Generated (precompiled) function names changing

[Magnus Holmgren, Millnet/Lysator/Debian/Mensa @ Pike developers forum]

I think I figured out that precompile.pike takes a --base parameter,
common_module_makefile.in uses it with $(MODNAME) as the value, and
it's been this way for ages. In the source release tarballs, all files
have the same timestamp, and what seems to have happened is that
suddenly, make remakes targets with the same timestamp as their
prerequisites. Or maybe one of the $(PMOD_TARGETS) somehow are older.
The question now is why there seem to be several files in the source
distribution generated with precompile.pike *without* --base.