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Re: <bits/features.h> setting of __STDC_IEC_559__ not universallyaccurate

From: Ulrich Drepper <drepper at redhat dot com>
To: Mark Mitchell <mark at codesourcery dot com>
Cc: libc-alpha at sources dot redhat dot com, joseph at codesourcery dot com
Date: Mon, 28 Mar 2005 16:27:15 -0800
Subject: Re: <bits/features.h> setting of __STDC_IEC_559__ not universallyaccurate
Organization: Red Hat, Inc.
References: <42489BD2.5040407@codesourcery.com>

Mark Mitchell wrote:

At present, <bits/features.h> unconditionally sets __STDC_IEC_559__ to
1.  This is not accurate on (at least) ARM platforms using software
floating-point.  On those platforms, <fenv.h> does not define
FE_INEXACT, and friends, because the software floating-point emulation
provided by libgcc does not honor those rounding modes.  According to
the C99 standard, that would seem to preclude setting __STDC_IEC_559__.


The interface glibc provides requires this.  If the broken arm runtime
cannot handle it, fix it.

--
â Ulrich Drepper â Red Hat, Inc. â 444 Castro St â Mountain View, CA â

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Follow-Ups:
- Re: <bits/features.h> setting of __STDC_IEC_559__ not universallyaccurate
  - From: Mark Mitchell

References:
- <bits/features.h> setting of __STDC_IEC_559__ not universally accurate
  - From: Mark Mitchell

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