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.\" $FreeBSD$
Set to use
.Xr ccache 1
for the build.
No configuration is required except to install the
.Sy devel/ccache
package.
Using with
.Xr distcc 1
should set
.Sy CCACHE_PREFIX=/usr/local/bin/distcc .
The default cache directory of
.Pa $HOME/.ccache
will be used, which can be overridden by setting
.Sy CCACHE_DIR .
The
.Sy CCACHE_COMPILERCHECK
option defaults to
.Sy content
when using the in-tree bootstrap compiler,
and
.Sy mtime
when using an external compiler.
The
.Sy CCACHE_CPP2
option is used for Clang but not GCC.
ccache works best when combined with the
.Sy WITH_FAST_DEPEND
option.
.Pp
Sharing a cache between multiple work directories requires using a layout
similar to
.Pa /some/prefix/src
.Pa /some/prefix/obj
and an environment such as:
.Bd -literal -offset indent
CCACHE_BASEDIR='${SRCTOP:H}' MAKEOBJDIRPREFIX='${SRCTOP:H}/obj'
.Ed
.Pp
See
.Xr ccache 1
for more configuration options.
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