BBv1+2: Separate out common rules for OS?

From: jens_maurer (Jens.Maurer_at_[hidden])
Date: 2003-07-10 08:35:40

I've noticed that nearly all Unix-based toolkits have

# Declare action for creating static libraries
actions piecemeal archive 
{
ar ur "$(<)" "$(>)"
}

with sometimes "ur", sometimes "cr".
(We probably want "cur" to avoid a warning when the archive
is created.)

Do we want to factor this out?