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Subject: [Bug c++/88115] Incorrect result from alignof in templates, if also
 using __alignof__.
Date: Wed, 11 Nov 2020 20:11:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D88115

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppalka@gcc.gnu.org>:

https://gcc.gnu.org/g:b1c9b3c3408c1ec8043f9b9e1a148f84bb7f3b25

commit r11-4926-gb1c9b3c3408c1ec8043f9b9e1a148f84bb7f3b25
Author: Patrick Palka <ppalka@redhat.com>
Date:   Wed Nov 11 15:11:23 2020 -0500

    c++: Change the mangling of __alignof__ [PR88115]

    This patch changes the mangling of __alignof__ to v111__alignof__,
    making its mangling distinct from that of alignof(type) and
    alignof(expr).

    How we mangle ALIGNOF_EXPR now depends on its ALIGNOF_EXPR_STD_P flag,
    which after the previous patch gets consistently set for alignof(type)
    as well as alignof(expr).

    gcc/c-family/ChangeLog:

            PR c++/88115
            * c-opts.c (c_common_post_options): Update latest_abi_version.

    gcc/ChangeLog:

            PR c++/88115
            * common.opt (-fabi-version): Document =3D15.
            * doc/invoke.texi (C++ Dialect Options): Likewise.

    gcc/cp/ChangeLog:

            PR c++/88115
            * mangle.c (write_expression): Mangle __alignof_ differently
            from alignof when the ABI version is at least 15.

    libiberty/ChangeLog:

            PR c++/88115
            * cp-demangle.c (d_print_comp_inner)
            <case DEMANGLE_COMPONENT_EXTENDED_OPERATOR>: Don't print the
            "operator " prefix for __alignof__.
            <case DEMANGLE_COMPONENT_UNARY>: Always print parens around the
            operand of __alignof__.
            * testsuite/demangle-expected: Test demangling for __alignof__.

    gcc/testsuite/ChangeLog:

            PR c++/88115
            * g++.dg/abi/macro0.C: Adjust.
            * g++.dg/cpp0x/alignof7.C: New test.
            * g++.dg/cpp0x/alignof8.C: New test.=