_PREFIX_PATH=$(readlink -f ext)
+
+#wget https://raw.githubusercontent.com/wheybags/glibc_version_header/master/version_headers/force_link_glibc_2.27.h
+
+#flags="-include "$(readlink -f "force_link_glibc_2.27.h")
+CC=clang CXX=clang++ CFLAGS="$flags" CXXFLAGS="$flags" cmake "$REPO_ROOT" -DCMAKE_INSTALL_PREFIX:PATH=/usr -DCMAKE_EXE_LINKER_FLAGS="-pthread"
+
+make -j$(nproc) VERBOSE=1
+make install DESTDIR=AppDir
+
+wget https://github.com/TheAssassin/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage
+chmod +x linuxdeploy*.AppImage
+./linuxdeploy*.AppImage --appimage-extract
+wget https://github.com/TheAssassin/linuxdeploy-plugin-checkrt/releases/download/continuous/linuxdeploy-plugin-checkrt-x86_64.sh
+chmod +x linuxdeploy-plugin-checkrt-*.sh
+mv linuxdeploy-plugin-checkrt-*.sh squashfs-root/usr/bin
+ARCH=x86_64 squashfs-root/AppRun --appdir AppDir/ --output appimage -l /lib/x86_64-linux-gnu/libz.so.1
+
+mv OpenRCT2*.AppImage "$OLD_CWD"/