gistfile1.txt

# Am I naive for thinking logs 2 through 10 should be approximately the same?
# Why does touching a single file have completely non-deterministic results?
# (I won't ask why everything has to be recompiled most of the time because a
# timestamp was updated.)

% for i in {1..10}; do touch src/compiler/scala/reflect/internal/Printers.scala && sbt --debug package &> log-$i.txt; done
% grep -i recompiling *.txt
log-1.txt:[debug] Recompiling all 1 sources: invalidated sources (1) exceeded 50.0% of all sources
log-1.txt:[debug] Recompiling all 77 sources: invalidated sources (77) exceeded 50.0% of all sources
log-1.txt:[debug] Recompiling all 450 sources: invalidated sources (450) exceeded 50.0% of all sources
log-1.txt:[debug] Recompiling all 48 sources: invalidated sources (48) exceeded 50.0% of all sources
log-2.txt:[debug] Recompiling all 450 sources: invalidated sources (450) exceeded 50.0% of all sources
log-2.txt:[debug] Recompiling all 48 sources: invalidated sources (48) exceeded 50.0% of all sources
log-3.txt:[debug] Recompiling all 450 sources: invalidated sources (417) exceeded 50.0% of all sources
log-4.txt:[debug] Recompiling all 48 sources: invalidated sources (48) exceeded 50.0% of all sources
log-5.txt:[debug] Recompiling all 48 sources: invalidated sources (48) exceeded 50.0% of all sources
log-6.txt:[debug] Recompiling all 48 sources: invalidated sources (48) exceeded 50.0% of all sources
log-7.txt:[debug] Recompiling all 48 sources: invalidated sources (48) exceeded 50.0% of all sources
log-8.txt:[debug] Recompiling all 48 sources: invalidated sources (48) exceeded 50.0% of all sources
log-9.txt:[debug] Recompiling all 48 sources: invalidated sources (48) exceeded 50.0% of all sources
log-10.txt:[debug] Recompiling all 48 sources: invalidated sources (48) exceeded 50.0% of all sources

@paulp, any news on this?