The optional argument consists of whatever follows immediately within the same command-line token, provided that it does not begin with a hyphen or forward slash.

The argument is formally numeric. Values other than 32, 64 and 128 are coerced to 64, with a warning (D4014).


The /ZB option overrides earlier instances of itself (and is overridden by later instances). A first instance, /ZB with no number, is provided by CL as an initial option. Additionally, /ZB