Also added efornara's crossbuild - build containers - I'm planning to work them into the current build container stack, likely with lots of modifications. (https://github.com/efornara/crossbuild)

misc/build-containers-frt/.gitignore

@@ -0,0 +1,4 @@
+*.o
+*.bin
+build/
+.clang-format

misc/build-containers-frt/LICENSE

@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org/>

misc/build-containers-frt/README

@@ -0,0 +1,7 @@
+https://github.com/efornara/crossbuild - 0e6be47aa48d4f1dbd47410d64027b67ac091f38
+
+patreon: efornaralabs
+
+Docker files to cross-compile SDL2-based projects for single board computers.
+
+Very permissive license (http://unlicense.org/).

misc/build-containers-frt/docker/Dockerfile.arm32v7

@@ -0,0 +1,5 @@
+FROM crossbuild:base
+RUN dpkg --add-architecture armhf && apt-get update && apt-get install -y -q \
+ crossbuild-essential-armhf
+RUN apt-get install -y -q \
+ libstdc++-8-dev:armhf libsdl2-dev:armhf libgbm-dev:armhf libsamplerate0-dev:armhf

misc/build-containers-frt/docker/Dockerfile.arm64v8

@@ -0,0 +1,5 @@
+FROM crossbuild:base
+RUN dpkg --add-architecture arm64 && apt-get update && apt-get install -y -q \
+ crossbuild-essential-arm64
+RUN apt-get install -y -q \
+ libstdc++-8-dev:arm64 libsdl2-dev:arm64 libgbm-dev:arm64 libsamplerate0-dev:arm64

misc/build-containers-frt/docker/Dockerfile.base

@@ -0,0 +1,10 @@
+FROM debian:buster-backports
+ENV DEBIAN_FRONTEND noninteractive
+RUN apt-get update && apt-get upgrade -y && \
+apt-get install --no-install-recommends -y -q \
+ git-core vim-nox wget less nvi tmux lynx
+RUN apt-get install -y -q \
+ build-essential clang llvm lld python3-pip
+RUN apt-get install -y -q \
+ -t buster-backports cmake ninja-build
+RUN python3 -m pip install scons meson

misc/build-containers-frt/docker/Dockerfile.droid

@@ -0,0 +1,11 @@
+FROM debian:bullseye
+ENV DEBIAN_FRONTEND noninteractive
+RUN apt-get update && apt-get upgrade -y && \
+apt-get install --no-install-recommends -y -q \
+ git-core vim-nox wget less nvi tmux lynx
+RUN apt-get install -y -q \
+ scons cmake ninja-build
+RUN apt-get install -y -q \
+ unzip curl openjdk-11-jdk-headless
+RUN apt-get install -y -q \
+ python3-protobuf

misc/build-containers-frt/docker/Dockerfile.x86_64

@@ -0,0 +1,3 @@
+FROM crossbuild:base
+RUN apt-get install -y -q \
+ libstdc++-8-dev libsdl2-dev libgbm-dev libsamplerate0-dev

misc/build-containers-frt/docker/build.sh

@@ -0,0 +1,6 @@
+#! /bin/sh
+set -e
+
+[ -f Dockerfile.$1 ]
+
+exec docker build -t crossbuild:$1 -f Dockerfile.$1 .

misc/build-containers-frt/docker/docker.sh

@@ -0,0 +1,15 @@
+#! /bin/sh
+set -e
+
+if [ $# -ne 1 ] ; then
+	echo 'usage: docker.sh arch'
+	exit 1
+fi
+
+exec docker run -it --rm \
+  -v /etc/passwd:/etc/passwd:ro \
+  -v /etc/shadow:/etc/shadow:ro \
+  -v /etc/group:/etc/group:ro \
+  -v /opt:/opt \
+  -v $HOME:$HOME \
+crossbuild:$1

misc/build-containers-frt/scripts/build_sdl2

@@ -0,0 +1,31 @@
+#! /bin/sh
+set -e
+
+script=$(readlink -f "$0")
+script_path=$(dirname "$script")
+. $script_path/detect
+
+if [ -z "$SDL2_SRC" ] ; then
+	echo "SDL2_SRC not set"
+	exit 1
+fi
+toplevel=`git rev-parse --show-toplevel`
+obj="$toplevel/build/obj/$tag-sdl2"
+
+mkdir -p $obj
+cd $obj
+
+if [ ! -f $obj/Makefile -o "x$1" = "xconfig" ] ; then
+	export CFLAGS="$archflags"
+	export CXXFLAGS="$archflags"
+	"$SDL2_SRC/configure" \
+	 --prefix="$toplevel/build/bin/$tag-sdl2" \
+	 --host=$host \
+	 --disable-render \
+	 --enable-video-kmsdrm \
+	 --disable-video-vulkan \
+	#
+fi
+
+nice make -j 2
+make install

misc/build-containers-frt/scripts/detect

@@ -0,0 +1,48 @@
+# Detect Build Environment
+
+#
+# Example of platform override:
+#
+#    platform=arm8 ./build_hello
+#
+
+if [ -z "$platform" ] ; then
+	if [ -x /usr/bin/arm-linux-gnueabihf-gcc ] ; then
+		if [ -x /usr/bin/x86_64-linux-gnu-gcc ] ; then
+			platform=arm7
+		else
+			# if not cross-compiling on x86_64, assume raspbian
+			platform=arm6
+		fi
+	elif [ -x /usr/bin/aarch64-linux-gnu-gcc ] ; then
+		platform=arm8
+	else
+		platform=pc
+	fi
+fi
+
+if [ "$platform" = arm6 ] ; then
+	host=arm-linux-gnueabihf
+	tag=linux-arm32v6
+	archflags="-march=armv6 -mfpu=vfp -mfloat-abi=hard"
+elif [ "$platform" = arm7 ] ; then
+	host=arm-linux-gnueabihf
+	tag=linux-arm32v7
+	archflags="-march=armv7-a -mfpu=neon-vfpv4 -mfloat-abi=hard"
+elif [ "$platform" = arm8 ] ; then
+	host=aarch64-linux-gnu
+	tag=linux-arm64v8
+	archflags="-march=armv8-a"
+elif [ "$platform" = pc ] ; then
+	host=x86_64-linux-gnu
+	tag=linux-x86_64
+	archflags=""
+else
+	echo "detect: unknown platform: '$platform'"
+	exit 1
+fi
+
+echo "detect:"
+echo "  host: $host"
+echo "  tag: $tag"
+echo "  archflags: $archflags"

misc/build-containers-frt/toolchains/linux-arm32v6-gcc.cmake

@@ -0,0 +1,10 @@
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR ARM)
+
+set(archOpts "-march=armv6 -mfpu=vfp -mfloat-abi=hard")
+set(ccOpts "")
+set(CMAKE_C_COMPILER arm-linux-gnueabihf-gcc)
+set(CMAKE_CXX_COMPILER arm-linux-gnueabihf-g++)
+set(CMAKE_C_FLAGS "${archOpts} ${ccOpts}")
+set(CMAKE_CXX_FLAGS "${archOpts} ${ccOpts}")
+

misc/build-containers-frt/toolchains/linux-arm32v7-clang.cmake

@@ -0,0 +1,10 @@
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR ARM)
+
+set(archOpts "-march=armv7-a -mfpu=neon-vfpv4 -mfloat-abi=hard")
+set(ccOpts "-target arm-linux-gnueabihf")
+set(CMAKE_C_COMPILER clang)
+set(CMAKE_CXX_COMPILER clang++)
+set(CMAKE_C_FLAGS "${archOpts} ${ccOpts}")
+set(CMAKE_CXX_FLAGS "${archOpts} ${ccOpts}")
+

misc/build-containers-frt/toolchains/linux-arm32v7-gcc.cmake

@@ -0,0 +1,10 @@
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR ARM)
+
+set(archOpts "-march=armv7-a -mfpu=neon-vfpv4 -mfloat-abi=hard")
+set(ccOpts "")
+set(CMAKE_C_COMPILER arm-linux-gnueabihf-gcc)
+set(CMAKE_CXX_COMPILER arm-linux-gnueabihf-g++)
+set(CMAKE_C_FLAGS "${archOpts} ${ccOpts}")
+set(CMAKE_CXX_FLAGS "${archOpts} ${ccOpts}")
+

misc/build-containers-frt/toolchains/linux-arm64v8-clang.cmake

@@ -0,0 +1,10 @@
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR ARM)
+
+set(archOpts "-march=armv8-a")
+set(ccOpts "-target aarch64-linux-gnu")
+set(CMAKE_C_COMPILER clang)
+set(CMAKE_CXX_COMPILER clang++)
+set(CMAKE_C_FLAGS "${archOpts} ${ccOpts}")
+set(CMAKE_CXX_FLAGS "${archOpts} ${ccOpts}")
+

misc/build-containers-frt/toolchains/linux-arm64v8-gcc.cmake

@@ -0,0 +1,9 @@
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR ARM)
+
+set(archOpts "-march=armv8-a")
+set(ccOpts "")
+set(CMAKE_C_COMPILER aarch64-linux-gnu-gcc)
+set(CMAKE_CXX_COMPILER aarch64-linux-gnu-g++)
+set(CMAKE_C_FLAGS "${archOpts} ${ccOpts}")
+set(CMAKE_CXX_FLAGS "${archOpts} ${ccOpts}")