Signal 291 compiler crash
lazarus / 65-FV-Textmode IDE

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Nitorami · 2016-02-03 18:52

I am having a serious issue with the compiler FPC 3.0.0 which
generates a signal 291 when I merely change the name of a variable in
an otherwise rather old and stable code. By setting compiler verbosity
to "all" I managed to locate the offending code line on which the
compiler throws its last message "Error: Expression type must be class
or record type, got (erroneous type)" before it dies. The correct
reaction should be "Identifier not found". 

Not a regression, it's the same with FPC 2.6.4.

Unfortunately I did not manage to reproduce the fault with an extract
of the code for inclusion in a bug report. It seems that the entire
program of at least a substantial part of it is required to cause the
crash. It is not a big program, maybe 1000 lines in total, but I doubt
whether throwing the entire code at the dev team will be useful.

Any advice how to proceed ?

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Nitorami · 2016-02-03 21:23

Could isolate it at last, it is related to optimisation loopunroll.
Not sure whether loopunroll is fully supported yet, anyway, this tiny
piece of code crashes the compiler. I will issue a bug report.

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
{$OPTIMIZATION LOOPUNROLL} procedure SendState;var n: longint;begin 
with Outputs[0] do begin    for n := 0 to pred(NumConns) do with
OList[n] do begin end;  end;end;