So I've searched through the boards and seen a few posts on this, but nothing official. Is there any ruling for whether multiclass characters get fractional BAB or not. For an extreme example consider the following character.
Alchemist 1 / Bard 1 / Cleric 1 / Druid 1 / Inquisitor 1 / Monk 1 / Oracle 1 / Rogue 1 / Sorceror 1 / Summoner 1 / Witch 1 / Wizard 1
Since none of these classes have a +1 BAB progression this would be a 12th level character with a BAB of 0. Using fractional bonuses you would add up all the levels that get 1/2 progression (3 * 1/2 = 1 1/2 BAB) and all the levels that get 3/4 progression (9 * 3/4 = 6 3/4), then either add those two and round down (6 3/4 + 1 1/2 = 8 1/4) for a BAB of 8, or, for simplicity's sake, round them down first and add for a slightly lower bonus of 1 + 6 = 7.
This is also an issue with saves, but I think it's less of an issue there than it is with BAB.
Could we please get an official ruling on this?