From b8f7f2306b3baafdf2c3f740184a67d67b762118 Mon Sep 17 00:00:00 2001
From: Lucas De Marchi <lucas.demarchi@intel.com>
Date: Tue, 24 Nov 2015 23:40:14 -0200
Subject: [PATCH] travis: cache compilers

This currently removes around 25s from compilation time while also being
more resilient to network outages. The drawback is that when changing
the compiler we may need to clean the caches.
---
 .travis.yml | 33 ++++++++++++++++++++++++---------
 1 file changed, 24 insertions(+), 9 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 7ab67b226b..2b765fd4ee 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,10 @@
 language: cpp
 sudo: false
 
+cache:
+  directories:
+    - $HOME/opt
+
 addons:
   apt:
     sources:
@@ -25,19 +29,30 @@ addons:
     branch_pattern: coverity_scan
 
 before_install:
-  - pushd .
-    && cd ~
-    && wget http://firmware.diydrones.com/Tools/PX4-tools/gcc-arm-none-eabi-4_9-2015q3-20150921-linux.tar.bz2
-    && tar -xf gcc-arm-none-eabi-4_9-2015q3-20150921-linux.tar.bz2
-    && wget http://firmware.diydrones.com/Tools/Travis/NavIO/master.tar.gz
-    && tar -xf master.tar.gz
-    && mkdir -p $HOME/bin
+  - pushd $HOME
+  - pushd $HOME/opt
+  # PX4 toolchain
+  - compiler="gcc-arm-none-eabi-4_9-2015q3"
+  - if [ ! -d "$HOME/opt/$compiler" ]; then
+      wget http://firmware.diydrones.com/Tools/PX4-tools/gcc-arm-none-eabi-4_9-2015q3-20150921-linux.tar.bz2
+      && tar -xf gcc-arm-none-eabi-4_9-2015q3-20150921-linux.tar.bz2
+      ;
+    fi
+  # RPi toolchain
+  - compiler="tools-master/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64"
+  - if [ ! -d "$HOME/opt/$compiler" ]; then
+      wget http://firmware.diydrones.com/Tools/Travis/NavIO/master.tar.gz
+      && tar -xf master.tar.gz
+      ;
+    fi
+  - popd
+  - mkdir -p $HOME/bin
     && ln -sf /usr/bin/gcc-4.8 $HOME/bin/gcc
     && ln -sf /usr/bin/g++-4.8 $HOME/bin/g++
-    && exportline="export PATH=$HOME/bin:$HOME/gcc-arm-none-eabi-4_9-2015q3/bin:$HOME/tools-master/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin:\$PATH"
+    && exportline="export PATH=$HOME/bin:$HOME/opt/gcc-arm-none-eabi-4_9-2015q3/bin:$HOME/opt/tools-master/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin:\$PATH"
     && if grep -Fxq "$exportline" ~/.profile; then echo nothing to do ; else echo $exportline >> ~/.profile; fi
     && . ~/.profile
-    && popd
+  - popd
 
 script:
   - Tools/scripts/build_all_travis.sh