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Re: detecting -ffast-math at compile time

From: Ian Lance Taylor <iant at google dot com>
To: Rohit Garg <rpg dot 314 at gmail dot com>
Cc: gcc-help at gcc dot gnu dot org
Date: Fri, 27 Mar 2009 09:18:30 -0700
Subject: Re: detecting -ffast-math at compile time
References: <4d5dd8c20903260615n25de2374n2661b6e111408dc9@mail.gmail.com>

Rohit Garg <rpg.314@gmail.com> writes:

> If I wish to detect if the compiler options include -ffast-math, which
> macro should I define? This is useful if I want to select which path
> of the code to compile depending on my needs with just a compiler
> switch. Eg. for SSE2, __SSE2__(or it's cousin) is defined.

Check for __FAST_MATH__.

The gcc manual documents this is in the description of -ffast-math.

Ian

References:
- detecting -ffast-math at compile time
  - From: Rohit Garg

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