[Scons-users] What affects rebuilding?

[William Blevins]

May also be a VariantDir specific issue.

V/R,
William

On Tue, Jun 30, 2015 at 10:37 AM, William Blevins <wblevins001 at gmail.com>
wrote:

> I think this is the issue you are describing.
>
> http://scons.tigris.org/issues/show_bug.cgi?id=2980
>
> There is part of a patch attached.  I looked at it at some point, but
> there were still tests failing.
>
> V/R,
> William
>
> On Tue, Jun 30, 2015 at 10:23 AM, Douwe Gelling <douwegelling at gmail.com>
> wrote:
>
>> I have a problem where scons rebuilds files when I change targets on the
>> commandline.
>> I make use of the COMMAND_LINE_TARGETS list to optionally use some other
>> sconsfiles,
>> and also use variant directories to set the object output directories. It
>> seems somehow this
>> may all be interacting with each other.
>>
>> Specifically, I get the following type of behaviour:
>>
>> 1. I build my program using the default target (scons -jN ...)
>>
>> 2. I build some extra program by setting a new target. It depends on some
>> files that were compiled before,
>>     but decides to rebuild it. Using --explain, I get the following type
>> of message:
>>
>> rebuilding 'a/b/c/d.o' because
>>    a/b/c/d.cpp is no longer a dependency
>>    a/b/c/d.cpp is a new dependency
>>
>> 3. I build my default program again, scons rebuilds everything yet again,
>> giving the same message as in 2.
>>
>> I've changes the scons source a bit to show more information in the
>> explain function, and it turns out that
>> in both steps 2 and 3, the file that is no longer a dependency is the
>> original cpp file, and the file that is a
>> new dependency is the file located in the variant directory (say,
>> a/b/c/obj/linux/x86_64/d.cpp).
>>   This happens even though in the call to VariantDir, duplicate is set to
>> 0. If I set it to 1 instead, the message
>> scons gives me is that it's rebuilding 'because the contents of the build
>> action changed'
>>
>>
>> On 30 June 2015 at 15:31, William Blevins <wblevins001 at gmail.com> wrote:
>>
>>> See the Decider section of the man page for how scons determines if a
>>> source has changed.
>>>
>>> SCons also checks for changes to the overall build command as generated
>>> by the executor.
>>>
>>> What is your specific question?
>>>
>>> V/R,
>>> William
>>> On Jun 30, 2015 5:28 AM, "Douwe Gelling" <douwegelling at gmail.com> wrote:
>>>
>>>> Hi all,
>>>>
>>>> I'm wondering which things scons tracks when deciding whether or not to
>>>> rebuild a file, apart
>>>> from the file itself. I know changing commandline variables forces a
>>>> rebuild, but are there other
>>>> things that do the same? For example, does scons look for changes in
>>>> the environment for a particular file? Or something else?
>>>>
>>>> thanks
>>>>
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>>>>
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>>
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