The FAQ says:
It is sometimes asked if there is any way to get a copy of exactly
the code used to build a snapshot. The answer is no.
For this to change, it would be sufficient if the output of
find src XF4 -path '*/CVS/Entries' -exec perl -ne \
'm:^(/[^/]*/[^/]*): && print substr($ARGV,0,-12),"$1\n"' '{}' ';'
(or equivalent information) accompanies the snapshot.
That would not work. Often snapshots contain uncommited diffs as well.
Another issue is that I will do cvs updates on the source trees while
doing builds on all the architectures in parallel. No kidding. And
yes, I am careful, and yes, even I sometimes make a few mistakes in
this process.
What you ask for will never happen. I've got more than enough to do.