4742dbe718
* c-common.c (c_common_reswords): Add constinit and __constinit. (keyword_is_decl_specifier): Handle RID_CONSTINIT. * c-common.h (enum rid): Add RID_CONSTINIT, RID_FIRST_CXX20, and RID_LAST_CXX20. (D_CXX20): Define. * c-cppbuiltin.c (c_cpp_builtins): Define __cpp_constinit. * c-format.c (cxx_keywords): Add "constinit". * c.opt (Wc++2a-compat, Wc++20-compat): New options. * cp-tree.h (TINFO_VAR_DECLARED_CONSTINIT): Define. (LOOKUP_CONSTINIT): Define. (enum cp_decl_spec): Add ds_constinit. * decl.c (check_tag_decl): Give an error for constinit in type declarations. (check_initializer): Also check LOOKUP_CONSTINIT. (cp_finish_decl): Add checking for a constinit declaration. Set TINFO_VAR_DECLARED_CONSTINIT. (grokdeclarator): Add checking for a declaration with the constinit specifier. * lex.c (init_reswords): Handle D_CXX20. * parser.c (cp_lexer_get_preprocessor_token): Pass a better location to warning_at. Warn about C++20 keywords. (cp_keyword_starts_decl_specifier_p): Handle RID_CONSTINIT. (cp_parser_diagnose_invalid_type_name): Add an inform about constinit. (cp_parser_decomposition_declaration): Maybe pass LOOKUP_CONSTINIT to cp_finish_decl. (cp_parser_decl_specifier_seq): Handle RID_CONSTINIT. (cp_parser_init_declarator): Maybe pass LOOKUP_CONSTINIT to cp_finish_decl. (set_and_check_decl_spec_loc): Add "constinit". * pt.c (tsubst_decl): Set TINFO_VAR_DECLARED_CONSTINIT. (instantiate_decl): Maybe pass LOOKUP_CONSTINIT to cp_finish_decl. * typeck2.c (store_init_value): If a constinit variable wasn't initialized using a constant initializer, give an error. * doc/invoke.texi: Document -Wc++20-compat. * g++.dg/cpp2a/constinit1.C: New test. * g++.dg/cpp2a/constinit2.C: New test. * g++.dg/cpp2a/constinit3.C: New test. * g++.dg/cpp2a/constinit4.C: New test. * g++.dg/cpp2a/constinit5.C: New test. * g++.dg/cpp2a/constinit6.C: New test. * g++.dg/cpp2a/constinit7.C: New test. * g++.dg/cpp2a/constinit8.C: New test. * g++.dg/cpp2a/constinit9.C: New test. * g++.dg/cpp2a/constinit10.C: New test. * g++.dg/cpp2a/constinit11.C: New test. * g++.dg/cpp2a/constinit12.C: New test. From-SVN: r275008
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