[Scons-users] Found dependency cycle

[Bill Deegan]

Perhaps a NO_AUTO_SCANNER env variable to control?
Would you make a pull request for such?
Ideally with a test...

-Bill

On Wed, Mar 22, 2017 at 11:12 AM, Dave Vitek <dvitek at grammatech.com> wrote:

> This sounds like the problem I described in my email last week: "2.5.0
> scanner fidelity regression since 2.3.4."
>
> We have been able to resolve the issue here by disabling the promiscuous
> scanner selection logic for builders that do not have scanners:
>
> Index: Node/__init__.py
> ===================================================================
> --- __init__.py (revision 134700)
> +++ __init__.py (working copy)
> @@ -952,9 +952,10 @@
>      def _get_scanner(self, env, initial_scanner, root_node_scanner, kw):
>          if not initial_scanner:
>              # handle implicit scanner case
> -            scanner = self.get_env_scanner(env, kw)
> -            if scanner:
> -                scanner = scanner.select(self)
> +            scanner = None
> +            #scanner = self.get_env_scanner(env, kw)
> +            #if scanner:
> +            #    scanner = scanner.select(self)
>          else:
>              # handle explicit scanner case
>              scanner = initial_scanner.select(self)
>
> Use at your own risk.  This may have negative consequences if you were
> relying on the promiscuous scanner selection behavior.
>
>
> On 3/20/2017 10:39 AM, Непомнящий Евгений wrote:
>
>> Hello
>>
>> I have file source.cpp, which #include generated file source.gen.h.
>> source.gen.h generate by other tool on the basis of source.cpp
>>
>> source.cpp
>> ----
>>
>> #include "source.gen.h"
>>
>> int main() { return 0; }
>>
>>
>> SConstruct
>> ----
>>
>> e = Environment()
>> e.Command("source.gen.h", "source.cpp", Copy('$TARGET', '$SOURCE')) #
>> "generator"
>> e.Program("source.cpp")
>>
>>
>>
>> This code works fine in Scons 2.1, but Scons 2.5.1 produce error:
>> scons: *** Found dependency cycle(s):
>>   source.gen.h -> source.gen.h
>>
>> File "C:\Python27\Lib\site-packages\scons-2.5.1\SCons\Taskmaster.py",
>> line 1043, in cleanup
>>
>> How do I get around this error?
>>
>> Thank you
>> _______________________________________________
>> Scons-users mailing list
>> Scons-users at scons.org
>> https://pairlist4.pair.net/mailman/listinfo/scons-users
>>
>
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