Switched to using cpp as the default language and specifying arm in the makefile.

.travis.yml

@@ -11,14 +11,15 @@ env:
   - TARGET=SPARKY
   - TARGET=STM32F3DISCOVERY
   - TARGET=ALIENWIIF1
-language: c
-compiler: arm-none-eabi-gcc
+# We use cpp for unit tests, and c for the main project.
+language: cpp
+compiler: clang
 before_install: sudo add-apt-repository -y ppa:terry.guo/gcc-arm-embedded && sudo apt-get update
 install: sudo apt-get install build-essential gcc-arm-none-eabi git
-before_script: $CC --version
+before_script: arm-none-eabi-gcc --version
 script: make -j2
 
 notifications:
   irc: "chat.freenode.net#cleanflight"
   use_notice: true
-  skip_join: true
+  skip_join: true