Using ccache

Introduction

ccache 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). If ccache is found on the system it is automatically used.

Configuration

Add the following line to your ccache config file which is required for pre-compiled headers:

sloppiness = pch_defines,time_macros

See the ccache docs for other available options.

ccache and Clang

Set the option run_second_cpp = true or export CCACHE_CPP2=true to suppress lots of false positive compiler warnings.

Usage on eve

Just load the module:

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