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Bill Allombert on Sun, 19 Feb 2023 17:59:43 +0100
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Re: Segmentation Fault in Pari/GP from gp2c-run
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- To: pari-users@pari.math.u-bordeaux.fr
- Subject: Re: Segmentation Fault in Pari/GP from gp2c-run
- From: Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>
- Date: Sun, 19 Feb 2023 17:58:12 +0100
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On Sun, Feb 19, 2023 at 07:57:32AM -0800, Edmond Griffin wrote:
> Hello,
>
> I am working on an old conjecture of Erdos-Turan using Pari/GP. Although the computations are simple, the number of them is very large. To speed things up, I hoped to convert my .gp code into C using gp2c. I am having difficulty doing so.
>
> I believe both gp and gp2c were built successfully on my machine - a quad core i7 MacBook Pro. When I compile and run the code using gp2c-run I get no warnings of undeclared or unused variables. I do get the following warning before gp starts:
>
> ld: warning: -undefined dynamic_lookup may not work with chained fixups
>
>
> Then when I call my function (extDnkc) I get
>
> ? extDnkc(15,6,0,"/Volumes/BinPolyData/Diffs/")
> *** user warning:
> *** at top-level: extDnkc(15,6,0,"/Volumes/BinPolyData/Diffs/")
> *** ^---------------------------------------------
> *** extDnkc: bug in PARI/GP (Segmentation Fault), please report.
>
>
> Can you suggest a course of action?
> fName = strjoin([fPath,strprintf("D_%d_%d_TN.csv", n, k)]);
> iferr(fIn=fileopen(fName,"r"), ERR,
> warning(strprintf("Bad input file: %s",fName)); return,errname(ERR)=="e_FILE");
Indeed, there is a bug in PARI that cause warning() to be miscompiled by gp2c.
I suggest to replace warning() by print() until we fix it.
Sorry for the trouble!
Cheers,
Bill