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Re: [gpsd-users] GPSD Modeling Errors

From: Eric
Subject: Re: [gpsd-users] GPSD Modeling Errors
Date: Mon, 4 Jan 2016 15:44:07 -0500
User-agent: Mutt/1.5.23 (2014-03-12)

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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