"Unaligned access" on Dec Alpha's OSF1

[Juergen Heinzl]

In article < 7tc704$ci0$1@nnrp1.deja.com >, Dietmar Koop wrote:
>we are porting our software to DEC Alpha's OSF1, using
>the gcc.
>Running the compiled program, we
>are getting some warning messages about "unaligned access".
>We guess that the reason are 64-bit problems.
>
>Here's the message:
>Unaligned access pid=3643 <programm_name> va=0x1401aa061
>pc=0x3ff80680e38 ra=0x3ff803ea318 inst=0xa0a30008
>
>Here the versions of gcc, gdb and OSF1:
>gcc -v:		gcc version 2.95 19990728 (release)
>gdb -v:		GDB 4.16
>uname -a:	OSF1 lempel V4.0 1091 alpha
>
>Using the gdb we can see that the pc points to a
>Motif function: XmCreateFormDialog
>
>Our software runs without problems under the following
>32-bit platforms:
>	- HP-UX 10.20, compiled with gcc 2.8.1
>	- Linux, gcc version egcs-2.91.66 19990314 (egcs-1.1.2 release)
>	- Solaris 2.6, gcc 2.8.1
>	- Siemens Sinix 5.43 (Reliant Unix), cc
>
>
>We have the following questions:
>(1) Does anyone know what we can do to avoid unaligned access ?

You can switch the warning off. See the FAQ for this system ...
http://www.ugu.com/sui/ugu/show?I=dunix.faq&F=1111111111&G=Y
... and yes, there is a but and it is not the best solution.

>(2) Is there any compiler switch of the gcc/egcs to handle this problem?
>    (the compiler from DEC has the option "-taso")
Not that I know off but I've yet to install gcc on our DEC.

Ta',
Juergen

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