[gmx-users] gromacs on IBM Power 5 Linux Machine: Preprocessor problem

Mark Abraham Mark.Abraham at anu.edu.au
Thu Jun 14 12:19:23 CEST 2007

Monika Sharma wrote:
> Dear All,
> We have this IBM POWER5 machine with Linux SLES. The FFTW and GROMACS
> are compiling without any errors (compiler is gcc), but when we are
> trying to run a job on the machine, its exiting saying "illegal
> instruction". Looking at the things, it seemed that the cpp it generated
> is just a dummy, and cannot execute.

cpp is not generated by the above process. It needs to be already 
present on your machine.

You'd also be well advised to tell us *which* gromacs program you're 
trying to run when you get your "illegal instruction", because we can't 
read minds.

> I even tried using as
> make CFLAGS='-mcpu=power5  -mtune=power5' for fftw and gromacs also, but
> it doesnt seems to work.


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