[Scons-users] Scons Implicity Dependency not found issue

[Bill Deegan]

Wouldn't this work?

def usw_board_path(fn):
   return  "#"/$USW_BUILD_PATH/$USE_BUILD_FOLDER/%s"%fn

On Fri, Oct 26, 2018 at 5:59 AM Hua Yanghao <huayanghao at gmail.com> wrote:

> On Fri, Oct 26, 2018 at 9:45 AM Hua Yanghao <huayanghao at gmail.com> wrote:
> >
> > On Thu, Oct 25, 2018 at 10:08 PM Jason Kenny <dragon512 at live.com> wrote:
> > >
> > > Hi,
> > >
> > > I would recommend myself that you use duplicate=0 then. The point for
> duplicate=1 as default is that there are some tools that don't deal with
> files input output location and to help avoid possible issues if you have a
> large build and you might have modified a file while the build was going on
> ( given you tell SCons to make copies instead of hardlinks... ie this is
> the --duplicate option). There are a few issues with this however:
> > >
> > > 1) windows will make copies as SCons does not understand symlink or
> hard links on this platform with out some extension added to it
> > > 2) takes extra times as one has to create items
> > > 3) when it is making copies I have had issues I cannot explain yet (
> ie not looked in to enough) where scons does not update the files in the
> variantdir correctly making bad builds. ( I think that is what you are
> seeing)
> > >
> > > For large build the time save with duplicate=0 is a big deal, as well
> as the disk savings given the hard-soft-copy options is not working
> correctly
> > >
> > > Bill -- just a guess but I think the issue when copy is being used is
> that SCons nodes understand the variant and srcnode exists, but has no
> check, or depends logic to say variant version depends on the srcnode
> version so there are cases in which a depends on a variant node does mean
> that the srcnode "copy" update is not seen. So for example the scanner does
> gets a file and tests that it exists, but since the header does not have
> any builder the logic to understand that the it should update based on the
> value of srcnode() version is skipped.
> > >
> > > -Jason
> >
> > Thanks Jason. I am seriously considering doing so now ...
>
> In my build system, I made a clear decision that all compiled files
> goes to the variant_dir, such that the source folders are intact. This
> enabled a uniform way to specifying external dependencies where either
> a scons scanner is missing. Now If I use duplicate=0, then I need two
> different system to specify this kind of dependency, one for the files
> that is in the original source folders, and one for the files that is
> created on the fly in the variant_dir ... this breaks user APIs ...
> but I do see the build speed up quite a bit.
>
> So finally I come up with a new user-visible API that in SConscript
> for users: usw_board_path(fn): return
> os.path.join("#"+env["USW_BUILD_PATH"], env["USW_BUILD_FOLDER"], fn),
> I can see sometimes, especially with variant_dir, scons tries to be
> really smart (maybe a bit too much) that it tries to translate every
> single path it sees if without the leading #.
>
> I think I will settle with this one, looks like we really should use
> duplicate with great caution.
>
> Thanks Jason for sharing the experience of duplicate=1.
>
> BR, Yanghao
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