deal with PIE and SSP

branches: 1.31.2;
Add a few includes of bsd.own.mk to avoid broken test conditions
on ACTIVE_CC - this might not be the correct fix for PR 50930,
but it avoids the issue.

When building with clang, optimise for minimal size and skip frame
pointers when possible.

branches: 1.29.6;
Build boot loaders without unwind tables.

branches: 1.28.8; 1.28.18; 1.28.22;
factor out the floppy detection code.

Introduce .WAIT into the cleandir rule for blasting the libsa/libkern/etc.
trees, because it can race with the libsa/libkern/etc. makefiles' own
cleandir rules. I think I've found all of the uses of the offending idiom...
Closes PR 43360.

branches: 1.26.2; 1.26.4;
Add src/common/include to -Ipath for proplib(3) so that build works
even without installed DESTDIR.

Use <bsd.klinks.mk> to create machine and ${MACHINE_ARCH} symlinks.

- use -Os to shrink bianries
- remove local shrinked memcpy() from bootxx.c bacause
now it's identical with __OPTIMIZE_SIZE__ libsa one
derived from src/common/lib/libc/string/bcopy.c.

Tested netboot from le0 and bootxx + boot from sd0 on SS1+.

branches: 1.23.78; 1.23.86; 1.23.92;
merge ktrace-lwp.

Ignore errors on some rm -rf's for platforms that aren't quite
POSIX compliant
and return errors on r/o source (FreeBSD) for -rf. Fixes PR#25022

branches: 1.21.2;
sprinkle some: libkern.h, some -ffreestanding and some cast-y goodness,
all for the pleasure of the gcc 3 :-)

branches: 1.20.2;
Make sure to remove lib directories.

Add support for large kernels by searching for a physical memory segment
to fit it in. As a bonus, the kernel is now also mapped to the virtual
address (i.e. KERNBASE) it is linked at.

make sparc64 friendly.

branches: 1.17.8;
MKfoo=no -> NOfoo

Don't make the symlinks on clean rules as well as obj rules. Breaks r/o source
trees that haven't gotten to the make obj recursion part of make build
otherwise.

branches: 1.15.4; 1.15.8;
Change the relocation address of `boot' once again to steer clear of
memory used by the PROM on sun4 and early sun4c machines.

Change to relocation addresses that currently work on all machines.
boot programs at alternative addresses no longer built and installed
by default.

Pull down from 1.4 branch: default relocation address = 3E0000

branches: 1.12.4;
SUN_BOOTPARAM compile-time option is no longer used.

bootxx links at 0x340000
2nd-stage boot programs choices: 0x200000,0x300000,0x400000,0x700000 (default: 0x300000)

Build several versions of the second-stage boot program, each linked
to run at a different base address. Boot image build procedures can
pick one which is least likely to fail..

The default boot program is again build to run at 0x340000.

Clean up the machine symlink stuff ever so slightly. Needs to be
standardized between files.

Suppress the `machine' symlink when making target `obj'.
Also add it to the clean target list.

branches: 1.7.2; 1.7.8;
Initialize the heap (for alloc()) explicitly, since the `end' symbol
is not necessarily double-word aligned.

Checkpoint of elf boot stuff:
- Use loadfile for both boot and installboot
- Fix problems with linking in bootxx
- Make installboot work with both a.out and ELF bootxx
- *WILL NOT BOOT YET ELF KERNELS* (a.out kernels work) I am working on it.

branches: 1.5.2; 1.5.4;
Install the `machine' link again; it went missing a while ago.
Add `-I.' to CPPFLAGS to use it.

* Add promlib.c to common sources.
* Compile with prototype warnings turned on.

convert from NOxxx= to MKxxx=no.
include <bsd.own.mk> if testing a MKxxx variable.

Define _STANDALONE instead of STANDALONE.

Completely rearrange SPARC boot code, modeling it after alpha and hp300
ports' boot programs. Also added support for loading gzip'd kernels,
useful for booting from floppy. From Jason R. Thorpe <thorpej@nas.nasa.gov>,
tested by Matthew Green <mrg@eterna.com.au> and Erik Fair <fair@clock.org>.