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Option:
    Description:

oa
    relax aliasing constraints (see oa)

ob
    enable branch prediction (see ob)

oc
    disable <call followed by return> to <jump> optimization (see oc)

od
    disable all optimizations (see od)

oe[=<num>]
    expand user functions in-line.  <num> controls max size (see oe=<num>)

oh
    enable repeated optimizations (longer compiles) (see oh)

oi
    expand intrinsic functions in-line (see oi)

oi+
    (C++ only) expand intrinsic functions in-line and set inline_depth to
    maximum (see oi+)

ok
    enable control flow prologues and epilogues (see ok)

ol
    enable loop optimizations (see ol)

ol+
    enable loop optimizations with loop unrolling (see ol+)

om
    generate in-line 80x87 code for math functions (see om)

on
    allow numerically unstable optimizations (see on)

oo
    continue compilation if low on memory (see oo)

op
    generate consistent floating-point results (see op)

or
    reorder instructions for best pipeline usage (see or)

os
    favor code size over execution time in optimizations (see os)

ot
    favor execution time over code size in optimizations (see ot)

ou
    all functions must have unique addresses (see ou)

ox
    equivalent to -obiklmr -s (see ox)

oz
    NULL points to valid memory in the target environment (see oz)