For PROGS this was recursing twice since MAKELEVEL0 is for 'dirdeps'
which then really builds in a sub-make.
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The "files" staging name is not the same as "bsd.files.mk" but seems to just be
a group of extra files that are not the essential includes or libraries, which
include .
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'buildconfig' is connected to 'all', but 'installconfig' is only called
manually. There is not much need to conditionalize this file right
now due to how it is hooked up and its impact on various build phases.
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Before this, if a file was installed to DESTDIR/some/dir and that directory
was missing due to not having ran 'make distrib-dirs' yet, the file would
be installed as 'some/dir'. For something like bsd.incs.mk with INCLUDEDIR
being a sub-directory of /usr/include, this could result in all of the headers
being installed to a file rather than getting a directory of them.
Now it will error that the file/directory does not exist rather than hide
the issue.
Another option being discussed is to implement GNU's install -D flag which
would auto create any missing directories.
This is a mitigation of the problem. The proper order to the build is to
run 'make distrib-dirs' first, but that can be forgotten if building from
a sub-directory after updating the source code to the latest revision.
MFC after: 2 weeks
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more typical ALL_SUBDIR_TARGETS entries and target hooks in bsd.incs.mk,
bsd.files.mk and bsd.confs.mk.
This allows the targets to be NOPs if unneeded and still work with the
shortcut 'make includes' to build and then install in a parallel-safe manner.
Sort and re-indent the ALL_SUBDIR_TARGETS with the new entries.
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