51 lines
1.3 KiB
Plaintext
51 lines
1.3 KiB
Plaintext
Create
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.Xr make 1
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meta files when building, which can provide a reliable incremental build when
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using
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.Xr filemon 4 .
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The meta file is created in OBJDIR as
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.Pa target.meta .
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These meta files track the command that was executed, its output, and the
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current directory.
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The
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.Xr filemon 4
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module is required unless
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.Va NO_FILEMON
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is defined.
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When the module is loaded, any files used by the commands executed are
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tracked as dependencies for the target in its meta file.
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The target is considered out-of-date and rebuilt if any of these
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conditions are true compared to the last build:
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.Bl -bullet -compact
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.It
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The command to execute changes.
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.It
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The current working directory changes.
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.It
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The target's meta file is missing.
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.It
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The target's meta file is missing filemon data when filemon is loaded
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and a previous run did not have it loaded.
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.It
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[requires
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.Xr filemon 4 ]
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Files read, executed or linked to are newer than the target.
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.It
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[requires
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.Xr filemon 4 ]
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Files read, written, executed or linked are missing.
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.El
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The meta files can also be useful for debugging.
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.Pp
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The build hides commands that are executed unless
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.Va NO_SILENT
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is defined.
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Errors cause
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.Xr make 1
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to show some of its environment for further debugging.
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.Pp
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The build operates as it normally would otherwise.
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This option originally invoked a different build system but that was renamed
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to
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.Va WITH_DIRDEPS_BUILD .
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