No caching if build-path contains unicode characters

[spechenin]

All files and libraries are recompiled each time for me.

OS Windows
Temporary directory is in C:\Users\USER\AppData\Local\Temp
In my case the USER part contains unicode characters.
Environment variable is set to short path, TEMP=C:\Users\328E~1\AppData\Local\Temp

The trouble comes from gcc .d files with non-utf-8 encoding.
So every reference in .d file cannot be found and the rebuild process starts.