[Scons-users] Need help debugging my build

[William Blevins]

Dirk,

I ran a simple test:

SConstruct: SharedLibrary( 'a', 'a.cpp', SHLIBVERSION = '0.1.0' )
a.cpp: int main() { return 0; }

Under the following systems:
SCons 2.3.0, CentOS 6, python 2.6
SCons 2.3.4, CentOS 7, python 2.7

I got the same results on both, so this isn't a new issue.

On compile attempts 2 thru N, the link target is re-executed, and I get the
error: scons: *** [liba.so.0.1.0] File exists

V/R,
William

On Thu, Jun 11, 2015 at 8:31 AM, Dirk Bächle <tshortik at gmx.de> wrote:

> Hi Gottfried (Moin!),
>
> On 04.06.2015 16:31, Ganssauge, Gottfried wrote:
>
>> My build – which is somewhat large – normally runs fine using
>> scons-local-2.3.4 with python2.7.6 on Ubuntu Linux-14.04
>> But when I’m starting the same build twice in a row I’d expect it to
>> rebuild nothing at all the second time through.
>> The actual targets which I request aren’t rebuilt in fact but some
>> intermediate targets.
>>
>
> what happens when you rebuild the same target a third time? Is the output
> as you'd expect in run #3?
> Then, you can try to disable the implicit command dependency mechanism with
>
>   env['IMPLICIT_COMMAND_DEPENDENCIES'] = False
>
> and see if it helps.
> The underlying problem is, that SCons stores the list of dependencies (and
> its checksums) as ordered list (=vector, not dict). In your use case the
> number of children and their checksums stay the same...but their order
> changes from one run to the other. This may happen especially for files
> that get created during a build, because they get found earlier or later
> then while scanning folders for dependencies...depending on whether they
> already exist, how search paths are set, and how the implicit dependency
> graph is traversed.
>
> Best regards,
>
> Dirk
>
>
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