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Add more content for WITH_META_MODE/WITH_DIRDEPS_BUILD.

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Sponsored by:	EMC / Isilon Storage Division
This commit is contained in:
Bryan Drewery 2016-04-14 22:00:49 +00:00
parent 473fda75dd
commit f43bc6d18d
2 changed files with 41 additions and 16 deletions
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20
tools/build/options/WITH_DIRDEPS_BUILD
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@ -1,9 +1,9 @@
.\" $FreeBSD$
Enable building in meta mode.
This is an experimental build feature.
This is an experimental build system.
For details see
http://www.crufty.net/sjg/docs/freebsd-meta-mode.htm.
.Pp
Build commands can be seen from the top-level with:
.Dl make show-valid-targets
The build is driven by dirdeps.mk using
.Va DIRDEPS
stored in
@ -23,17 +23,13 @@ and child directories.
.Va NO_DIRDEPS_BELOW
will skip building any dirdeps and only build the current directory.
.Pp
As each target is made
.Xr make 1
produces a meta file which is used to capture (and compare)
the command line,
as well as any command output.
If
.Xr filemon 4
is available the meta file will also capture a record of files
used to produce the target by tracking syscalls.
This also utilizes the
.Va WITH_META_MODE
logic for incremental builds.
.Pp
The build will hide commands ran unless
.Va NO_SILENT
is defined.
.Pp
Note that there is currently no mass install feature for this.
.Pp

37
tools/build/options/WITH_META_MODE
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@ -1,12 +1,41 @@
.\" $FreeBSD$
Create meta files when not doing DIRDEPS_BUILD.
Creates
.Xr make 1
meta files when building, which can provide a reliable incremental build when
using
.Xr filemon 4 .
The meta file is created in the OBJDIR as
.Pa target.meta .
These meta files track the command ran, its output, and the current directory.
When the
.Xr filemon 4
module is loaded, dependencies will be tracked for all commands.
If any command, its dependencies, or files it generates are missing then
the target will be considered out-of-date and rebuilt.
module is loaded, any files used by the commands executed will be tracked as
dependencies for the target in its meta file.
The target will be considered out-of-date and rebuilt if any of the following
are true compared to the last build:
.Bl -bullet -compact
.It
The command to execute changes.
.It
The current working directory changes.
.It
The target's meta file is missing.
.It
[requires
.Xr filemon 4 ]
Files read, executed or linked to are newer than the target.
.It
[requires
.Xr filemon 4 ]
Files read, written, executed or linked are missing.
.El
The meta files can also be useful for debugging.
.Pp
The build will hide commands ran unless
.Va NO_SILENT
is defined.
.Pp
The build operates as it normally would otherwise.
This option originally invoked a different build system but that was renamed
to
.Va WITH_DIRDEPS_BUILD .