On Aug 13, 2004, at 2:38 PM, Marc Colosimo wrote:
>>> ldflags := -dynamiclibe -single_module \
>>> -L/usr/local/lib -L/usr/local/lib/lam
>>>
>>> ldlibs := -lmpi -llam_totalview
>>
>> Yikes -- this doesn't seem right.
>>
>> What are you using as your compiler -- are you using mpicc? If you
>> use mpicc, all the "right" flags will be added automatically.
>> Specifically, the -L's and -l's that you need will be added --
>> there's not even a need to add "-lmpi".
>>
>> You can run "mpicc -showme" to show you the Right flags.
>
> % mpicc -showme
> gcc -I/usr/local/include -D_REENTRANT -u
> _lam_darwin_malloc_linker_hack -Wl,-multiply_defined,suppress
> -force_flat_namespace -flat_namespace -Wl,-multiply_defined
> -Wl,suppress -L/usr/local/lib -llammpio -lmpi -llam -ldl
This should be all you need to compile LAM/MPI programs.
>> Specifically -- you should *NOT* be linking to the totalview library.
>> That is a separate shared library that is only loaded by the
>> totalview compiler (it is not linked into MPI executables).
>
> I had to include lam_totalview to get rid of some error (probably
> missing symbols). My ldflags and ldlibs for linux didn't include that
> stuff, but I didn't need to make a dynamic library (it was static).
Can you compile and link a simple "hello world" MPI program with just
mpicc?
#include <stdio.h>
#include <mpi.h>
int main(int argc, char **argv)
{
int i, rank = 0, size = 0;
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
printf("Hello, world! I am %d of %d\n", rank, size);
MPI_Finalize();
return 0;
}
> After removing the two libraries I still am getting the following for
> -bundle:
> ld: Undefined symbols:
> _environ
>
> And for -dynamic I get:
> ld: Undefined symbols:
> _main
I'm afraid I'm not familiar with -bundle or -dynamic. On the OS X gcc
man page, it says "see ld(1) for more information" about -bundle, but
nothing is listed. Similarly, "-dynamic" says that more information is
available on the dynamic linker page, but I didn't see anything about
it on ld(1).
Do you need these flags? What do they do?
--
{+} Jeff Squyres
{+} jsquyres_at_[hidden]
{+} http://www.lam-mpi.org/
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