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Subject: Re: [OMPI users] Fwd: Cross compiling for 32 bit from a 64 bit machine
From: saahil.in_at_[hidden]
Date: 2010-10-25 15:15:28


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

On Oct 26, 2010 12:15am, Ralph Castain <rhc_at_[hidden]> 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.in_at_[hidden] wrote:

> > I also tried by adding

> >

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

> >

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

> >

> > On Oct 25, 2010 11:59pm, saahil.in_at_[hidden] 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 rhc_at_[hidden]> 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.in_at_[hidden] wrote:

> > > >

> > > >

> > > >

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

> > > >

> > > > > From: saahil.in_at_[hidden]

> > > >

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

> > > >

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

> > > >

> > > > > To: users_at_[hidden]

> > > >

> > > > > 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_______________________________________________

> > > >

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> > > >

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> > > >

> > > >

> > > >

> > > >

> > > >

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> > > >

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