nocmodl : Verbatim block in DERIVATIVE block causes abort / assert failure about nrn HOT 5 CLOSED

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thanks Michael for detailed info!

Is this a bug? Could we update/fix this?

Yes and yes. Of course the VERBATIM contents have to make sense in the c code
which may involve several copies into different areas of the code.

I was just looking at StochKv.mod :

DERIVATIVE states {

    trates(v)

    n' = a - (a + b)*n
    .........
    P_a = strap(a*dt)
    P_b = strap(b*dt)

    : check that will represent probabilities when used
    ChkProb( P_a)
    ChkProb( P_b)
}

: ChkProb - Check that number represents a probability
PROCEDURE ChkProb(p) {
  if (p < 0.0 || p > 1.0) {
    VERBATIM
    fprintf(stderr, "StochKv.mod:ChkProb: argument not a probability.\n");
    ENDVERBATIM
  }
}

And after procedure inlining, nocmdol / mod2c_core wasn't able to translate it. Hence I was looking into the behaviour.

so it should suffice to replace

case STRING:
with
case STRING:
case VERBATIM:

in the void copy items

Yes, this is sufficient!

from nrn.

from nrn.

from nrn.

From another view, since output is not allowed for GPU, it may be good idea to think
about a standard way to raise an error and then when getting back to the cpu checking
the status and printing a message. or should we think in terms of buffering using
sprintf and then copy back to cpu and printing.

I don't think we should have buffering mechanism for copying error messages. Might be sufficient to set error code from kernel running on GPU / Accelerator (but may be we have to list all use cases ).

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