On 2020-06-01 19:11, Michael Jones wrote: > > > On Mon, Jun 1, 2020 at 10:33 AM Roman Yeryomin <ro...@advem.lv > <mailto:ro...@advem.lv>> wrote: > > Set CCACHE_DIR to $(TOPDIR)/.ccache and CCACHE_BASEDIR to $(TOPDIR). > This allows to do clean and dirclean. Cache hit rate for test build > after dirclean is ~65%. > If CCACHE is enabled stats are printed out at the end of building > process. > > Signed-off-by: Roman Yeryomin <ro...@advem.lv <mailto:ro...@advem.lv>> > > > This certainly looks like an improvement. > > However, there is an important usage case that this change doesn't address. > > Frequently when I am working on OpenWRT related things, I have many > different workspaces all tied to the same git repository hosted > externally. The reason for this is to allow multiple builds to live and > run independently. > > Having the CCACHE_DIR be located *inside* the repository doesn't share > the cache between multiple workspaces. > > So can the CCACHE_DIR be made configurable at build time based on the > .config file? Perhaps it can default to this, and only be set to the > value in .config if provided? For my purposes, I would always set the > CCACHE_DIR to a path that all of my workspaces use. I don't think there's a need for that config option. You could simply add a .ccache symlink in your source dir and point it to your shared cache. I do the same with dl on my trees.
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