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 the code - in your case, that would be i386-pc-linux-gnu





On Oct 25, 2010, at 12:30 PM, saahil...@gmail.com wrote:



> I also tried by adding

>

> --host=i686-pc-linux-gnu

>

> alongwith the --build option. Same error :(

>

> On Oct 25, 2010 11:59pm, saahil...@gmail.com wrote:

> > Ralph,

> > As you suggested, I configured with the following options -

> >

> > ./configure --prefix=/home/wolf/openmpi/ CFLAGS=-m32 CXXFLAGS=-m32 FFLAGS=-m32 FCFLAGS=-m32 --build=i686-pc-linux-gnu LDFLAGS=-m32

> >

> > I'm afraid I am still getting the same error messages while making as I did last time. Did I fail to understand what you said? Am I doing something wrong here?

> >

> > Regards,

> > Saahil

> >

> > On Oct 25, 2010 11:35pm, Ralph Castain r...@open-mpi.org> wrote:

> > > Do ./configure --help and you'll see options for specifying the host and build target. You need to do that when cross-compiling.

> > >

> > >

> > >

> > >

> > >

> > > On Oct 25, 2010, at 12:01 PM, saahil...@gmail.com wrote:

> > >

> > >

> > >

> > > > ---------- Forwarded message ----------

> > >

> > > > From: saahil...@gmail.com

> > >

> > > > Date: Oct 25, 2010 11:26pm

> > >

> > > > Subject: Cross compiling for 32 bit from a 64 bit machine

> > >

> > > > To: us...@open-mpi.org

> > >

> > > > CC:

> > >

> > > >

> > >

> > > >

> > >

> > > > > 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_______________________________________________

> > >

> > > > users mailing list

> > >

> > > > us...@open-mpi.org

> > >

> > > > http://www.open-mpi.org/mailman/listinfo.cgi/users

> > >

> > >

> > >

> > >

> > >

> > > _______________________________________________

> > >

> > > users mailing list

> > >

> > > us...@open-mpi.org

> > >

> > > http://www.open-mpi.org/mailman/listinfo.cgi/users

> > >_______________________________________________

> users mailing list

> us...@open-mpi.org

> http://www.open-mpi.org/mailman/listinfo.cgi/users





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