Switch to mach or similar

[Manishearth]

The code is getting rather large. Why not switch to mach or a similar system?

Mach is a python script that Firefox uses to manage tests and direct the build. It wraps around the makefile and provides a lot of useful functions.

A couple of things servo-mach could have:

• Better test management. We should be able to run individual tests directly.
• Clobber warnings for rustc, spidermonkey, and other heavy dependencies.

[mbrubeck]

Some more items for the wishlist:

• Better default options for fast builds (e.g. -j4 on a 4-core machine).
• A config file for default configure options, so you don't need to remember to pass them each time you have to re-run configure.

[Manishearth]

It might also be ideal to cache part of the configure stuff, or to separate the run-once parts from the run-many-times. If I just want a submodule sync , the "checking for integers" bit shouldn't have to run every time.

[Ms2ger]

Just to clarify: mach by itself isn't a build system, it's a generic python command dispatching framework that provides a nicer way to interact with the tree than undocumented make targets. Its relation to the build system for Gecko is that using mach build abstracts away the underlying build system, making it easier to swap out the recursive make build system when the replacement is ready.

[tetsuharuohzeki]

We can close this by #3230 was landed.