Fix build_ccache_wrappers:

* Fix broken links
* Make it idempotent
fixes apache#13456
fixes apache#14117
fixes apache#11516

ci/docker/runtime_functions.sh

@@ -66,37 +66,29 @@ build_ccache_wrappers() {
  # But in the beginning, we'll make this opt-in. In future, loads of processes like
  # the scala make step or numpy compilation and other pip package generations
  # could be heavily sped up by using ccache as well.
- mkdir /tmp/ccache-redirects
+ mkdir -p /tmp/ccache-redirects
  export PATH=/tmp/ccache-redirects:$PATH
- ln -s ccache /tmp/ccache-redirects/gcc
- ln -s ccache /tmp/ccache-redirects/gcc-8
- ln -s ccache /tmp/ccache-redirects/g++
- ln -s ccache /tmp/ccache-redirects/g++-8
- ln -s ccache /tmp/ccache-redirects/nvcc
- ln -s ccache /tmp/ccache-redirects/clang++-3.9
- ln -s ccache /tmp/ccache-redirects/clang-3.9
- ln -s ccache /tmp/ccache-redirects/clang++-5.0
- ln -s ccache /tmp/ccache-redirects/clang-5.0
- ln -s ccache /tmp/ccache-redirects/clang++-6.0
- ln -s ccache /tmp/ccache-redirects/clang-6.0
- ln -s ccache /usr/local/bin/gcc
- ln -s ccache /usr/local/bin/gcc-8
- ln -s ccache /usr/local/bin/g++
- ln -s ccache /usr/local/bin/g++-8
- ln -s ccache /usr/local/bin/nvcc
- ln -s ccache /usr/local/bin/clang++-3.9
- ln -s ccache /usr/local/bin/clang-3.9
- ln -s ccache /usr/local/bin/clang++-5.0
- ln -s ccache /usr/local/bin/clang-5.0
- ln -s ccache /usr/local/bin/clang++-6.0
- ln -s ccache /usr/local/bin/clang-6.0
-
- export NVCC=ccache
+ CCACHE=`which ccache`
+ ln -sf $CCACHE /tmp/ccache-redirects/gcc
+ ln -sf $CCACHE /tmp/ccache-redirects/gcc-8
+ ln -sf $CCACHE /tmp/ccache-redirects/g++
+ ln -sf $CCACHE /tmp/ccache-redirects/g++-8
+ ln -sf $CCACHE /tmp/ccache-redirects/clang++-3.9
+ ln -sf $CCACHE /tmp/ccache-redirects/clang-3.9
+ ln -sf $CCACHE /tmp/ccache-redirects/clang++-5.0
+ ln -sf $CCACHE /tmp/ccache-redirects/clang-5.0
+ ln -sf $CCACHE /tmp/ccache-redirects/clang++-6.0
+ ln -sf $CCACHE /tmp/ccache-redirects/clang-6.0
+ #Doesn't work: https://github.com/ccache/ccache/issues/373
+ # ln -sf $CCACHE /tmp/ccache-redirects/nvcc
+ # ln -sf $CCACHE /tmp/ccache-redirects/nvcc
+ # export NVCC="/tmp/ccache-redirects/nvcc"
 
  # Uncomment if you would like to debug CCache hit rates.
  # You can monitor using tail -f ccache-log
- # export CCACHE_LOGFILE=/work/mxnet/ccache-log
- # export CCACHE_DEBUG=1
+ #export CCACHE_LOGFILE=/work/mxnet/ccache-log
+ #export CCACHE_LOGFILE=/tmp/ccache-log
+ #export CCACHE_DEBUG=1
 }
 
 build_wheel() {
@@ -667,8 +659,7 @@ build_ubuntu_gpu_mkldnn_nocudnn() {
 
 build_ubuntu_gpu_cuda100_cudnn7() {
  set -ex
- # unfortunately this build has problems in 3rdparty dependencies with ccache and make
- # build_ccache_wrappers
+ build_ccache_wrappers
  make \
  DEV=1 \
  ENABLE_TESTCOVERAGE=1 \