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Re: determining 32 v. 64 bit compilatio

From: Bob Friesenhahn
Subject: Re: determining 32 v. 64 bit compilatio
Date: Tue, 29 Jun 2010 16:50:25 -0500 (CDT)
User-agent: Alpine 2.01 (GSO 1266 2009-07-14)

On Tue, 29 Jun 2010, Russ Allbery wrote:
I suspect that you're dealing with "all the world is Linux" code, and
therefore doing something like:

AS_IF([test "$ac_cv_sizeof_long" -eq 8],
   [AC_DEFINE([OSBIT], 64, [Define to the size of a long in bits.])],
   [AC_DEFINE([OSBIT], 32, [Define to the size of a long in bits.])])

would do what you want, but you won't find something exactly like that
built into Autoconf since it's not generally a meaningful thing to do on a
broader variety of platforms.

More specifically, this test would not be very useful for Microsoft Windows where the 'long' type is 32-bit in a 64-bit application.

There are also OSs which support various optional application models with various sizes for 'long' and pointers.

Bob Friesenhahn
GraphicsMagick Maintainer,

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