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build(7): Document KERNBUILDDIR

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KERNBUILDDIR is used by kmod.mk to find the opt_*.h when matching a
kernel to the module. Usually one doesn't need this nob (since most
modules are option invariant or default to the default options everyone
uses), but there are times this generalization doesn't hold.

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Warner Losh 2025-03-07 18:32:58 -07:00
parent 7bd8da72c5
commit 9dc4bcb1a6
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share/man/man7/build.7
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@ -25,7 +25,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd February 3, 2025
.Dd March 8, 2025
.Dt BUILD 7
.Os
.Sh NAME
@ -554,6 +554,13 @@ Overrides which kernel to build and install for the various kernel
make targets.
It defaults to
.Cm GENERIC .
.It Va KERNBUILDDIR
Overrides the default directory to get all the opt_*.h files for
building a kernel module.
Useful for stand-alone modules that depend on
.Xr config 8
options.
Automatically set for modules built with a kernel.
.It Va KERNCONFDIR
Overrides the directory in which
.Va KERNCONF