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Re: test for restrict fails with MS compiler

From: Ralf Wildenhues
Subject: Re: test for restrict fails with MS compiler
Date: Sun, 22 Jul 2007 10:31:07 +0200
User-agent: Mutt/1.5.13 (2006-08-11)

Hello Jerker,

* Jerker Bäck wrote on Fri, Jul 20, 2007 at 03:36:32PM CEST:
> Well, maybe you're right. I will be using the MS implementation of restrict
> and see if I run into problems. There could be a risk of wrong optimization
> - we'll see.

I would doubt that MSVC does wrong optimizations wrt. restrict.
At least I haven't heard about it before (and none of my previous
arguments dealt with this topic).

> The autoconf mmap test fails. The reason for this is complicated and hard to
> explain, but is due to the tests requirement for fixed memory (MAP_FIXED).

If your program does not make use of mmap(MAP_FIXED), then I assume
that you could get away with AC_CHECK_FUNC([mmap]) rather than using
AC_FUNC_MMAP.  See the manual on details of this macro.

> In short: It violates the whole idea with the NT kernel Virtual Memory
> Manager. You know, there are no real memory in Windows, only virtual.

There is no real memory in most if not all unix-like systems, either.
But this does not have much to do with the above, so never mind.


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