Re: [OMPI devel] Help on building openmpi with "-Wl, --as-needed -Wl, --no-undefined"

[Jeff Squyres]

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'

line.

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

upon).


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

properly handle the situation well.

Brian

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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 There's no good solution to this problem in Open MPI 1.2.6, other than to distribution would enable that option by default, since many projects don't

--
Jeff Squyres
Cisco Systems

bindings-libtool.patch
Description: Binary data