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Subject: Re: [OMPI users] Cross compiling for 32 bit from a 64 bit machine
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2010-10-25 14:11:18


You might also need LDFLAGS=-m32 ...?

On Oct 25, 2010, at 1:56 PM, saahil.in_at_[hidden] wrote:

> 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_______________________________________________
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-- 
Jeff Squyres
jsquyres_at_[hidden]
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