Build work 11.0 plans status update

[Glen Barber]

On Thu, Jun 30, 2016 at 09:42:35AM -0700, Bryan Drewery wrote:
> (bcc'd some specific interested parties)
> 
> This is from a private mail I sent to re@ a while back and is a status
> update for upcoming work.
> 
> > On Fri, May 27, 2016 at 11:18:58AM -0700, Bryan Drewery wrote:
> >> Heads up, I intend to continue adding a few new features during the
> >> slush/stable period since they are so impactful.  They will be
> >> off-by-default for stable/11 at this point I guess.  I feel this is fine
> >> since it is not ABI-related.
> >>
> >> - AUTO_OBJ: For subdir builds and buildworld, automatically create obj
> >> dirs without needing 'make obj'.  I wanted to enable this by default but
> >> can wait for the branch to be created.  There is some work pending for this.
> >> - Using objdir pattern of /usr/obj/usr/src/TARGET.TARGET_ARCH/bin/sh for
> >> all archs, not just non-native.  I'd prefer this made it into stable/11.
> >>  Very little work remaining for this.
> >> - WITH_META_MODE: Fixed incremental (with default -DNO_CLEAN) build
> >> (mail pending to current@ soon). No work remaining except 1 pending
> >> commit.  Not planning on-by-default for stable/11.
> >> - Build clang once for universe regardless of WITH_SYSTEM_COMPILER.
> >> On-by-default.  I really intend to make this into stable/11.  It will be
> >> too great of a time savings to ignore for 11 release testing IMO.
> >>
> > 
> 
> Just an update...
> 
> - WITH_SYSTEM_COMPILER is now on by default.  There has been some
> unexpected fallout from this such as with ppc64 thinking it was using
> a newer gcc (fixed), or the xlint build failing for 1 user (still not
> fixed).
> 
> - META_MODE should mostly be done now.  Some fixes/tweaks may still
> trickle in for edge cases, such as allowing WITH_SYSTEM_COMPILER to work
> with it.  The problem is that flip-flopping between using an internal
> and external compiler and it adding -target/--sysroot flags in on the
> 2nd build and meta mode detecting the changed build command.  I would
> like to always pass these flags, even with the internal cross-compiler,
> to fix the problem.  I think the lld effort would be happy with this too.
> 
> - Building clang once in universe isn't coming soon.  Likely 3-4 weeks
> out.  I'll cross the question of merging once it is done and how
> intrusive it is.  I believe it may be a bit more complex than I imagined
> to make it clean and easily maintained.  It would need a pre-universe
> "universe-toolchain" phase that changes how universe works a lot.  I
> consider it overall trivial but don't want to duplicate too much code.
> It somewhat relies on the new AUTO_OBJ work too.  More time is needed on it.
> 
> - AUTO_OBJ I am splitting into 3 separate patches after feedback.
>   1. Removing 'make obj' treewalks from buildworld/buildkernel.  This is
>      coming in the next few days.  No risk to it.
>   2. Unifying the objtree as like
>      /usr/obj/usr/src/TARGET.TARGET_ARCH/bin/sh.  This I will bring in
>      an option of UNIFIED_OBJDIR to flip between the old and new
>      patterns.  Some tools such as picobsd and the options survey will
>      rely on the old pattern.  A CFT is needed to discover what else
>      relies on the old patterns still.  There's also a problem of
>      migrating from the old tree to the new.  I will bring this patch
>      as off-by-default to re@ in the next week.
>   3. Default AUTO_OBJ in subdirs.  This one is kind of tricky and needs
>      some more thought.  Non-root especially may be problematic since
>      it will try to write to /usr/obj by default.  I likely will hold
>      off on this and not propose it for 11.0.
> 

Regardless of if some of this does not make it into 11.0-RELEASE, thank
you very much for all your hard work on these fixes, features, updates,
and bug fixes.

Glen

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