travis: enable ccache

Primarily this combats the long time it takes to build qemu in
our build scripts. Practically, cuts a couple of minutes from build.

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

.travis.yml

@@ -1,5 +1,7 @@
 language: c
 
+cache: ccache
+
 env:
     matrix:
     - RUN_ON_CONTAINER=ubuntu-12.04
@@ -28,7 +30,7 @@ before_install:
 script:
     - if [ ${COVERITY_SCAN_BRANCH} != 1 ]; then
        docker build -t ${RUN_ON_CONTAINER} -f opal-ci/Dockerfile-${RUN_ON_CONTAINER} . &&
-       docker run --rm -t $RUN_ON_CONTAINER;
+       docker run --volume $HOME/.ccache:/root/.ccache --rm -t $RUN_ON_CONTAINER;
       fi
     - if [ ${COVERITY_SCAN_BRANCH} == 1 ]; then
         sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test &&

opal-ci/Dockerfile-centos6

@@ -1,6 +1,6 @@
 FROM centos:6
 RUN yum -y update && yum clean all
-RUN yum -y install wget xterm gcc git xz
+RUN yum -y install wget xterm gcc git xz ccache
 RUN wget https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.8.0/x86_64-gcc-4.8.0-nolibc_powerpc64-linux.tar.xz
 RUN mkdir /opt/cross
 RUN tar -C /opt/cross -xf x86_64-gcc-4.8.0-nolibc_powerpc64-linux.tar.xz

opal-ci/Dockerfile-centos7

@@ -1,6 +1,6 @@
 FROM centos:7
 RUN yum -y update && yum clean all
-RUN yum -y install wget xterm gcc git xz make diffutils findutils expect valgrind valgrind-devel
+RUN yum -y install wget xterm gcc git xz make diffutils findutils expect valgrind valgrind-devel ccache
 RUN wget https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.8.0/x86_64-gcc-4.8.0-nolibc_powerpc64-linux.tar.xz
 RUN mkdir /opt/cross
 RUN tar -C /opt/cross -xf x86_64-gcc-4.8.0-nolibc_powerpc64-linux.tar.xz

opal-ci/Dockerfile-fedora24

@@ -1,5 +1,5 @@
 FROM fedora:24
-RUN dnf -y install wget xterm gcc git xz make diffutils findutils expect valgrind valgrind-devel
+RUN dnf -y install wget xterm gcc git xz make diffutils findutils expect valgrind valgrind-devel ccache
 RUN dnf -y install gcc-powerpc64-linux-gnu 
 COPY . /build/
 WORKDIR /build

opal-ci/Dockerfile-ubuntu-12.04

@@ -3,7 +3,7 @@ RUN sudo apt-get update -qq
 RUN sudo apt-get install -y software-properties-common
 RUN sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
 RUN sudo apt-get update -qq
-RUN sudo apt-get install -y gcc-4.8 libstdc++6 valgrind expect xterm
+RUN sudo apt-get install -y gcc-4.8 libstdc++6 valgrind expect xterm ccache
 RUN sudo apt-get install -y gcc-arm-linux-gnueabi gcc-powerpc64le-linux-gnu gcc
 RUN sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 50
 RUN sudo apt-get install -y wget

opal-ci/Dockerfile-ubuntu-16.04

@@ -1,6 +1,6 @@
 FROM ubuntu:16.04
 RUN apt-get update -qq
-RUN apt-get install -y gcc-powerpc64le-linux-gnu gcc
+RUN apt-get install -y gcc-powerpc64le-linux-gnu gcc ccache
 RUN apt-get install -y wget xterm
 RUN apt-get install -y gcc-arm-linux-gnueabi
 RUN wget ftp://public.dhe.ibm.com/software/server/powerfuncsim/p8/packages/v1.0-2/systemsim-p8_1.0-2_amd64.deb

opal-ci/Dockerfile-ubuntu-latest

@@ -1,6 +1,6 @@
 FROM ubuntu:latest
 RUN apt-get update -qq
-RUN apt-get install -y gcc-powerpc64le-linux-gnu gcc
+RUN apt-get install -y gcc-powerpc64le-linux-gnu gcc ccache
 RUN apt-get install -y wget xterm
 RUN apt-get install -y gcc-arm-linux-gnueabi
 RUN wget ftp://public.dhe.ibm.com/software/server/powerfuncsim/p8/packages/v1.0-2/systemsim-p8_1.0-2_amd64.deb

opal-ci/build-qemu-powernv.sh

@@ -4,5 +4,7 @@ set -e
 git clone --depth=1 -b qemu-powernv-for-skiboot-3 git://github.com/open-power/qemu.git
 cd qemu
 git submodule update --init dtc
+export CC="ccache gcc"
+export CXX="ccache g++"
 ./configure --target-list=ppc64-softmmu --disable-werror
 make -j `grep -c processor /proc/cpuinfo`