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Re: [gpsd-users] EXT :Re: GPSD Modeling Errors

From: Kuhn, Thomas J (IS)
Subject: Re: [gpsd-users] EXT :Re: GPSD Modeling Errors
Date: Wed, 6 Jan 2016 15:48:49 +0000

Thank you for the great information.  Is there a version where the significant 
bug was fixed so that I might be able to determine how bad our issue is? 

Thomas Kuhn <address@hidden>:
> GPSD v.2.95
> Cross compiled for ARM using Sourcery_G++ GPS module is a Sierra 
> Wireless MC7350 LTE module w/GPS
> I am newer to the world of Linux embedded development, and have been 
> tasked with tracking down why GPSD does not return any values for EPE 
> and other estimations.  I have run GPSD with -D8 and am noticing that 
> I am seeing a "Modeling Errors: Mode-1..."  I am not exactly sure what 
> the modeling error is, but my guess based on other reading is that 
> modeling can fail if certain compiler settings are wrong, or other 
> compiler issues.  I guess dealing with Floating point stuff.

Yes, this was a significant issue before gcc-4.x.

> The GPSD executable was built quite a while ago, and we have just been 
> using the built version for our embedded builds.  I am wondering if 
> perhaps upgrade, or rebuild with different settings?

Upgrade and rebuild.  2.95 is very old; at leastr one significant bug in the 
error modeling has been fixed since.
                <a href="";>Eric S. Raymond</a>

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