ci:travis ci: Use ccache and add gcc 6 build config

Also make the build noisier to prevent some build failures when download
speeds are slow from whatever repository.

Note: The 64-bit devel build currently doesn't benefit from ccache for
whatever reason.

[skip appveyor]

.travis.yml

@@ -3,24 +3,31 @@ language: cpp
 sudo: required
 dist: trusty
 
+cache: ccache
+
 matrix:
   include:
-# Version 5 seems to be whatever is latest - for now it's 5.3
+    - env: VERSION=6 BITS=32
+      compiler: gcc-6-32
+      os: linux
     - env: VERSION=5 BITS=32
-      compiler: gcc
+      compiler: gcc-5-32
       os: linux
     - env: VERSION=4.9 BITS=32
-      compiler: gcc
+      compiler: gcc-4.9-32
       os: linux
     - env: VERSION=3.7 BITS=32
-      compiler: clang
+      compiler: clang-3.7-32
       os: linux
     - env: VERSION=4.9 BITS=64
-      compiler: gcc
+      compiler: gcc-4.9-64
       os: linux
 
 before_install:
   - ./travis.sh before_install
 
 script:
   - ./travis.sh script
+
+after_success:
+  - ./travis.sh after_success

travis.sh

@@ -30,7 +30,7 @@ linux_32_before_install() {
 	# build image. libgtk2.0-dev:i386 and libsdl2-dev:i386 require the 32-bit
 	# versions of the dependencies, and the 2 versions conflict. So those
 	# dependencies must be explicitly installed.
-	sudo apt-get -qq -y install \
+	sudo apt-get -y install \
 		gir1.2-freedesktop:i386 \
 		gir1.2-gdkpixbuf-2.0:i386 \
 		gir1.2-glib-2.0:i386 \
@@ -51,12 +51,22 @@ linux_32_before_install() {
 		portaudio19-dev:i386 \
 		zlib1g-dev:i386 \
 		${COMPILER_PACKAGE}
+
+	# Manually add ccache symlinks for clang
+	if [ "${CXX}" = "clang++" ]; then
+		sudo ln -sf ../../bin/ccache /usr/lib/ccache/${CXX}-${VERSION}
+		sudo ln -sf ../../bin/ccache /usr/lib/ccache/${CC}-${VERSION}
+	fi
 }
 
 linux_32_script() {
 	mkdir build
 	cd build
 
+	# Prevents warning spam
+	if [ "${CXX}" = "clang++" ]; then
+		export CCACHE_CPP2=yes
+	fi
 	export CC=${CC}-${VERSION} CXX=${CXX}-${VERSION}
 	cmake \
 		-DCMAKE_TOOLCHAIN_FILE=cmake/linux-compiler-i386-multilib.cmake \
@@ -86,7 +96,7 @@ linux_64_before_install() {
 
 	# libgl1-mesa-dev, liblzma-dev, libxext-dev, zlib1g-dev already installed on
 	# build worker, I put these here in case the build image changes.
-	sudo apt-get -qq -y install \
+	sudo apt-get -y install \
 		libaio-dev \
 		libasound2-dev \
 		libgtk2.0-dev \
@@ -96,13 +106,23 @@ linux_64_before_install() {
 		libwxgtk3.0-dev \
 		portaudio19-dev \
 		${COMPILER_PACKAGE}
+
+	# Manually add ccache symlinks for clang
+	if [ "${CXX}" = "clang++" ]; then
+		sudo ln -sf ../../bin/ccache /usr/lib/ccache/${CXX}-${VERSION}
+		sudo ln -sf ../../bin/ccache /usr/lib/ccache/${CC}-${VERSION}
+	fi
 }
 
 
 linux_64_script() {
 	mkdir build
 	cd build
 
+	# Prevents warning spam
+	if [ "${CXX}" = "clang++" ]; then
+		export CCACHE_CPP2=yes
+	fi
 	export CC=${CC}-${VERSION} CXX=${CXX}-${VERSION}
 	cmake \
 		-DCMAKE_BUILD_TYPE=Devel \
@@ -114,11 +134,18 @@ linux_64_script() {
 	make -j3 install
 }
 
+linux_after_success() {
+	ccache -s
+}
+
 # Just in case I do manual testing and accidentally insert "rm -rf /"
 case "${1}" in
 before_install|script)
 	${TRAVIS_OS_NAME}_${BITS}_${1}
 	;;
+after_success)
+	${TRAVIS_OS_NAME}_${1}
+	;;
 *)
 	echo "Unknown command" && false
 	;;