# ffnalias, Ow

Determines whether aliasing is assumed within functions.

## Syntax

Linux: | -ffnalias -fno-fnalias

macOS: | -ffnalias -fno-fnalias

Windows: | /Ow /Ow-

## Arguments

None

## Default

-ffnalias or /Ow | Aliasing is assumed within functions.

## Description

This option determines whether aliasing is assumed within functions.

If you specify -fno-fnalias or /Ow-, aliasing is not assumed within functions, but it is assumed across calls.

If you specify -ffnalias or /Ow, aliasing is assumed within functions.

## IDE Equivalent

None

## Alternate Options

None

Parent topic: Optimization Options

## See Also

falias compiler option