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From: "michael.kenzel at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/112899] New: odr-using constexpr static data member of
 class exported from module results in linker error
Date: Thu, 07 Dec 2023 10:34:54 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.2.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: michael.kenzel at gmail dot com
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112899

            Bug ID: 112899
           Summary: odr-using constexpr static data member of class
                    exported from module results in linker error
           Product: gcc
           Version: 13.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: michael.kenzel at gmail dot com
  Target Milestone: ---

The following example will reproduce the issue:

    // A.ixx
    export module A;

    export struct A
    {
        static constexpr int blub =3D -1;
    };

    // main.cpp
    import A;

    int main()
    {
        const int& x =3D A::blub;
    }

compile with
    g++ -std=3Dc++23 -fmodules-ts -c -x c++ A.ixx
    g++ -std=3Dc++23 -fmodules-ts main.cpp A.o

results in
    main.cpp:(.text+0x4): undefined reference to `A@A::blub'=