Disable ccache log print due to threadunsafety

ci/docker/runtime_functions.sh

@@ -110,23 +110,6 @@ build_jetson() {
     popd
 }
 
-report_ccache_usage() {
-    set -ex
-    pushd .
-
-    # Show global ccache summary at the end of each run.
-    ccache -s
-    if [ -e $CCACHE_LOGFILE ]
-    then
-        # Display local ccache log, excluding some overly verbose output.
-        cat $CCACHE_LOGFILE | grep -v "Config:" | grep -v "stats.lock"
-    else
-        echo "No ccache log found."
-    fi
-
-    popd
-}
-
 #
 # ARM builds
 #
@@ -159,7 +142,6 @@ build_armv6() {
         -G Ninja /work/mxnet
 
     ninja -v
-    report_ccache_usage
     build_wheel
     popd
 }
@@ -191,7 +173,6 @@ build_armv7() {
         -G Ninja /work/mxnet
 
     ninja -v
-    report_ccache_usage
     build_wheel
     popd
 }
@@ -210,7 +191,6 @@ build_armv8() {
         -DUSE_MKL_IF_AVAILABLE=OFF\
         -G Ninja /work/mxnet
     ninja -v
-    report_ccache_usage
     build_wheel
 }
 
@@ -237,7 +217,6 @@ build_android_armv7() {
         -DUSE_MKL_IF_AVAILABLE=OFF\
         -G Ninja /work/mxnet
     ninja -v
-    report_ccache_usage
 }
 
 build_android_armv8() {
@@ -270,8 +249,6 @@ build_centos7_cpu() {
         USE_BLAS=openblas \
         USE_DIST_KVSTORE=1 \
         -j$(nproc)
-
-    report_ccache_usage
 }
 
 build_amzn_linux_cpu() {
@@ -289,7 +266,6 @@ build_amzn_linux_cpu() {
         -DUSE_DIST_KVSTORE=ON\
         -G Ninja /work/mxnet
     ninja -v
-    report_ccache_usage
 }
 
 
@@ -306,8 +282,6 @@ build_centos7_mkldnn() {
         USE_MKLDNN=1 \
         USE_BLAS=openblas \
         -j$(nproc)
-
-    report_ccache_usage
 }
 
 build_centos7_gpu() {
@@ -341,26 +315,19 @@ build_ubuntu_cpu_openblas() {
         USE_BLAS=openblas             \
         USE_DIST_KVSTORE=1            \
         -j$(nproc)
-
-    report_ccache_usage
 }
 
 build_ubuntu_cpu_clang39() {
     set -ex
-
-    export CXX=clang++-3.9
+     export CXX=clang++-3.9
     export CC=clang-3.9
-
-    build_ccache_wrappers
-
-    make \
+     build_ccache_wrappers
+     make \
         USE_CPP_PACKAGE=1             \
         USE_BLAS=openblas             \
         USE_OPENMP=0                  \
         USE_DIST_KVSTORE=1            \
         -j$(nproc)
-
-    report_ccache_usage
 }
 
 build_ubuntu_cpu_clang50() {
@@ -377,8 +344,6 @@ build_ubuntu_cpu_clang50() {
         USE_OPENMP=1                  \
         USE_DIST_KVSTORE=1            \
         -j$(nproc)
-
-    report_ccache_usage
 }
 
 build_ubuntu_cpu_clang39_mkldnn() {
@@ -395,8 +360,6 @@ build_ubuntu_cpu_clang39_mkldnn() {
         USE_MKLDNN=1                  \
         USE_OPENMP=0                  \
         -j$(nproc)
-
-    report_ccache_usage
 }
 
 build_ubuntu_cpu_clang50_mkldnn() {
@@ -413,8 +376,6 @@ build_ubuntu_cpu_clang50_mkldnn() {
         USE_MKLDNN=1                  \
         USE_OPENMP=1                  \
         -j$(nproc)
-
-    report_ccache_usage
 }
 
 build_ubuntu_cpu_mkldnn() {
@@ -428,8 +389,6 @@ build_ubuntu_cpu_mkldnn() {
         USE_BLAS=openblas             \
         USE_MKLDNN=1                  \
         -j$(nproc)
-
-    report_ccache_usage
 }
 
 build_ubuntu_gpu() {
@@ -450,8 +409,6 @@ build_ubuntu_gpu_mkldnn() {
         USE_CUDA_PATH=/usr/local/cuda \
         USE_CUDNN=1                   \
         -j$(nproc)
-
-    report_ccache_usage
 }
 
 build_ubuntu_gpu_mkldnn_nocudnn() {
@@ -467,8 +424,6 @@ build_ubuntu_gpu_mkldnn_nocudnn() {
         USE_CUDA_PATH=/usr/local/cuda \
         USE_CUDNN=0                   \
         -j$(nproc)
-
-    report_ccache_usage
 }
 
 build_ubuntu_gpu_cuda91_cudnn7() {
@@ -515,7 +470,6 @@ build_ubuntu_gpu_cmake_mkldnn() {
         /work/mxnet
 
     ninja -v
-    report_ccache_usage
     # libmkldnn.so.0 is a link file. We need an actual binary file named libmkldnn.so.0.
     cp 3rdparty/mkldnn/src/libmkldnn.so.0 3rdparty/mkldnn/src/libmkldnn.so.0.tmp
     mv 3rdparty/mkldnn/src/libmkldnn.so.0.tmp 3rdparty/mkldnn/src/libmkldnn.so.0
@@ -537,7 +491,6 @@ build_ubuntu_gpu_cmake() {
         /work/mxnet
 
     ninja -v
-    report_ccache_usage
 }