2015-11-14 03:24:48 +00:00
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.\" $FreeBSD$
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Enable building in meta mode.
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This is an experimental build feature.
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For details see
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http://www.crufty.net/sjg/docs/freebsd-meta-mode.htm.
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.Pp
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The build is driven by dirdeps.mk using
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.Va DIRDEPS
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stored in
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Makefile.depend files found in each directory.
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.Pp
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The build can be started from anywhere, and behaves the same.
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The initial instance of
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.Xr make 1
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recursively reads
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.Va DIRDEPS
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from Makefile.depend
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computing a graph of tree dependencies from the current origin.
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Setting
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.Va NO_DIRDEPS
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will skip checking dirdep dependencies and will only build in the current
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2016-04-12 03:37:42 +00:00
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and child directories.
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.Va NO_DIRDEPS_BELOW
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will skip building any dirdeps and only build the current directory.
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2015-11-14 03:24:48 +00:00
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.Pp
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As each target is made
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.Xr make 1
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produces a meta file which is used to capture (and compare)
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the command line,
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as well as any command output.
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If
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.Xr filemon 4
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is available the meta file will also capture a record of files
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used to produce the target by tracking syscalls.
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.Pp
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The build will hide commands ran unless
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.Va NO_SILENT
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is defined.
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.Pp
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