Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r253072: amd64: use -mno-omit-leaf-frame-pointer in addition to
-fno-omit-frame-pointer

MFC r232263:

Define several extra macros in bsd.sys.mk and sys/conf/kern.pre.mk, to
get rid of testing explicitly for clang (using ${CC:T:Mclang}) in
individual Makefiles.

Instead, use the following extra macros, for use with clang:
- NO_WERROR.clang (disables -Werror)
- NO_WCAST_ALIGN.clang (disables -Wcast-align)
- NO_WFORMAT.clang (disables -Wformat and friends)
- CLANG_NO_IAS (disables integrated assembler)
- CLANG_OPT_SMALL (adds flags for extra small size optimizations)

As a side effect, this enables setting CC/CXX/CPP in src.conf instead of
make.conf! For clang, use the following:

CC=clang
CXX=clang++
CPP=clang-cpp

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Upgrade our copy of llvm/clang to r126079, from upstream's trunk.

This contains many improvements, primarily better C++ support, an
integrated assembler for x86 and support for -pg.

Add a kernel option for amd64 to compile with the frame on the stack
so that the DTrace Function Bounadry Trace (fbt) provider can get
coverage of most functions in the kernel.

Kernel and hwpmc(4) support for callchain capture.

Sponsored by: FreeBSD Foundation and Google Inc.

Revert config(8) version bump. It brings major pain for people working on
different versions of FreeBSD source tree.

Old config(8) can now be used unless you want to use INCLUDE_CONFIG_FILE
option.

Approved by: imp
Reviewed by: imp

Bump config(8) version and build requirement for config(8) to 600006. This
is caused by my latest changes to config(8). You're supposed to install new
config(8) in order to prevent yourself from seeing a warning about old
version of that tool.

You should configure the kernel with a new config(8) then.

Oked by: rwatson, cognet (mentor)

Version 600004 is better than 700000 given other changes that are in
the pipeline. We had to bump the version for 600004 because the old
parser got confused and generated bogus output.

Approved by: ru@

Make config(8) understand ORed dependecies in "files*" and
improve tracking of known devices. Bump config(8) version.

We don't bump the config version for additions to config that aren't
used in the base system. This has been much discussed in the past
(typically people giving me a hard time for it). Since all that was
added to config was nocpu, and since we don't use it, we don't need to
bump the version.

Implement the "nocpu" directive.

Requested by: rwatson

Bump config(8) version for the DEFAULTS change.

Use the more readable empty() syntax.

Never hardcode /sys into these Makefiles. The proper way to spell it is $S.

Also, move the -I stuff to the centralized kern.pre.mk. However, it
might be better to add these flags to files.conf. This is a short
term fix to fix the broken builds on my machine (I don't have a valid
/sys link).

The latest release of the FreeBSD driver (twa) for
3ware's 9xxx series controllers. This corresponds to
the 9.2 release (for FreeBSD 5.2.1) on the 3ware website.

Highlights of this release are:

1. The driver has been re-architected to use a "Common Layer"
(all tw_cl* files), which is a consolidation of all OS-independent
parts of the driver. The FreeBSD OS specific portions of the
driver go into an "OS Layer" (all tw_osl* files).
This re-architecture is to achieve better maintainability, consistency
of behavior across OS's, and better portability to new OS's (drivers
for new OS's can be written by just adding an OS Layer that's specific
to the OS, by complying to a "Common Layer Programming Interface" API.

2. The driver takes advantage of multiple processors.

3. The driver has a new firmware image bundled, the new features of which
include Online Capacity Expansion and multi-lun support, among others.
More details about 3ware's 9.2 release can be found here:
http://www.3ware.com/download/Escalade9000Series/9.2/9.2_Release_Notes_Web.pdf

Since the Common Layer is used across OS's, the FreeBSD specific include
path for header files (/sys/dev/twa) is not part of the #include pre-processor
directive in any of the source files. For being able to integrate twa into
the kernel despite this, Makefile.<arch> has been changed to add the include
path to CFLAGS.

Reviewed by: scottl

Update version number for latest config version bump

bump the Makefile config versions now that config is 600001...

Forgotten by: des

Kill count device support from config. I've changed the last few
remaining consumers to have the count passed as an option. This is
i4b, pc98/wdc, and coda.

Bump configvers.h from 500013 to 600000.

Remove heuristics that tried to parse "device ed5" as 5 units of the ed
device. This broke things like the snd_emu10k1 device, which required
quotes to make it parse right. The no-longer-needed quotes have been
removed from NOTES, GENERIC etc. eg, I've removed the quotes from:
device snd_maestro
device "snd_maestro3"
device snd_mss

I believe everything will still compile and work after this.

Change required config(8) version.

Stop this warning:
"Makefile", line 35: warning: "grep DDB opt_ddb.h" returned non-zero status

Add ddb machdep bits.

Approved by: re (amd64 bits)

s/x86_64/amd64/ in comments in header.

Approved by: re (blanket amd64)

Remove special hacks for FSF cross tools now that it builds natively.

Sync up with the files in the hammer branch in the p4 tree to get basic
AMD64 support. There is still more to add.

Bump the config version to force people to upgrade their config(8)
so the fix for emitting multiple instances of .o files will prevent
link errors on LINT.

Standardize handling of locore.[sS] etc. files.

Submitted by: jake, bde, ru

Moved the rule for locore.o from kern.post.mk to Makefile.$ARCH.

Moved the setting of all profiling-related variables except the key one
(PROFLEVEL) to kern.pre.mk so that it is easier to manage. Bumped config
version to match.

Moved the check for cputype being configured to a less bogus place in
mkmakefile.c.

This is the start of the FreeBSD/x86_64 kernel.