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Re: chebfun gives Illegal instruction: 4

From: José Abílio Matos
Subject: Re: chebfun gives Illegal instruction: 4
Date: Tue, 21 May 2019 10:18:30 +0100

On Sunday, 19 May 2019 08.32.12 WEST Andrew Janke wrote:
> This was from a Homebrew-installed
> `octave-app/octave-app/octave-default` on 2019-05-19 at 03:30 Eastern.
> Cheers,
> Andrew

For further comparison I am running octave in place (no installation). I get 
(in Fedora 30)

$ ./run-octave -q
octave:1> addpath ~/tmp/chebfun/chebfun-master
octave:2> x = chebfun('x')
error: octave_base_value::bool_value(): wrong type argument 'sq_string'
error: called from
    chebfun at line 219 column 36
octave:2> ver
GNU Octave Version: 6.0.0 (hg id: 5fa8d1459b35)
GNU Octave License: GNU General Public License
Operating System: Linux 5.1.2-300.fc30.x86_64 #1 SMP Tue May 14 23:58:18 UTC 
2019 x86_64
Package Name  | Version | Installation directory
       optim  |   1.6.0 | /home/jamatos/.local/share/octave/optim-1.6.0
    symbolic  |   2.7.1 | /home/jamatos/.local/share/octave/symbolic-2.7.1

If I try to get the backtrace it fails right when entering the line

[f.funs, f.domain] = chebfun.constructor(op, dom, data, pref);

Using "Step in" when debugging gives the above error message. it does not even 
enter the function.

For reference I am using gcc 9.1.1

José Matos

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