fix warnings: unused variable 'XX' [-Wunused-variable]

share/qt/extract_strings_qt.py

@@ -54,9 +54,15 @@ child = Popen(['xgettext','--output=-','-n','--keyword=_'] + files, stdout=PIPE)
 messages = parse_po(out) 
 
 f = open(OUT_CPP, 'w')
-f.write('#include <QtGlobal>\n')
-f.write('// Automatically generated by extract_strings.py\n')
-f.write('static const char *bitcoin_strings[] = {')
+f.write("""#include <QtGlobal>
+// Automatically generated by extract_strings.py
+#ifdef __GNUC__
+#define UNUSED __attribute__((unused))
+#else
+#define UNUSED
+#endif
+""")
+f.write('static const char UNUSED *bitcoin_strings[] = {')
 for (msgid, msgstr) in messages:
     if msgid != EMPTY:
         f.write('QT_TRANSLATE_NOOP("bitcoin-core", %s),\n' % ('\n'.join(msgid)))