Readded Eclipse build

.travis.yml

@@ -1,15 +1,34 @@
 language: c
 
-os:
-  - linux
-  - osx
+cache:
+  directories:
+    - $HOME/Library/Caches/Homebrew/Cask
 
-install:
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then os_name=mac; else os_name=linux; fi
-  - wget "https://developer.arm.com/-/media/Files/downloads/gnu-rm/7-2017q4/gcc-arm-none-eabi-7-2017-q4-major-$os_name.tar.bz2"
+install: eclipse -noSplash
+         -application org.eclipse.equinox.p2.director
+         -repository http://gnuarmeclipse.sourceforge.net/updates
+         -installIUs ilg.gnuarmeclipse.managedbuild.cross.feature.group
+         -profileProperties org.eclipse.update.install.features=true
+
+before_script:
   - tar -xf gcc-arm-none-eabi-7-2017-q4-major-*.tar.bz2
   - export PATH=$PATH:$PWD/gcc-arm-none-eabi-7-2017-q4-major/bin
 
 script:
+  - eclipse -noSplash -application org.eclipse.cdt.managedbuilder.core.headlessbuild -import $TRAVIS_BUILD_DIR/left/build -import $TRAVIS_BUILD_DIR/right/build -build all
   - make -j2 -C left
   - make -j2 -C right
+
+matrix:
+  include:
+    - os: linux
+      sudo: required
+      before_install:
+        - curl https://nixos.org/nix/install | sh && . ~/.nix-profile/etc/profile.d/nix.sh
+        - nix-env -i eclipse-cpp
+        - wget "https://developer.arm.com/-/media/Files/downloads/gnu-rm/7-2017q4/gcc-arm-none-eabi-7-2017-q4-major-linux.tar.bz2"
+    - os: osx
+      env: PATH="$PATH:/Applications/Eclipse CPP.app/Contents/MacOS"
+      before_install:
+        - brew cask install eclipse-cpp
+        - wget "https://developer.arm.com/-/media/Files/downloads/gnu-rm/7-2017q4/gcc-arm-none-eabi-7-2017-q4-major-mac.tar.bz2"