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FE_* constants and ISO C99

To: Ulrich Drepper <drepper at redhat dot com>, "Joseph S. Myers" <jsm28 at cam dot ac dot uk>
Subject: FE_* constants and ISO C99
From: Jakub Jelinek <jakub at redhat dot com>
Date: Mon, 25 Jun 2001 12:40:41 +0200
Cc: Glibc hackers <libc-hacker at sources dot redhat dot com>
Reply-To: Jakub Jelinek <jakub at redhat dot com>

Hi!

ISO C99 states in 7.1.4.1:
All object-like macros listed as expanding to integer constant expressions
shall additionally be suitable for use in #if preprocessing directives.

I'm not entirely sure if this allows them to be defined as they sometimes
are in glibc headers, ie.
enum { 
  FE_INEXACT = 0x??
#define FE_INEXACT FE_INEXACT
};
, see http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=44520
because they can then be only used in #if preprocessing directives when
testing if they are defined, not to check their value (and I don't see why
ISO C99 would explicitely state it when all macros are suitable for use in
#ifdef resp #if defined() preprocessing directives).
Ideas?

	Jakub

Follow-Ups:
- Re: FE_* constants and ISO C99
  - From: Ulrich Drepper

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