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-rw-r--r--sys/conf/kmod.mk23
1 files changed, 21 insertions, 2 deletions
diff --git a/sys/conf/kmod.mk b/sys/conf/kmod.mk
index 645c04cdd135..0fd2d4050cf1 100644
--- a/sys/conf/kmod.mk
+++ b/sys/conf/kmod.mk
@@ -303,6 +303,25 @@ all: ${PROG}
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 @@ beforebuild: ${_ILINKS}
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