mrubyのLinux/macOS向けクロスビルドのためのDockerfile(素のmrubyをビルドするだけならcurlとlibssl-devはたぶんいらない)

Dockerfile

FROM debian:buster

ENV OSX_CROSS_PATH=/osxcross
COPY --from=dockercore/golang-cross:1.13.10 "${OSX_CROSS_PATH}/." "${OSX_CROSS_PATH}/"

ARG DEBIAN_FRONTEND=noninteractive
RUN apt-get update -qq && apt-get install -y -q --no-install-recommends \
    bison \
    clang \
    curl \
    git \
    libc6-dev \
    libssl-dev \
    make \
    musl-tools \
    ruby-dev \
 && rm -rf /var/lib/apt/lists/*

ENV PATH=${OSX_CROSS_PATH}/target/bin:$PATH

sample_build_config.rb

def build_conf(conf)
  conf.gembox 'default'
end

MRuby::Build.new do |conf|
  toolchain :gcc

  build_conf(conf)
  conf.enable_test
  conf.enable_debug if ENV['ENABLE_DEBUG']
end

MRuby::Build.new('linux-x86_64') do |conf|
  toolchain :gcc

  [conf.cc, conf.linker].each do |cc|
    cc.command = 'musl-gcc'
    cc.flags += %w[-static -Os]
  end

  build_conf(conf)
end

MRuby::CrossBuild.new('darwin-x86_64') do |conf|
  toolchain :clang

  [conf.cc, conf.linker].each do |cc|
    cc.command = 'x86_64-apple-darwin14-clang'
  end
  conf.cxx.command      = 'x86_64-apple-darwin14-clang++'
  conf.archiver.command = 'x86_64-apple-darwin14-ar'

  # To configure: k0kubun/mruby-onig-regexp etc.
  conf.build_target     = 'x86_64-pc-linux-gnu'
  conf.host_target      = 'x86_64-apple-darwin14'

  build_conf(conf)
end

sample_usage.sh

docker build -t mruby-cross .

# copy Rakefile from https://gist.github.com/arika/38daeec40b67d8e9042e5234b4720927
# copy sample_build_config.rb to build_config.rb

mkdir vendor
cd $_
curl -fsSL https://github.com/mruby/mruby/archive/2.1.0.tar.gz | tar xf -
mv mruby-2.1.0 mruby
cd -

docker run -v $(pwd):/work -w /work mruby-cross rake

$ file vendor/mruby/build/*/bin/mruby
vendor/mruby/build/darwin-x86_64/bin/mruby: Mach-O 64-bit executable x86_64
vendor/mruby/build/host/bin/mruby:          ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 3.2.0, BuildID[sha1]=154b8cd45cdb7abefd6357d74aa116aa451e68ab, with debug_info, not stripped
vendor/mruby/build/linux-x86_64/bin/mruby:  ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, with debug_info, not stripped