a new environment variable CCACHE_HASHCC whose value may be used to
override the compiler-specific addition to the hash value used to
distinguish between two compiles. This is useful where the compiler is
a shell script generated on-the-fly that executes the real compiler.
This allows ccache to function correctly within the pkgsrc
infrastructure.
However changes since 2.1.1 include:
# added a test suite
# better integration with distcc
# added CCACHE_PREFIX option
# disabled hard links by default
# recognise some more gcc options (eg. profiling)
# added --ccache-skip option