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Re: [gpsd-dev] Half the port problems are solved; seeking help with RTCM

From: Eric S. Raymond
Subject: Re: [gpsd-dev] Half the port problems are solved; seeking help with RTCM2 driver
Date: Mon, 28 May 2012 23:18:00 -0400
User-agent: Mutt/1.5.21 (2010-09-15)

Bernd Zeimetz <address@hidden>:
> > If so, that is good news.  It means the big-endian version of the weird
> > structure-overlay hack I used is working.  In turn, that means that 
> > the only failures are machines for which the compilers ignore #pragma 
> > pack(1).
> > 
> > I know in a general way how to fix this, but the details will be ugly
> > and difficult.
> Actually it was easy - I've tried it on s390 only, but I guess it fixes sparc
> and s390x, too:

Your words imply that once BIG_ENDIAN_WORDS is set properly, the wacky
structure-overlay hack works perfectly on *every architecture*, regardless
of word length or endianness, including the really odd ones like s390.

That code is mad science, a textbook example on several levels of how
*not* to do portability.  And yet, I got it *right*? I am utterly
                <a href="";>Eric S. Raymond</a>

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