Re: AMBER: Compiling Amber 9 on SGI with gcc

From: Scott Brozell <>
Date: Fri, 8 Dec 2006 19:29:15 -0800


I am interested in this because I want to know why -m32 fails ?
Is it just a gcc version issue ???

On Fri, 8 Dec 2006, Shin, John Y CONTRACTOR WRAIR-Wash DC wrote:

> I'm trying to compile Amber 9 on an Octane 2 SGI machine running IRIX
> 6.5.25f using gcc 4.0.3, binutils 2.17, and g95 0.9. I use the
> following commands to compile:
> 1. ./configure g95
> 2. make serial
> It proceeds fine until the first instance that gcc is invoked, and the
> following occurs:
> gcc -c -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -02 -m32 -o
> mmtsb_client.o mmtsb_client.c
> cc1: error: invalid option '32'
> I read elsewhere in the mail archives that some people who had a similar
> problem were able to make Amber compile by deleting the "-m32" flag from
> config.h.

Yes, I found this
But nothing of interest to me in it.

For the record on an itanium with -m32 in the gcc man page, gcc -m32 failed:
gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-52)
Linux ipf-login1 2.4.21-sgi306rp21 #1 SMP Thu Oct 13 18:51:34 EDT 2005 ia64 ia64 ia64 GNU/Linux
Red Hat Enterprise Linux AS release 3 (Taroon Update 5)

> In my case, deleting the flag does allow compilation to
> proceed further, but it runs into another error down the road and gives
> the following message:
> ld32: FATAL 2 : Internal: at ../../ld/multigot.c lgot_local_got_offset()
> seg_ndx exceeds per_seg_lgot_table
> ld32: INFO 152: Output file removed because of error.

I only found this hit which does not offer an explaination:

> According to the GCC 4.0.3 manual it seems -m32 is a valid flag for some
> architectures, although I didn't see the SGI listed as one of them. If
> the flag is not valid for SGIs, what would be the SGI equivalent I need
> to use? Any help would be greatly appreciated!

Option wise -mabi=32 from the MIPS section of the gcc man page
will result in 32 bit ints, longs, and pointers.

Another approach is to remove all occurrences of
from the sander Makefile.
Since you did not configure with mmtsb, mmtsb_client.o does not have
anything useful in it.


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Received on Sun Dec 10 2006 - 06:07:09 PST
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