CVS log for src/sys/conf/copts.mk

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Pull up following revision(s) (requested by rin in ticket #739):

	sys/net/zlib.c: revision 1.39
	sys/conf/copts.mk: revision 1.12 (patch)

net/zlib.c: Add apparent /* FALLTHROUGH */'s to appease compilers
Ideas from t-kusaba at iij, thanks!

sys/conf/copts.mk: Drop fallthrough hack for zlib.c

sys/conf/copts.mk: Drop fallthrough hack for zlib.c

introduce new GCC 12 warning disables and use them in a few places

this introduces 4 new warning disable flags:

   CC_WNO_MISSING_TEMPLATE_KEYWORD
   CC_WNO_REGISTER
   CC_WNO_STRINGOP_OVERREAD
   CC_WNO_ARRAY_BOUNDS

and documents them in README.warnings.  of these, the string op
and array bounds are both problematic (real bugs) and also spurious
(not real bugs), and the other 2 are mostly temporary for older
3rd party code.

add some new uses of CC_WNO_STRINGOP_OVERFLOW.

fix m68k build for gallium and GCC 12.

adapt to ${CC_WNO_IMPLICIT_FALLTHROUGH}

Use ${CC_WNO_IMPLICIT_FALLTHROUGH} instead of
the older style more complex expressions.

bsd.own.mk: rename GCC_NO_* to CC_WNO_*

Rename compiler-warning-disable variables from
	GCC_NO_warning
to
	CC_WNO_warning
where warning is the full warning name as used by the compiler.

GCC_NO_IMPLICIT_FALLTHRU is CC_WNO_IMPLICIT_FALLTHROUGH

Using the convention CC_compilerflag, where compilerflag
is based on the full compiler flag name.

bsd.own.mk: rename to CC_WNO_ADDRESS_OF_PACKED_MEMBER

Provide a single variable
	CC_WNO_ADDRESS_OF_PACKED_MEMBER
with options for both clang and gcc, to replace
	CLANG_NO_ADDR_OF_PACKED_MEMBER
	CC_NO_ADDR_OF_PACKED_MEMBER
	GCC_NO_ADDR_OF_PACKED_MEMBER

Using the convention CC_compilerflag, where compilerflag
is based on the full compiler flag name.

sys/conf: fix typo in comment

Sync with HEAD.

new GCC_NO_* uses for warning issues.  most of the users of the new
GCC_NO_RETURN_LOCAL_ADDR are bugs in GCC itself, not the code.

Mostly merge changes from HEAD upto 20200411

Merge changes from current as of 20200406

XXX:

turn off -Wunused-but-set-variable for mips' linux_machdep.c and GCC 8.

convert HAVE_GCC == 7 to HAVE_GCC >= 7.

Sync with HEAD

file copts.mk was added on branch phil-wifi on 2019-06-10 22:07:04 +0000

mark pf.c, radeon_cs.c and via_dmablit.c for no fall thru error.

this was already done in the various modules, but not in the main
kernel.

be sure to only apply zlib.c's -Wno-error=implicit-fallthrough to GCC 7.
push the setting into the rump and module version too.

pass -Wno-error=implicit-fallthrough for zlib.c.

XXX: consider using copts.mk for various warning/copt flags passed
in kernel builds currently set via 'makeoptions' in files.* files.
this is suboptimal, as those all get embedded into the kernel with
config_file.h.