Use the build scripts from https://github.com/japaric/trust.

.travis.yml

@@ -1,18 +1,65 @@
+# Based on the "trust" template v0.1.2
+# https://github.com/japaric/trust/tree/v0.1.2
+
+dist: trusty
 language: rust
+services: docker
+sudo: required
 rust: nightly-2018-04-19
 cache: cargo
-before_install:
-  - rustup component add rustfmt-preview
-  # - cargo install clippy -f --vers=0.0.195
+
 env:
   global:
+    - CRATE_NAME=poa-ballot-stats
     - RUST_BACKTRACE=1
     - RUSTFLAGS="-D warnings"
-  script:
-    - cargo fmt -- --write-mode=diff
-    # TODO: Enable Clippy once https://github.com/rust-lang/rust/issues/49643
-    #       has been resolved. Add tests.
-    # - cargo clippy -- -D clippy
-    # - cargo clippy --tests -- -D clippy
-    # - cargo check --tests
-    - cargo test
+
+matrix:
+  include:
+    - env: TARGET=x86_64-unknown-linux-gnu
+    - env: TARGET=x86_64-apple-darwin
+      os: osx
+
+before_install:
+  - set -e
+  - rustup self update
+  - rustup component add rustfmt-preview
+  # - cargo install clippy -f --vers=0.0.195
+
+install:
+  - sh ci/install.sh
+  - source ~/.cargo/env || true
+
+script:
+  - bash ci/script.sh
+
+after_script: set +e
+
+before_deploy:
+  - sh ci/before_deploy.sh
+
+deploy:
+  api_key:
+    secure: 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
+  file_glob: true
+  file: $CRATE_NAME-$TRAVIS_TAG-$TARGET.*
+  on:
+    condition: $TRAVIS_RUST_VERSION = nightly-2018-04-19
+    tags: true
+  provider: releases
+  skip_cleanup: true
+
+cache: cargo
+before_cache:
+  # Travis can't cache files that are not readable by "others"
+  - chmod -R a+r $HOME/.cargo
+
+branches:
+  only:
+    # release tags
+    - /^v\d+\.\d+\.\d+.*$/
+    - master
+
+notifications:
+  email:
+    on_success: never

ci/before_deploy.sh

@@ -0,0 +1,32 @@
+# This script takes care of building your crate and packaging it for release
+
+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 poa-ballot-stats --target $TARGET --release -- -C lto
+
+    cp target/$TARGET/release/poa-ballot-stats $stage/
+    cp -r contracts $stage/
+
+    cd $stage
+    tar czf $src/$CRATE_NAME-$TRAVIS_TAG-$TARGET.tar.gz *
+    cd $src
+
+    rm -rf $stage
+}
+
+main

ci/install.sh

@@ -0,0 +1,27 @@
+set -ex
+
+main() {
+    local target=
+    if [ $TRAVIS_OS_NAME = linux ]; then
+        target=x86_64-unknown-linux-musl
+        sort=sort
+    else
+        target=x86_64-apple-darwin
+        sort=gsort  # for `sort --sort-version`, from brew's coreutils.
+    fi
+
+    # This fetches latest stable release
+    local tag=$(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
+}
+
+main

ci/script.sh

@@ -0,0 +1,22 @@
+set -ex
+
+main() {
+    cargo fmt -- --write-mode=diff
+
+    cross build --target $TARGET
+    cross build --target $TARGET --release
+
+    if [ ! -z $DISABLE_TESTS ]; then
+        return
+    fi
+
+    cross test --target $TARGET
+    cross test --target $TARGET --release
+
+    cross build --target $TARGET --release
+}
+
+# we don't run the "test phase" when doing deploys
+if [ -z $TRAVIS_TAG ]; then
+    main
+fi