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Diffstat (limited to 'tools/build/options/WITH_DIRDEPS_BUILD')
| -rw-r--r-- | tools/build/options/WITH_DIRDEPS_BUILD | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/tools/build/options/WITH_DIRDEPS_BUILD b/tools/build/options/WITH_DIRDEPS_BUILD new file mode 100644 index 000000000000..eafe857dd460 --- /dev/null +++ b/tools/build/options/WITH_DIRDEPS_BUILD @@ -0,0 +1,37 @@ +.\" $FreeBSD$ +Enable building in meta mode. +This is an experimental build feature. +For details see +http://www.crufty.net/sjg/docs/freebsd-meta-mode.htm. +.Pp +The build is driven by dirdeps.mk using +.Va DIRDEPS +stored in +Makefile.depend files found in each directory. +.Pp +The build can be started from anywhere, and behaves the same. +The initial instance of +.Xr make 1 +recursively reads +.Va DIRDEPS +from Makefile.depend +computing a graph of tree dependencies from the current origin. +Setting +.Va NO_DIRDEPS +will skip checking dirdep dependencies and will only build in 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. +.Pp +The build will hide commands ran unless +.Va NO_SILENT +is defined. +.Pp |