Attempt to build gcc with apt.

Author: ed7coyne

.travis.yml

@@ -1,8 +1,6 @@
 language: c++
-# Need sudo for trusty.
-sudo: required
-# Trusty gives us GCC 4.8 which supports c++11.
-dist: trusty
+compiler:
+  - gcc
 env:
 - ARDUINO_VERSION=1.6.8 ARDUINO_ESP8266_VERSION=2.1.0 ARDUINO_ROOT=${HOME}/arduino-${ARDUINO_VERSION} ARDUINO_ESP8266_ROOT=${ARDUINO_ROOT}/hardware/esp8266com/esp8266 ARDUINO_HOME=${HOME}/Arduino
 - ARDUINO_VERSION=1.6.8 ARDUINO_ESP8266_VERSION=2.2.0-rc1 ARDUINO_ROOT=${HOME}/arduino-${ARDUINO_VERSION} ARDUINO_ESP8266_ROOT=${ARDUINO_ROOT}/hardware/esp8266com/esp8266 ARDUINO_HOME=${HOME}/Arduino
@@ -18,3 +16,10 @@ before_script:
 script:
 - ${ARDUINO_ROOT}/arduino-builder -verbose  -hardware ${ARDUINO_ROOT}/hardware/ -tools ${ARDUINO_ESP8266_ROOT}/tools/ -tools ${ARDUINO_ROOT}/tools-builder/ -fqbn esp8266com:esp8266:nodemcuv2 -libraries ${ARDUINO_HOME}/libraries/ -prefs build.flash_ld=${ARDUINO_ESP8266_ROOT}/tools/sdk/ld/eagle.flash.4m.ld -prefs build.flash_freq=40 -prefs build.flash_size=4M examples/FirebasePush_ESP8266/FirebasePush_ESP8266.ino
 - (cd test/modem/ && make test)
+addons:
+  apt:
+    sources:
+    - ubuntu-toolchain-r-test
+    packages:
+    - gcc-4.8
+    - g++-4.8