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./: * doc/extend.texi (Attribute Syntax): Document that C++ labels on empty statements can now have attributes. cp/: * parser.c (cp_parser_label_for_labeled_statement): Support attribute on labels if immediately followed by semicolon. * semantics.c (finish_label_stmt): Return new label. * pt.c (tsubst_expr): Handle attributes for LABEL_EXPR. testsuite/: * gcc.dg/Wunused-label-1.c: New test case. * g++.dg/warn/Wunused-label-1.C: New test case. * g++.dg/warn/Wunused-label-2.C: New test case. * g++.dg/warn/Wunused-label-3.C: New test case. From-SVN: r148242
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