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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/103340] [12 Regression] constexpr std::string is
 incompatible with --enable-libstdcxx-allocator
Date: Sat, 20 Nov 2021 12:19:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103340

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |12.0
      Known to work|                            |11.2.1
           Assignee|unassigned at gcc dot gnu.org      |redi at gcc dot gnu=
.org
             Status|UNCONFIRMED                 |ASSIGNED
            Summary|constexpr std::string is    |[12 Regression] constexpr
                   |incompatible with           |std::string is incompatible
                   |--enable-libstdcxx-allocato |with
                   |r                           |--enable-libstdcxx-allocato
                   |                            |r
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2021-11-20
           Keywords|                            |build
      Known to fail|                            |12.0
           Priority|P3                          |P1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This breaks bootstrap for users who are using a non-default allocator impl.=