[Bug c++/115987] False "possibly dangling reference" false positive when having an extra template parameter

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115987

--- Comment #24 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-14 branch has been updated by Jason Merrill
<ja...@gcc.gnu.org>:

https://gcc.gnu.org/g:7232bc180632f0ccce260bd33598faf6297d4fe6

commit r14-10726-g7232bc180632f0ccce260bd33598faf6297d4fe6
Author: Marek Polacek <pola...@redhat.com>
Date:   Wed Jul 31 17:33:55 2024 -0400

    c++: fix -Wdangling-reference false positive [PR115987]

    This fixes another false positive.  When a function is taking a
    temporary of scalar type that couldn't be bound to the return type
    of the function, don't warn, such a program would be ill-formed.

    Thanks to Jonathan for reporting the problem.

            PR c++/115987

    gcc/cp/ChangeLog:

            * call.cc (do_warn_dangling_reference): Don't consider a
            temporary with a scalar type that cannot bind to the return type.

    gcc/testsuite/ChangeLog:

            * g++.dg/ext/attr-no-dangling6.C: Adjust.
            * g++.dg/ext/attr-no-dangling7.C: Likewise.
            * g++.dg/warn/Wdangling-reference22.C: New test.