[Bf-committers] New Developer Meeting minutes

[Erwin Coumans]

The fact that cmake can create visual studio projects, Xcode projects  
and makefiles should make scons, make and manual msvc project  
maintenance obsolete.

It is a pity people don't maintain/fix cmake.
Thanks,
Erwin

Sent from my iPhone

On Jan 7, 2010, at 1:56, Campbell Barton <ideasman42 at gmail.com> wrote:

> The build system topic took most of the meeting or so and I hope we
> dont let this happen again or the new dev meetings will get very
> uninteresting.
> Please next time try to avoid arguing about stupid topics like this
> while we are trying to give basic info to new devs.
>
> I think topics like this just need better WIKI Docs and not discussion
> with new devs. (Or limit to 5min intro)
> ----
> Hi Nathan, I didnt mean to say scons does full rebuilds, just that its
> slower if you do quick rebuilds.
> SCons is great to get a build running however for development Im now
> quite convinced its not the way to go.
>
> When nothing needs building, CMake's Makefiles take around 2.1 seconds
> on my system. Scons takes between 30 and 40 seconds.
> Time to compile and link with one change with CMake made is 6.8  
> second or so.
> I have tried optimizing scons before and I can get moderate
> speedups... but it still doesnt get close to CMake's.
>
> SCons with BF_QUICK gives more acceptable times but this means I waste
> time thinking about what libs to build and occasionally getting it
> wrong and having to find out why BF_QUICK failed.
>
> I appreciate your work on scons and dont mean to belittle it but with
> CMake so much faster for rebuilds I feel justified in recommending
> CMake over scons for people who intend to build often.
>
> - Campbell
>
> On Thu, Jan 7, 2010 at 8:46 AM, Nathan Letwory  
> <jesterking at letwory.net> wrote:
>> Roger Wickes wrote:
>>>
>>> We held our second monthly new developer meeting(http://wiki.blender.org/index.php/Dev:SundayMeetingAgenda/NewDev_meetings 
>>> )
>>> on Sunday, attracting x new developers to the Blender family.
>>> Minutes are here: http://wiki.blender.org/index.php/Dev:SundayMeetingAgenda/NewDev_meetings/2010-01-03rd 
>>> .
>>> We discussed Build systems, Patch Submission, and Python, with a  
>>> focus on Cmake versus Scons.
>>
>> Hi, great to see that the second new dev meeting has been held -  
>> too bad
>> I couldn't be there, since SCons has been talked about, too.
>>
>> I feel I have to make a small comment though:
>>
>> SCons never does a full recompile, when it is not necessary (and it
>> hardly ever is). So in that sense, SCons will also do incremental
>> builds. Sure, it does read in the SConscripts, but *that is not
>> equivalent to a complete rebuild*. It does pose some slight overhead
>> when starting a build, but that should not be the reason to start
>> favoring CMake over SCons. Again: SCons builds only what is needed.
>>
>> When doing a clean rebuild, (remove *everything* created by SCons/ 
>> CMake
>> before doing your build), I assure you that you won't find useful
>> differences in build times.
>>
>> I have started writing out docs on the SCons system on my blog
>> http://www.letworyinteractive.com/b/building-blender-with-scons/ (see
>> also the top navigation for more links). More info there will  
>> gradually
>> be published as I get it all written out. It already contains good  
>> info
>> on how the configuration of the system goes.
>>
>> /Nathan
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>>
>
>
>
> -- 
> - Campbell
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