[Scons-users] Unexpected messge with configure

[Bill Deegan]

Mats,

How long does:
scons --help non-existant-target
Take?

-Bill

On Fri, Sep 7, 2018 at 12:26 PM Mats Wichmann <mats at wichmann.us> wrote:

> On 09/07/2018 09:55 AM, Jason Kenny wrote:
> > I was adding some configure logic to a build I am working on. When doing
> a dry run i now get this error:
> >
> > scons: *** Cannot update configure test ".sconf_temp/conftest_0" within
> a dry-run.
> > File "./../scons-3.0.1/SCons/Script/SConscript.py", line 614, in __call__
> >
> > Is this a known issue with using configure in scons?
>
> I've run into it (you'll find my name on such questions in the mailing
> list archive, afair).
>
> When you stop and think about it, running a configure test which means
> compiling code sort of doesn't fit the definition of "dry run", though.
>
> this is a gray area to my way of thinking.  steps like cleaning, getting
> help, and doing a dry-run are places where you don't want external work
> to happen, just have scons go through the rules.  but sometimes you
> don't know what all the dependencies actually are before you've run some
> of those steps.
>
> we'll wait for the actual experts to pipe up :)
>
> ======
> Aside:
> on the project I'm trying to gradually bend into shape (it had lived for
> a couple of years before I came around), which uses a variant directory
> build, starting with the variant directory completely absent, "scons
> --help" takes seven seconds, and leaves a variant directory with 12
> object files and four libraries built. I *KNOW* that's wrong, but I
> haven't yet figured out how to fix it without either breaking
> everything, or special-casing stuff all over the place like
>
> if not env.GetOption('help') and not env.GetOption('clean'):
>
> guess we could put GetOption('dry-run') in that list too (would we have
> to include all of the variants of that name? -n, --no-exec,
> --just-print, --dry-run, --recon)
>
> with 200+ sconscripts, adding those cases is not appealing.
>
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