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Re: Some strict aliasing related fun

From: Brian Dessent <brian at dessent dot net>
To: Raymond Sheh <rsheh at cse dot unsw dot edu dot au>
Cc: gcc-help at gcc dot gnu dot org
Date: Wed, 28 Nov 2007 01:24:16 -0800
Subject: Re: Some strict aliasing related fun
References: <474CCDC9.4000604@cse.unsw.edu.au> <2e393d080711271926oe852c9cx5b943acdbc097f65@mail.gmail.com> <474CF5F1.5040409@cse.unsw.edu.au> <2e393d080711272130o46f886d3rf444179ae0074a95@mail.gmail.com> <474D02AB.9070600@cse.unsw.edu.au>
Reply-to: gcc-help at gcc dot gnu dot org

Raymond Sheh wrote:

> (and indeed, in one of the cases, if I manually put all
> the optimisation flags mentioned in the manpage for -O1 and -O2 onto the
> compile line it doesn't actually break!).

Specifying -fsome-optimization without an n >= 0 level of -On is a
no-op.  In other words, optimization must be enabled in order to do any
optimization.

Brian

Follow-Ups:
- Re: Some strict aliasing related fun
  - From: Raymond Sheh

References:
- Some strict aliasing related fun
  - From: Raymond Sheh
- Re: Some strict aliasing related fun
  - From: corey taylor
- Re: Some strict aliasing related fun
  - From: Raymond Sheh
- Re: Some strict aliasing related fun
  - From: corey taylor
- Re: Some strict aliasing related fun
  - From: Raymond Sheh

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