[Scons-users] Found dependency cycle

[Dave Vitek]

Perhaps.  How safe is it for the value of such a variable to change over 
time?  Does anything cache the result of the code below?  Would there 
need to be measures to enforce immutability?

On 3/22/2017 4:21 PM, Bill Deegan wrote:
> 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 
> <mailto: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
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