[Bug c++/126606] [17 Regression] gcc-17 fails to build qt-6.11.1: qfutureinterface_p.h:150:25: error: call to 'QFutureInterfaceBasePrivate::RefCount::RefCount(int, int)' uses the default argument for parameter 2, which is not yet defined since r17-2718-ge3e1c72649c3

"cvs-commit at gcc dot gnu.org via Gcc-bugs" <[email protected]> Mon, 03 Aug 2026 21:56:22 +0000

Newsgroups	gmane.comp.gcc.bugs
Message-ID	<[email protected]/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D126606

--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Jason Merrill <[email protected]>:

https://gcc.gnu.org/g:4569067c6f5206e97a319ec6bfa4e3446b3a41d1

commit r17-2912-g4569067c6f5206e97a319ec6bfa4e3446b3a41d1
Author: Jason Merrill <[email protected]>
Date:   Sat Aug 1 00:17:45 2026 -0400

    c++: early DMI and constructor default arg [PR126606]

    This testcase demonstrates that the issue in 126481 was not the {} but
    the member of class type.

            PR c++/126606
            PR c++/126481

    gcc/cp/ChangeLog:

            * parser.cc (cp_parser_early_parsing_nsdmi): Check
            MAYBE_CLASS_TYPE_P instead of {}.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp0x/nsdmi-defer9.C: New test.=