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Compiling mex-file under 64bit-linux
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Friedrich Gottelt  
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 More options Mar 2 2007, 3:43 am
Newsgroups: comp.soft-sys.matlab
From: "Friedrich Gottelt" <friedrich.gott...@uni-rostock.de>
Date: Fri, 2 Mar 2007 03:43:16 -0500
Local: Fri, Mar 2 2007 3:43 am
Subject: Compiling mex-file under 64bit-linux
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I want to use some Fortran-Code from Matlab using a Mex-file. This
worked well under linux 32bit. But when I changed to 64bit Linux
involving 64bit MAtlab, I get a segmentation fault when calling that
mex. The Compilation with mex is obviously completed withaout any
error and a *.mexa64 is created. It seems that the last action before
crashing is calling the matlab function mxgetM in the gateway
routine. Is there anything to regard when using this function under
64bit operating systems??
TThanks in advance, Friedrich

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Christopher Hulbert  
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 More options Mar 2 2007, 6:06 am
Newsgroups: comp.soft-sys.matlab
From: Christopher Hulbert <cchgroupm...@gmail.com>
Date: Fri, 2 Mar 2007 06:06:24 -0500
Local: Fri, Mar 2 2007 6:06 am
Subject: Re: Compiling mex-file under 64bit-linux
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Friedrich Gottelt wrote:
> I want to use some Fortran-Code from Matlab using a Mex-file. This
> worked well under linux 32bit. But when I changed to 64bit Linux
> involving 64bit MAtlab, I get a segmentation fault when calling that
> mex. The Compilation with mex is obviously completed withaout any
> error and a *.mexa64 is created. It seems that the last action before
> crashing is calling the matlab function mxgetM in the gateway
> routine. Is there anything to regard when using this function under
> 64bit operating systems??
> TThanks in advance, Friedrich

The most common cause of this is a mismatch in pointer size. All pointers need
to be 8 bytes for 64-bit linux compared to the 4 bytes for 32-bit linux.

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Friedrich Gottelt  
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 More options Mar 2 2007, 7:11 am
Newsgroups: comp.soft-sys.matlab
From: "Friedrich Gottelt" <friedrich.gott...@uni-rostock.de>
Date: Fri, 2 Mar 2007 07:11:51 -0500
Local: Fri, Mar 2 2007 7:11 am
Subject: Re: Compiling mex-file under 64bit-linux
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dear Christopher, thanks for your quick reply! changing the size of
the pointers was the solution!!


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