c-common.c (decl_attributes): Allow applying attribute `unused' on a LABEL_DECL.
* c-common.c (decl_attributes): Allow applying attribute `unused' 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'. From-SVN: r24478
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