- update to 4.8:
  * Improved the automatic cache cleanup mechanism. Automatic
    cleanups are now performed on 1/256 of the cache instead of
    1/16, thus making them much quicker (but naturally more frequent).
    Cleanups are coordinated between ccache processes so that at most
    one process will perform cleanup at a time. Also, the actual cache
    size will stay very close to the configured maximum size instead of
    staying around 90% as was the case before.
  * Added support for setting per-compilation configuration options on
    the command line. Example: `ccache hash_dir=false gcc -c example.c`
  * Made it possible to disable ccache for a certain source code file
    by embedding the string `ccache:disable` in a comment near the top
    of the file.
  * Made ccache understand that an MSVC `/Z7` option overrides an
    earlier `/Z*` option and thus is not too hard to cache.
  * Added a `--recompress-threads` command line option for selecting
    the number of CPU threads to use when recompressing the local cache.
  * Added `--trim-recompress` and `--trim-recompress-threads` command
    line options for recompressing file-based remote storage.
  * Added tmpfs, ufs and zfs to the list of supported filesystems on
    macOS and BSDs for the inode cache.
  * Improved progress bars for clean/clear/evict-style operations.
  * Improved printing of cache sizes in various outputs.
  * Activate debug logging for command mode options like `--cleanup`.
  * Added support for `-Wp,-U<macro>` in the direct mode.
  * Added quotes around arguments with space in logged command lines.
  * Added logging of executed command lines on Windows. +
  * Made sure not to update the stats file when there are no incremented
    counters.
  * Improved actual disk size calculation on Windows.

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