[Scons-users] Forcing projects to build in order

[Ora]

Hi Bill,

Dumping my commands in a python script and running that seems to have
solved the problem, thank you.

However, be aware that your second suggestion did not work.  That is, even
when I changed the command string to include the chdir command, SCons still
inserted other commands from parallel threads in between.


Thanks,
Ora





On Fri, Aug 7, 2015 at 4:52 PM, Bill Deegan <bill at baddogconsulting.com>
wrote:

> Ora,
>
> As I mentioned in a previous reply, the easiest solution is to wrap steps
> which must be run in a specific directory in a script. Then the step will
> not need SCons to change directory and there is no need to limit
> parallelism.
>
> Or you can change the command string from say "./runSomething -o $TARGET
> $SOURCES" to
> "cd somedir; ./runSomething -o $TARGET $SOURCES"
> That way it is not python but the invoked shell which is changing
> directories.
>
>
> -Bill
>
> On Fri, Aug 7, 2015 at 2:22 AM, Ora <orshalev at gmail.com> wrote:
>
>> Hi,
>>
>> During a few of the build steps the script calls various tools which MUST
>> be run in a specific directory.  That is not something I can change at this
>> point.
>>
>> Each such step is defined as its own builder which changes the directory
>> and runs the required tool.
>>
>> However, when running with the '-j' option, Scons tries to run several
>> such steps in parallel, and therefore, tries to execute commands in the
>> wrong directory.
>>
>> I cannot avoid parallelism altogether as it it would make my script run
>> for so long, it would be useless.
>> I cannot avoid changing directories.
>>
>> I wish SCons would handle changing directories properly on its own, but I
>> understand that's not going to happen.
>>
>> I am therefore looking for a solution to this problem by partially
>> limiting parallelism so that the builder steps / projects which change
>> directory would not be called in parallel with other builders.
>>
>>
>> Ora
>>
>> On Thu, Aug 6, 2015 at 7:11 PM, William Blevins <wblevins001 at gmail.com>
>> wrote:
>>
>>>
>>> On Thu, Aug 6, 2015 at 11:09 AM, Bill Deegan <bill at baddogconsulting.com>
>>> wrote:
>>>
>>>>
>>>>
>>>> On Thu, Aug 6, 2015 at 8:04 AM, William Blevins <wblevins001 at gmail.com>
>>>> wrote:
>>>>
>>>>> I cannot think of many (if any) good reasons to perform CWD.
>>>>>
>>>>> Can you modify your build to work without?
>>>>> On Thu, Aug 6, 2015 at 10:26 AM, Bill Deegan <
>>>>> bill at baddogconsulting.com> wrote:
>>>>>
>>>>>> Ora,
>>>>>>
>>>>>> Why do you want to force build order and/or limit parallelism?
>>>>>>
>>>>>>
>>>>> He is performing "change working directory" commands which cause
>>>>> issues with parallel builds.
>>>>>
>>>>
>>>> When I run into those I typically do env.Command(target,source,"cd xyz;
>>>> do actual command")  or wrap said command in a script and run that from the
>>>> command.
>>>>
>>>
>>> That makes sense.  Keeps the CWD commands outside the SCons context :)
>>>
>>>
>>>>
>>>>>
>>>>>> -Bill
>>>>>>
>>>>>> On Thu, Aug 6, 2015 at 3:58 AM, Ora <orshalev at gmail.com> wrote:
>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> My script builds several different projects which are not
>>>>>>> necessarily related.   How can I force those projects to build in a certain
>>>>>>> order?
>>>>>>>
>>>>>>> That is, I have three projects: a, b and c.
>>>>>>> I want 'b' to start building only after 'a' finishes, and for 'c' to
>>>>>>> start building only after 'b' finishes.
>>>>>>>
>>>>>>> This is necessary in order to avoid problems with changing
>>>>>>> directories during parallel builds.
>>>>>>>
>>>>>>> I tried using 'Requires', with every target requiring the target
>>>>>>> before it.
>>>>>>> Requires (b, a)
>>>>>>> Requires (c, b)
>>>>>>>
>>>>>>> But that doesn't solve the problem because, if I understood
>>>>>>> correctly, it only tells Scons that it should finish building 'a' before it
>>>>>>> finishes building 'b', and doesn't prevent it from compiling both projects
>>>>>>> at the same time.
>>>>>>>
>>>>>>> Any suggestions on how to deal with this issue would be appreciated.
>>>>>>>
>>>>>>> Thanks in advance,
>>>>>>> Ora
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>>
>>>>>>
>>>>
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