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[gpsd-dev] The carnivorous config bug

From: Eric S. Raymond
Subject: [gpsd-dev] The carnivorous config bug
Date: Thu, 31 Oct 2013 13:12:38 -0400 (EDT)

I was so burned out last time I posted that I forgot to actually
describe the carnivorous config bug. It goes like this: if you
"scons -c", then do not nuke the scons cache with "rm -fr .sc*",
some but not all feature tests will spuriously fail (that is, return
"no" when they should return "yes").

One of the spurious failures will be the test for TIOCMWAIT.  That
failure will force pps off.  Hilarity ensues if you're trying to fix
PPS-related bugs.  I missed this for two days because the config lines
tend to scroll out of view really fast.

So, if you scons -c to clear your build state, nuke the scons cache
with "rm -fr .sc*", too.

I don't know whether this is a bug in core scons or a specific problem 
with the Configure extensions. I suspect the latter.  

I've sent a bug report to the scons-users mailing list.
                <a href="";>Eric S. Raymond</a>

"Among the many misdeeds of British rule in India, history will look
upon the Act depriving a whole nation of arms as the blackest."
        -- Mohandas Gandhi, An Autobiography, pg 446

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