1 files changed, 47 insertions, 0 deletions
diff --git a/share/mk/bsd.symver.mk b/share/mk/bsd.symver.mk
new file mode 100644
index 000000000000..7626274e59a5
--- /dev/null
+++ b/share/mk/bsd.symver.mk
@@ -0,0 +1,47 @@
+# $FreeBSD$
+
+.if !target(__<bsd.symver.mk>__)
+__<bsd.symver.mk>__:
+
+.include <bsd.init.mk>
+
+# Generate the version map given the version definitions
+# and symbol maps.
+.if ${MK_SYMVER} == "yes" && !empty(VERSION_DEF) && !empty(SYMBOL_MAPS)
+# Find the awk script that generates the version map.
+VERSION_GEN?=	version_gen.awk
+VERSION_MAP?=	Version.map
+
+CLEANFILES+=	${VERSION_MAP}
+
+# Compute the make's -m path.
+_mpath=
+_oarg=
+.for _arg in ${.MAKEFLAGS}
+.if ${_oarg} == "-m"
+_mpath+= ${_arg}
+.endif
+_oarg=  ${_arg}
+.endfor
+_mpath+= /usr/share/mk
+
+# Look up ${VERSION_GEN} in ${_mpath}.
+_vgen=
+.for path in ${_mpath}
+.if empty(_vgen)
+.if exists(${path}/${VERSION_GEN})
+_vgen=  ${path}/${VERSION_GEN}
+.endif
+.endif
+.endfor
+.if empty(_vgen)
+.error ${VERSION_GEN} not found in the search path.
+.endif
+
+# Run the symbol maps through the C preprocessor before passing
+# them to the symbol version generator.
+${VERSION_MAP}: ${VERSION_DEF} ${_vgen} ${SYMBOL_MAPS}
+	cat ${SYMBOL_MAPS} | ${CPP} - - \
+	    | awk -v vfile=${VERSION_DEF} -f ${_vgen} > ${.TARGET}
+.endif	# !empty(VERSION_DEF) && !empty(SYMBOL_MAPS)
+.endif  # !target(__<bsd.symver.mk>__)