I can fix it myself if you let me (and check/fix your maintained packages if you want):
To use ccache with **non-Portage** C compiling, add
/usr/lib64/ccache/bin to the beginning of your path, before /usr/bin.
Portage 2.0.46-r11+ will automatically take advantage of ccache with
no additional steps.
-> Could use readme.gentoo.eclass to show it first time and have it in README.gentoo file under /usr/share/doc
If this is your first install of ccache, type
something like this to set a maximum cache size of 2GB:
# ccache -M 2G
-> This should be shown only first time (as the message says)
If you are upgrading from an older version than 3.x you should clear
all of your caches like so:
# CCACHE_DIR='/var/tmp/ccache' ccache -C
-> This should be shown when updating from that older versions
should be all set now in the tree; thanks for the report!
Commit message: Only show ccache messages on first emerge