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For each of the attributes currently included in C2x, it has a constraint that the attribute shall appear at most once in each attribute list (attribute-list being what appear between a single [[ and ]]). This patch implements that check. As the corresponding check in the C++ front end (cp_parser_check_std_attribute) makes violations into errors, I made them into errors, with the same wording, for C as well. There is an existing check in the case of the fallthrough attribute, with a warning rather than an error, in attribute_fallthrough_p. That is more general, as it also covers __attribute__ ((fallthrough)) and the case of [[fallthrough]] [[fallthrough]] (multiple attribute-lists in a single attribute-specifier-sequence), which is not a constraint violation. To avoid some [[fallthrough, fallthrough]] being diagnosed twice, the check I added avoids adding duplicate attributes to the list. Bootstrapped with no regressions on x86_64-pc-linux-gnu. gcc/c: * c-parser.c (c_parser_std_attribute_specifier): Diagnose duplicate standard attributes. gcc/testsuite: * gcc.dg/c2x-attr-deprecated-4.c, gcc.dg/c2x-attr-fallthrough-4.c, gcc.dg/c2x-attr-maybe_unused-4.c: New tests. From-SVN: r278324
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