- 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` 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.