init cross compilation setup

.travis.yml

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+dist: trusty
+language: rust
+services: docker
+sudo: required
+
+env:
+  global:
+    - CRATE_NAME=bpb
+    - RUST_BACKTRACE=1
+
+matrix:
+  include:
+    - env: TARGET=armv7-unknown-linux-gnueabihf
+      rust: nightly
+    - env: TARGET=x86_64-unknown-linux-musl
+      rust: nightly
+    - env: TARGET=x86_64-apple-darwin
+      rust: nightly
+      os: osx
+    - env: TARGET=x86_64-unknown-freebsd DISABLE_TESTS=1
+      rust: nightly
+
+before_install:
+  - set -e
+
+install:
+  - sh scripts/install.sh
+  - source ~/.cargo/env || true
+
+script:
+  - bash scripts/script.sh
+
+after_script: set +e
+
+before_deploy:
+  - sh scripts/before_deploy.sh
+
+deploy:
+  provider: releases
+  skip_cleanup: true
+  file_glob: true
+  file: $CRATE_NAME-$TRAVIS_TAG-$TARGET.*
+  api_key:
+    secure: "{{TOKEN}}"
+  on:
+    tags: true
+
+cache: cargo
+before_cache:
+  - chmod -R a+r $HOME/.cargo
+
+notifications:
+  email:
+    on_success: never
+    on_failure: never

scripts/before_deploy.ps1

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+# This script takes care of packaging the build artifacts that will go in the
+# release zipfile.
+
+$PKG_NAME = "bpb"
+$SRC_DIR = $PWD.Path
+$STAGE = [System.Guid]::NewGuid().ToString()
+
+Set-Location $ENV:Temp
+New-Item -Type Directory -Name $STAGE
+Set-Location $STAGE
+
+$ZIP = "$SRC_DIR\$($Env:CRATE_NAME)-$($Env:APPVEYOR_REPO_TAG_NAME)-$($Env:TARGET).zip"
+
+Copy-Item "$SRC_DIR\target\$($Env:TARGET)\release\$PKG_NAME.exe" '.\'
+
+7z a "$ZIP" *
+
+Push-AppveyorArtifact "$ZIP"
+
+Remove-Item *.* -Force
+Set-Location ..
+Remove-Item $STAGE
+Set-Location $SRC_DIR

scripts/before_deploy.sh

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+# This script takes care of building the crate and packaging it for release.
+
+PKG_NAME="bpb"
+
+set -ex
+
+main() {
+  local src=$(pwd) \
+    stage=
+
+  case $TRAVIS_OS_NAME in
+    linux)
+      stage=$(mktemp -d)
+      ;;
+    osx)
+      stage=$(mktemp -d -t tmp)
+      ;;
+  esac
+
+  test -f Cargo.lock || cargo generate-lockfile
+
+  cross rustc --bin $PKG_NAME --target $TARGET --release -- -C lto
+  cp target/$TARGET/release/$PKG_NAME $stage/
+
+  cd $stage
+  tar czf $src/$CRATE_NAME-$TRAVIS_TAG-$TARGET.tar.gz *
+  cd $src
+
+  rm -rf $stage
+}
+
+main

scripts/install.sh

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+set -ex
+
+main() {
+  local target=
+  if [ $TRAVIS_OS_NAME = linux ]; then
+    target=x86_64-unknown-linux-musl
+    sort=sort
+  else
+    target=x86_64-apple-darwin
+    sort=gsort  # for `sort --sort-version`, from brew's coreutils.
+  fi
+
+  # Builds for iOS are done on OSX, but require the specific target to be
+  # installed.
+  case $TARGET in
+    aarch64-apple-ios)
+      rustup target install aarch64-apple-ios
+      ;;
+    armv7-apple-ios)
+      rustup target install armv7-apple-ios
+      ;;
+    armv7s-apple-ios)
+      rustup target install armv7s-apple-ios
+      ;;
+    i386-apple-ios)
+      rustup target install i386-apple-ios
+      ;;
+    x86_64-apple-ios)
+      rustup target install x86_64-apple-ios
+      ;;
+  esac
+
+  # This fetches latest stable release
+  local tag=$(git ls-remote --tags --refs --exit-code https://github.com/japaric/cross \
+    | cut -d/ -f3 \
+    | grep -E '^v[0.1.0-9.]+$' \
+    | $sort --version-sort \
+    | tail -n1)
+  curl -LSfs https://japaric.github.io/trust/install.sh | \
+    sh -s -- \
+    --force \
+    --git japaric/cross \
+    --tag $tag \
+    --target $target
+
+  # Install test dependencies
+  rustup component add rustfmt-preview
+  rustup component add clippy-preview
+}
+
+main

scripts/script.sh

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+# This script takes care of testing the crate.
+
+set -ex
+
+main() {
+  cross build --target $TARGET
+  cross build --target $TARGET --release
+
+  if [ ! -z $DISABLE_TESTS ]; then
+      return
+  fi
+
+  cargo fmt -- --check
+  cargo +nightly clippy
+
+  cross test --target $TARGET
+  cross test --target $TARGET --release
+}
+
+# we don't run the "test phase" when doing deploys
+if [ -z $TRAVIS_TAG ]; then
+  main
+fi