I have on openembedded build dir
92G tmp
21G tmp-glibc
How to clean unneeded files? Old versions, abandoned targets, cache...
Is there any options to bitbake not to make copy of dependensies to each recipe?
I want delete all not needed for one selected task
You can just delete tmp whenever, as everything in there can be rebuilt if required. Using the rm_work class will delete the work directories of completed builds and actually only has a very small impact on build times, especially if you tune the mount parameters so the write cache timeout is more than a few seconds, as a recipe can often build and be deleted before it needs to even be written to disk.
sstate-cache is all cache, as the name suggests. There are tools such as sstate-cache-management to selectively prune, but the easier way is to just delete everything that hasn't been accessed for a while. This will delete everything that hasn't been accessed for two months:
$ find /path/to/sstate-cache -type f -atime +60 -delete