On Mon, Jun 1, 2020 at 1:22 PM Felix Fietkau <n...@nbd.name> wrote: > 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. > > - Felix >
I disagree. Having build behavior change based on a symlink is undesirable. If it were a config option, it becomes a documented feature that is easily discoverable in the menu config. Additionally, having the ccache directory be a configuration option allows it to persist across clones of the git repository, if the .config file is stored in git. A symlink would need to be manually re-configured on each clone.
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