CVS log for src/usr.bin/make/meta.h

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make: mark several functions whose result must be used

Suggested by sjg, to catch more bugs like the memory leak in cond.c
1.303 from 2021-12-13.

No binary change.

make: use C99 bool type instead of defining its own

No functional change.

make(1): split JobFlags into separate fields

Having all these flags in a single bitmask makes it harder to see where
exactly they can possibly be used since their state could also be
modified using the unsuspicious job->flags = 0.  Using individual names
just leaves the single memset, and that is only used during
initialization.

make(1): clean up headers, no functional change

make(1): remove trailing whitespace

Merge changes from current as of 20200406

Reimplement make(1) meta mode without filemon(4).

Propagate errors from filemon.

If we encounter errors producing a .meta file,
we should not consider the target completed successfully.

str2Lst_Append tokenizes the string and uses it in the list so we can't
free the string afterwards. Keep a copy of it and cleanup at the end.

sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs.  ("Protocol error: too many arguments")

resync from head

If built with filemon support, set .MAKE.PATH_FILEMON to _PATH_FILEMON
so that makefiles can test for it.

Add NetBSD tags

Add meta.c which implements "meta" mode for make.
In this mode, a .meta file is created for each target, capturing
the expanded commands used, any command output, and if filemon(9)
is available, a record of system calls which are of interest.
Not enabled unless USE_META=yes is set when building make.
Also, if FILEMON_H exists, meta.c will be compiled to use filemon(9).