Re: [gpsd-dev] The carnivorous config bug

[Christian Gagneraud]

On 01/11/13 06:12, Eric S. Raymond wrote:
> 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").

There's another bug as well in the Sconstruct file that I reported a 
month or 2 ago, it relates to the static vs dynamic linking, and the 
order programs are built (gcc will do dynamic linking if the .so is 
built before the .a). The most anoying consequence is that the linking 
process is not repeatable and breaks when using parallel builds.
[For some unknown reasons, I couldn't find these emails on the ML 
archive...]

Another minor bug, is the build of the python bindings that doesn't 
pickup the project CFLAGS & co.

I would like to add other things to the list of configuration system issues:
- I'm about to send an RFC for the code coverage, as you will see it 
requires lot of modifications to collect the coverage data while 
executing the tests, this will have to be addressed
- Regression tests take time to execute because there are executed 
sequentially, it would be nice if they could be executed in parallel 
(especially raw-regress)

> 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.

What about using colors in the output, would it help to highlight the 
important parts? What about a "scons configure" command?

Chris
> 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.