[Scons-dev] Accommodating dependency cycles.

[Bill Deegan]

Should the default for Command() builder, then be as you listed above..

source_scanner = SCons.Scanner.Base( {}, name = 'CommandDefault', recursive
= False )

Can this be overridden in
env.Command()?

I think it could be useful to be able to enable such though.
If your command action actually does something like preprocessing..

On Thu, Mar 23, 2017 at 7:11 AM, William Blevins <wblevins001 at gmail.com>
wrote:

> Command Builder is probably running the CScanner because of adding the
> SourceFileScanner to default scanner list.
>
> On Mar 23, 2017 7:10 AM, "Gary Oberbrunner" <garyo at oberbrunner.com> wrote:
>
>
> On Wed, Mar 22, 2017 at 10:47 PM, William Blevins <wblevins001 at gmail.com>
> wrote:
>
>> Here is another one. I assume this round of issues is because they
>> updated SCons on the latest Ubuntu. This one actually makes sense. Someone
>> else posted this one. "test2.h" explicitly depends on "test.h" via Command
>> Builder, and "test.h" implicitly depends on "test2.h" via scanner.
>
>
> except not quite: the scanner makes (or *should* make) anything *compiled
> from* test.h (e.g. test.obj) depend on test2.h. test.h has no
> dependencies; it's a source. As perhaps you noted above, it seems like the
> Command builder is somehow running the C scanner, but shouldn't. If the
> Command in this example had been an Object or Program whose target was
> still called test2.h, then there would be a real dependency loop (because
> test.h includes test2.h, SCons shouldn't compile test.h into the result
> object until test2.h is up-to-date, and the result "object file" in that
> case is called test2.h).
>
> --
> Gary
>
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