Add SConstruct option 'xml' to request XML trace output

[derammo]

Summary

This is a tool I added to SConstruct so that I could create XML of what was exactly was built with what options. This allows for analysis or external tooling.

It is very basic and possibly ugly, because I am no SCons expert. I won't be developing this any further, but it works fine in my tool chain, so I am offering it here in case it is useful to others. I will also be sharing my external build tool for running rapid rebuilds in Visual Studio that relies on this, but it is easy enough for me to just always merge this to my development branches, if you don't want to include it.

Instructions

Clean the build, so that everything will be built. Run scons with your usual options and add xml=true. Redirect the output to a file if you want the entire log or | grep __BUILD_DATA_MAGIC_COOKIE__ to get a valid XML document.

[akien-mga]

Is there a specific reason why you need a XML trace instead of using the already available compilation database in JSON format? (compiledb=yes)
The compiledb would also always be correct even if it's not a clean rebuild.

[derammo]

Is there a specific reason why you need a XML trace instead of using the already available compilation database in JSON format? (compiledb=yes) The compiledb would also always be correct even if it's not a clean rebuild.

Nope, probably no reason. I just wasted a lot of work :). Thanks. [edit: no I did not, phew]

[derammo]

I'll come back if I can't make it work with the JSON that I didn't know about.

[derammo]

The JSON file is only the equivalent of the <cxx> and <cc> tags and is unstructured. I can't use it to recreate a build, because there is no information about linking, archiving, or resources.

[derammo]

Withdrawn. It's easy enough to just apply the patch and probably there won't be many people using this going forward.