Log Message:
ccache: updated to 3.4.1

ccache 3.4.1
Bug fixes
Fixed printing of version number in ccache --version.

ccache 3.4
New features and enhancements
The compiler option form --sysroot arg is now handled like the documented \ 
--sysroot=arg form.
Added support for caching .su files generated by GCC flag -fstack-usage.
ccache should now work with distcc’s “pump” wrapper.
The optional unifier is no longer disabled when the direct mode is enabled.
Added support for nvcc compiler options --compiler-bindir/-ccbin, \ 
--output-directory/-odir and --libdevice-directory/-ldir.
Boolean environment variable settings no longer accept the following \ 
(case-insensitive) values: 0, false, disable and no. All other values are \ 
accepted and taken to mean “true”. This is to stop users from setting e.g. \ 
CCACHE_DISABLE=0 and then expect the cache to be used.
Improved support for run_second_cpp = false: If combined with passing \ 
-fdirectives-only (GCC) or frewrite-includes (Clang) to the compiler, \ 
diagnostics warnings and similar will be correct.
An implicit -MQ is now passed to the preprocessor only if the object file \ 
extension is non-standard. This should make it easier to use EDG-based compilers \ 
(e.g. GHS) which don’t understand -MQ.
ccache now treats an unreadable configuration file just like a missing \ 
configuration file.
Documented more pitfalls with enabling hard_links (CCACHE_HARDLINK).
Documented caveats related to colored warnings from compilers.

Bug fixes
File size and number counters are now updated correctly when files are \ 
overwritten in the cache, e.g. when using CCACHE_RECACHE.
run_second_cpp is now forced for nvcc.
Fixed how the nvcc options -optf and -odir are handled.