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Re: AC_CHECK_ALIGNOF maximum ??

From: Bob Friesenhahn
Subject: Re: AC_CHECK_ALIGNOF maximum ??
Date: Thu, 20 Jun 2013 09:19:01 -0500 (CDT)
User-agent: Alpine 2.01 (GSO 1266 2009-07-14)

On Thu, 20 Jun 2013, 'Chris Hall' wrote:

I hope I am in the right place, if not please direct me !

I have found:


which is quite lovely, as far as it goes... but it does not appear to
tell me the maximum possible alignment.

Of course gcc gives __BIGGEST_ALIGNMENT__ for this.  And I guess other
compilers do something similar...

...but I cannot help feeling that autoconf should cover this, but if
it does, I have failed to find where :-(

How would Autoconf portably test for this and for what purpose would you use this information for?

Compile-time estimation of biggest alignment seems risky to me if it is used for any serious purpose. If all of the software in the running application was not compiled with the same flags, then the compiled-in value may be wrong.

Bob Friesenhahn
GraphicsMagick Maintainer,

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