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Re: #if vs. #ifdef -- again (was: AC_CHECK_SIZEOF failing on undefined H
From: |
Andreas Schwab |
Subject: |
Re: #if vs. #ifdef -- again (was: AC_CHECK_SIZEOF failing on undefined HAVE_STDINT_H with -Werror) |
Date: |
Tue, 15 Aug 2006 16:50:19 +0200 |
User-agent: |
Gnus/5.110006 (No Gnus v0.6) Emacs/22.0.50 (gnu/linux) |
nash <address@hidden> writes:
> Wouldn't it be preferrable to use #if so that a config.h token could
> be an expression that variously evaluates to T/F depending on other
> stuff? For example,
>
> In config.h somewhere:
> #define HAVE_WORKING_MMAP (defined(HAVE_MMAP) && defined(HAVE_MUNMAP))
This won't work anyway, the C standard does not define the behaviour of
defined in expanded tokens.
Andreas.
--
Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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"And now for something completely different."
Re: AC_CHECK_SIZEOF failing on undefined HAVE_STDINT_H with -Werror, Paul Eggert, 2006/08/15