[Scons-users] Need a better message when MSVC caching enabled

[Eric Fahlgren]

No need to be sorry, quite the opposite.  I remember thinking that this
could (would) happen when I started using it, but then simply forgot. On
the other hand, I will definitely not stop using the caching, the
improvements in speed we see are quite large (a invocation of SCons when
everything is up-to-date now takes about 0.5 seconds!, previously was
around 6-10 seconds), so I am a huge fan of this feature and thanks again
for adding it.

On Sat, Feb 1, 2020 at 6:33 AM Mats Wichmann <mats at wichmann.us> wrote:

> On 1/31/20 8:58 PM, Eric Fahlgren wrote:
> > So, I updated MSVC on a couple of machines today and all of a sudden I'm
> > getting error messages about "cl not found".
> >
> >>>> scons: Reading SConscript files ...
> >>>>
> >>>> scons: warning: Could not find MSVC compiler 'cl', it may need to be
> > installed separately with Visual Studio
> >>>> File "SConstruct", line 54, in __init__
> >
> > I start digging in and the  path is pointing to the old version of the
> > compiler, hmm where is this coming from?  A couple hours of hair pulling
> > later I realize, oh $#!t, I've got SCONS_CACHE_MSVC_CONFIG turned on, so
> > I delete ~/.scons_msvc_cache, voila, everything works fine.
> >
> > Could we enhance the warning message to also say something like "if you
> > have caching enabled, it may be out of date, see <path-to-cache-file>"
> > or something like that?
> >
> > I personally will never forget this again 😬, but it might help someone
> > else in the future.
>
> I'll look at how to improve on it.  This was the reason the feature was
> marked experimental, figured something would go awry somewhere.
>
> "A couple hours ... later I realize... I've got SCONS_CACHE_MSVC_CONFIG
> turned on"
>
> Sorry about that - it kind of reinforces why SCons doesn't like to
> depend on the setting of environment vars, it's not always clear who's
> got what set up :)
>
>
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