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diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -155,6 +155,7 @@
TGTS= all all-man buildenv buildenvvars buildetc buildkernel buildworld \
check check-old check-old-dirs check-old-files check-old-libs \
+ check-symbols \
checkdpadd checkworld clean cleandepend cleandir cleankernel \
cleanworld cleanuniverse \
delete-old delete-old-dirs delete-old-files delete-old-libs \
diff --git a/share/mk/bsd.lib.mk b/share/mk/bsd.lib.mk
--- a/share/mk/bsd.lib.mk
+++ b/share/mk/bsd.lib.mk
@@ -375,6 +375,38 @@
${SHLIB_NAME}.debug: ${SHLIB_NAME_FULL}
${OBJCOPY} --only-keep-debug ${SHLIB_NAME_FULL} ${.TARGET}
.endif
+
+CLEANFILES+= ${SHLIB_NAME}.symbols
+${SHLIB_NAME}.symbols: ${SHLIB_NAME_FULL}
+ (printf "%sgenerated by bsd.lib.mk\n" @; \
+ objdump -T ${.ALLSRC} | grep -v '\*UND\*' | cut -f 2 | grep '^0' | \
+ sed -e 's/^[0-9a-z]* *//' | \
+ awk '{ if ($$2 == "") { print $$1 " <unversioned>" } else if ($$3 == "") { print $$2 " " $$1 } else { print $$3 " " $$1 } }' | \
+ sort) > ${.TARGET}
+
+.if defined(SYMBOLS_REF_MD)
+_SYMBOLS_REF_ARCH=-${MACHINE_ARCH}
+.else
+_SYMBOLS_REF_ARCH=
+.endif
+SYMBOLS_REF?= ${.CURDIR}/${SHLIB_NAME}.symref${_SYMBOLS_REF_ARCH}
+.if ${.TARGETS:Mcheck-symbols}
+_CHECK_SYMBOLS_WARNING?=echo
+.else
+_CHECK_SYMBOLS_WARNING?=true
+.endif
+check-symbols: ${SHLIB_NAME}.symbols
+ @if [ ! -e ${SYMBOLS_REF} ]; then \
+ ${_CHECK_SYMBOLS_WARNING} "WARNING: no symbol reference (${SYMBOLS_REF:T}), run 'make update-symref'" 1>&2; \
+ else \
+ if ! diff ${SYMBOLS_REF} ${SHLIB_NAME}.symbols; then \
+ echo "ERROR: symbol set changed, correct or run 'make update-symref'" 1>&2; \
+ false; \
+ fi \
+ fi
+
+update-symref: ${SHLIB_NAME}.symbols
+ cp ${SHLIB_NAME}.symbols ${SYMBOLS_REF}
.endif #defined(SHLIB_NAME)
.if defined(INSTALL_PIC_ARCHIVE) && defined(LIB) && !empty(LIB)
diff --git a/share/mk/bsd.subdir.mk b/share/mk/bsd.subdir.mk
--- a/share/mk/bsd.subdir.mk
+++ b/share/mk/bsd.subdir.mk
@@ -41,7 +41,8 @@
SUBDIR_TARGETS+= \
all all-man analyze buildconfig buildfiles buildincludes \
- checkdpadd clean cleandepend cleandir cleanilinks \
+ checkdpadd check-symbols \
+ clean cleandepend cleandir cleanilinks \
cleanobj depend distribute files includes installconfig \
installdirs \
installfiles installincludes print-dir realinstall \

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