Always use arm-elf2aout; no a.out support both for binutils{,.old}

branches: 1.27.30;
Switch to arm-elf2aout from objcopy since new binutils don't support a.out
anymore.

branches: 1.26.16; 1.26.18;
Define ${LINKSCRIPT} in one place.

Write the rule of ldscript generation.

Put -fno-unwind-tables into CFLAGS instead of COPTS - the old version caused
DEFCOPTS not to be propagated into COPTS, which means no optimization
for the kernel - ooops!

branches: 1.23.2;
Explicitly set LOADADDRESS, the linker script hack is overriden by
command line arguments now.

Set dependency via KERNLDSCRIPT. Don't touch SYSTEM_DEP from outside.

Use LINKSCRIPT.

Missing dependency on ldscript files.

branches: 1.19.4;
Re-add -fno-unwind-tables, otherwise eabi kernels fail to boot (bug in
objcopy?)

Do not explicitly prevent unwind table generation

Do not output unwind tables, they make no sense for the kernel.
Do not force MACHINE=arm, to allow building eabi kernels with MACHINE=earmv4

branches: 1.16.2; 1.16.12; 1.16.16;
Use common ${OBJCOPY_ELF2AOUT_FLAGS}.

Remove an extra backslash.

also need to strip out GCC 4.5's new .debug_pubtypes section.
while here, minor cleanup.

remove almost all the ability to build netbsd with an a.out target.
we're ELF now, and there are many missing checks against OBJECT_FMT.
if we ever consider switching, the we can figure out what new ones
we need but for now it's just clutter.

this doesn't remove any of the support for exec_aout or any actually
required-for-boot a.out support, only the ability to build a netbsd
release in a.out format. ie, most of this code has been dead for
over a decade.

i've tested builds on vax, amd64, i386, mac68k, macppc, sparc, atari,
amiga, shark, cats, dreamcast, landisk, mmeye and x68k. this covers
the 5 MACHINE_ARCH's affected, and all the other arch code touched.
it also includes some actual run-time testing of sparc, i386 and
shark, and i performed binary comparison upon amiga and x68k as well.


some minor details relevant:
- move shlib.[ch] from ld.aout_so into ldconfig proper, and cut them
down to only the parts ldconfig needs
- remove various unused source files
- switch amiga bootblocks to using elf2bb.h instead of aout2bb.h

branches: 1.12.2; 1.12.4;
More sections to remove when doing ELF->a.out conversion.

Something, somewhere has started emitting a number of new ELF sections,
and these need to be removed when objcompying to netbsd.aout. The new
ones were .debug_frame, .debug_loc, .debug_pubnames, and .debug_aranges.

branches: 1.10.6; 1.10.8; 1.10.10; 1.10.12;
Remove the debugging sections too when converting from an ELF
to an a.out file, after the addition of the "debugging always
included" file added recently.

branches: 1.9.6;
Remove the .note section when creating the a.out kernel image.

branches: 1.8.14; 1.8.16; 1.8.18; 1.8.20; 1.8.24; 1.8.26;
Install both netbsd and netbsd.aout into / when running a "make install" in
the kernel's compilation directory.

Fixes PR port-shark/17569.

branches: 1.7.2;
Move mkldscript.sh, which is used to create ldscript dynamically to
merge link_set_* sections into the text section for a.out kernels,
from sys/arch/arm/conf/ to sys/conf/ since there is no ARM specific
stuff in it and other ports would share it.

branches: 1.6.24; 1.6.26; 1.6.30;
. Have dbsym explicitly suggest increasing SYMTAB_SPACE when
an overflow occurs.
. Make this error a fatal build time error
. Move the support for dbsym into the MI Makefile.kern.inc,
conditional upon the SYMTAB_SPACE option being defined in
the kernel config file.

branches: 1.5.12; 1.5.18;
work around a binutils bug where converting ELF kernels to a.out with objcopy
produces corrupted binaries when the link_set_* sections extend into another
page after the end of the .text section by using a generated an ldscript that
puts all the link_set_* data into the .text section in the first place.

branches: 1.4.2;
For GCC 3.3.1, need to remove .comment too.

branches: 1.3.2;
Don't define -D${MACHINE} in Makefile.arm. Instead, let platforms
that care define it themselves. Note that evbarm NO LONGER defines
-D${MACHINE}.

Use a linker script to craft and ELF image that will work
when copied to a.out via objcopy. Stop using that frightening
elf2aout.sh shell script.

branches: 1.1.2; 1.1.12; 1.1.14;
Kill arch/arm32. The last platform supported there, Shark, is now
in arch/shark.

(NOTE: arch/dnard, a premature move to split out the Shark support
code, is going to be deleted. It has bit-rotted.)