https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114458
--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:2f15787f2e1a3afe2c2ad93d4eb0d3c1f73c8fbd commit r15-105-g2f15787f2e1a3afe2c2ad93d4eb0d3c1f73c8fbd Author: Jakub Jelinek <ja...@redhat.com> Date: Thu May 2 09:34:31 2024 +0200 c++: Implement C++26 P2573R2 - = delete("should have a reason"); [PR114458] The following patch implements the C++26 P2573R2 = delete("should have a reason"); paper. I've tried to avoid increasing compile time memory for it when it isn't used (e.g. by adding a new lang_decl tree member), so the reason is represented as STRING_CST in DECL_INITIAL (which normally is for DECL_DELETED_FN error_mark_node) and to differentiate this delete("reason") initializer from some bogus attempt to initialize a function with "reason" using the RID_DELETE identifier as TREE_TYPE of the STRING_CST, as nothing needs to care about the type of the reason. If preferred it could be say TREE_LIST with the reason STRING_CST and RID_DELETE identifier or something similar instead, but that would need more compile time memory when it is used. 2024-05-02 Jakub Jelinek <ja...@redhat.com> PR c++/114458 gcc/c-family/ * c-cppbuiltin.cc (c_cpp_builtins): Predefine __cpp_deleted_function=202403L for C++26. gcc/cp/ChangeLog * parser.cc (cp_parser_pure_specifier): Implement C++26 P2573R2 - = delete("should have a reason");. Parse deleted-function-body. * decl.cc (duplicate_decls): Copy DECL_INITIAL from DECL_DELETED_FN olddecl to newdecl if it is a STRING_CST. (cp_finish_decl): Handle deleted init with a reason. * decl2.cc: Include "escaped_string.h". (grokfield): Handle deleted init with a reason. (mark_used): Emit DECL_DELETED_FN reason in the message if any. * cp-tree.h (DECL_DELETED_FN): Document representation of = delete("reason") on a DECL. gcc/testsuite/ * g++.dg/cpp26/feat-cxx26.C (__cpp_deleted_function): Add test. * g++.dg/cpp26/delete-reason1.C: New test. * g++.dg/cpp26/delete-reason2.C: New test. * g++.dg/parse/error65.C (f1): Adjust expected diagnostics.
