Add test script for doxygen warnings

tests/scripts/doxygen.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+# Make sure the doxygen documentation builds without warnings
+
+# Abort on errors (and uninitiliased variables)
+set -eu
+
+if [ -d library -a -d include -a -d tests ]; then :; else
+    echo "Must be run from mbed TLS root" >&2
+    exit 1
+fi
+
+if make apidoc > doc.out 2>doc.err; then :; else
+    cat doc.err
+    echo "FAIL" >&2
+    exit 1;
+fi
+
+if grep warning doc.out doc.err; then
+    echo "FAIL" >&2
+    exit 1;
+fi
+
+make apidoc_clean
+rm -f doc.out doc.err