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From: "nilsgladitz at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/100611] New: coroutines: destructor called too many times
 for coroutine lambda stored object
Date: Sat, 15 May 2021 12:28:53 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100611

            Bug ID: 100611
           Summary: coroutines: destructor called too many times for
                    coroutine lambda stored object
           Product: gcc
           Version: 11.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: nilsgladitz at gmail dot com
  Target Milestone: ---

Created attachment 50816
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D50816&action=3Dedit
test case

Given the attached test case compiled and run with e.g.
 g++ test.cpp -std=3Dc++20 -fcoroutines && ./a.out

produces the output:
 Foo(23) 0x55c938eb5ed4
 Foo(const& 23) 0x55c938eb5ee4
 ~Foo(23) 0x55c938eb5ee0
 ~Foo(23) 0x55c938eb5ee4
 ~Foo(23) 0x55c938eb5ed4

Indicating that "Foo" is constructed more often than it gets destructed.

This may be a variation of or related to bug 99576 which my test case is ba=
sed
on.

Bug 99576 seems to be observable in 10.2 while this new issue seems to be
observable in 10.3 and 11.1.

Bisecting the gcc-10 release branch the dividing commit seems to be:
 commit f43a1b1d1718969423337190ddbbbc9037c67783
 Author: Iain Sandoe <iain@sandoe.co.uk>
 Date:   Sun Jul 19 18:39:21 2020 +0100

     coroutines: Correct frame capture of compiler temps [PR95591+4].=