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Subject: [Bug c++/99066] [9/10 Regression] non-weak definition emitted for
 explicit instantiation declaration
Date: Fri, 13 May 2022 17:14:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99066

--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Jason Merrill
<jason@gcc.gnu.org>:

https://gcc.gnu.org/g:20b503f1125c0b0a7f4b2bb1214d4a3cc6fd9f70

commit r10-10735-g20b503f1125c0b0a7f4b2bb1214d4a3cc6fd9f70
Author: Jason Merrill <jason@redhat.com>
Date:   Sun Apr 4 23:32:32 2021 -0400

    c++: extern template and static data member [PR99066]

    'extern template' should mean that the relevant symbols are never emitt=
ed.
    But in this case we were assuming that DECL_EXTERNAL was already set on=
 the
    variable, so we just needed to clear DECL_NOT_REALLY_EXTERN.  Since
    DECL_EXTERNAL was not set, we emitted a definition of npos.

    gcc/cp/ChangeLog:

            PR c++/99066
            * pt.c (mark_decl_instantiated): Set DECL_EXTERNAL.

    gcc/testsuite/ChangeLog:

            PR c++/99066
            * g++.dg/cpp0x/extern_template-6.C: New test.=