Changes since 20181221 are mostly portability related
hence the large gap in versions imported.
There are however some bug fixes, and a rework of filemon handling.
In NetBSD make/filemon/filemon_ktrace.c allows use of fktrace
and elimination of filemon(4) which has not had the TLC it needs.
FreeBSD filemon(4) is in much better shape, so bmake/filemon/filemon_dev.c
allows use of that, with a bit less overhead than the ktrace model.
Summary of changes from ChangeLog
o str.c: empty string does not match % pattern
plus unit-test changes
o var.c: import handling of old sysV style modifier using '%'
o str.c: refactor brk_string
o meta.c: meta_oodate, CHECK_VALID_META is too aggressive for CMD
a blank command is perfectly valid.
o meta.c: meta_oodate, check for corrupted meta file
earlier and more often.
* meta.c: meta_compat_parent check for USE_FILEMON
patch from Soeren Tempel
o meta.c: fix compat mode, need to call meta_job_output()
o job.c: extra fds for meta mode not needed if using filemon_dev
o meta.c: avoid passing NULL to filemon_*() when meta_needed()
returns FALSE.
o filemon/filemon_{dev,ktrace}.c: allow selection of
filemon implementation. filemon_dev.c uses the kernel module
while filemon_ktrace.c leverages the fktrace api available in
NetBSD. filemon_ktrace.c can hopefully form the basis for
adding support for other tracing mechanisms such as strace on
Linux.
o meta.c: when target is out-of-date per normal make rules
record value of .OODATE in meta file.
o parse.c: don't pass NULL to realpath(3)
some versions cannot handle it.
o parse.c: ParseDoDependency: free paths rather than assert
plus more unit-tests
Archive member handling works again
meta mode, treat missing reads as for writes.
Update dirdeps.mk - much improved startup time.
Update meta.stage.mk - avoid ln when chmod required.
Only change to bmake is man page - document .OBJDIR target.
We also get latest dirdeps.mk and friends.
> Description of fields to fill in above: 76 columns --|
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> Differential Revision: https://reviews.freebsd.org/D### (*full* phabric URL needed).
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_M contrib/bmake
M contrib/bmake/ChangeLog
M contrib/bmake/Makefile
M contrib/bmake/bmake.1
M contrib/bmake/bmake.cat1
M contrib/bmake/make.1
M contrib/bmake/mk/ChangeLog
M contrib/bmake/mk/dirdeps.mk
M contrib/bmake/mk/gendirdeps.mk
M contrib/bmake/mk/install-mk
M contrib/bmake/mk/meta.stage.mk
M contrib/bmake/mk/meta.sys.mk
M contrib/bmake/mk/mkopt.sh
M contrib/bmake/targ.c
M usr.bin/bmake/Makefile
