[Beowulf] Re: static pvm library won't link anymore

David Mathog mathog at caltech.edu
Mon Jul 9 18:34:36 EDT 2007


> Turns out that the difficulties getting pvm to run were not just
> pvm problems.  There is a bizarre problem where every program, even
> "Hello World" built on Mandriva 2007.1 (gcc 4.1.2,2.6.17-14mdv) 
> will not run on Mandriva 2007.0 (gcc 4.1.1, 2.6.19.3).

Google with strings from the back trace messages showed
that this was a known issue. New distributions such as Mandriva
2007.1 and FC7 default to a  new linker mode:

  --hash-style=gnu

Unfortunately ld in older distros has no clue what this is
and treats the binary as if it had the older

  --hash-style=sysv

resulting in "floating point exception" (which is a bit of a
red herring in terms of figuring out why the program won't run)
and a core dump.  The newer version of ld still knows
about the older hash-style, so old binaries work on the newer
systems. 

To build a binary on the newer system that can run on the
older one use either:

 gcc -g  -o hello -Wl,--hash-style=sysv hello.c

or

 gcc -g  -o hello -Wl,--hash-style=both hello.c

Or upgrade every machine in your cluster to a "newer" release.  In the
long run, this might be the easiest choice.

Regards,

David Mathog
mathog at caltech.edu
Manager, Sequence Analysis Facility, Biology Division, Caltech
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