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<== Date ==> <== Thread ==>

Subject: FW: Problems with 64-bit EDM
From: <will.rogers@diamond.ac.uk>
To: <tech-talk@aps.anl.gov>
Date: Mon, 29 Jul 2013 08:27:57 +0000
Hello all,

I am new to EPICS and EDM, so please bear with me.

We have compiled EDM using a 64-bit compiler, and we find some segfaults: apparently only when we close a window containing an xyGraph.  We've tracked the cause down to xygraph.cc where there are various casts to longs (for example):

          case ProcessVariable::specificType::integer:
            if (  xyo->ySigned[i] ) {
              dyValue = (double) ( (long *) xyo->yPvData[i] )[n];
            }
            else {
              dyValue = (double) ( (long *) xyo->yPvData[i] )[n];
            }

Since (apparently) EPICS integers are actually 32 bits, is this correct?  In practice, if I change all the casts to ints, I get no more segfaults.  I find that these casts were actually changed from ints in 1-12-41, with the comment 'fix for 64 bit systems, thanks to Sebastian Marsching'.

Can anyone shed any light on this?

Thanks,
Will Rogers

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