Add multiple build targets to verify compilation across architectures (…

…#61)

* Add multiple build targets

* Move shell script logic to separate file and out of travis.yml

.travis.yml

@@ -12,9 +12,49 @@ branches:
     - master
 before_script:
   - rustup component add rustfmt-preview
+  - cross --version || cargo install cross
+matrix:
+  include:
+    # Linux
+    - name: "Travis Default Environment"
+      os: linux
+      env:
+        - TEST=1
+    - name: "Alpine Linux x86_64"
+      os: linux
+      env:
+        - TARGET=x86_64-unknown-linux-musl
+        - TEST=0
+    # OSX
+    - name: "OSX x86_64"
+      os: osx
+      env:
+        - TARGET=x86_64-apple-darwin
+        - TEST=1
+    # iOS
+    - name: "iOS x64"
+      os: "osx"
+      env:
+        - TARGET=aarch64-apple-ios
+        - TEST=0
+        - IOS=1
+    - name: "iOS ARM7"
+      os: "osx"
+      env:
+        - TARGET=armv7-apple-ios
+        - IOS=1
+    # Android
+    - name: "Android x64"
+      os: linux
+      env:
+        - TARGET=aarch64-linux-android
+        - TEST=0
+    - name: "Android ARM7"
+      os: linux
+      env:
+        - TARGET=armv7-linux-androideabi
+        - TEST=0
 script:
-  - cargo build --verbose
-  - cargo test --verbose
-  - cargo fmt -- --check
+  - ./.travis_scripts/cross-test.sh
 after_success:
   - ./.travis_scripts/cmp-bench.sh

.travis_scripts/cmp-bench.sh

@@ -3,7 +3,7 @@
 set -e
 set -x
 
-if [ "${TRAVIS_PULL_REQUEST_BRANCH:-$TRAVIS_BRANCH}" != "master" ]; then
+if [ "${TRAVIS_PULL_REQUEST_BRANCH:-$TRAVIS_BRANCH}" != "master" ] && [ -z "${TARGET}" ]; then
     REMOTE_URL="$(git config --get remote.origin.url)"
     cargo install critcmp
 

.travis_scripts/cross-test.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+set -e
+set -x
+
+# If no target specified, run a normal cargo build and format check
+if [ -z "${TARGET}" ]; then
+    cargo build --verbose
+    cargo fmt -- --check
+# Cross doesn't have support for ios targets, so manually add/build them with cargo
+elif [ "$IOS" = 1 ]; then
+    rustup target add "$TARGET"
+    cargo build --target "$TARGET"
+# Otherwise use cross to build for the specified argument
+else
+    cross build --target "$TARGET"
+fi
+
+# Only run unit tests if architecture specifies that we should
+if [ "$TEST" = 1 ]; then
+    if [ -z "${TARGET}" ]; then
+        cargo test --verbose
+    else
+        cross test --target "$TARGET"
+    fi
+fi