Using a compiler cache

Introduction

A compiler cache speeds up compilation times by caching object files and reusing them on subsequent builds. This even works for complete rebuilds (i.e. deleting the full build-directory). The compiler cache Ccache is automatically used when it is found by CMake.

sudo apt install ccache

module load /global/apps/modulefiles/ccache/3.3.3

brew install ccache

You may want to change the cache directory (environment variable CCACHE_DIR) or increase the cache size (e.g. run ccache -M 10G once or set the environment variable CCACHE_MAXSIZE). See the Ccache docs for configuration instructions.

You can check cache hit statistics with ccache -s.

To disable caching:

cmake . -DOGS_DISABLE_COMPILER_CACHE=ON