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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/102049] New: Extend attribute deprecated to allow optional
 2nd argument
Date: Tue, 24 Aug 2021 20:48:22 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102049

            Bug ID: 102049
           Summary: Extend attribute deprecated to allow optional 2nd
                    argument
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
  Target Milestone: ---

Clang implements something we don't have:

__attribute__((deprecated("message", "replacement")));

which we reject.  We probably could allow it for the [[gnu::deprecated]]
form too (but not [[deprecated]]).

I wonder if we want some tweak that if the replacement argument is an
empty string, we don't warn -- this should allow code bases to gradually mo=
ve
away from deprecated functions only when there's an actual replacement.

[[gnu::deprecated("insecure", "")]] void f(); // no replacement yet, don't =
warn
[[gnu::deprecated("slow", "add2")]] void add(); // warn, use add2

Does this seem worthwhile?=