Mk: add a new HAS_SYMBOL_VERSION

When a port is tagged with this (should contain the list of libraries
with SYMBOL version) the ports tree will add an extra check that
the built library actually have symbols versions.

Mk/Scripts/check_have_symbols.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+
+set -eu
+set -o pipefail
+
+# the 3 implementations of readelf we can use have different output, but they all have a similarity
+# for the .gnu.version_d section they all have the symbol version in last element of their output
+# and have "Name:" or "vda_name": in the 10th position, no other section displayed have this
+# it means that if there are no symbols exported then nothing matches this search pattern.
+
+STAGEDIR=$1
+shift
+ret=0
+failed=""
+for lib; do
+	if ! /usr/bin/readelf -V ${STAGEDIR}$lib  | awk 'BEGIN { ret=1 } $10 == "Name:" || $10 == "vda_name:" { ret=0; exit 0 } END { exit ret }'; then
+		ret=1
+		failed="${failed} ${lib}"
+	fi
+done
+if [ "$failed" != "" ]; then
+	echo "the following libraries are supposed to have symbols versioning but they don't" >&2
+	for l in ${failed}; do
+		echo "- $l" >&2
+	done
+fi
+exit $ret

Mk/bsd.port.mk

@@ -5394,6 +5394,12 @@ show-dev-errors:
 .      endif
 .    endif #DEVELOPER
 
+.    if defined(HAS_SYMBOL_VERSION)
+stage-sanity: check_has_symbol_version
+check_has_symbol_version:
+		${SH} ${SCRIPTSDIR}/check_have_symbols.sh ${STAGEDIR} ${HAS_SYMBOL_VERSION}
+.    endif # HAS_SYMBOL_VERSION
+
 ${_PORTS_DIRECTORIES}:
 	@${MKDIR} ${.TARGET}
 
@@ -5465,7 +5471,8 @@ _STAGE_SEQ=		050:stage-message 100:stage-dir 150:run-depends \
 				900:add-plist-info 910:add-plist-docs 920:add-plist-examples \
 				930:add-plist-data 940:add-plist-post ${POST_PLIST:C/^/990:/} \
 				${_OPTIONS_install} ${_USES_install} \
-				${_OPTIONS_stage} ${_USES_stage} ${_FEATURES_stage}
+				${_OPTIONS_stage} ${_USES_stage} ${_FEATURES_stage} \
+				994:stage-sanity
 .    if defined(DEVELOPER)
 _STAGE_SEQ+=	995:stage-qa
 .    else

x11/libxkbcommon/Makefile

@@ -25,6 +25,8 @@ CPE_VENDOR=	xkbcommon
 SHEBANG_FILES=	test/xkeyboard-config-test.py.in \
 		test/*.py
 
+HAS_SYMBOL_VERSION=	${PREFIX}/lib/libxkbregistry.so.0.8.1
+
 OPTIONS_DEFINE=	EVDEV WAYLAND X11
 OPTIONS_DEFAULT=EVDEV WAYLAND X11
 OPTIONS_SUB=	yes