Support OS400 system

[zheddie]

This PR is for OS400 system support. Can anybody kindly help to review and merge it? thanks.
"configure.py" is deprecated in ninja-build project, and it does not support OS400 system.

[zheddie]

@mayeut , Hi , I am new to this project. Can you help review this PR ? Or help to find a correct reviewer for it ? Thanks.

[henryiii]

Can we avoid configure.py on other systems too?

[zheddie]

Yes, In theory, it should work on other platform as well. But I do not want to break other platforms with my PR. :-). If they wish, they can also follow this way.

Or , do you want me to make it done as well for all platforms? thanks.

[zheddie]

@henryiii

[henryiii]

I was waiting to see if @mayeut had any comment, since he's been involved in helping with some of these sorts of systems & Ninja.

I'd say yes, because then it's much easier to test and see if the new configuration system is working. I don't have an OS400 system to see if the new code works.

[henryiii]

(but don't destroy your history, in case it needs revision)

[zheddie]

@mayeut , any comments ? thanks.

[zheddie]

Anyway, I am following the @henryiii 's suggestion to trying using the cmake on all platforms instead of IBM i only. Wish this would pass all the integration test on your available systems. I have verified on IBM i platform. thanks.

[henryiii]

LGTM. Will wait a bit for @mayeut to have a chance to approve, then will merge (remind me if I forget).

[mayeut]

Sorry for jumping in so late in the process.
LGTM, I'm just a bit scared of changing this because we don't have that much tests but I'll add some more in another PR.

[zheddie]

Thanks for your help guys. @mayeut , can I know when can we have a release with this code available? I noticed that seems we didn't release anything in the whole of 2022? :-(.