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        on a LABEL_DECL.
        * c-parse.in (label): Parse attributes after a label, and call
        `decl_attributes' to handle them.
        * gansidecl.h (ATTRIBUTE_UNUSED_LABEL): Define.
        * genrecog.c (OUTPUT_LABEL, write_tree_1, write_tree): When
        generating labels, mark them with ATTRIBUTE_UNUSED_LABEL.
        * invoke.texi: Note that labels can be marked `unused'.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@24478 138bc75d-0d04-0410-961f-82ee72b054a4