Brian / Ralf --

Is the attached patch what you're talking about?

If so, I'll commit to trunk, v1.2, and v1.3.


On Jul 21, 2008, at 7:08 PM, Brian W. Barrett wrote:

On Sun, 20 Jul 2008 21:13:48 +0200, Ralf Wildenhues
<ralf.wildenh...@gmx.de> wrote:
* Funda Wang wrote on Sun, Jul 20, 2008 at 05:29:57AM CEST:
I'm currently building openmpi 1.2.6 under Mandriva cooker, and its
default LDFLAGS is "-Wl,--as-needed -Wl,--no-undefined".

But openmpi 1.2.6 builds failed with:
libtool: link: g++ -shared -nostdlib
/usr/lib/gcc/i586-manbo-linux-gnu/4.3.1/../../../crti.o
/usr/lib/gcc/i586-manbo-linux-gnu/4.3.1/crtbeginS.o  .libs/mpicxx.o
.libs/intercepts.o .libs/comm.o .libs/datatype.o .libs/file.o
.libs/win.o   -lnsl -lutil -L/usr/lib/gcc/i586-manbo-linux-gnu/4.3.1
-L/usr/lib/gcc/i586-manbo-linux-gnu/4.3.1/../../.. -lstdc++ -lm
-lpthread -lc -lgcc_s
/usr/lib/gcc/i586-manbo-linux-gnu/4.3.1/crtendS.o
/usr/lib/gcc/i586-manbo-linux-gnu/4.3.1/../../../crtn.o  -march=i586
-mtune=generic -pthread -Wl,--no-undefined   -pthread -Wl,-soname
-Wl,libmpi_cxx.so.0 -o .libs/libmpi_cxx.so.0.0.0
.libs/mpicxx.o: In function `Errhandler':


/home/fwang/rpm/BUILD/openmpi-1.2.6/ompi/mpi/cxx/../../../ompi/mpi/ cxx/errhandler.h:30:
undefined reference to `ompi_mpi_errors_are_fatal'

I suppose ompi/mpi/cxx/Makefile.am is missing some libmpi_cxx_la_LIBADD
line.

Yeah, Ralf's correct -- Open MPI's missing the LIBADD fields to cause the C++, F77, and F90 bindings to not link against libmpi.so (which they depend
upon).

There's no good solution to this problem in Open MPI 1.2.6, other than to
not build with -Wl,--no-undefined.  The fix requires rebuilding the
Makefile, which is a little dicy from an Open MPI release tarball.
Hopefully, one of the current developers can patch this for upcoming
releases.  Unfortunately, most of the time, such a link isn't really
required, so this never came up before.  It does seem weird that a
distribution would enable that option by default, since many projects don't
properly handle the situation well.

Brian

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--
Jeff Squyres
Cisco Systems

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