Log Message:
ccache: updated to 4.9

Ccache 4.9

New features and improvements

Made ignore_options/CCACHE_IGNOREOPTIONS also skip the option from special \ 
processing, similar to how --ccache-skip works.
Added support for expanding environment variables references in all \ 
configuration options.
MSVC options /Fd, /FS and /MP are no longer included in the input hash.
Made ccache terminate an ongoing compiler subprocess when terminated on all \ 
platforms, not only on Unix.
Added support for multiple -Xarch_* arguments matching -arch.
Added a debug_level/CCACHE_DEBUGLEVEL configuration option, making it possible \ 
to tell ccache to only write a log file for each compilation, not other debug \ 
files.
Added max_cache_size_kibibyte and max_files_in_cache fields in output from \ 
ccache --print-stats.
Paths after -Xclang -include are now rewritten to relative paths if \ 
base_dir/CCACHE_BASEDIR is in effect.
Added support for clang --analyze.
Improved processing of input file arguments.
Added support for st_Xtimensec fields in struct stat, thus improving behavior on \ 
some BSDs when using newly created include files.
Added support for the undocumented GCC/Clang option --include.

Bug fixes

Ccache now exits more gracefully on invalid sharded remote storage URLs.
Made ccache bail out on too hard options -fmodules-ts, -fmodule-header, -wrapper \ 
and -Xclang -ast-dump.
Stopped relying on the st_blocks field in struct stat since it cannot be trusted \ 
for filesystems such as ZFS that do transparent compression or deduplication and \ 
adjust st_blocks some time in the future.
Fixed crash on Windows for paths with only a drive letter.
Made handling of Clang config options (such as --config-system-dir) more robust.
Fixed compiler type detection when compiler is a symlink called “clang-cl”.
Made sure to use MSVC logic for clang-cl when handling a precompiled header.
Generalized expansion of remote storage URLs with sharding, for instance making \ 
it possible to shard on port number.

Build improvements

Upgraded to xxHash 0.8.2, thereby fixing an error when compiling ccache with -Og.
Fixed sign-compare warning in src/InodeCache.cpp on FreeBSD.
Fixed the CMake option STATIC_LINK on Linux/macOS.
Added the CMake option OFFLINE, defaulting to the value of the standard variable \ 
FETCHCONTENT_FULLY_DISCONNECTED (which is OFF by default), to disable \ 
downloading anything from the internet.
Fixed warnings about unused functions on new MSVC versions.
Made sure to set both C and C++ CMake compiler launcher variables if either is set.

Documentation improvements

The manual now mentions that system_headers sloppiness is not supported for MSVC.

Test improvements

Fixed regex in direct.bash.