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C2x adds the nodiscard standard attribute, with an optional string argument, as in C++; implement it for C. Bootstrapped with no regressions for x86_64-pc-linux-gnu. gcc/c/ 2020-11-04 Joseph Myers <joseph@codesourcery.com> * c-decl.c (handle_nodiscard_attribute): New. (std_attribute_table): Add nodiscard. * c-parser.c (c_parser_std_attribute): Expect argument to nodiscard attribute to be a string. Do not special-case ignoring nodiscard. * c-typeck.c (maybe_warn_nodiscard): New. (build_compound_expr, emit_side_effect_warnings): Call maybe_warn_nodiscard. (c_process_expr_stmt, c_finish_stmt_expr): Also call emit_side_effect_warnings if warn_unused_result. gcc/testsuite/ 2020-11-04 Joseph Myers <joseph@codesourcery.com> * gcc.dg/c2x-attr-nodiscard-1.c, gcc.dg/c2x-attr-nodiscard-2.c, gcc.dg/c2x-attr-nodiscard-3.c, gcc.dg/c2x-attr-nodiscard-4.c: New tests. * gcc.dg/c2x-attr-syntax-5.c: Remove nodiscard test.
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