ccache for MXE Octave cross builds

[Markus Mützel]

Out of curiosity: How did you set up your ccache configuration for the Windows 
cross-builds with MXE-Octave?
My settings are:
cat ~/.ccache/ccache.conf 
max_size = 30.0G
hash_dir = false

To me it looks like with these settings the compiler cache is only used for the 
"build-*" packages after a "make clean".
The later packages never seem to hit any cached files. Maybe because ccache 
detects that the freshly built compiler is different from the previous run?

Are there some settings or switches which allow the compiler cache to be used 
more efficiently?

Markus