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.

introduce some common variables for use in GCC warning disables:

GCC_NO_FORMAT_TRUNCATION -Wno-format-truncation (GCC 7/8)
GCC_NO_STRINGOP_TRUNCATION -Wno-stringop-truncation (GCC 8)
GCC_NO_STRINGOP_OVERFLOW -Wno-stringop-overflow (GCC 8)
GCC_NO_CAST_FUNCTION_TYPE -Wno-cast-function-type (GCC 8)

use these to turn off warnings for most GCC-8 complaints. many
of these are false positives, most of the real bugs are already
commited, or are yet to come.


we plan to introduce versions of (some?) of these that use the
"-Wno-error=" form, which still displays the warnings but does
not make it an error, and all of the above will be re-considered
as either being "fix me" (warning still displayed) or "warning
is wrong."

branches: 1.23.32;
Remove many HAVE_GCC || HAVE_PCC conditionals as the options also apply
to Clang. Add a few cases of HAVE_LLVM for -fno-strict-aliasing.

branches: 1.22.2;
remove most of the remaining HAVE_GCC tests that are always true in
the modern world.

branches: 1.21.18;
Refine previous: can put the main -> mymain thing in the .x file, which is
both tidier and also doesn't break update builds.

Enable the code that reads /etc/pcnfsd.conf. It was disabled because
rpcgen offers no mechanism to call it from the rpcgen-created main().
So, use the preprocessor to rename that mymain() and provide another
main() that loads the config file first.

PR bin/12758.

Fix the Title of manual page so it our official name (rpc.pcnfsd).
Install so first file installed matches this correct manual page
name.

(Both manual pages are still installed. And only rpc.pcnfsd binary is
installed. So no change.)

Wrap compiler-specific flags with HAVE_GCC and HAVE_PCC as necessary. Add a few flags for PCC.

branches: 1.17.20;
sprinkle some -fno-strict-aliasing and -Wno-pointer-sign with GCC4.

remove unnecessary dependency now that bsd.rpc.mk adds to DPSRCS

Use <bsd.rpc.mk>

Resolve rpcgen's path in a way that works with other shells.

welcome to the 20th century; use logwtmp{,x}; don't write to /var/adm/wtmp!

branches: 1.12.2;
Split the notion of building Hesiod, Kerberos, S/key, and YP
infrastructure and using that infrastructure in programs.

* MKHESIOD, MKKERBEROS, MKSKEY, and MKYP control building
of the infratsructure (libraries, support programs, etc.)

* USE_HESIOD, USE_KERBEROS, USE_SKEY, and USE_YP control
building of support for using the corresponding API
in various libraries/programs that can use it.

As discussed on tech-toolchain.

No need to invoke extra shell.

Run make in compat mode while evaluating rhs of != op.

use expr to do subtraction. shell math isn't as portable.

Make targets which are generated with rpcgen depend on the rpcgen binary.

${RPCGEN}, not hard-coded rpcgen

use CPPFLAGS instead of CFLAGS

branches: 1.5.2;
enable WARNS=1 by default, but disable in unclean 3rd party code

Makefile cleanups

Add the NetBSD ID strings.

make work regardless of 'obj', do dependencies a bit better

gwr's port of pcnfsd