Log Message:
Changes 3.2.2:

New features and improvements
* Added support for CCACHE_COMPILERCHECK=string:<value>. This is a faster \ 
alternative to CCACHE_COMPILERCHECK=<command> if the command’s output \ 
can be precalculated by the build system.
* Add support for caching code coverage results (compiling for gcov).

Bug fixes
* Fixed bug which could result in false cache hits when source code contains \ 
'"' followed by " /*" or " //" (with variations).
* Made hash of cached result created with and without CCACHE_CPP2 different. \ 
This makes it possible to rebuild with CCACHE_CPP2 set without having to clear \ 
the cache to get new results.
* Don’t try to reset a non-existing stats file. This avoids “No such \ 
file or directory” messages in the ccache log when the cache directory \ 
doesn’t exist.
* Fixed a bug where ccache deleted clang diagnostics after compiler failures.
* Avoid performing an unnecessary copy of the object file on a cache miss.
* Bail out on too hard compiler option -fmodules.
* Bail out on too hard compiler option -fplugin=libcc1plugin (interaction with GDB).
* Fixed build error when compiling ccache with recent clang versions.
* Removed signal-unsafe code from signal handler.
* Corrected logic for when to output cached stderr.
* Wipe the whole cached result on failure retrieving a cached file.
* Fixed build error when compiling ccache with recent clang versions.