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CACHING-WITH-CCACHE.md

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Caching compilation results with ccache

If you are in the process of writing a compilation script, then re-running the script over and over is very time-consuming. Holy Build Box includes with ccache so that subsequent compiler runs finish quickly.

You can use ccache by setting the CC, CXX and CCACHE_DIR environment variables.

First, create a directory in which ccache should store its cache files:

mkdir -p cache

Then invoke the compilation script as follows:

docker run -t -i --rm \
  -e CC='ccache gcc' \
  -e CXX='ccache g++' \
  -e CCACHE_DIR='/io/cache' \
  -v `pwd`:/io \
  phusion/holy-build-box-64:latest \
  bash /io/compile.sh