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Default branch: MAIN

Merge changes from current as of 20200406

1. Remove all the special handling of variables (-d -p -P -s -S) that
   were dealing with DBG (-d) LDSTATIC/NOPIE (-p), and the rest with
   disabling/enabling sanitizers.
2. Use emalloc/estrdup for all the allocators instead of only some cases.
3. Add -V varspec which passes variables on the command line (as DBG
   and LDSTATIC used to be passed before) instead of appending them
   to the on-the-fly Makefile using -v varspec.
4. Change the distrib and rescue Makefiles to use -V instead of the removed
   flags.

The motivation of this is to make variable handling consistent, less magical,
and remove the need for changing crunchgen each time we want to add disabling
an option by default.

(as proposed in tech-toolchain)

Sync with HEAD

bump ramdisk sizes to cope with GCC 7 bloat.

bump

Sync with HEAD

Sync with HEAD

+= for MAKEFS_FLAGS

Rebase to HEAD as of a few days ago.

Bump the ramdisk size; the longer paths on the build cluster are
likely enough to put this over the edge.

Remove terminfo.db as it's now embedded in libterminfo.

Use the rescue terminfo.db in our images instead of termcap.

Replace references to local and now no-longer-existing termcap files
with references to ${DISTRIBB}/common/termcap.  Hi, abs@!

${NETBSDSRCDIR}/distrib/common/protocols => ${DISTRIBDIR}/common/protocols
${NETBSDSRCDIR}/distrib/common/services => ${DISTRIBDIR}/common/services

Use the cutdown distrib/common/services and distrib/common/protocols
rather than the full fat etc versions

Sync with HEAD.

Since /etc/services has gotten rather large, use a minimal one for install
kernels. (mount_nfs is notably the only binary that doesn't gracefully deal
with the lack of an /etc/services file, it appears.)

Remove "-Wa,-xgot" hack from DBG flag for broken objcopy-crunchide
that has been fixed by simonb.

yet another distrib overhaul:
- move guts of distrib/Makefile.inc to distrib/common/Makefile.distrib
  (fixes problem caused by implicit include of ../Makefile.inc in certain
  submake conditions triggered by makefiles not yet in tree)
- removed mkdir of ${RELEASEDIR}/*;  rely upon "snap_pre" target of
  etc/Makefile to create all the release directories
- renamed RELINSTALL to RELEASE_INSTALL
- renamed FLOPPYINSTDIR to FLOPPY_RELEASEDIR
- renamed MDSETDIR to MDSET_RELEASEDIR
- removed ITARGET
- move release target from top level to appropriate subdirectory
- ensure release target has correct depends
- replace miniroot's IMAGE_MD_POST with common/Makefile.image IMAGEPOSTBUILD
- Makefile.image: add realall: ${IMAGE}

replace _SRC_TOP_ with NETBSDSRCDIR, since the latter is the "public" version

The "objcopy" based crunchide method has a problem on MIPS; it turns global
symbols into locals, but relocs are left in place (rather than attempting
to resolve-in-place with "ld -r", even with "-Bsymbolic").

Standard MIPS code will generate CALL16 relocs for function calls, but
the linker forbids such relocs from being used to call local symbols (such
as those turned "local" by objcopy).  So, rather than battle the toolchain
uphill, work around it for the moment by forcing 32-bit GOT references with
the assembler option "-xgot".

This will be fixed in a more clean manner in the future.

Use ${_SRC_TOP_} instead of ${CURDIR}/../../../

Expand IMAGESIZE to 2.5Mbytes.

Set DBG="-Os -mmemcpy" and also pass it to crunchgen via CRUNCHGEN_FLAGS.
(saves ramdiskbin ~4kbytes)

Set DBG=-Os for libhack.

ensure all sysinst-using makefs generated images have at least 15 inodes free,
and be consistent how MAKEFS_FLAGS is defined.

- Be consistent how libhack is used: If extra HACKOBJS (e.g., gethost.o) are
  required, define them before pulling in libhack/Makefile.inc so that the
  dependencies work correctly.
- Other minor cleanups

minor tweak to IMAGEDEPENDS

Apply patch (requested by he):
  Introduce dependency between ramdisk/miniroot construction and
  osrelease.sh, to better support UPDATE builds of releases.

Disable libhack's gethost.o (replacement gethostby{name,addr}()) by default,
as they only support reading /etc/hosts, and its the "least useful" of
the libhack routines.  Add gethost.o back to Really Small media which
appears to need the space savings.

Remove pwd_mkdb stuff since /etc/passwd file is not needed for install media.
Pointed out by lukem.

- Use new common ramdisk build method.
- Add sysinst, and remove some binaries from list (for now).

Add "release" targets.

use ${HACKOBJS:Ngethost.o} instead of trying to keep HACKOBJS in sync with HACKSRC/Makefile.inc

Use more libhack functions.

- Rename ${SIZE} -> ${RAMDISKSIZE} to avoid conflict with new-toolchain.
- On clean target, try to "make -f ramdiskbin.mk clean" first if it exists.
- Include bsd.prog.mk for new-toolchain.

Add MTREE?= to add Makefiles and use  when running mtree

Use symbol MTREECONF instead of MTREE to refer configuration file
to avoid conflicts.  Pointed out by chs@netbsd.org.

Use libhack.o. (save ~20kbytes)

Change all ocurrences of "crunchgen" to ${CRUNCHGEN}

Use
  ${MAKE}
instead of
  make

use bsd.kernobj.mk to tell us KERNOBJDIR for compiled kernels.

newsmips install floppy.