- update to ccache-3.1.8
- Made paths to dependency files relative in order to increase
cache hits.
- Added work-around to make ccache work with buggy GCC 4.1 when
creating a pre-compiled header.
- Clang plugins are now hashed to catch plugin upgrades.
- Fixed crash when the current working directory has been
removed.
- Fixed crash when stderr is closed.
- Corrected a corner case when parsing backslash escapes in
string literals.
- Paths are now correctly canonicalized when computing paths
relative to the base directory.
- Made git version macro work when compiling outside of the
source directory.
- Fixed `static_assert` macro definition clash with GCC 4.7.