I just tried both 1.3.1 and 2.0.1 and the same thing happens in both.

Steve

On Wed, Mar 23, 2011 at 11:20 PM, Ali Saidi <sa...@umich.edu> wrote:
> I just did some searching and found this.
> http://comments.gmane.org/gmane.comp.programming.tools.scons.user/20816
>
> Have you tried scons 1.3?  Maybe it's fixed.
>
> Ali
>
>
> Sent from my ARM powered device
>
> On Mar 23, 2011, at 11:39 PM, Steve Reinhardt <ste...@gmail.com> wrote:
>
>> I think many of us have noticed that scons sometimes rebuilds things
>> when it's not necessary.  Here's one clue:
>>
>> % scons build/ALPHA_SE/m5.debug
>> scons: Reading SConscript files ...
>> [...]
>> scons: done building targets.
>> % scons --debug=explain build/ALPHA_SE/m5.debug
>> scons: Reading SConscript files ...
>> [...]
>> [    SWIG] ALPHA_SE/python/swig/core.i -> _wrap.cc, .py
>> scons: rebuilding
>> `build/ALPHA_SE/python/m5/internal/vptype_AddrRange.py' because the
>> dependency order changed:
>>               old:
>> ['build/ALPHA_SE/python/m5/internal/vptype_AddrRange.i',
>> '/usr/bin/swig', 'build/ALPHA_SE/base/range.hh',
>> 'build/ALPHA_SE/base/types.hh', 'build/ALPHA_SE/python/swig/range.i']
>>               new:
>> ['build/ALPHA_SE/python/m5/internal/vptype_AddrRange.i',
>> 'build/ALPHA_SE/base/range.hh', 'build/ALPHA_SE/base/types.hh',
>> 'build/ALPHA_SE/python/swig/range.i', '/usr/bin/swig']
>> [...]
>>
>>
>> This is just one of many swig files that get regenerated... most of
>> the dependency lists are much longer, but in all of the ones I looked
>> at, /usr/bin/swig had moved from the second spot to the last spot on
>> the list.
>>
>> Subsequent rebuilds say that " `build/ALPHA_SE/m5.debug' is up to
>> date", but if I delete build/ALPHA_SE/python/m5/internal then it takes
>> *two* builds to get it back to that state again.
>>
>> Any ideas, Nate?
>>
>> Steve
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>>
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