Re: [OMPI users] Fwd: Cross compiling for 32 bit from a 64 bit machine

saahil . in Mon, 25 Oct 2010 15:19:41 -0400

Also, btw using these two values and make clean, I was able to bothconfigure and build Open MPI properly. After that I compiled an examplecode with -m32 flag and it compiled properly too :D. It remains to be seenwhether my setup of machines run them properly or not.


Regards,
Saahil


On Oct 26, 2010 12:45am, saahil...@gmail.com wrote:

Ralph, well my --host flag contains i686-pc-linux-gnu and so does --build.

On Oct 26, 2010 12:15am, Ralph Castain r...@open-mpi.org> wrote:
> The problem is that you set the build and the host to the -same-architecture - that indicates it isn'ta cross-compile situation. The--host flag should indicate the arch of the machines that will run thecode - in your case, that would be i386-pc-linux-gnu
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> On Oct 25, 2010, at 12:30 PM, saahil...@gmail.com wrote:
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> > I also tried by adding
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> > --host=i686-pc-linux-gnu
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> > alongwith the --build option. Same error :(
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> >
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> > On Oct 25, 2010 11:59pm, saahil...@gmail.com wrote:
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> > > Ralph,
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> > > As you suggested, I configured with the following options -
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> > >
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> > > ./configure --prefix=/home/wolf/openmpi/ CFLAGS=-m32 CXXFLAGS=-m32FFLAGS=-m32 FCFLAGS=-m32 --build=i686-pc-linux-gnu LDFLAGS=-m32
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> > >
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> > > I'm afraid I am still getting the same error messages while makingas I did last time. Did I fail to understand what you said? Am I doingsomething wrong here?
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> > >
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> > > Regards,
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> > > Saahil
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> > >
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> > > On Oct 25, 2010 11:35pm, Ralph Castain r...@open-mpi.org> wrote:
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> > > > Do ./configure --help and you'll see options for specifying thehost and build target. You need to do that when cross-compiling.
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> > > >
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> > > >
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> > > > On Oct 25, 2010, at 12:01 PM, saahil...@gmail.com wrote:
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> > > >
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> > > >
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> > > > > ---------- Forwarded message ----------
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> > > >
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> > > > > From: saahil...@gmail.com
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> > > >
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> > > > > Date: Oct 25, 2010 11:26pm
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> > > >
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> > > > > Subject: Cross compiling for 32 bit from a 64 bit machine
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> > > >
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> > > > > To: us...@open-mpi.org
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> > > >
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> > > > > CC:
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> > > >
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> > > > >
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> > > >
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> > > > >
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> > > >
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> > > > > > Hello,
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> > > >
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> > > > > > I am a beginner using Open MPI to set up a simple Beowulfcluster of PCs for my Distributed Systems lab. My head node is my x86_64architecture Fedora 12 machine. The rest of my nodes are i386 Fedora 13machines. I understand that I need to compile Open MPI with CFLAGS=-m32so that I can use -m32 flag to create a 32 bit compatible binary. I couldnot do this using yum install. So I am using the tarball for Open MPI 1.5.
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> > > >
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> > > > > > my configure command is as follows -
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> > > >
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> > > > > >
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> > > >
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> > > > > > ./configure --prefix=/home/wolf/openmpi/ CFLAGS=-m32CXXFLAGS=-m32 FFLAGS=-m32 FCFLAGS=-m32
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> > > >
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> > > > > >
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> > > >
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> > > > > > This works fine. However, while doing make I get thefollowing errors -
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> > > >
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> > > > > >
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> > > > > > /usr/bin/ld: i386:x86-64 architecture of input file`../opal/libltdl/.libs/libltdlc.a(libltdlc_la-preopen.o)' is incompatiblewith i386 output
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> > > >
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> > > > > > /usr/bin/ld: i386:x86-64 architecture of input file`../opal/libltdl/.libs/libltdlc.a(libltdlc_la-lt__alloc.o)' isincompatible with i386 output
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> > > >
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> > > > > > /usr/bin/ld: i386:x86-64 architecture of input file`../opal/libltdl/.libs/libltdlc.a(libltdlc_la-lt_dlloader.o)' isincompatible with i386 output
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> > > >
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> > > > > > /usr/bin/ld: i386:x86-64 architecture of input file`../opal/libltdl/.libs/libltdlc.a(libltdlc_la-lt_error.o)' isincompatible with i386 output
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> > > >
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> > > > > > /usr/bin/ld: i386:x86-64 architecture of input file`../opal/libltdl/.libs/libltdlc.a(libltdlc_la-ltdl.o)' is incompatiblewith i386 output
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> > > >
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> > > > > > /usr/bin/ld: i386:x86-64 architecture of input file`../opal/libltdl/.libs/libltdlc.a(libltdlc_la-slist.o)' is incompatiblewith i386 output
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> > > >
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> > > > > > /usr/bin/ld: i386:x86-64 architecture of input file`../opal/libltdl/.libs/libltdlc.a(lt__strl.o)' is incompatible with i386output
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> > > >
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> > > > > > /usr/bin/ld: i386:x86-64 architecture of input file`../opal/libltdl/.libs/libltdlc.a(libltdlcS.o)' is incompatible with i386output
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> > > >
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> > > > > > /usr/bin/ld: i386:x86-64 architecture of input file`../opal/libltdl/.libs/libltdlc.a(dlopen.o)' is incompatible with i386output
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> > > >
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> > > > > > /usr/bin/ld: i386:x86-64 architecture of input file`asm/.libs/libasm.a(atomic-asm.o)' is incompatible with i386 output
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> > > >
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> > > > > > /usr/bin/ld: i386:x86-64 architecture of input file`event/.libs/libevent.a(signal.o)' is incompatible with i386 output
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> > > >
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> > > > > > /usr/bin/ld: i386:x86-64 architecture of input file`event/.libs/libevent.a(epoll.o)' is incompatible with i386 output
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> > > >
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> > > > > > /usr/bin/ld: i386:x86-64 architecture of input file`event/.libs/libevent.a(poll.o)' is incompatible with i386 output
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> > > > > > /usr/bin/ld: i386:x86-64 architecture of input file`event/.libs/libevent.a(select.o)' is incompatible with i386 output
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> > > >
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> > > > > > /usr/bin/ld: final link failed: Invalid operation
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> > > >
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> > > > > > collect2: ld returned 1 exit status
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> > > >
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> > > > > > make[2]: *** [libopen-pal.la] Error 1
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> > > >
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> > > > > > make[2]: Leaving directory`/home/wolf/Downloads/openmpi-1.5/opal'
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> > > >
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> > > > > > make[1]: *** [all-recursive] Error 1
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> > > >
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> > > > > > make[1]: Leaving directory`/home/wolf/Downloads/openmpi-1.5/opal'
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> > > >
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> > > > > > make: *** [all-recursive] Error 1
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> > > >
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> > > > > >
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> > > >
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> > > > > >
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> > > >
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> > > > > > Any idea as to how to go around fixing this? Any help wouldbe greatly regarded, since I'm supposed to meet a deadline, and half ofmy semester has been spent trying to get either LAM-MPI or Open MPI(which I was suggested I shift to) to work.
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> > > >
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> > > > > > Thank you very much.
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> > > >
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> > > > > >
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> > > >
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> > > > > > Regards,
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> > > >
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> > > > > > Saahil_______________________________________________
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> > > >
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> > > >
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> > > > > us...@open-mpi.org
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> > > >
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> > > > > http://www.open-mpi.org/mailman/listinfo.cgi/users
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> > > >
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> > > >
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> > > >
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> > > >
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> > > >
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> > > > _______________________________________________
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> > > >
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> > > > users mailing list
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> > > >
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> > > > us...@open-mpi.org
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> > > >
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> > > > http://www.open-mpi.org/mailman/listinfo.cgi/users
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> > > >_______________________________________________
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Re: [OMPI users] Fwd: Cross compiling for 32 bit from a 64 bit machine

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