build.sh: use mk.conf (if present) as MAKECONF

Set MAKECONF to mk.conf in the same directory as build.sh
(i.e., the top of the source tree) if mk.conf is present.
This means unprivileged users can b

build.sh: use mk.conf (if present) as MAKECONF

Set MAKECONF to mk.conf in the same directory as build.sh
(i.e., the top of the source tree) if mk.conf is present.
This means unprivileged users can benefit from mk.conf(5)
semantics without write privileges to /etc/mk.conf, and
also simplifies per-source-directory configuration.

Fail early if $MAKECONF is empty, since build.sh will fail
anyway after rebuilding nbmake.

Ensure that the computed MAKECONF isn't empty, and then
always set MAKECONF in the makewrapper (nbmake-$MACHINE).

Improve some formatting consistency in BUILDING.mdoc,
(even if BUILDING is generated without markup).

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fix build.sh wrong variable use that caused nbmake to be always rebult
(Jan-Benedict Glaw)

build.sh: add show-params operation

Add show-params operation to the makefile target, and reword
params operation to describe what it's done since 2012.

(In 2012-11-04 the Makefile's previous param

build.sh: add show-params operation

Add show-params operation to the makefile target, and reword
params operation to describe what it's done since 2012.

(In 2012-11-04 the Makefile's previous params target was renamed
to show-params and a new params target was added to save a 'params'
file, and build.sh wasn't adapted.)

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build.sh: fix MKUNPRIVED comment

I renamed UNPRIVED to MKUNPRIVED 20 years ago, and missed a comment.

build.sh, BUILDING: consistency improvements

Consistently use "show", instead of sometimes using "display" or "print".
Fix mdoc markup (even though BUILDING is raw text).
Document help, -P, -?

build.sh: drop -lrumpdev hack introduced in previous

The existing trick in sys/rump/librump/rumpdev/rump_dev.c was not
updated after the renames in the kernel. kudos to riastradh.

PR kern/56599

build.sh: tweak rumptest and RUMP_LIBSETS

Use --no-whole-archive to keep us as honest as currently possible.
PR kern/56599

Avoid the dependency on a populated tooldir (or building the tools)
when simply doing mkrepro-timestamp and the current repository setups
does not actually require it.

build.sh: usage improvements

Use UPPERCASE as the convention to describe an option argument,
as it's more noticable than lowercase in the help description.

Expand tabs in the help.

Editorial impro

build.sh: usage improvements

Use UPPERCASE as the convention to describe an option argument,
as it's more noticable than lowercase in the help description.

Expand tabs in the help.

Editorial improvements.

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Deprecate extsrc/, EXTSRCSRCDIR, MKEXTSRC

Remove support for building extsrc/:
1. Makefile: remove do-extsrc target.
2. build.sh: remove options -y and -Y extsrcdir.
3. distrib/sets: remove support

Deprecate extsrc/, EXTSRCSRCDIR, MKEXTSRC

Remove support for building extsrc/:
1. Makefile: remove do-extsrc target.
2. build.sh: remove options -y and -Y extsrcdir.
3. distrib/sets: remove support for extsrc in various tools
including the options -L ext and -y, and the extsrc sets.
4. doc/BUILDING.mdoc: remove docs for extsrc/, EXTSRCSRCDIR, MKEXTSRC (etc)
5. bsd.own.mk and various Makefiles: remove support for extsrc/,
EXTSRCSRCDIR, MKEXTSRC.

As proposed on tech-kern and tech-userlevel on 2022-01-07
and followed up on 2022-08-21.

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build.sh: improve help and usage

Split help into synopsis and help.
Only display the synopsis for usage errors (not the full help).
Print usage errors to stderr not stdout.
Don't print a usage error

build.sh: improve help and usage

Split help into synopsis and help.
Only display the synopsis for usage errors (not the full help).
Print usage errors to stderr not stdout.
Don't print a usage error for -? before the help message.
Improve error messages for unknown options and missing arguments.
Remove trailing "." present in some error messages.
Alway use 'quote' instead of `quote' in some error messages.

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build.sh: improve help versus usage

Rework help / usage semantics:
- send help to stdout, exit 0.
- send usage to stderr, exit 1.

Don't try to install netbsd-CONFIG.debug files build with kernel=

Enable split-debug files for kernels. Enabled by default with MKDEBUG=yes.

remove duplicate the article in comments.

Patch the build script and toolchain to allow passing through
HOST_CPPFLAGS, HOST_CXXFLAGS, but not LIBRARY_PATH because it breaks
the build. These variables are necessary to support building NetBSD

Patch the build script and toolchain to allow passing through
HOST_CPPFLAGS, HOST_CXXFLAGS, but not LIBRARY_PATH because it breaks
the build. These variables are necessary to support building NetBSD
from a GNU Guix or NixOS host, where /usr/include, /lib, and all
but /bin/sh do not exist. In many cases, support for HOST_CPPFLAGS
was incomplete. From Ryan Sundberg

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Fix timestamp extraction logic for Mercurial repos to use UTC.
Extend logic to also cover "hg archive".

Add a new operation "mkrepro-timestamp" to extract the timestamp a
build with -P would use. Example usage:

./build.sh -T /usr/tools -P mkrepro-timestamp

This allows us to extract this information

Add a new operation "mkrepro-timestamp" to extract the timestamp a
build with -P would use. Example usage:

./build.sh -T /usr/tools -P mkrepro-timestamp

This allows us to extract this information once, make other use of it,
and replicate it on other machines with -V MKREPRO=yes -V MKREPRO_TIMESTAMP=..

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Fix rumptest target && enable separate rump target. From Damien Zammit

fix various typos in comments.

Good bye oabi! Tested building earmv7hf.

kre@ does not like the subshell :-)

handle different flavors of date(1)

for mercurial, use the latest revision instead of limiting the output to 1
(requested by joerg)

Handle git and mercurial for reproducible builds.