Add option to build inside docker container

This allows us to target older versions of GLIBC.

addons/godot_xterm/native/.dockerignore

@@ -0,0 +1 @@
+*

addons/godot_xterm/native/Dockerfile

@@ -0,0 +1,4 @@
+FROM kroggen/ubuntu-16.04-gcc
+RUN apt-get update -y
+RUN apt-get install -y python3 python3-pip gcc-multilib g++-multilib
+RUN pip3 install scons

addons/godot_xterm/native/SConstruct

@@ -277,7 +277,7 @@ else:
     else:
         #sources.append('src/node_pty/win/conpty.cc')
         env.Append(LIBS=[
-            env.File(f'thirdparty/libuv/build/{env["target"].capitalize()}/uv_a.lib'),
+            env.File('thirdparty/libuv/build/{}/uv_a.lib'.format(env["target"].capitalize())),
             'Advapi32.lib',
             'Iphlpapi.lib',
             'user32.lib',

addons/godot_xterm/native/build.sh

@@ -11,26 +11,43 @@ while [[ $# -gt 0 ]]; do
       shift
       shift
       ;;
+    -b|--bits)
+      bits="$2"
+      shift
+      shift
+      ;;
     --disable-pty)
       disable_pty="yes"
       shift
       ;;
+    --docker)
+      docker="yes"
+      shift
+      ;;
     *)
-      echo "Usage: ./build.sh [-t|--target <release|debug>] [--disable_pty]";
+      echo "Usage: ./build.sh [-t|--target <release|debug>] [-b|--bits <32|64>] [--disable_pty] [--docker]";
       exit 128
       shift
       ;;
   esac
 done
+
 # Set defaults.
 target=${target:-debug}
+bits=${bits:-64}
 disable_pty=${disable_pty:-no}
 nproc=$(nproc || sysctl -n hw.ncpu)
 
-
-#GODOT_DIR Get the absolute path to the directory this script is in.
+# Get the absolute path to the directory this script is in.
 NATIVE_DIR="$( cd "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
 
+if [ -n "$docker" ]; then
+	# Run build script inside docker container.
+	cd ${NATIVE_DIR}
+	UID_GID="0:0" TARGET=$target BITS=$bits docker-compose build linux
+	UID_GID="$(id -u):$(id -g)" TARGET=$target BITS=$bits docker-compose run linux
+	exit 0
+fi
 
 # Run script inside a nix shell if it is available.
 if command -v nix-shell && [ $NIX_PATH ] && [ -z $IN_NIX_SHELL ]; then
@@ -39,7 +56,6 @@ if command -v nix-shell && [ $NIX_PATH ] && [ -z $IN_NIX_SHELL ]; then
 	exit
 fi
 
-
 # Update git submodules.
 updateSubmodules() {
 	eval $1=$2 # E.g LIBUV_DIR=${NATIVE_DIR}/thirdparty/libuv
@@ -54,15 +70,14 @@ updateSubmodules LIBUV_DIR ${NATIVE_DIR}/thirdparty/libuv
 updateSubmodules LIBTSM_DIR ${NATIVE_DIR}/thirdparty/libtsm 
 updateSubmodules GODOT_CPP_DIR ${NATIVE_DIR}/thirdparty/godot-cpp
 
-
 # Build godot-cpp bindings.
 cd ${GODOT_CPP_DIR}
 echo "scons generate_bindings=yes target=$target -j$nproc"
-scons generate_bindings=yes target=$target -j$nproc
+scons generate_bindings=yes target=$target bits=$bits -j$nproc
 
 # Build libuv as a static library.
 cd ${LIBUV_DIR}
-mkdir build || true
+mkdir -p build
 cd build
 args="-DCMAKE_BUILD_TYPE=$target -DBUILD_SHARED_LIBS=OFF -DCMAKE_POSITION_INDEPENDENT_CODE=TRUE"
 if [ "$target" == "release" ]; then
@@ -70,13 +85,14 @@ if [ "$target" == "release" ]; then
 else
 	args="$args -DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreadedDebugDLL"
 fi
+if [[ "$bits" -eq 32 ]]; then args="$args -DCMAKE_SYSTEM_PROCESSOR=i686 -DCMAKE_C_FLAGS=-m32"; fi
 cmake .. $args
 cd ..
-cmake --build build --config $target -j$nproc
+cmake --build build --config $target
 
 # Build libgodot-xterm.
 cd ${NATIVE_DIR}
-scons target=$target disable_pty=$disable_pty -j$nproc
+scons target=$target bits=$bits disable_pty=$disable_pty -j$nproc
 
 # Use Docker to build libgodot-xterm javascript.
 if [ -x "$(command -v docker-compose)" ]; then

addons/godot_xterm/native/docker-compose.yaml

@@ -12,3 +12,14 @@ services:
         scons platform=javascript target=$${TARGET:-debug} -j$$(nproc)
         cd /src
         scons platform=javascript target=$${TARGET:-debug} -j$$(nproc)
+  linux:
+    build: .
+    user: ${UID_GID}
+    volumes:
+      - .:/src
+    command:
+      - /bin/bash
+      - -c
+      - |
+        cd /src
+        /bin/bash ./build.sh --target ${TARGET} --bits ${BITS}