Cleaning Up
Execute % m clean to clean up the binaries you just created. You can also execute % m clobber to get rid of the binaries of all combos. % m clobber is equivalent to removing the //out/ directory where all generated files are stored.
Speeding Up Rebuilds
The binaries of each combo are stored as distinct sub-directories of //out/, making it possible to quickly switch between combos without having to recompile all sources each time.
However, performing a clean rebuild is necessary if the build system doesn't catch changes to environment variables or makefiles. If this happens often, you should define the USE_CCACHE environment variable as shown below:
% export USE_CCACHE=1
Doing so will force the build system to use the ccache compiler cache tool, which reduces recompiling all sources.
ccache binaries are provided in //prebuilt/... and don't need to get installed on your system.
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