[Scons-users] SCons working with Ninja

[Mats Wichmann]

On 4/14/21 2:22 PM, Gary Granger wrote:
> Hello Don,
> 
> For whatever it's worth, we have a tool to generate ninja files from 
> SCons, but I did not try to solve the problem of running python 
> functions from ninja.  Instead, the tool generates a ninja build file 
> from the nodes, and then it lets scons build just the nodes which do not 
> use command line actions.  Most of our python function builders generate 
> source files and version header files, so they are the leaves of the 
> dependency graph and it doesn't matter if ninja cannot build them. 
> Building the few python actions establishes a 'build baseline', then 
> ninja builds the rest.  Obviously not complete, since someone has to 
> remember to rebuild the ninja file if the python dependencies change. 
> Although I suppose the tool could be modified to list all the python 
> targets with a rule to re-run scons to build just those.  And maybe this 
> does not help you, if most of your actions are not command lines.
> 
> That said, we don't use this much because in practice it's easier to 
> just stick with scons for everything.
> 
> https://github.com/NCAR/eol_scons/blob/master/eol_scons/tools/ninja.py
> 
> The ninja support mentioned by Mats is surprising news, I'll be 
> interested to see how that works.

The current PR is here: https://github.com/SCons/scons/pull/3642
or maybe the folks working on it will comment further.


> 
> Gary
> 
> On 4/14/21 1:42 PM, Don Baldwin wrote:
>> Thanks Mats.  Will this be implemented in SCons 3.x as well as 4.x?  
>> We are planning on moving to 4.x fairly soon, but we aren't there yet, 
>> and will probably not move our older projects to 4.x.  Also, do you 
>> have an ETA of when this will be available?
>>
>> Also, what about existing tools that claim to support generating Ninja 
>> scripts from SCons builds, such as:
>>
>>     * https://github.com/RedBeard0531/mongo_module_ninja

it's related to Mongo's Ninja module.