[build] use ccache

.travis.yml

@@ -30,64 +30,64 @@ matrix:
     # OS X - Xcode 7 - Debug
     - os: osx
       osx_image: xcode7
-      compiler: ": xcode-debug"
+      compiler: clang
       env: FLAVOR=osx BUILDTYPE=Debug
 
 
     # OS X/Node.js 5 - Xcode 7
     - os: osx
       osx_image: xcode7
-      compiler: ": node5-xcode"
+      compiler: clang
       env: FLAVOR=node NODE_VERSION=5
 
     # OS X/Node.js 4 - Xcode 7
     - os: osx
       osx_image: xcode7
-      compiler: ": node4-xcode"
+      compiler: clang
       env: FLAVOR=node NODE_VERSION=4
 
     # OS X/Node.js 0.10 - Xcode 7
     - os: osx
       osx_image: xcode7
-      compiler: ": node0.10-xcode"
+      compiler: clang
       env: FLAVOR=node NODE_VERSION=0.10
 
 
     # Linux/Node.js 5 - Clang 3.5 - Release
     - os: linux
       compiler: ": node5-clang35-release"
-      env: FLAVOR=node BUILDTYPE=Release NODE_VERSION=5 _CXX=clang++-3.5 _CC=clang-3.5
+      env: FLAVOR=node BUILDTYPE=Release NODE_VERSION=5 _CXX=clang++-3.5 _CC=clang-3.5 CCACHE=1
       addons: *clang35
 
     # Linux/Node.js 4 - Clang 3.5 - Release
     - os: linux
       compiler: ": node4-clang35-release"
-      env: FLAVOR=node BUILDTYPE=Release NODE_VERSION=4 _CXX=clang++-3.5 _CC=clang-3.5
+      env: FLAVOR=node BUILDTYPE=Release NODE_VERSION=4 _CXX=clang++-3.5 _CC=clang-3.5 CCACHE=1
       addons: *clang35
 
     # Linux/Node.js 0.10 - Clang 3.5 - Release
     - os: linux
       compiler: ": node0.10-clang35-release"
-      env: FLAVOR=node BUILDTYPE=Release NODE_VERSION=0.10 _CXX=clang++-3.5 _CC=clang-3.5
+      env: FLAVOR=node BUILDTYPE=Release NODE_VERSION=0.10 _CXX=clang++-3.5 _CC=clang-3.5 CCACHE=1
       addons: *clang35
 
 
     # Linux - GCC 4.9 - Release
     - os: linux
       compiler: ": linux-gcc49-release"
-      env: FLAVOR=linux BUILDTYPE=Release _CXX=g++-4.9 _CC=gcc-4.9
+      env: FLAVOR=linux BUILDTYPE=Release _CXX=g++-4.9 _CC=gcc-4.9 CCACHE=1
       addons: *gcc49
 
     # Linux - Clang 3.5 - Debug
     - os: linux
       compiler: ": linux-clang35-debug"
-      env: FLAVOR=linux BUILDTYPE=Debug _CXX=clang++-3.5 _CC=clang-3.5
+      env: FLAVOR=linux BUILDTYPE=Debug _CXX=clang++-3.5 _CC=clang-3.5 CCACHE=1
       addons: *clang35
 
     # Linux - Clang 3.5 - Release
     - os: linux
       compiler: ": linux-clang35-release"
-      env: FLAVOR=linux BUILDTYPE=Release _CXX=clang++-3.5 _CC=clang-3.5
+      env: FLAVOR=linux BUILDTYPE=Release _CXX=clang++-3.5 _CC=clang-3.5 CCACHE=1
       addons: *clang35
 
     # clang-tidy - Clang 3.8 - Release
@@ -96,6 +96,13 @@ matrix:
       env: FLAVOR=linux ACTION=tidy BUILDTYPE=Release _CXX=clang++-3.8 _CC=clang-3.8 AWS_ACCESS_KEY_ID=
       addons: *clang38-tidy
 
+cache:
+  directories:
+    - $HOME/.ccache
+    - $HOME/.cache/pip
+    - $HOME/build/mapbox/mapbox-gl-native/.binaries
+    - $HOME/build/mapbox/mapbox-gl-native/.scripts
+
 env:
   global:
     - TERM: dumb
@@ -113,14 +120,15 @@ env:
     - KIF_SCREENSHOTS="${TRAVIS_BUILD_DIR}/screenshots"
 
 before_install:
-- if [ ! -z "${_CXX}" ]; then export CXX="${_CXX}" ; fi
-- if [ ! -z "${_CC}" ]; then export CC="${_CC}" ; fi
-- ${CXX} --version
+- source ./scripts/set_compiler.sh
 - source ./scripts/travis_helper.sh
 
 install:
 - ./scripts/${FLAVOR}/install.sh
 
+before_script:
+- if command -v ccache >/dev/null 2>&1; then ccache --zero-stats ; fi
+
 script:
 - ./scripts/${FLAVOR}/${ACTION:-run}.sh
 
@@ -128,6 +136,7 @@ after_failure:
 - "[ -f ./scripts/${FLAVOR}/after_failure.sh ] && ./scripts/${FLAVOR}/after_failure.sh"
 
 after_script:
+- if command -v ccache >/dev/null 2>&1; then ccache --show-stats ; fi
 - "[ -f ./scripts/${FLAVOR}/after_script.sh ] && ./scripts/${FLAVOR}/after_script.sh"
 
 notifications:

scripts/set_compiler.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+
+if [ ! -z "${_CXX}" ]; then export CXX="${_CXX}" ; fi
+if [ ! -z "${_CC}" ]; then export CC="${_CC}" ; fi
+
+if [ "${CCACHE:-0}" -ge 1 ]; then
+    export CXX="ccache ${CXX}"
+    export CC="ccache ${CC}"
+
+    # ccache splits up the compile steps, so we end up with unused arguments in some steps.
+    # Clang also thinks that ccache isn't interactive, so we explicitly need to enable color.
+    if [ $(echo | ${CXX} -dM -E - | grep -c "#define __clang__ 1") -ge 1 ]; then
+        export CXX="${CXX} -Qunused-arguments -fcolor-diagnostics"
+        export CC="${CC} -Qunused-arguments -fcolor-diagnostics"
+    else
+        # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60304
+        # GCC normally throws this error which is in GTest, but *only* when compilation and
+        # preprocessing aren't combined in one step. However, when using ccache with GCC, we are
+        # running them in separate steps, so this warning/error is shown.
+        export CXX="${CXX} -Wno-conversion-null"
+        export CC="${CC} -Wno-conversion-null"
+    fi
+fi
+
+echo "export CXX=\"${CXX}\""
+echo "export CC=\"${CC}\""
+${CXX} --version