update build to use separate script for osx and linux.

Author: mlippautz

.travis.yml

@@ -14,14 +14,10 @@ compiler:
   - gcc
 
 before_install:
-# We need this line to have g++4.8 available in apt
-  - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
-  - sudo apt-get update -qq
+  - tools/travis_before_install.sh
 
 install:
-  - sudo apt-get install -qq gcc-4.8 g++-4.8 
-# We want to compile with g++ 4.8 when rather than the default g++
-  - sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 90
+  - tool/travis_install.sh
   - tools/make_deps.sh
 
 script:

tools/travis_before_install.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+if [[ $(uname -s) = "Darwin" ]]; then
+fi
+
+if [[ $(uname -s) = "Linux" ]]; then
+  # We need this to have g++4.8 available in apt
+  sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
+  sudo apt-get update -qq
+fi
+

tools/travis_install.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+if [[ $(uname -s) = "Darwin" ]]; then
+fi
+
+if [[ $(uname -s) = "Linux" ]]; then
+  sudo apt-get install -qq gcc-4.8 g++-4.8 
+  # We want to compile with g++ 4.8 when rather than the default g++
+  sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 90
+fi
+