From d836db149d439658cb98688f3f5c6ed58446e333 Mon Sep 17 00:00:00 2001 From: Marek Polacek Date: Tue, 30 Jan 2024 17:11:34 -0500 Subject: [PATCH] c++: add deprecation notice for -fconcepts-ts We plan to remove -fconcepts-ts in GCC 15 and thus remove the flag_concepts_ts code. This note is an admonishing reminder to convert the Concepts TS code to C++20 Concepts. gcc/c-family/ChangeLog: * c-opts.cc (c_common_post_options): Add an inform saying that -fconcepts-ts is deprecated and will be removed in GCC 15. gcc/ChangeLog: * doc/invoke.texi: Mention that -fconcepts-ts was deprecated in GCC 14. --- gcc/c-family/c-opts.cc | 5 +++++ gcc/doc/invoke.texi | 4 +++- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/gcc/c-family/c-opts.cc b/gcc/c-family/c-opts.cc index b38a1225ac43..b845aff2226f 100644 --- a/gcc/c-family/c-opts.cc +++ b/gcc/c-family/c-opts.cc @@ -1139,6 +1139,11 @@ c_common_post_options (const char **pfilename) if (cxx_dialect >= cxx20 || flag_concepts_ts) flag_concepts = 1; + /* -fconcepts-ts will be removed in GCC 15. */ + if (flag_concepts_ts) + inform (input_location, "%<-fconcepts-ts%> is deprecated and will be " + "removed in GCC 15; please convert your code to C++20 concepts"); + /* -fimmediate-escalation has no effect when immediate functions are not supported. */ if (flag_immediate_escalation && cxx_dialect < cxx20) diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index eb931b984e8f..ca2c0e90452d 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -3204,7 +3204,9 @@ the language standard, so @option{-fconcepts} defaults to on. Some constructs that were allowed by the earlier C++ Extensions for Concepts Technical Specification, ISO 19217 (2015), but didn't make it into the standard, can additionally be enabled by -@option{-fconcepts-ts}. +@option{-fconcepts-ts}. The option @option{-fconcepts-ts} was deprecated +in GCC 14 and may be removed in GCC 15; users are expected to convert +their code to C++20 concepts. @opindex fconstexpr-depth @item -fconstexpr-depth=@var{n} -- 2.47.2