Symbol visibility tests

test_symbols.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# ./test_symbols.sh <library> <expected exported symbols file> <allowed imported symbols file>
+
+diff -u <(sort < "$2") <(nm "$1" | grep " T " | cut -f3 -d " " | sort)
+ec=0
+for symbol in $(nm "$1" | grep " U " | sed 's/ U //') ; do
+    if ! grep --fixed-strings "$symbol" "$3" > /dev/null ; then
+        echo "Imported symbol $symbol not present in $3"
+        ec=1
+    fi
+done
+
+exit $ec