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Subject: [OMPI users] Cross compiling for 32 bit from a 64 bit machine
From: saahil.in_at_[hidden]
Date: 2010-10-25 13:56:36


Hello,
I am a beginner using Open MPI to set up a simple Beowulf cluster of PCs
for my Distributed Systems lab. My head node is my x86_64 architecture
Fedora 12 machine. The rest of my nodes are i386 Fedora 13 machines. I
understand that I need to compile Open MPI with CFLAGS=-m32 so that I can
use -m32 flag to create a 32 bit compatible binary. I could not do this
using yum install. So I am using the tarball for Open MPI 1.5.
my configure command is as follows -

./configure --prefix=/home/wolf/openmpi/ CFLAGS=-m32 CXXFLAGS=-m32
FFLAGS=-m32 FCFLAGS=-m32

This works fine. However, while doing make I get the following errors -

/usr/bin/ld: i386:x86-64 architecture of input file
`../opal/libltdl/.libs/libltdlc.a(libltdlc_la-preopen.o)' is incompatible
with i386 output
/usr/bin/ld: i386:x86-64 architecture of input file
`../opal/libltdl/.libs/libltdlc.a(libltdlc_la-lt__alloc.o)' is incompatible
with i386 output
/usr/bin/ld: i386:x86-64 architecture of input file
`../opal/libltdl/.libs/libltdlc.a(libltdlc_la-lt_dlloader.o)' is
incompatible with i386 output
/usr/bin/ld: i386:x86-64 architecture of input file
`../opal/libltdl/.libs/libltdlc.a(libltdlc_la-lt_error.o)' is incompatible
with i386 output
/usr/bin/ld: i386:x86-64 architecture of input file
`../opal/libltdl/.libs/libltdlc.a(libltdlc_la-ltdl.o)' is incompatible with
i386 output
/usr/bin/ld: i386:x86-64 architecture of input file
`../opal/libltdl/.libs/libltdlc.a(libltdlc_la-slist.o)' is incompatible
with i386 output
/usr/bin/ld: i386:x86-64 architecture of input file
`../opal/libltdl/.libs/libltdlc.a(lt__strl.o)' is incompatible with i386
output
/usr/bin/ld: i386:x86-64 architecture of input file
`../opal/libltdl/.libs/libltdlc.a(libltdlcS.o)' is incompatible with i386
output
/usr/bin/ld: i386:x86-64 architecture of input file
`../opal/libltdl/.libs/libltdlc.a(dlopen.o)' is incompatible with i386
output
/usr/bin/ld: i386:x86-64 architecture of input file
`asm/.libs/libasm.a(atomic-asm.o)' is incompatible with i386 output
/usr/bin/ld: i386:x86-64 architecture of input file
`event/.libs/libevent.a(signal.o)' is incompatible with i386 output
/usr/bin/ld: i386:x86-64 architecture of input file
`event/.libs/libevent.a(epoll.o)' is incompatible with i386 output
/usr/bin/ld: i386:x86-64 architecture of input file
`event/.libs/libevent.a(poll.o)' is incompatible with i386 output
/usr/bin/ld: i386:x86-64 architecture of input file
`event/.libs/libevent.a(select.o)' is incompatible with i386 output
/usr/bin/ld: final link failed: Invalid operation
collect2: ld returned 1 exit status
make[2]: *** [libopen-pal.la] Error 1
make[2]: Leaving directory `/home/wolf/Downloads/openmpi-1.5/opal'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/wolf/Downloads/openmpi-1.5/opal'
make: *** [all-recursive] Error 1

Any idea as to how to go around fixing this? Any help would be greatly
regarded, since I'm supposed to meet a deadline, and half of my semester
has been spent trying to get either LAM-MPI or Open MPI (which I was
suggested I shift to) to work.
Thank you very much.

Regards,
Saahil