The branch main has been updated by imp:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=e8dca53aa06ed7a06a83e666c4c303692f8fdbbe

commit e8dca53aa06ed7a06a83e666c4c303692f8fdbbe
Author:     Warner Losh <[email protected]>
AuthorDate: 2021-06-02 16:35:01 +0000
Commit:     Warner Losh <[email protected]>
CommitDate: 2021-06-02 16:39:58 +0000

    kmod.mk: Allow extra objects to be specified in modules
    
    OBJS are automatically added to CLEANFILES. For pre-built objects, this
    is not desirable since it will delete the object from the source
    tree. Introduce EXTRA_OBJS which list these object files, but aren't
    added to clean files.
    
    Sponsored by:           Netflix
    Reviewed by:            emaste@
    Differential Revision:  https://reviews.freebsd.org/D30615
---
 sys/conf/kmod.mk | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/sys/conf/kmod.mk b/sys/conf/kmod.mk
index c0d4441af029..c0ad352bf625 100644
--- a/sys/conf/kmod.mk
+++ b/sys/conf/kmod.mk
@@ -44,10 +44,12 @@
 #
 # DESTDIR      The tree where the module gets installed. [not set]
 #
-# KERNBUILDDIR
-#              Set to the location of the kernel build directory where
+# KERNBUILDDIR Set to the location of the kernel build directory where
 #              the opt_*.h files, .o's and kernel winds up.
 #
+# BLOB_OBJS    Prebuilt binary blobs .o's from the src tree to be linked into
+#              the module. These are precious and not removed in make clean.
+#
 # +++ targets +++
 #
 #      install:
@@ -241,14 +243,14 @@ LDSCRIPT_FLAGS?= -T 
${SYSDIR}/conf/ldscript.kmod.${MACHINE_ARCH}
 .endif
 
 .if ${__KLD_SHARED} == yes
-${KMOD}.kld: ${OBJS}
+${KMOD}.kld: ${OBJS} ${BLOB_OBJS}
 .else
-${FULLPROG}: ${OBJS}
+${FULLPROG}: ${OBJS} ${BLOB_OBJS}
 .endif
        ${LD} -m ${LD_EMULATION} ${_LDFLAGS} ${LDSCRIPT_FLAGS} -r -d \
-           -o ${.TARGET} ${OBJS}
+           -o ${.TARGET} ${OBJS} ${BLOB_OBJS}
 .if ${MK_CTF} != "no"
-       ${CTFMERGE} ${CTFFLAGS} -o ${.TARGET} ${OBJS}
+       ${CTFMERGE} ${CTFFLAGS} -o ${.TARGET} ${OBJS} ${BLOB_OBJS}
 .endif
 .if defined(EXPORT_SYMS)
 .if ${EXPORT_SYMS} != YES
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