Merge from head

Merge from head

Sponsored by: Gandi.net

Let SUBDIR_OVERRIDE with 'make buildworld' be more useful.

Now it can be used to effectively "build in a subdir". It will use the
'cross-tools', 'libraries', and 'includes' phases of 'buildworld' t

Let SUBDIR_OVERRIDE with 'make buildworld' be more useful.

Now it can be used to effectively "build in a subdir". It will use the
'cross-tools', 'libraries', and 'includes' phases of 'buildworld' to properly
setup a WORLDTMP to use. Then it will build 'everything' only in the
listed SUBDIR_OVERRIDE directories. It is still required to list custom
library directories in LOCAL_LIB_DIRS if SUBDIR_OVERRIDE is something
that contains libraries outside of the normal area (such as
SUBDIR_OVERRIDE=contrib/ofed needing LOCAL_LIB_DIRS=contrib/ofed/usr.lib)

Without these changes, SUBDIR_OVERRIDE with buildworld was broken or hit
obscure failures due to missing libraries, includes, or cross compiler.

SUBDIR_OVERRIDE with 'make <target that is not buildworld>' will continue to
work as it did before although its usefulness is questionable.

With a fully populated WORLDTMP, building with a SUBDIR_OVERRIDE with
-DNO_CLEAN only takes a few minutes to start building the target
directories. This is still much better than building unneeded things via
'everything' when testing small subset changes. A BUILDFAST or
SKIPWORLDTMP might make sense for this as well.

- Add in '_worldtmp' as we still need to create WORLDTMP as later targets,
such as '_libraries' and '_includes' use it. This probably was avoiding
calling '_worldtmp' to not remove WORLDTMP for debugging purposes, but
-DNO_CLEAN can be used for that.

- '_legacy' must be included since '_build-tools' uses -legacy.
The SUBDIR_OVERRIDE change came in r95509, while -legacy being part
of build-tools came in r113136.

- 'bootstrap-tools' is still skipped as this feature is not for
upgrades.

- Fix buildworld combined with SUBDIR_OVERRIDE not installing all includes.

The original change for SUBDIR_OVERRIDE in r95509 kept '_includes'
and '_libraries' as building everything possible as the SUBDIR_OVERRIDE
could need anything from them. However in r96462 the real 'includes'
target was changed from manual sub-makes to just recursing 'includes'
on SUBDIR, thus not all includes have been installed into WORLDTMP since then
when combined with 'buildworld'.

This is not done unless calling 'make buildworld' as it would be
unexpected to have it go into all directories when doing 'make
SUBDIR_OVERRIDE=mydir includes'.

- Also need to build the cross-compiler so it is used with --sysroot.
If this is burdensome then telling the build to use the local compiler
as an external compiler (thus using a proper --sysroot to WORLDTMP) is
possible by setting CC=/usr/bin/cc, CXX=/usr/bin/c++, etc.

- Don't build the lib32 distribution with SUBDIR_OVERRIDE in buildworld
since it won't contain anything related to SUBDIR_OVERRIDE. Testing
of the lib32 build can be done with 'make build32'.

- Document these changes in build.7

Sponsored by: EMC / Isilon Storage Division
MFC after: 2 weeks

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Merge sync of head

MFhead @ r277403

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

Bump .Dd again for the change done in r276483

Pointyhat to: me

MFhead @ r276594

The variable used with install(1) for stripping should be STRIPBIN, not
STRIP_CMD

MFC after: 3 days
Reported by: lev

Merge ^/head r274961 through r276342.

Bump .Dd for change done in r275908

MFhead @ r275911 (also, sort out MK_* flags in BMAKE, etc on this branch)

Merge ^/head r275759 through r275911.

Document STRIP_CMD in build(7) and note its importance with LOCAL_ITOOLS

MFC after: 1 week
Phabric: D1335
Reviewed by: brueffer
Sponsored by: EMC / Isilon Storage Division

IFC @r269962

Submitted by: Anish Gupta (akgupt3@gmail.com)

Merge head from 7/28

Sync to HEAD@r269943.

Drop references to updating over csup from build(7).

MFC after: 1 week

use .Mt to mark up email addresses consistently (part6)

PR: 191174
Submitted by: Franco Fichtner <franco at lastsummer.de>

- Add a LOCAL_ITOOLS to allow adding additional tools required for the
installworld and distributeworld targets

PR: 179562
Submitted by: Garrett Cooper <yaneurabeya@gmail.com>
MFC after: 1 week

MFC @ r266724

An SVM update will follow this.

Merge head

IFC @264767

Merge head up to r263906.