Use CCache on Travis (#24998)

[av skip] [bsd skip]

Author: ararslan

.travis.yml

@@ -11,6 +11,7 @@ matrix:
           sources:
             - ubuntu-toolchain-r-test
           packages:
+            - ccache
             - libssl1.0.0
             - bar
             - time
@@ -31,6 +32,7 @@ matrix:
           sources:
             - ubuntu-toolchain-r-test
           packages:
+            - ccache
             - libssl1.0.0
             - bar
             - time
@@ -39,11 +41,7 @@ matrix:
     - os: osx
       env: ARCH="x86_64"
       osx_image: xcode8
-cache:
-  directories:
-    - $TRAVIS_BUILD_DIR/deps/srccache
-    - $TRAVIS_BUILD_DIR/deps/scratch
-    - $TRAVIS_BUILD_DIR/deps/usr-staging
+cache: ccache
 branches:
   only:
     - master
@@ -72,22 +70,23 @@ before_install:
         ln -s /usr/bin/g++-5 $HOME/bin/x86_64-linux-gnu-g++;
         gcc --version;
         BAR="bar -i 30";
-        BUILDOPTS="-j5 VERBOSE=1 FORCE_ASSERTIONS=1 LLVM_ASSERTIONS=1";
+        BUILDOPTS="-j5 VERBOSE=1 FORCE_ASSERTIONS=1 LLVM_ASSERTIONS=1 USECCACHE=1";
         echo "override ARCH=$ARCH" >> Make.user;
         sudo sh -c "echo 0 > /proc/sys/net/ipv6/conf/lo/disable_ipv6";
         export JULIA_CPU_CORES=4;
         export JULIA_TEST_MAXRSS_MB=1200;
         TESTSTORUN="all";
       elif [ `uname` = "Darwin" ]; then
         brew update;
-        brew install -v jq pv;
+        brew install -v jq pv ccache;
+        export PATH="$(brew --prefix ccache)/libexec:$PATH";
         BAR="pv -i 30";
         contrib/travis_fastfail.sh || exit 1;
         brew tap staticfloat/julia;
         brew rm --force $(brew deps --HEAD julia);
         brew install -v --only-dependencies --HEAD julia;
         brew install -v staticfloat/juliadeps/libgfortran llvm39-julia;
-        BUILDOPTS="-j3 USECLANG=1 LLVM_CONFIG=$(brew --prefix llvm39-julia)/bin/llvm-config LLVM_SIZE=$(brew --prefix llvm39-julia)/bin/llvm-size";
+        BUILDOPTS="-j3 USECLANG=1 USECCACHE=1 LLVM_CONFIG=$(brew --prefix llvm39-julia)/bin/llvm-config LLVM_SIZE=$(brew --prefix llvm39-julia)/bin/llvm-size";
         BUILDOPTS="$BUILDOPTS VERBOSE=1 USE_BLAS64=0 SUITESPARSE_INC=-I$(brew --prefix suite-sparse-julia)/include FORCE_ASSERTIONS=1";
         BUILDOPTS="$BUILDOPTS LIBBLAS=-lopenblas LIBBLASNAME=libopenblas LIBLAPACK=-lopenblas LIBLAPACKNAME=libopenblas";
         for lib in LLVM SUITESPARSE ARPACK BLAS LAPACK GMP MPFR PCRE LIBUNWIND; do