Re: DLMs & IRIX

[Nigel Wade <nmw(at)ion.le.ac.uk>]

"Robert S. Mallozzi" wrote:
> 
> Hi all,
> 
> Does anyone have any experience using DLMs under
> IRIX 6.5?  I have a DLM that works fine under Linux,
> but fails under IRIX.  I then tried the IDL example
> called "testmodule" that comes with the distribution,
> and it fails with the same error under IRIX - the
> DLM cannot be loaded:
> 
> % cd test
> % cp /usr/local/rsi/idl/external/dlm/* .
> % vi Makefile    <change IRIX to IRIX64>
> % make
> % idl
> 
> IDL> DLM_LOAD, 'testmodule'
> % DLM_LOAD: Error loading sharable executable.
>   Symbol: IDL_Load, File = /usr/people3/mallors/test/testmodule.so
>   1291373:/usr/local/rsi/idl_5.2/bin/bin.sgi/idl: rld: Fatal Error:
>   Cannot Successfully map soname
>   '/usr/people3/mallors/test/testmodule.so' under any of the
>   filenames /usr/people3/mallors/test/testmodule.so
> % Execution halted at:  $MAIN$
> IDL> exit
> %
> % file /usr/people3/mallors/test/testmodule.so
> /usr/people3/mallors/test/testmodule.so:
>     ELF N32 MSB mips-4 dynamic lib MIPS - version 1
> 
> I did have to change the testmodule Makefile a little
> since it looks for the system called "IRIX", and uname
> on my system is "IRIX64".   I tried setting the
> IDL_DLM_PATH environment variable as well (and even
> LD_LIBRARY_PATH), but no luck.
> 
> -bob

It's most likely the SGI ABI problem. 

IDL used to be a o32 binary, so any external code had to be built
using the -o32 compiler flag.  I cannot remember which version 
was the first to become N32, 5.1 was o32 and 5.2.1 is n32, but I 
don't know what 5.2 is.

You can check by the command :
file /usr/local/rsi/idl_5.2/bin/bin.sgi/idl

If is is listed as ELF 32-bit MSB then you need to build the DLMs
with the -o32 flag.

All I had to change to build the testmodule DLM was to change the
IRIX to IRIX64 in the Makefile. My default compiler options are
abi=n32:isa=mips3:proc=r4k and this worked with IDL 5.2.1.


-- 
-----------------------------------------------------------
Nigel Wade, System Administrator, Space Plasma Physics Group,
            University of Leicester, Leicester, LE1 7RH, UK 
E-mail :    nmw@ion.le.ac.uk 
Phone :     +44 (0)116 2523568, Fax : +44 (0)116 2523555