Leverage ccache to reduce build times (both locally and on Travis-ci)

.travis.yml

@@ -23,10 +23,14 @@ env:
   matrix:
     - CMAKE_OPTS="-DBUILD_FEM_NETGEN=ON"
 
+cache:
+    - ccache
+
 language: cpp
 
 compiler:
    - clang
+   - gcc
 
 python: 2.7
 
@@ -37,6 +41,11 @@ os:
 dist: trusty
 sudo: required
 
+matrix:
+   exclude:
+     - os: osx
+       compiler: gcc
+
 git:
   depth: 1500
 
@@ -93,16 +102,24 @@ before_install:
                                swig                             \
                                libvtk6-dev                      \
                                libmed-dev                       \
-                               libmedc-dev                      
-                               
+                               libmedc-dev			\
+                               asciidoc
+
        #Patch the system - there is a bug related to invalid location of libs on ubuntu 12.04
        sudo ln -s /usr/lib/x86_64-linux-gnu/ /usr/lib/i386-linux-gnu
        sudo find /usr/lib -name libpq.so -exec ln -s {} /usr/lib/libpq.so ';'
        export DISPLAY=:99.0
        sh -e /etc/init.d/xvfb start
 
-       CMAKE_ARGS="${CMAKE_OPTS} -DPYTHON_EXECUTABLE=/usr/bin/python"
-       INSTALLED_APP_PATH="/usr/local/bin/FreeCAD"
+       #Install ccache to reduce successive build times (use 3.2.5+ to avoid spurious warnings)
+       curl -L -o ccache.tgz "https://codeload.github.com/ccache/ccache/tar.gz/v3.2.5"
+       tar xvzf ccache.tgz && rm ccache.tgz && cd ccache-*
+       ./autogen.sh && ./configure CC=gcc && sudo make install
+       cd ..
+
+       export CCACHE_CPP2=YES
+       export CMAKE_ARGS="${CMAKE_OPTS} -DPYTHON_EXECUTABLE=/usr/bin/python"
+       export INSTALLED_APP_PATH="/usr/local/bin/FreeCAD"
        ;;
 
    "osx")
@@ -123,7 +140,8 @@ before_install:
                     orocos-kdl                  \
                     hdf5                        \
                     homebrew/science/oce        \
-                    homebrew/python/matplotlib
+                    homebrew/python/matplotlib  \
+                    ccache
        brew install homebrew/science/nglib --with-oce
        brew install sanelson/freecad/coin --without-framework --without-soqt
        brew install sanelson/freecad/pivy --HEAD
@@ -140,8 +158,8 @@ before_install:
        #Remove GDAL if installed because it results in non-existent dependent library exceptions
        if [ -e /usr/local/lib/libgdal.1.dylib ]; then brew unlink gdal; fi
 
-       CMAKE_ARGS="${CMAKE_OPTS} -DFREECAD_USE_EXTERNAL_KDL=ON -DFREECAD_CREATE_MAC_APP=ON"
-       INSTALLED_APP_PATH="/usr/local/FreeCAD.app/Contents/bin/FreeCAD"
+       export CMAKE_ARGS="${CMAKE_OPTS} -DFREECAD_USE_EXTERNAL_KDL=ON -DFREECAD_CREATE_MAC_APP=ON"
+       export INSTALLED_APP_PATH="/usr/local/FreeCAD.app/Contents/bin/FreeCAD"
        ;;
 
    *)

CMakeLists.txt

@@ -23,6 +23,11 @@ if(COMMAND cmake_policy)
     endif(POLICY CMP0045)
 endif(COMMAND cmake_policy)
 
+find_program(CCACHE_PROGRAM ccache)  #This check should occur before project()
+if(CCACHE_PROGRAM)
+    set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE "${CCACHE_PROGRAM}")
+endif()
+
 # include local  modules
 include(AddFileDependencies)
 include(cMake/FreeCadMacros.cmake)