[Bug inline-asm/98847] Miscompilation with c++17, templates, and register keyword

cvs-commit at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Thu Apr 22 16:50:15 GMT 2021


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98847

--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-8 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:712ffc0ad150aadfa5b91f493075e88fd050189f

commit r8-10878-g712ffc0ad150aadfa5b91f493075e88fd050189f
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Thu Jan 28 16:13:11 2021 +0100

    c++: Fix up handling of register ... asm ("...") vars in templates
[PR33661, PR98847]

    As the testcase shows, for vars appearing in templates, we don't attach
    the asm spec string to the pattern decls, nor pass it back to
cp_finish_decl
    during instantiation.

    The following patch does that.

    2021-01-28  Jakub Jelinek  <jakub@redhat.com>

            PR c++/33661
            PR c++/98847
            * decl.c (cp_finish_decl): For register vars with asmspec in
templates
            call set_user_assembler_name and set DECL_HARD_REGISTER.
            * pt.c (tsubst_expr): When instantiating DECL_HARD_REGISTER vars,
            pass asmspec_tree to cp_finish_decl.

            * g++.dg/opt/pr98847.C: New test.

    (cherry picked from commit cf93f94b3498f3925895fb0bbfd4b64232b9987a)


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