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diff --git a/Makefile.inc1 b/Makefile.inc1
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -1051,7 +1051,7 @@
METALOG_SORT_CMD= env -i LC_COLLATE=C sort
# kernel stage
-KMAKEENV= ${WMAKEENV:NSYSROOT=*}
+KMAKEENV= ${WMAKEENV}
KMAKE= ${TIME_ENV} ${KMAKEENV} ${MAKE} ${.MAKEFLAGS} ${KERNEL_FLAGS} KERNEL=${INSTKERNNAME}
#
diff --git a/sys/conf/kern.post.mk b/sys/conf/kern.post.mk
--- a/sys/conf/kern.post.mk
+++ b/sys/conf/kern.post.mk
@@ -372,6 +372,19 @@
_ILINKS+= i386
.endif
+.if ${MK_REPRODUCIBLE_BUILD} != "no"
+PREFIX_SYSDIR=/usr/src/sys
+PREFIX_OBJDIR=/usr/obj/usr/src/${MACHINE}.${MACHINE_CPUARCH}/sys/${KERN_IDENT}
+CFLAGS+= -ffile-prefix-map=${SYSDIR}=${PREFIX_SYSDIR}
+CFLAGS+= -ffile-prefix-map=${.OBJDIR}=${PREFIX_OBJDIR}
+.if defined(SYSROOT)
+CFLAGS+= -ffile-prefix-map=${SYSROOT}=/sysroot
+.endif
+.else
+PREFIX_SYSDIR=${SYSDIR}
+PREFIX_OBJDIR=${.OBJDIR}
+.endif
+
# Ensure that the link exists without depending on it when it exists.
# Ensure that debug info references the path in the source tree.
.for _link in ${_ILINKS}
@@ -379,9 +392,9 @@
${SRCS} ${DEPENDOBJS}: ${_link}
.endif
.if ${_link} == "machine"
-CFLAGS+= -fdebug-prefix-map=./machine=${SYSDIR}/${MACHINE}/include
+CFLAGS+= -fdebug-prefix-map=./machine=${PREFIX_SYSDIR}/${MACHINE}/include
.else
-CFLAGS+= -fdebug-prefix-map=./${_link}=${SYSDIR}/${_link}/include
+CFLAGS+= -fdebug-prefix-map=./${_link}=${PREFIX_SYSDIR}/${_link}/include
.endif
.endfor
diff --git a/sys/conf/kmod.mk b/sys/conf/kmod.mk
--- a/sys/conf/kmod.mk
+++ b/sys/conf/kmod.mk
@@ -303,6 +303,25 @@
beforedepend: ${_ILINKS}
beforebuild: ${_ILINKS}
+.if ${MK_REPRODUCIBLE_BUILD} != "no"
+PREFIX_SYSDIR=/usr/src/sys
+CFLAGS+= -ffile-prefix-map=${SYSDIR}=${PREFIX_SYSDIR}
+.if defined(KERNBUILDDIR)
+PREFIX_KERNBUILDDIR=/usr/obj/usr/src/${MACHINE}.${MACHINE_CPUARCH}/sys/${KERNBUILDDIR:T}
+PREFIX_OBJDIR=${PREFIX_KERNBUILDDIR}/modules/usr/src/sys/modules/${.OBJDIR:T}
+CFLAGS+= -ffile-prefix-map=${KERNBUILDDIR}=${PREFIX_KERNBUILDDIR}
+.else
+PREFIX_OBJDIR=/usr/obj/usr/src/${MACHINE}.${MACHINE_CPUARCH}/sys/modules/${.OBJDIR:T}
+.endif
+CFLAGS+= -ffile-prefix-map=${.OBJDIR}=${PREFIX_OBJDIR}
+.if defined(SYSROOT)
+CFLAGS+= -ffile-prefix-map=${SYSROOT}=/sysroot
+.endif
+.else
+PREFIX_SYSDIR=${SYSDIR}
+PREFIX_OBJDIR=${.OBJDIR}
+.endif
+
# Ensure that the links exist without depending on it when it exists which
# causes all the modules to be rebuilt when the directory pointed to changes.
# Ensure that debug info references the path in the source tree.
@@ -311,9 +330,9 @@
OBJS_DEPEND_GUESS+= ${_link}
.endif
.if ${_link} == "machine"
-CFLAGS+= -fdebug-prefix-map=./machine=${SYSDIR}/${MACHINE}/include
+CFLAGS+= -fdebug-prefix-map=./machine=${PREFIX_SYSDIR}/${MACHINE}/include
.else
-CFLAGS+= -fdebug-prefix-map=./${_link}=${SYSDIR}/${_link}/include
+CFLAGS+= -fdebug-prefix-map=./${_link}=${PREFIX_SYSDIR}/${_link}/include
.endif
.endfor

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